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{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_27dd2a94e65a427581b05c5b","type":"tool_result","content":"1\t//! Bead-Id commit trailer injection.\n2\t//!\n3\t//! When a bead closes with a commit artifact (i.e. the agent made commits),\n4\t//! NEEDLE amends the latest commit to include a `Bead-Id: <id>` trailer.\n5\t//! HOOP's bead_commit_index then picks this up via `git log`.\n6\t\n7\tuse std::path::Path;\n8\t\n9\tuse anyhow::Result;\n10\tuse tokio::process::Command;\n11\t\n12\tuse crate::types::BeadId;\n13\t\n14\t// ---------------------------------------------------------------------------\n15\t// Public entry point\n16\t// ---------------------------------------------------------------------------\n17\t\n18\t/// Inject a `Bead-Id: <id>` trailer into the latest commit in `workspace`.\n19\t///\n20\t/// Only acts when HEAD moved since `pre_dispatch_head` (i.e. the agent made\n21\t/// at least one commit). Returns `Ok(())` in all no-op cases (not a git repo,\n22\t/// no new commits, trailer already present). Errors are logged by callers as\n23\t/// non-fatal warnings.\n24\tpub async fn inject_bead_id_trailer(\n25\t    workspace: &Path,\n26\t    bead_id: &BeadId,\n27\t    pre_dispatch_head: &str,\n28\t) -> Result<()> {\n29\t    let ws = workspace.to_str().unwrap_or(\".\").to_string();\n30\t\n31\t    // Get current HEAD — if it fails, workspace is not a git repo.\n32\t    let current_head = match git_head(&ws).await {\n33\t        Ok(h) => h,\n34\t        Err(_) => return Ok(()),\n35\t    };\n36\t\n37\t    // No new commits → nothing to tag.\n38\t    if current_head == pre_dispatch_head {\n39\t        return Ok(());\n40\t    }\n41\t\n42\t    // Check if the trailer is already present (idempotent).\n43\t    if already_has_trailer(&ws, bead_id).await? {\n44\t        return Ok(());\n45\t    }\n46\t\n47\t    // Amend the latest commit to add the Bead-Id trailer.\n48\t    // Wrapped in a 30-second timeout to prevent indefinite hangs if git\n49\t    // subprocess hangs (e.g., due to filesystem issues or network mounts).\n50\t    let trailer_arg = format!(\"Bead-Id: {}\", bead_id);\n51\t    let out = tokio::time::timeout(\n52\t        std::time::Duration::from_secs(30),\n53\t        Command::new(\"git\")\n54\t            .args([\n55\t                \"-C\",\n56\t                &ws,\n57\t                \"commit\",\n58\t                \"--amend\",\n59\t                \"--no-edit\",\n60\t                \"--trailer\",\n61\t                &trailer_arg,\n62\t            ])\n63\t            .output(),\n64\t    )\n65\t    .await\n66\t    .map_err(|_| anyhow::anyhow!(\"git commit --amend timed out after 30s in {}\", ws))??;\n67\t\n68\t    if !out.status.success() {\n69\t        let stderr = String::from_utf8_lossy(&out.stderr);\n70\t        anyhow::bail!(\"git commit --amend failed: {}\", stderr.trim());\n71\t    }\n72\t\n73\t    tracing::info!(\n74\t        bead_id = %bead_id,\n75\t        workspace = %ws,\n76\t        \"injected Bead-Id trailer into latest commit\"\n77\t    );\n78\t\n79\t    Ok(())\n80\t}\n81\t\n82\t// ---------------------------------------------------------------------------\n83\t// Helpers\n84\t// ---------------------------------------------------------------------------\n85\t\n86\t/// Return the current HEAD SHA for `workspace`.\n87\t///\n88\t/// Wrapped in a 10-second timeout to prevent indefinite hangs if git\n89\t/// subprocess hangs (e.g., due to filesystem issues or network mounts).\n90\tpub(crate) async fn git_head(workspace: &str) -> Result<String> {\n91\t    let out = tokio::time::timeout(\n92\t        std::time::Duration::from_secs(10),\n93\t        Command::new(\"git\")\n94\t            .args([\"-C\", workspace, \"rev-parse\", \"HEAD\"])\n95\t            .output(),\n96\t    )\n97\t    .await\n98\t    .map_err(|_| anyhow::anyhow!(\"git rev-parse HEAD timed out after 10s in {}\", workspace))??;\n99\t\n100\t    if !out.status.success() {\n101\t        anyhow::bail!(\"git rev-parse HEAD failed in {}\", workspace);\n102\t    }\n103\t    Ok(String::from_utf8(out.stdout)?.trim().to_string())\n104\t}\n105\t\n106\t/// Check whether the latest commit already carries `Bead-Id: <bead_id>`.\n107\t///\n108\t/// Wrapped in a 10-second timeout to prevent indefinite hangs if git\n109\t/// subprocess hangs (e.g., due to filesystem issues or network mounts).\n110\tasync fn already_has_trailer(workspace: &str, bead_id: &BeadId) -> Result<bool> {\n111\t    let out = tokio::time::timeout(\n112\t        std::time::Duration::from_secs(10),\n113\t        Command::new(\"git\")\n114\t            .args([\n115\t                \"-C\",\n116\t                workspace,\n117\t                \"log\",\n118\t                \"-1\",\n119\t                \"--format=%(trailers:key=Bead-Id,valueonly,separator=,)\",\n120\t            ])\n121\t            .output(),\n122\t    )\n123\t    .await\n124\t    .map_err(|_| anyhow::anyhow!(\"git log timed out after 10s in {}\", workspace))??;\n125\t\n126\t    if !out.status.success() {\n127\t        return Ok(false);\n128\t    }\n129\t\n130\t    let text = String::from_utf8_lossy(&out.stdout);\n131\t    Ok(text.split(',').any(|v| v.trim() == bead_id.as_ref()))\n132\t}\n133\t\n134\t// ---------------------------------------------------------------------------\n135\t// Tests\n136\t// ---------------------------------------------------------------------------\n137\t\n138\t#[cfg(test)]\n139\tmod tests {\n140\t\n141\t    #[test]\n142\t    fn already_has_trailer_logic() {\n143\t        // Simulate what `already_has_trailer` checks: split on ',' and compare.\n144\t        let output = \"hoop-ttb.3.34,hoop-ttb.3.35\\n\";\n145\t        let bead_id = \"hoop-ttb.3.34\";\n146\t        let found = output.split(',').any(|v| v.trim() == bead_id);\n147\t        assert!(found);\n148\t\n149\t        let bead_id_missing = \"hoop-ttb.9.99\";\n150\t        let not_found = output.split(',').any(|v| v.trim() == bead_id_missing);\n151\t        assert!(!not_found);\n152\t    }\n153\t\n154\t    #[test]\n155\t    fn empty_head_means_no_op() {\n156\t        // pre_dispatch_head \"\" is treated as unknown; HEAD would differ → would\n157\t        // inject. This test documents that the caller should use \"\" only when\n158\t        // the workspace has no commits (git_head returns Err, which we short-circuit).\n159\t        // The actual guard is: if current_head == pre_dispatch_head → skip.\n160\t        let pre = \"abc123\";\n161\t        let current = \"abc123\";\n162\t        assert_eq!(pre, current); // no-op condition\n163\t    }\n164\t}\n165\t"}]},"parent_tool_use_id":null,"session_id":"72539a33-4a3d-4268-95e8-c3da33ecc3f7","uuid":"18fb1d00-4caa-4a8f-aee4-02d0fdcc1178","timestamp":"2026-05-30T15:27:51.291Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/NEEDLE/src/commit_hook.rs","content":"//! Bead-Id commit trailer injection.\n//!\n//! When a bead closes with a commit artifact (i.e. the agent made commits),\n//! NEEDLE amends the latest commit to include a `Bead-Id: <id>` trailer.\n//! HOOP's bead_commit_index then picks this up via `git log`.\n\nuse std::path::Path;\n\nuse anyhow::Result;\nuse tokio::process::Command;\n\nuse crate::types::BeadId;\n\n// ---------------------------------------------------------------------------\n// Public entry point\n// ---------------------------------------------------------------------------\n\n/// Inject a `Bead-Id: <id>` trailer into the latest commit in `workspace`.\n///\n/// Only acts when HEAD moved since `pre_dispatch_head` (i.e. the agent made\n/// at least one commit). Returns `Ok(())` in all no-op cases (not a git repo,\n/// no new commits, trailer already present). Errors are logged by callers as\n/// non-fatal warnings.\npub async fn inject_bead_id_trailer(\n    workspace: &Path,\n    bead_id: &BeadId,\n    pre_dispatch_head: &str,\n) -> Result<()> {\n    let ws = workspace.to_str().unwrap_or(\".\").to_string();\n\n    // Get current HEAD — if it fails, workspace is not a git repo.\n    let current_head = match git_head(&ws).await {\n        Ok(h) => h,\n        Err(_) => return Ok(()),\n    };\n\n    // No new commits → nothing to tag.\n    if current_head == pre_dispatch_head {\n        return Ok(());\n    }\n\n    // Check if the trailer is already present (idempotent).\n    if already_has_trailer(&ws, bead_id).await? {\n        return Ok(());\n    }\n\n    // Amend the latest commit to add the Bead-Id trailer.\n    // Wrapped in a 30-second timeout to prevent indefinite hangs if git\n    // subprocess hangs (e.g., due to filesystem issues or network mounts).\n    let trailer_arg = format!(\"Bead-Id: {}\", bead_id);\n    let out = tokio::time::timeout(\n        std::time::Duration::from_secs(30),\n        Command::new(\"git\")\n            .args([\n                \"-C\",\n                &ws,\n                \"commit\",\n                \"--amend\",\n                \"--no-edit\",\n                \"--trailer\",\n                &trailer_arg,\n            ])\n            .output(),\n    )\n    .await\n    .map_err(|_| anyhow::anyhow!(\"git commit --amend timed out after 30s in {}\", ws))??;\n\n    if !out.status.success() {\n        let stderr = String::from_utf8_lossy(&out.stderr);\n        anyhow::bail!(\"git commit --amend failed: {}\", stderr.trim());\n    }\n\n    tracing::info!(\n        bead_id = %bead_id,\n        workspace = %ws,\n        \"injected Bead-Id trailer into latest commit\"\n    );\n\n    Ok(())\n}\n\n// ---------------------------------------------------------------------------\n// Helpers\n// ---------------------------------------------------------------------------\n\n/// Return the current HEAD SHA for `workspace`.\n///\n/// Wrapped in a 10-second timeout to prevent indefinite hangs if git\n/// subprocess hangs (e.g., due to filesystem issues or network mounts).\npub(crate) async fn git_head(workspace: &str) -> Result<String> {\n    let out = tokio::time::timeout(\n        std::time::Duration::from_secs(10),\n        Command::new(\"git\")\n            .args([\"-C\", workspace, \"rev-parse\", \"HEAD\"])\n            .output(),\n    )\n    .await\n    .map_err(|_| anyhow::anyhow!(\"git rev-parse HEAD timed out after 10s in {}\", workspace))??;\n\n    if !out.status.success() {\n        anyhow::bail!(\"git rev-parse HEAD failed in {}\", workspace);\n    }\n    Ok(String::from_utf8(out.stdout)?.trim().to_string())\n}\n\n/// Check whether the latest commit already carries `Bead-Id: <bead_id>`.\n///\n/// Wrapped in a 10-second timeout to prevent indefinite hangs if git\n/// subprocess hangs (e.g., due to filesystem issues or network mounts).\nasync fn already_has_trailer(workspace: &str, bead_id: &BeadId) -> Result<bool> {\n    let out = tokio::time::timeout(\n        std::time::Duration::from_secs(10),\n        Command::new(\"git\")\n            .args([\n                \"-C\",\n                workspace,\n                \"log\",\n                \"-1\",\n                \"--format=%(trailers:key=Bead-Id,valueonly,separator=,)\",\n            ])\n            .output(),\n    )\n    .await\n    .map_err(|_| anyhow::anyhow!(\"git log timed out after 10s in {}\", workspace))??;\n\n    if !out.status.success() {\n        return Ok(false);\n    }\n\n    let text = String::from_utf8_lossy(&out.stdout);\n    Ok(text.split(',').any(|v| v.trim() == bead_id.as_ref()))\n}\n\n// ---------------------------------------------------------------------------\n// Tests\n// ---------------------------------------------------------------------------\n\n#[cfg(test)]\nmod tests {\n\n    #[test]\n    fn already_has_trailer_logic() {\n        // Simulate what `already_has_trailer` checks: split on ',' and compare.\n        let output = \"hoop-ttb.3.34,hoop-ttb.3.35\\n\";\n        let bead_id = \"hoop-ttb.3.34\";\n        let found = output.split(',').any(|v| v.trim() == bead_id);\n        assert!(found);\n\n        let bead_id_missing = \"hoop-ttb.9.99\";\n        let not_found = output.split(',').any(|v| v.trim() == bead_id_missing);\n        assert!(!not_found);\n    }\n\n    #[test]\n    fn empty_head_means_no_op() {\n        // pre_dispatch_head \"\" is treated as unknown; HEAD would differ → would\n        // inject. This test documents that the caller should use \"\" only when\n        // the workspace has no commits (git_head returns Err, which we short-circuit).\n        // The actual guard is: if current_head == pre_dispatch_head → skip.\n        let pre = \"abc123\";\n        let current = \"abc123\";\n        assert_eq!(pre, current); // no-op condition\n    }\n}\n","numLines":165,"startLine":1,"totalLines":165}}}
{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_cd37da30a40842b6b6fc4e76","type":"tool_result","content":"1\t//! Splice strand: worker failure documentation.\n2\t//!\n3\t//! Strand 8 in the waterfall (runs before Knot). Scans heartbeat files for\n4\t//! workers with stale heartbeats whose tmux session is dead, and creates a\n5\t//! failure bead in the configured report workspace for each undocumented failure.\n6\t//!\n7\t//! Also detects live-but-looping workers: workers with fresh heartbeats that are\n8\t//! stuck in tight event loops (claim churn, state ping-pong, log runaway).\n9\t//!\n10\t//! Entry conditions:\n11\t//! - `strands.splice.enabled` is true (default: true)\n12\t//! - Heartbeat files exist in the heartbeat directory\n13\t//! - At least one worker has a stale heartbeat and dead tmux session OR\n14\t//!   a live worker exhibits loop patterns in its JSONL tail\n15\t//!\n16\t//! State persistence:\n17\t//! - `splice_state.json` tracks which session IDs have already been documented\n18\t//! - Prevents duplicate failure beads for the same dead/looping worker\n19\t\n20\tuse std::collections::{HashMap, HashSet};\n21\tuse std::path::{Path, PathBuf};\n22\t\n23\tuse anyhow::{Context, Result};\n24\tuse chrono::{DateTime, Utc};\n25\tuse serde::{Deserialize, Serialize};\n26\t\n27\tuse crate::bead_store::{BeadStore, BrCliBeadStore};\n28\tuse crate::config::SpliceConfig;\n29\tuse crate::telemetry::Telemetry;\n30\tuse crate::types::StrandResult;\n31\t\n32\t// ──────────────────────────────────────────────────────────────────────────────\n33\t// TelemetryEventLike (minimal subset for JSONL scanning)\n34\t// ──────────────────────────────────────────────────────────────────────────────\n35\t\n36\t/// Minimal telemetry event representation for JSONL tail scanning.\n37\t#[derive(Debug, Deserialize)]\n38\tstruct TelemetryEventLike {\n39\t    timestamp: DateTime<Utc>,\n40\t    event_type: String,\n41\t    #[serde(default)]\n42\t    bead_id: Option<String>,\n43\t    #[serde(default)]\n44\t    data: serde_json::Value,\n45\t}\n46\t\n47\t// ──────────────────────────────────────────────────────────────────────────────\n48\t// Loop detection result structures\n49\t// ──────────────────────────────────────────────────────────────────────────────\n50\t\n51\t#[derive(Debug)]\n52\tstruct ClaimChurnInfo {\n53\t    bead_id: String,\n54\t    count: u32,\n55\t    sample: Vec<String>,\n56\t}\n57\t\n58\t#[derive(Debug)]\n59\tstruct StatePingPongInfo {\n60\t    states: Vec<String>,\n61\t    cycle_count: u32,\n62\t    sample: Vec<String>,\n63\t}\n64\t\n65\t#[derive(Debug)]\n66\tstruct LogRunawayInfo {\n67\t    bytes_growth: u64,\n68\t    window_secs: u64,\n69\t    sample: Vec<String>,\n70\t}\n71\t\n72\t// ──────────────────────────────────────────────────────────────────────────────\n73\t// HeartbeatRecord\n74\t// ──────────────────────────────────────────────────────────────────────────────\n75\t\n76\t/// Heartbeat record deserialized from a worker's heartbeat file.\n77\t#[derive(Debug, Deserialize, Clone)]\n78\tstruct HeartbeatRecord {\n79\t    worker_id: String,\n80\t    pid: u32,\n81\t    #[serde(default)]\n82\t    state: String,\n83\t    #[serde(default)]\n84\t    current_bead: Option<String>,\n85\t    workspace: String,\n86\t    last_heartbeat: DateTime<Utc>,\n87\t    session: String,\n88\t    #[serde(default)]\n89\t    beads_processed: u64,\n90\t}\n91\t\n92\t// ──────────────────────────────────────────────────────────────────────────────\n93\t// Loop detection types\n94\t// ──────────────────────────────────────────────────────────────────────────────\n95\t\n96\t/// Type of live-loop pattern detected.\n97\t#[derive(Debug, Clone)]\n98\tenum LoopType {\n99\t    /// Repeated claim.race_lost events for the same bead.\n100\t    ClaimChurn { bead_id: String, count: u32 },\n101\t    /// Excessive JSONL growth without forward progress.\n102\t    LogRunaway { bytes_growth: u64, window_secs: u64 },\n103\t    /// State ping-pong between a small set of states.\n104\t    StatePingPong {\n105\t        states: Vec<String>,\n106\t        cycle_count: u32,\n107\t    },\n108\t}\n109\t\n110\t/// Evidence collected for a loop detection.\n111\t#[derive(Debug, Clone)]\n112\tstruct LoopEvidence {\n113\t    /// Number of events scanned from JSONL tail.\n114\t    events_scanned: usize,\n115\t    /// Sample of recent events showing the pattern.\n116\t    sample_events: Vec<String>,\n117\t    /// When the loop was detected.\n118\t    detected_at: DateTime<Utc>,\n119\t}\n120\t\n121\t/// A worker exhibiting a live-loop pattern.\n122\t#[derive(Debug, Clone)]\n123\tstruct LiveLoopWorker {\n124\t    /// The worker's heartbeat record.\n125\t    heartbeat: HeartbeatRecord,\n126\t    /// The type of loop detected.\n127\t    loop_type: LoopType,\n128\t    /// Evidence supporting the detection.\n129\t    evidence: LoopEvidence,\n130\t}\n131\t\n132\t// ──────────────────────────────────────────────────────────────────────────────\n133\t// SpliceState\n134\t// ──────────────────────────────────────────────────────────────────────────────\n135\t\n136\t/// Persisted state for the Splice strand.\n137\t#[derive(Debug, Default, Serialize, Deserialize)]\n138\tstruct SpliceState {\n139\t    /// Session IDs that have already had a failure bead created (dead workers).\n140\t    documented_sessions: HashSet<String>,\n141\t    /// (worker_id, session_id, pattern_name) tuples already documented (live loops).\n142\t    documented_loops: HashSet<String>,\n143\t}\n144\t\n145\timpl SpliceState {\n146\t    /// Load state from the state directory, returning None if file doesn't exist.\n147\t    fn load(state_dir: &Path) -> Result<Option<Self>> {\n148\t        let path = state_dir.join(\"splice_state.json\");\n149\t        if !path.exists() {\n150\t            return Ok(None);\n151\t        }\n152\t        let content = std::fs::read_to_string(&path)\n153\t            .with_context(|| format!(\"failed to read splice state: {}\", path.display()))?;\n154\t        let state: SpliceState =\n155\t            serde_json::from_str(&content).with_context(|| \"failed to parse splice state\")?;\n156\t        Ok(Some(state))\n157\t    }\n158\t\n159\t    /// Save state to the state directory.\n160\t    fn save(&self, state_dir: &Path) -> Result<()> {\n161\t        std::fs::create_dir_all(state_dir)\n162\t            .with_context(|| format!(\"failed to create state dir: {}\", state_dir.display()))?;\n163\t        let path = state_dir.join(\"splice_state.json\");\n164\t        let content = serde_json::to_string_pretty(self)?;\n165\t        std::fs::write(&path, content)\n166\t            .with_context(|| format!(\"failed to write splice state: {}\", path.display()))?;\n167\t        Ok(())\n168\t    }\n169\t}\n170\t\n171\t// ──────────────────────────────────────────────────────────────────────────────\n172\t// SpliceStrand\n173\t// ──────────────────────────────────────────────────────────────────────────────\n174\t\n175\t/// The Splice strand — worker failure documentation.\n176\t///\n177\t/// Scans heartbeat files for dead workers and creates failure beads.\n178\tpub struct SpliceStrand {\n179\t    config: SpliceConfig,\n180\t    heartbeat_dir: PathBuf,\n181\t    state_dir: PathBuf,\n182\t    #[allow(dead_code)]\n183\t    telemetry: Telemetry,\n184\t}\n185\t\n186\timpl SpliceStrand {\n187\t    /// Create a new SpliceStrand.\n188\t    ///\n189\t    /// - `config`: splice strand configuration\n190\t    /// - `heartbeat_dir`: directory containing worker heartbeat JSON files\n191\t    /// - `state_dir`: directory for persisting splice state\n192\t    /// - `telemetry`: telemetry emitter\n193\t    pub fn new(\n194\t        config: SpliceConfig,\n195\t        heartbeat_dir: PathBuf,\n196\t        state_dir: PathBuf,\n197\t        telemetry: Telemetry,\n198\t    ) -> Self {\n199\t        SpliceStrand {\n200\t            config,\n201\t            heartbeat_dir,\n202\t            state_dir,\n203\t            telemetry,\n204\t        }\n205\t    }\n206\t\n207\t    /// Derive the JSONL log path for a worker's session.\n208\t    ///\n209\t    /// Format: `<log_dir>/<worker_id>-<session_id>.jsonl`\n210\t    fn worker_log_path(&self, worker_id: &str, session_id: &str) -> Option<PathBuf> {\n211\t        // Try to get log_dir from the heartbeat record's workspace.\n212\t        // Default to ~/.needle/logs if not configured.\n213\t        let log_dir =\n214\t            std::env::var_os(\"HOME\").map(|h| PathBuf::from(h).join(\".needle\").join(\"logs\"))?;\n215\t\n216\t        Some(log_dir.join(format!(\"{}-{}.jsonl\", worker_id, session_id)))\n217\t    }\n218\t\n219\t    /// Read the last N events from a JSONL file.\n220\t    ///\n221\t    /// Returns lines in reverse order (newest first), limited to scan_events.\n222\t    fn read_jsonl_tail(&self, path: &Path, scan_events: usize) -> Result<Vec<String>> {\n223\t        let content = std::fs::read_to_string(path)\n224\t            .with_context(|| format!(\"failed to read jsonl: {}\", path.display()))?;\n225\t\n226\t        let lines: Vec<&str> = content.lines().collect();\n227\t        let tail_len = scan_events.min(lines.len());\n228\t        let mut tail = Vec::with_capacity(tail_len);\n229\t\n230\t        for line in lines.iter().rev().take(tail_len) {\n231\t            tail.push(line.to_string());\n232\t        }\n233\t\n234\t        Ok(tail)\n235\t    }\n236\t\n237\t    /// Scan live workers for loop patterns.\n238\t    ///\n239\t    /// Returns workers with fresh heartbeats that exhibit stuck-loop behavior.\n240\t    fn scan_live_loops(&self) -> Result<Vec<LiveLoopWorker>> {\n241\t        let mut looping = Vec::new();\n242\t\n243\t        if !self.config.detect_live_loops {\n244\t            return Ok(looping);\n245\t        }\n246\t\n247\t        let entries = match std::fs::read_dir(&self.heartbeat_dir) {\n248\t            Ok(e) => e,\n249\t            Err(e) if e.kind() == std::io::ErrorKind::NotFound => {\n250\t                tracing::debug!(\"splice: heartbeat directory does not exist\");\n251\t                return Ok(Vec::new());\n252\t            }\n253\t            Err(e) => {\n254\t                return Err(e).context(\"failed to read heartbeat directory\");\n255\t            }\n256\t        };\n257\t\n258\t        for entry in entries {\n259\t            let entry = match entry {\n260\t                Ok(e) => e,\n261\t                Err(_) => continue,\n262\t            };\n263\t\n264\t            let path = entry.path();\n265\t            if path.extension().and_then(|s| s.to_str()) != Some(\"json\") {\n266\t                continue;\n267\t            }\n268\t\n269\t            // Parse the heartbeat file.\n270\t            let content = match std::fs::read_to_string(&path) {\n271\t                Ok(c) => c,\n272\t                Err(_) => continue,\n273\t            };\n274\t\n275\t            let record: HeartbeatRecord = match serde_json::from_str(&content) {\n276\t                Ok(r) => r,\n277\t                Err(_) => continue,\n278\t            };\n279\t\n280\t            // Skip stale heartbeats — those are handled by scan_failed_workers.\n281\t            let elapsed = Utc::now() - record.last_heartbeat;\n282\t            let stale_threshold_secs = self.config.stale_threshold_secs as i64;\n283\t            if elapsed.num_seconds() >= stale_threshold_secs {\n284\t                continue;\n285\t            }\n286\t\n287\t            // Check for loop patterns in the JSONL tail.\n288\t            let log_path = match self.worker_log_path(&record.worker_id, &record.session) {\n289\t                Some(p) => p,\n290\t                None => continue,\n291\t            };\n292\t\n293\t            if !log_path.exists() {\n294\t                continue;\n295\t            }\n296\t\n297\t            if let Some(loop_worker) = self.check_worker_for_loops(&record, &log_path)? {\n298\t                looping.push(loop_worker);\n299\t            }\n300\t        }\n301\t\n302\t        Ok(looping)\n303\t    }\n304\t\n305\t    /// Check a single worker's JSONL for loop patterns.\n306\t    ///\n307\t    /// Returns Some(LiveLoopWorker) if a pattern is detected, None otherwise.\n308\t    fn check_worker_for_loops(\n309\t        &self,\n310\t        record: &HeartbeatRecord,\n311\t        log_path: &Path,\n312\t    ) -> Result<Option<LiveLoopWorker>> {\n313\t        let tail_events = self.read_jsonl_tail(log_path, self.config.live_loop_scan_events)?;\n314\t\n315\t        // Parse events into structured form for analysis.\n316\t        let mut events: Vec<TelemetryEventLike> = Vec::new();\n317\t        for line in &tail_events {\n318\t            if let Ok(ev) = serde_json::from_str::<TelemetryEventLike>(line) {\n319\t                events.push(ev);\n320\t            }\n321\t        }\n322\t\n323\t        let detected_at = Utc::now();\n324\t\n325\t        // Pattern 1: Claim churn — repeated race_lost for same bead.\n326\t        if let Some(churn) = self.detect_claim_churn(&events) {\n327\t            return Ok(Some(LiveLoopWorker {\n328\t                heartbeat: record.clone(),\n329\t                loop_type: LoopType::ClaimChurn {\n330\t                    bead_id: churn.bead_id,\n331\t                    count: churn.count,\n332\t                },\n333\t                evidence: LoopEvidence {\n334\t                    events_scanned: tail_events.len(),\n335\t                    sample_events: churn.sample,\n336\t                    detected_at,\n337\t                },\n338\t            }));\n339\t        }\n340\t\n341\t        // Pattern 2: State ping-pong — short cycle without forward progress.\n342\t        if let Some(pingpong) = self.detect_state_ping_pong(&events) {\n343\t            return Ok(Some(LiveLoopWorker {\n344\t                heartbeat: record.clone(),\n345\t                loop_type: LoopType::StatePingPong {\n346\t                    states: pingpong.states,\n347\t                    cycle_count: pingpong.cycle_count,\n348\t                },\n349\t                evidence: LoopEvidence {\n350\t                    events_scanned: tail_events.len(),\n351\t                    sample_events: pingpong.sample,\n352\t                    detected_at,\n353\t                },\n354\t            }));\n355\t        }\n356\t\n357\t        // Pattern 3: Log runaway — excessive growth without completion.\n358\t        // This requires checking file metadata, not just event content.\n359\t        if let Some(runaway) = self.detect_log_runaway(record, log_path, &events)? {\n360\t            return Ok(Some(LiveLoopWorker {\n361\t                heartbeat: record.clone(),\n362\t                loop_type: LoopType::LogRunaway {\n363\t                    bytes_growth: runaway.bytes_growth,\n364\t                    window_secs: runaway.window_secs,\n365\t                },\n366\t                evidence: LoopEvidence {\n367\t                    events_scanned: tail_events.len(),\n368\t                    sample_events: runaway.sample,\n369\t                    detected_at,\n370\t                },\n371\t            }));\n372\t        }\n373\t\n374\t        Ok(None)\n375\t    }\n376\t\n377\t    /// Detect claim churn: repeated race_lost events for the same bead.\n378\t    fn detect_claim_churn(&self, events: &[TelemetryEventLike]) -> Option<ClaimChurnInfo> {\n379\t        let mut race_lost_counts: HashMap<String, u32> = HashMap::new();\n380\t        let mut sample: Vec<String> = Vec::new();\n381\t\n382\t        for ev in events.iter().rev() {\n383\t            if ev.event_type == \"bead.claim.race_lost\" {\n384\t                if let Some(bead_id) = &ev.bead_id {\n385\t                    *race_lost_counts.entry(bead_id.clone()).or_insert(0) += 1;\n386\t                    if sample.len() < 10 {\n387\t                        sample.push(format!(\"{} race_lost {}\", ev.timestamp, bead_id));\n388\t                    }\n389\t                }\n390\t            }\n391\t        }\n392\t\n393\t        for (bead_id, count) in &race_lost_counts {\n394\t            if *count >= self.config.claim_churn_threshold {\n395\t                return Some(ClaimChurnInfo {\n396\t                    bead_id: bead_id.clone(),\n397\t                    count: *count,\n398\t                    sample,\n399\t                });\n400\t            }\n401\t        }\n402\t\n403\t        None\n404\t    }\n405\t\n406\t    /// Detect state ping-pong: short state cycles without forward progress.\n407\t    fn detect_state_ping_pong(&self, events: &[TelemetryEventLike]) -> Option<StatePingPongInfo> {\n408\t        // Look for state_transition events and extract state sequences.\n409\t        let mut state_transitions: Vec<(DateTime<Utc>, String, String)> = Vec::new();\n410\t\n411\t        for ev in events.iter().rev() {\n412\t            if ev.event_type == \"worker.state_transition\" {\n413\t                if let (Some(from), Some(to)) = (&ev.data.get(\"from\"), &ev.data.get(\"to\")) {\n414\t                    if let (Some(from_str), Some(to_str)) = (from.as_str(), to.as_str()) {\n415\t                        state_transitions.push((\n416\t                            ev.timestamp,\n417\t                            from_str.to_string(),\n418\t                            to_str.to_string(),\n419\t                        ));\n420\t                    }\n421\t                }\n422\t            }\n423\t        }\n424\t\n425\t        if state_transitions.len() < 8 {\n426\t            return None; // Not enough transitions to detect a cycle.\n427\t        }\n428\t\n429\t        // Check for cycles of length <= 4 states.\n430\t        let window_size = 8.min(state_transitions.len());\n431\t        let window: Vec<_> = state_transitions\n432\t            .iter()\n433\t            .take(window_size)\n434\t            .map(|(_, _, to)| to.clone())\n435\t            .collect();\n436\t\n437\t        // Count unique states in the window.\n438\t        let unique_states: HashSet<_> = window.iter().collect();\n439\t\n440\t        if unique_states.len() <= 4 && window.len() >= 6 {\n441\t            // Check if we're cycling without forward-progress events.\n442\t            let has_forward_progress = events\n443\t                .iter()\n444\t                .any(|ev| matches!(ev.event_type.as_str(), \"agent.completed\" | \"bead.completed\"));\n445\t\n446\t            if !has_forward_progress {\n447\t                let sample = state_transitions\n448\t                    .iter()\n449\t                    .take(10)\n450\t                    .map(|(ts, from, to)| format!(\"{} {} -> {}\", ts.format(\"%H:%M:%S\"), from, to))\n451\t                    .collect();\n452\t\n453\t                return Some(StatePingPongInfo {\n454\t                    states: unique_states.iter().map(|s| (*s).clone()).collect(),\n455\t                    cycle_count: (window.len() / unique_states.len()) as u32,\n456\t                    sample,\n457\t                });\n458\t            }\n459\t        }\n460\t\n461\t        None\n462\t    }\n463\t\n464\t    /// Detect log runaway: excessive file growth without completion events.\n465\t    fn detect_log_runaway(\n466\t        &self,\n467\t        _record: &HeartbeatRecord,\n468\t        log_path: &Path,\n469\t        events: &[TelemetryEventLike],\n470\t    ) -> Result<Option<LogRunawayInfo>> {\n471\t        let metadata = std::fs::metadata(log_path)?;\n472\t        let file_size = metadata.len();\n473\t\n474\t        // Check for agent.completed events in the scanned window.\n475\t        let has_completed = events\n476\t            .iter()\n477\t            .any(|ev| ev.event_type == \"agent.completed\" || ev.event_type == \"bead.completed\");\n478\t\n479\t        if !has_completed && file_size > self.config.log_runaway_bytes {\n480\t            // Calculate time window from oldest to newest event.\n481\t            if let (Some(oldest), Some(newest)) = (events.first(), events.last()) {\n482\t                let window_secs = (newest.timestamp - oldest.timestamp).num_seconds().max(1) as u64;\n483\t\n484\t                if window_secs <= self.config.live_loop_window_secs {\n485\t                    let sample = events\n486\t                        .iter()\n487\t                        .rev()\n488\t                        .take(10)\n489\t                        .map(|ev| format!(\"{} {}\", ev.timestamp, ev.event_type))\n490\t                        .collect();\n491\t\n492\t                    return Ok(Some(LogRunawayInfo {\n493\t                        bytes_growth: file_size,\n494\t                        window_secs,\n495\t                        sample,\n496\t                    }));\n497\t                }\n498\t            }\n499\t\n500\t            // If we can't calculate window but file is huge and no completion, still flag.\n501\t            if file_size > self.config.log_runaway_bytes * 2 {\n502\t                let sample = events\n503\t                    .iter()\n504\t                    .rev()\n505\t                    .take(10)\n506\t                    .map(|ev| format!(\"{} {}\", ev.timestamp, ev.event_type))\n507\t                    .collect();\n508\t\n509\t                return Ok(Some(LogRunawayInfo {\n510\t                    bytes_growth: file_size,\n511\t                    window_secs: self.config.live_loop_window_secs,\n512\t                    sample,\n513\t                }));\n514\t            }\n515\t        }\n516\t\n517\t        Ok(None)\n518\t    }\n519\t\n520\t    /// Scan for failed workers (stale heartbeat + dead tmux session).\n521\t    ///\n522\t    /// Returns a list of heartbeat records for workers that are considered dead.\n523\t    fn scan_failed_workers(&self) -> Result<Vec<HeartbeatRecord>> {\n524\t        let mut failed = Vec::new();\n525\t\n526\t        // Read all *.json files from heartbeat directory.\n527\t        let entries = match std::fs::read_dir(&self.heartbeat_dir) {\n528\t            Ok(e) => e,\n529\t            Err(e) if e.kind() == std::io::ErrorKind::NotFound => {\n530\t                tracing::debug!(\"splice: heartbeat directory does not exist\");\n531\t                return Ok(Vec::new());\n532\t            }\n533\t            Err(e) => {\n534\t                return Err(e).context(\"failed to read heartbeat directory\");\n535\t            }\n536\t        };\n537\t\n538\t        for entry in entries {\n539\t            let entry = match entry {\n540\t                Ok(e) => e,\n541\t                Err(_) => continue,\n542\t            };\n543\t\n544\t            let path = entry.path();\n545\t            if path.extension().and_then(|s| s.to_str()) != Some(\"json\") {\n546\t                continue;\n547\t            }\n548\t\n549\t            // Parse the heartbeat file.\n550\t            let content = match std::fs::read_to_string(&path) {\n551\t                Ok(c) => c,\n552\t                Err(e) => {\n553\t                    tracing::warn!(\n554\t                        path = %path.display(),\n555\t                        error = %e,\n556\t                        \"splice: failed to read heartbeat file\"\n557\t                    );\n558\t                    continue;\n559\t                }\n560\t            };\n561\t\n562\t            let record: HeartbeatRecord = match serde_json::from_str(&content) {\n563\t                Ok(r) => r,\n564\t                Err(e) => {\n565\t                    tracing::warn!(\n566\t                        path = %path.display(),\n567\t                        error = %e,\n568\t                        \"splice: failed to parse heartbeat file\"\n569\t                    );\n570\t                    continue;\n571\t                }\n572\t            };\n573\t\n574\t            // Check if heartbeat is stale.\n575\t            let elapsed = Utc::now() - record.last_heartbeat;\n576\t            let stale_threshold_secs = self.config.stale_threshold_secs as i64;\n577\t            if elapsed.num_seconds() < stale_threshold_secs {\n578\t                continue;\n579\t            }\n580\t\n581\t            // Check if tmux session is still alive.\n582\t            let alive = std::process::Command::new(\"tmux\")\n583\t                .args([\"has-session\", \"-t\", &record.session])\n584\t                .status()\n585\t                .map(|s| s.success())\n586\t                .unwrap_or(false);\n587\t\n588\t            if !alive {\n589\t                // Session is dead — this is a failed worker.\n590\t                failed.push(record);\n591\t            }\n592\t        }\n593\t\n594\t        Ok(failed)\n595\t    }\n596\t\n597\t    /// Document a worker failure by creating a bead in the report workspace.\n598\t    ///\n599\t    /// If `report_workspace` is None or the workspace is invalid, returns Ok(())\n600\t    /// without creating a bead.\n601\t    async fn document_failure(&self, record: &HeartbeatRecord) -> Result<()> {\n602\t        let report_workspace = match &self.config.report_workspace {\n603\t            Some(ws) => ws,\n604\t            None => {\n605\t                tracing::debug!(\n606\t                    worker_id = %record.worker_id,\n607\t                    session = %record.session,\n608\t                    \"splice: no report workspace configured, skipping bead creation\"\n609\t                );\n610\t                return Ok(());\n611\t            }\n612\t        };\n613\t\n614\t        // Verify the workspace exists and has a .beads/ subdirectory.\n615\t        let beads_dir = report_workspace.join(\".beads\");\n616\t        if !report_workspace.exists() || !beads_dir.exists() {\n617\t            tracing::warn!(\n618\t                workspace = %report_workspace.display(),\n619\t                worker_id = %record.worker_id,\n620\t                \"splice: report workspace does not exist or has no .beads/ directory\"\n621\t            );\n622\t            return Ok(());\n623\t        }\n624\t\n625\t        // Instantiate bead store for the report workspace.\n626\t        let store = BrCliBeadStore::discover(report_workspace.clone())\n627\t            .context(\"failed to instantiate bead store for report workspace\")?;\n628\t\n629\t        // Build bead title.\n630\t        let title = format!(\"Worker failure: {} ({})\", record.worker_id, record.session);\n631\t\n632\t        // Calculate elapsed time since last heartbeat.\n633\t        let elapsed = Utc::now() - record.last_heartbeat;\n634\t        let elapsed_secs = elapsed.num_seconds();\n635\t        let elapsed_mins = elapsed_secs / 60;\n636\t        let elapsed_hours = elapsed_mins / 60;\n637\t        let elapsed_str = if elapsed_hours > 0 {\n638\t            format!(\"{}h {}m\", elapsed_hours, elapsed_mins % 60)\n639\t        } else if elapsed_mins > 0 {\n640\t            format!(\"{}m\", elapsed_mins)\n641\t        } else {\n642\t            format!(\"{}s\", elapsed_secs)\n643\t        };\n644\t\n645\t        // Build bead body.\n646\t        let current_bead_str = record.current_bead.as_deref().unwrap_or(\"(none)\");\n647\t        let body = format!(\n648\t            \"## Worker Failure\\n\\n\\\n649\t             **Worker:** {}\\n\\\n650\t             **Session:** {}\\n\\\n651\t             **Workspace:** {}\\n\\\n652\t             **Last heartbeat:** {} ({} ago)\\n\\\n653\t             **State at failure:** {}\\n\\\n654\t             **Beads processed:** {}\\n\\\n655\t             **Current bead:** {}\\n\\\n656\t             **PID:** {}\\n\",\n657\t            record.worker_id,\n658\t            record.session,\n659\t            record.workspace,\n660\t            record.last_heartbeat.format(\"%Y-%m-%d %H:%M:%S UTC\"),\n661\t            elapsed_str,\n662\t            record.state,\n663\t            record.beads_processed,\n664\t            current_bead_str,\n665\t            record.pid\n666\t        );\n667\t\n668\t        // Create the bead.\n669\t        let bead_id = store\n670\t            .create_bead(&title, &body, &[\"worker-failure\", \"human\"])\n671\t            .await\n672\t            .context(\"failed to create worker failure bead\")?;\n673\t\n674\t        tracing::info!(\n675\t            worker_id = %record.worker_id,\n676\t            session = %record.session,\n677\t            bead_id = %bead_id,\n678\t            \"splice: documented worker failure\"\n679\t        );\n680\t\n681\t        Ok(())\n682\t    }\n683\t\n684\t    /// Document a live-loop worker by creating a bead in the report workspace.\n685\t    ///\n686\t    /// If `report_workspace` is None or the workspace is invalid, returns Ok(())\n687\t    /// without creating a bead.\n688\t    async fn document_live_loop(&self, worker: &LiveLoopWorker) -> Result<()> {\n689\t        let report_workspace = match &self.config.report_workspace {\n690\t            Some(ws) => ws,\n691\t            None => {\n692\t                tracing::debug!(\n693\t                    worker_id = %worker.heartbeat.worker_id,\n694\t                    session = %worker.heartbeat.session,\n695\t                    \"splice: no report workspace configured, skipping loop bead creation\"\n696\t                );\n697\t                return Ok(());\n698\t            }\n699\t        };\n700\t\n701\t        // Verify the workspace exists and has a .beads/ subdirectory.\n702\t        let beads_dir = report_workspace.join(\".beads\");\n703\t        if !report_workspace.exists() || !beads_dir.exists() {\n704\t            tracing::warn!(\n705\t                workspace = %report_workspace.display(),\n706\t                worker_id = %worker.heartbeat.worker_id,\n707\t                \"splice: report workspace does not exist or has no .beads/ directory\"\n708\t            );\n709\t            return Ok(());\n710\t        }\n711\t\n712\t        // Instantiate bead store for the report workspace.\n713\t        let store = BrCliBeadStore::discover(report_workspace.clone())\n714\t            .context(\"failed to instantiate bead store for report workspace\")?;\n715\t\n716\t        // Build bead title and body based on loop type.\n717\t        let (title, pattern_name, details) = match &worker.loop_type {\n718\t            LoopType::ClaimChurn { bead_id, count } => {\n719\t                let title = format!(\n720\t                    \"Live loop: {} claim churn on bead {}\",\n721\t                    worker.heartbeat.worker_id, bead_id\n722\t                );\n723\t                let details = format!(\n724\t                    \"**Pattern:** Claim churn\\n\\\n725\t                     **Bead ID:** {}\\n\\\n726\t                     **Race-lost events (in last {}):** {}\\n\",\n727\t                    bead_id, worker.evidence.events_scanned, count\n728\t                );\n729\t                (title, \"claim_churn\".to_string(), details)\n730\t            }\n731\t            LoopType::StatePingPong {\n732\t                states,\n733\t                cycle_count,\n734\t            } => {\n735\t                let title = format!(\"Live loop: {} state ping-pong\", worker.heartbeat.worker_id);\n736\t                let state_list = states.join(\" → \");\n737\t                let details = format!(\n738\t                    \"**Pattern:** State ping-pong\\n\\\n739\t                     **States:** {}\\n\\\n740\t                     **Cycles detected:** {}\\n\",\n741\t                    state_list, cycle_count\n742\t                );\n743\t                (title, \"state_ping_pong\".to_string(), details)\n744\t            }\n745\t            LoopType::LogRunaway {\n746\t                bytes_growth,\n747\t                window_secs,\n748\t            } => {\n749\t                let title = format!(\n750\t                    \"Live loop: {} log runaway ({} MB)\",\n751\t                    worker.heartbeat.worker_id,\n752\t                    bytes_growth / 1024 / 1024\n753\t                );\n754\t                let details = format!(\n755\t                    \"**Pattern:** Log runaway\\n\\\n756\t                     **JSONL growth:** {} MB\\n\\\n757\t                     **Time window:** {}s\\n\\\n758\t                     **No completion events detected**\\n\",\n759\t                    bytes_growth / 1024 / 1024,\n760\t                    window_secs\n761\t                );\n762\t                (title, \"log_runaway\".to_string(), details)\n763\t            }\n764\t        };\n765\t\n766\t        // Build sample events section.\n767\t        let sample_section = if worker.evidence.sample_events.is_empty() {\n768\t            String::new()\n769\t        } else {\n770\t            let samples: String = worker\n771\t                .evidence\n772\t                .sample_events\n773\t                .iter()\n774\t                .take(20)\n775\t                .map(|s| format!(\"  - {}\\n\", s))\n776\t                .collect();\n777\t            format!(\n778\t                \"\\n## Sample Events (last {} scanned)\\n\\n```\\n{}\\n```\\n\",\n779\t                worker.evidence.events_scanned, samples\n780\t            )\n781\t        };\n782\t\n783\t        let body = format!(\n784\t            \"## Live Worker Loop Detected\\n\\n\\\n785\t             **Worker:** {}\\n\\\n786\t             **Session:** {}\\n\\\n787\t             **Workspace:** {}\\n\\\n788\t             **Last heartbeat:** {}\\n\\\n789\t             **State:** {}\\n\\\n790\t             **Beads processed:** {}\\n\\\n791\t             **Detected at:** {}\\n\\n\\\n792\t             ## Pattern Details\\n\\n\\\n793\t             {}{}\\n\\\n794\t             ## Context\\n\\n\\\n795\t             Worker is alive (fresh heartbeat) but making no forward progress.\\n\\\n796\t             Consider investigating the selector or agent dispatch logic.\",\n797\t            worker.heartbeat.worker_id,\n798\t            worker.heartbeat.session,\n799\t            worker.heartbeat.workspace,\n800\t            worker\n801\t                .heartbeat\n802\t                .last_heartbeat\n803\t                .format(\"%Y-%m-%d %H:%M:%S UTC\"),\n804\t            worker.heartbeat.state,\n805\t            worker.heartbeat.beads_processed,\n806\t            worker.evidence.detected_at.format(\"%Y-%m-%d %H:%M:%S UTC\"),\n807\t            details,\n808\t            sample_section\n809\t        );\n810\t\n811\t        // Create the bead.\n812\t        let bead_id = store\n813\t            .create_bead(&title, &body, &[\"worker-loop\", \"human\"])\n814\t            .await\n815\t            .context(\"failed to create worker loop bead\")?;\n816\t\n817\t        tracing::info!(\n818\t            worker_id = %worker.heartbeat.worker_id,\n819\t            session = %worker.heartbeat.session,\n820\t            pattern = %pattern_name,\n821\t            bead_id = %bead_id,\n822\t            \"splice: documented live loop\"\n823\t        );\n824\t\n825\t        Ok(())\n826\t    }\n827\t}\n828\t\n829\t#[async_trait::async_trait]\n830\timpl super::Strand for SpliceStrand {\n831\t    fn name(&self) -> &str {\n832\t        \"splice\"\n833\t    }\n834\t\n835\t    async fn evaluate(&self, _store: &dyn BeadStore) -> StrandResult {\n836\t        if !self.config.enabled {\n837\t            return StrandResult::NoWork;\n838\t        }\n839\t\n840\t        let mut state = SpliceState::load(&self.state_dir)\n841\t            .ok()\n842\t            .flatten()\n843\t            .unwrap_or_default();\n844\t        let mut documented = 0usize;\n845\t\n846\t        // Scan for failed workers (stale heartbeat + dead tmux session).\n847\t        let failed = match self.scan_failed_workers() {\n848\t            Ok(f) => f,\n849\t            Err(e) => {\n850\t                tracing::warn!(error = %e, \"splice: failed to scan heartbeats\");\n851\t                return StrandResult::NoWork;\n852\t            }\n853\t        };\n854\t\n855\t        for record in &failed {\n856\t            if state.documented_sessions.contains(&record.session) {\n857\t                continue;\n858\t            }\n859\t            match self.document_failure(record).await {\n860\t                Ok(()) => {\n861\t                    state.documented_sessions.insert(record.session.clone());\n862\t                    documented += 1;\n863\t                }\n864\t                Err(e) => {\n865\t                    tracing::warn!(\n866\t                        worker_id = %record.worker_id,\n867\t                        error = %e,\n868\t                        \"splice: failed to document worker failure\"\n869\t                    );\n870\t                }\n871\t            }\n872\t        }\n873\t\n874\t        // Scan for live-but-looping workers.\n875\t        let looping = match self.scan_live_loops() {\n876\t            Ok(l) => l,\n877\t            Err(e) => {\n878\t                tracing::warn!(error = %e, \"splice: failed to scan for live loops\");\n879\t                Vec::new()\n880\t            }\n881\t        };\n882\t\n883\t        for worker in &looping {\n884\t            // Build de-duplication key: (worker_id, session_id, pattern_name)\n885\t            let pattern_name = match &worker.loop_type {\n886\t                LoopType::ClaimChurn { .. } => \"claim_churn\",\n887\t                LoopType::StatePingPong { .. } => \"state_ping_pong\",\n888\t                LoopType::LogRunaway { .. } => \"log_runaway\",\n889\t            };\n890\t            let key = format!(\n891\t                \"{}-{}-{}\",\n892\t                worker.heartbeat.worker_id, worker.heartbeat.session, pattern_name\n893\t            );\n894\t\n895\t            if state.documented_loops.contains(&key) {\n896\t                continue;\n897\t            }\n898\t            match self.document_live_loop(worker).await {\n899\t                Ok(()) => {\n900\t                    state.documented_loops.insert(key);\n901\t                    documented += 1;\n902\t                }\n903\t                Err(e) => {\n904\t                    tracing::warn!(\n905\t                        worker_id = %worker.heartbeat.worker_id,\n906\t                        error = %e,\n907\t                        \"splice: failed to document live loop\"\n908\t                    );\n909\t                }\n910\t            }\n911\t        }\n912\t\n913\t        if documented > 0 {\n914\t            let _ = state.save(&self.state_dir);\n915\t            tracing::info!(documented, \"splice: documented worker failures and loops\");\n916\t            StrandResult::WorkCreated\n917\t        } else {\n918\t            StrandResult::NoWork\n919\t        }\n920\t    }\n921\t}\n922\t\n923\t// ──────────────────────────────────────────────────────────────────────────────\n924\t// Tests\n925\t// ──────────────────────────────────────────────────────────────────────────────\n926\t\n927\t#[cfg(test)]\n928\tmod tests {\n929\t    use super::*;\n930\t    use crate::strand::Strand as _;\n931\t\n932\t    /// Stub BeadStore for tests.\n933\t    struct NoOpStore;\n934\t\n935\t    #[async_trait::async_trait]\n936\t    impl BeadStore for NoOpStore {\n937\t        async fn list_all(&self) -> Result<Vec<crate::types::Bead>> {\n938\t            Ok(vec![])\n939\t        }\n940\t        async fn ready(\n941\t            &self,\n942\t            _filters: &crate::bead_store::Filters,\n943\t        ) -> Result<Vec<crate::types::Bead>> {\n944\t            Ok(vec![])\n945\t        }\n946\t        async fn show(&self, _id: &crate::types::BeadId) -> Result<crate::types::Bead> {\n947\t            anyhow::bail!(\"not found\")\n948\t        }\n949\t        async fn claim(\n950\t            &self,\n951\t            _id: &crate::types::BeadId,\n952\t            _actor: &str,\n953\t        ) -> Result<crate::types::ClaimResult> {\n954\t            anyhow::bail!(\"not implemented\")\n955\t        }\n956\t        async fn release(&self, _id: &crate::types::BeadId) -> Result<()> {\n957\t            Ok(())\n958\t        }\n959\t        async fn flush(&self) -> Result<()> {\n960\t            Ok(())\n961\t        }\n962\t        async fn reopen(&self, _id: &crate::types::BeadId) -> Result<()> {\n963\t            Ok(())\n964\t        }\n965\t        async fn labels(&self, _id: &crate::types::BeadId) -> Result<Vec<String>> {\n966\t            Ok(vec![])\n967\t        }\n968\t        async fn add_label(&self, _id: &crate::types::BeadId, _label: &str) -> Result<()> {\n969\t            Ok(())\n970\t        }\n971\t        async fn remove_label(&self, _id: &crate::types::BeadId, _label: &str) -> Result<()> {\n972\t            Ok(())\n973\t        }\n974\t        async fn create_bead(\n975\t            &self,\n976\t            _title: &str,\n977\t            _body: &str,\n978\t            _labels: &[&str],\n979\t        ) -> Result<crate::types::BeadId> {\n980\t            Ok(crate::types::BeadId::from(\"new-bead\".to_string()))\n981\t        }\n982\t        async fn doctor_repair(&self) -> Result<crate::bead_store::RepairReport> {\n983\t            Ok(crate::bead_store::RepairReport::default())\n984\t        }\n985\t        async fn doctor_check(&self) -> Result<crate::bead_store::RepairReport> {\n986\t            Ok(crate::bead_store::RepairReport::default())\n987\t        }\n988\t        async fn full_rebuild(&self) -> Result<()> {\n989\t            Ok(())\n990\t        }\n991\t        async fn add_dependency(\n992\t            &self,\n993\t            _blocker_id: &crate::types::BeadId,\n994\t            _blocked_id: &crate::types::BeadId,\n995\t        ) -> Result<()> {\n996\t            Ok(())\n997\t        }\n998\t        async fn remove_dependency(\n999\t            &self,\n1000\t            _blocked_id: &crate::types::BeadId,\n1001\t            _blocker_id: &crate::types::BeadId,\n1002\t        ) -> Result<()> {\n1003\t            Ok(())\n1004\t        }\n1005\t        async fn claim_auto(&self, _actor: &str) -> Result<crate::types::ClaimResult> {\n1006\t            Ok(crate::types::ClaimResult::NotClaimable {\n1007\t                reason: \"claim_auto not supported in mock\".to_string(),\n1008\t            })\n1009\t        }\n1010\t    }\n1011\t\n1012\t    #[test]\n1013\t    fn splice_strand_name() {\n1014\t        let config = SpliceConfig::default();\n1015\t        let tel = Telemetry::new(\"test\".to_string());\n1016\t        let strand = SpliceStrand::new(\n1017\t            config,\n1018\t            PathBuf::from(\"/tmp/heartbeats\"),\n1019\t            PathBuf::from(\"/tmp/state\"),\n1020\t            tel,\n1021\t        );\n1022\t        assert_eq!(strand.name(), \"splice\");\n1023\t    }\n1024\t\n1025\t    #[tokio::test]\n1026\t    async fn splice_disabled_returns_no_work() {\n1027\t        let config = SpliceConfig {\n1028\t            enabled: false,\n1029\t            ..Default::default()\n1030\t        };\n1031\t        let tel = Telemetry::new(\"test\".to_string());\n1032\t        let strand = SpliceStrand::new(\n1033\t            config,\n1034\t            PathBuf::from(\"/tmp/heartbeats\"),\n1035\t            PathBuf::from(\"/tmp/state\"),\n1036\t            tel,\n1037\t        );\n1038\t        let result = strand.evaluate(&NoOpStore).await;\n1039\t        assert!(matches!(result, StrandResult::NoWork));\n1040\t    }\n1041\t\n1042\t    #[test]\n1043\t    fn splice_state_roundtrip() {\n1044\t        let dir = tempfile::tempdir().unwrap();\n1045\t        let mut state = SpliceState::default();\n1046\t        state\n1047\t            .documented_sessions\n1048\t            .insert(\"session-abc123\".to_string());\n1049\t        state\n1050\t            .documented_sessions\n1051\t            .insert(\"session-xyz789\".to_string());\n1052\t\n1053\t        state.save(dir.path()).unwrap();\n1054\t\n1055\t        let loaded = SpliceState::load(dir.path()).unwrap().unwrap();\n1056\t        assert_eq!(loaded.documented_sessions.len(), 2);\n1057\t        assert!(loaded.documented_sessions.contains(\"session-abc123\"));\n1058\t        assert!(loaded.documented_sessions.contains(\"session-xyz789\"));\n1059\t    }\n1060\t\n1061\t    #[tokio::test]\n1062\t    async fn splice_no_heartbeats_returns_no_work() {\n1063\t        let config = SpliceConfig::default();\n1064\t        let tel = Telemetry::new(\"test\".to_string());\n1065\t        let temp_dir = tempfile::tempdir().unwrap();\n1066\t        let heartbeat_dir = temp_dir.path().join(\"heartbeats\");\n1067\t        std::fs::create_dir_all(&heartbeat_dir).unwrap();\n1068\t\n1069\t        let strand = SpliceStrand::new(config, heartbeat_dir, temp_dir.path().join(\"state\"), tel);\n1070\t\n1071\t        let result = strand.evaluate(&NoOpStore).await;\n1072\t        assert!(matches!(result, StrandResult::NoWork));\n1073\t    }\n1074\t}\n1075\t"}]},"parent_tool_use_id":null,"session_id":"72539a33-4a3d-4268-95e8-c3da33ecc3f7","uuid":"3f9f0e13-8f21-4778-b716-258431af56b3","timestamp":"2026-05-30T15:27:52.979Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/NEEDLE/src/strand/splice.rs","content":"//! Splice strand: worker failure documentation.\n//!\n//! Strand 8 in the waterfall (runs before Knot). Scans heartbeat files for\n//! workers with stale heartbeats whose tmux session is dead, and creates a\n//! failure bead in the configured report workspace for each undocumented failure.\n//!\n//! Also detects live-but-looping workers: workers with fresh heartbeats that are\n//! stuck in tight event loops (claim churn, state ping-pong, log runaway).\n//!\n//! Entry conditions:\n//! - `strands.splice.enabled` is true (default: true)\n//! - Heartbeat files exist in the heartbeat directory\n//! - At least one worker has a stale heartbeat and dead tmux session OR\n//!   a live worker exhibits loop patterns in its JSONL tail\n//!\n//! State persistence:\n//! - `splice_state.json` tracks which session IDs have already been documented\n//! - Prevents duplicate failure beads for the same dead/looping worker\n\nuse std::collections::{HashMap, HashSet};\nuse std::path::{Path, PathBuf};\n\nuse anyhow::{Context, Result};\nuse chrono::{DateTime, Utc};\nuse serde::{Deserialize, Serialize};\n\nuse crate::bead_store::{BeadStore, BrCliBeadStore};\nuse crate::config::SpliceConfig;\nuse crate::telemetry::Telemetry;\nuse crate::types::StrandResult;\n\n// ──────────────────────────────────────────────────────────────────────────────\n// TelemetryEventLike (minimal subset for JSONL scanning)\n// ──────────────────────────────────────────────────────────────────────────────\n\n/// Minimal telemetry event representation for JSONL tail scanning.\n#[derive(Debug, Deserialize)]\nstruct TelemetryEventLike {\n    timestamp: DateTime<Utc>,\n    event_type: String,\n    #[serde(default)]\n    bead_id: Option<String>,\n    #[serde(default)]\n    data: serde_json::Value,\n}\n\n// ──────────────────────────────────────────────────────────────────────────────\n// Loop detection result structures\n// ──────────────────────────────────────────────────────────────────────────────\n\n#[derive(Debug)]\nstruct ClaimChurnInfo {\n    bead_id: String,\n    count: u32,\n    sample: Vec<String>,\n}\n\n#[derive(Debug)]\nstruct StatePingPongInfo {\n    states: Vec<String>,\n    cycle_count: u32,\n    sample: Vec<String>,\n}\n\n#[derive(Debug)]\nstruct LogRunawayInfo {\n    bytes_growth: u64,\n    window_secs: u64,\n    sample: Vec<String>,\n}\n\n// ──────────────────────────────────────────────────────────────────────────────\n// HeartbeatRecord\n// ──────────────────────────────────────────────────────────────────────────────\n\n/// Heartbeat record deserialized from a worker's heartbeat file.\n#[derive(Debug, Deserialize, Clone)]\nstruct HeartbeatRecord {\n    worker_id: String,\n    pid: u32,\n    #[serde(default)]\n    state: String,\n    #[serde(default)]\n    current_bead: Option<String>,\n    workspace: String,\n    last_heartbeat: DateTime<Utc>,\n    session: String,\n    #[serde(default)]\n    beads_processed: u64,\n}\n\n// ──────────────────────────────────────────────────────────────────────────────\n// Loop detection types\n// ──────────────────────────────────────────────────────────────────────────────\n\n/// Type of live-loop pattern detected.\n#[derive(Debug, Clone)]\nenum LoopType {\n    /// Repeated claim.race_lost events for the same bead.\n    ClaimChurn { bead_id: String, count: u32 },\n    /// Excessive JSONL growth without forward progress.\n    LogRunaway { bytes_growth: u64, window_secs: u64 },\n    /// State ping-pong between a small set of states.\n    StatePingPong {\n        states: Vec<String>,\n        cycle_count: u32,\n    },\n}\n\n/// Evidence collected for a loop detection.\n#[derive(Debug, Clone)]\nstruct LoopEvidence {\n    /// Number of events scanned from JSONL tail.\n    events_scanned: usize,\n    /// Sample of recent events showing the pattern.\n    sample_events: Vec<String>,\n    /// When the loop was detected.\n    detected_at: DateTime<Utc>,\n}\n\n/// A worker exhibiting a live-loop pattern.\n#[derive(Debug, Clone)]\nstruct LiveLoopWorker {\n    /// The worker's heartbeat record.\n    heartbeat: HeartbeatRecord,\n    /// The type of loop detected.\n    loop_type: LoopType,\n    /// Evidence supporting the detection.\n    evidence: LoopEvidence,\n}\n\n// ──────────────────────────────────────────────────────────────────────────────\n// SpliceState\n// ──────────────────────────────────────────────────────────────────────────────\n\n/// Persisted state for the Splice strand.\n#[derive(Debug, Default, Serialize, Deserialize)]\nstruct SpliceState {\n    /// Session IDs that have already had a failure bead created (dead workers).\n    documented_sessions: HashSet<String>,\n    /// (worker_id, session_id, pattern_name) tuples already documented (live loops).\n    documented_loops: HashSet<String>,\n}\n\nimpl SpliceState {\n    /// Load state from the state directory, returning None if file doesn't exist.\n    fn load(state_dir: &Path) -> Result<Option<Self>> {\n        let path = state_dir.join(\"splice_state.json\");\n        if !path.exists() {\n            return Ok(None);\n        }\n        let content = std::fs::read_to_string(&path)\n            .with_context(|| format!(\"failed to read splice state: {}\", path.display()))?;\n        let state: SpliceState =\n            serde_json::from_str(&content).with_context(|| \"failed to parse splice state\")?;\n        Ok(Some(state))\n    }\n\n    /// Save state to the state directory.\n    fn save(&self, state_dir: &Path) -> Result<()> {\n        std::fs::create_dir_all(state_dir)\n            .with_context(|| format!(\"failed to create state dir: {}\", state_dir.display()))?;\n        let path = state_dir.join(\"splice_state.json\");\n        let content = serde_json::to_string_pretty(self)?;\n        std::fs::write(&path, content)\n            .with_context(|| format!(\"failed to write splice state: {}\", path.display()))?;\n        Ok(())\n    }\n}\n\n// ──────────────────────────────────────────────────────────────────────────────\n// SpliceStrand\n// ──────────────────────────────────────────────────────────────────────────────\n\n/// The Splice strand — worker failure documentation.\n///\n/// Scans heartbeat files for dead workers and creates failure beads.\npub struct SpliceStrand {\n    config: SpliceConfig,\n    heartbeat_dir: PathBuf,\n    state_dir: PathBuf,\n    #[allow(dead_code)]\n    telemetry: Telemetry,\n}\n\nimpl SpliceStrand {\n    /// Create a new SpliceStrand.\n    ///\n    /// - `config`: splice strand configuration\n    /// - `heartbeat_dir`: directory containing worker heartbeat JSON files\n    /// - `state_dir`: directory for persisting splice state\n    /// - `telemetry`: telemetry emitter\n    pub fn new(\n        config: SpliceConfig,\n        heartbeat_dir: PathBuf,\n        state_dir: PathBuf,\n        telemetry: Telemetry,\n    ) -> Self {\n        SpliceStrand {\n            config,\n            heartbeat_dir,\n            state_dir,\n            telemetry,\n        }\n    }\n\n    /// Derive the JSONL log path for a worker's session.\n    ///\n    /// Format: `<log_dir>/<worker_id>-<session_id>.jsonl`\n    fn worker_log_path(&self, worker_id: &str, session_id: &str) -> Option<PathBuf> {\n        // Try to get log_dir from the heartbeat record's workspace.\n        // Default to ~/.needle/logs if not configured.\n        let log_dir =\n            std::env::var_os(\"HOME\").map(|h| PathBuf::from(h).join(\".needle\").join(\"logs\"))?;\n\n        Some(log_dir.join(format!(\"{}-{}.jsonl\", worker_id, session_id)))\n    }\n\n    /// Read the last N events from a JSONL file.\n    ///\n    /// Returns lines in reverse order (newest first), limited to scan_events.\n    fn read_jsonl_tail(&self, path: &Path, scan_events: usize) -> Result<Vec<String>> {\n        let content = std::fs::read_to_string(path)\n            .with_context(|| format!(\"failed to read jsonl: {}\", path.display()))?;\n\n        let lines: Vec<&str> = content.lines().collect();\n        let tail_len = scan_events.min(lines.len());\n        let mut tail = Vec::with_capacity(tail_len);\n\n        for line in lines.iter().rev().take(tail_len) {\n            tail.push(line.to_string());\n        }\n\n        Ok(tail)\n    }\n\n    /// Scan live workers for loop patterns.\n    ///\n    /// Returns workers with fresh heartbeats that exhibit stuck-loop behavior.\n    fn scan_live_loops(&self) -> Result<Vec<LiveLoopWorker>> {\n        let mut looping = Vec::new();\n\n        if !self.config.detect_live_loops {\n            return Ok(looping);\n        }\n\n        let entries = match std::fs::read_dir(&self.heartbeat_dir) {\n            Ok(e) => e,\n            Err(e) if e.kind() == std::io::ErrorKind::NotFound => {\n                tracing::debug!(\"splice: heartbeat directory does not exist\");\n                return Ok(Vec::new());\n            }\n            Err(e) => {\n                return Err(e).context(\"failed to read heartbeat directory\");\n            }\n        };\n\n        for entry in entries {\n            let entry = match entry {\n                Ok(e) => e,\n                Err(_) => continue,\n            };\n\n            let path = entry.path();\n            if path.extension().and_then(|s| s.to_str()) != Some(\"json\") {\n                continue;\n            }\n\n            // Parse the heartbeat file.\n            let content = match std::fs::read_to_string(&path) {\n                Ok(c) => c,\n                Err(_) => continue,\n            };\n\n            let record: HeartbeatRecord = match serde_json::from_str(&content) {\n                Ok(r) => r,\n                Err(_) => continue,\n            };\n\n            // Skip stale heartbeats — those are handled by scan_failed_workers.\n            let elapsed = Utc::now() - record.last_heartbeat;\n            let stale_threshold_secs = self.config.stale_threshold_secs as i64;\n            if elapsed.num_seconds() >= stale_threshold_secs {\n                continue;\n            }\n\n            // Check for loop patterns in the JSONL tail.\n            let log_path = match self.worker_log_path(&record.worker_id, &record.session) {\n                Some(p) => p,\n                None => continue,\n            };\n\n            if !log_path.exists() {\n                continue;\n            }\n\n            if let Some(loop_worker) = self.check_worker_for_loops(&record, &log_path)? {\n                looping.push(loop_worker);\n            }\n        }\n\n        Ok(looping)\n    }\n\n    /// Check a single worker's JSONL for loop patterns.\n    ///\n    /// Returns Some(LiveLoopWorker) if a pattern is detected, None otherwise.\n    fn check_worker_for_loops(\n        &self,\n        record: &HeartbeatRecord,\n        log_path: &Path,\n    ) -> Result<Option<LiveLoopWorker>> {\n        let tail_events = self.read_jsonl_tail(log_path, self.config.live_loop_scan_events)?;\n\n        // Parse events into structured form for analysis.\n        let mut events: Vec<TelemetryEventLike> = Vec::new();\n        for line in &tail_events {\n            if let Ok(ev) = serde_json::from_str::<TelemetryEventLike>(line) {\n                events.push(ev);\n            }\n        }\n\n        let detected_at = Utc::now();\n\n        // Pattern 1: Claim churn — repeated race_lost for same bead.\n        if let Some(churn) = self.detect_claim_churn(&events) {\n            return Ok(Some(LiveLoopWorker {\n                heartbeat: record.clone(),\n                loop_type: LoopType::ClaimChurn {\n                    bead_id: churn.bead_id,\n                    count: churn.count,\n                },\n                evidence: LoopEvidence {\n                    events_scanned: tail_events.len(),\n                    sample_events: churn.sample,\n                    detected_at,\n                },\n            }));\n        }\n\n        // Pattern 2: State ping-pong — short cycle without forward progress.\n        if let Some(pingpong) = self.detect_state_ping_pong(&events) {\n            return Ok(Some(LiveLoopWorker {\n                heartbeat: record.clone(),\n                loop_type: LoopType::StatePingPong {\n                    states: pingpong.states,\n                    cycle_count: pingpong.cycle_count,\n                },\n                evidence: LoopEvidence {\n                    events_scanned: tail_events.len(),\n                    sample_events: pingpong.sample,\n                    detected_at,\n                },\n            }));\n        }\n\n        // Pattern 3: Log runaway — excessive growth without completion.\n        // This requires checking file metadata, not just event content.\n        if let Some(runaway) = self.detect_log_runaway(record, log_path, &events)? {\n            return Ok(Some(LiveLoopWorker {\n                heartbeat: record.clone(),\n                loop_type: LoopType::LogRunaway {\n                    bytes_growth: runaway.bytes_growth,\n                    window_secs: runaway.window_secs,\n                },\n                evidence: LoopEvidence {\n                    events_scanned: tail_events.len(),\n                    sample_events: runaway.sample,\n                    detected_at,\n                },\n            }));\n        }\n\n        Ok(None)\n    }\n\n    /// Detect claim churn: repeated race_lost events for the same bead.\n    fn detect_claim_churn(&self, events: &[TelemetryEventLike]) -> Option<ClaimChurnInfo> {\n        let mut race_lost_counts: HashMap<String, u32> = HashMap::new();\n        let mut sample: Vec<String> = Vec::new();\n\n        for ev in events.iter().rev() {\n            if ev.event_type == \"bead.claim.race_lost\" {\n                if let Some(bead_id) = &ev.bead_id {\n                    *race_lost_counts.entry(bead_id.clone()).or_insert(0) += 1;\n                    if sample.len() < 10 {\n                        sample.push(format!(\"{} race_lost {}\", ev.timestamp, bead_id));\n                    }\n                }\n            }\n        }\n\n        for (bead_id, count) in &race_lost_counts {\n            if *count >= self.config.claim_churn_threshold {\n                return Some(ClaimChurnInfo {\n                    bead_id: bead_id.clone(),\n                    count: *count,\n                    sample,\n                });\n            }\n        }\n\n        None\n    }\n\n    /// Detect state ping-pong: short state cycles without forward progress.\n    fn detect_state_ping_pong(&self, events: &[TelemetryEventLike]) -> Option<StatePingPongInfo> {\n        // Look for state_transition events and extract state sequences.\n        let mut state_transitions: Vec<(DateTime<Utc>, String, String)> = Vec::new();\n\n        for ev in events.iter().rev() {\n            if ev.event_type == \"worker.state_transition\" {\n                if let (Some(from), Some(to)) = (&ev.data.get(\"from\"), &ev.data.get(\"to\")) {\n                    if let (Some(from_str), Some(to_str)) = (from.as_str(), to.as_str()) {\n                        state_transitions.push((\n                            ev.timestamp,\n                            from_str.to_string(),\n                            to_str.to_string(),\n                        ));\n                    }\n                }\n            }\n        }\n\n        if state_transitions.len() < 8 {\n            return None; // Not enough transitions to detect a cycle.\n        }\n\n        // Check for cycles of length <= 4 states.\n        let window_size = 8.min(state_transitions.len());\n        let window: Vec<_> = state_transitions\n            .iter()\n            .take(window_size)\n            .map(|(_, _, to)| to.clone())\n            .collect();\n\n        // Count unique states in the window.\n        let unique_states: HashSet<_> = window.iter().collect();\n\n        if unique_states.len() <= 4 && window.len() >= 6 {\n            // Check if we're cycling without forward-progress events.\n            let has_forward_progress = events\n                .iter()\n                .any(|ev| matches!(ev.event_type.as_str(), \"agent.completed\" | \"bead.completed\"));\n\n            if !has_forward_progress {\n                let sample = state_transitions\n                    .iter()\n                    .take(10)\n                    .map(|(ts, from, to)| format!(\"{} {} -> {}\", ts.format(\"%H:%M:%S\"), from, to))\n                    .collect();\n\n                return Some(StatePingPongInfo {\n                    states: unique_states.iter().map(|s| (*s).clone()).collect(),\n                    cycle_count: (window.len() / unique_states.len()) as u32,\n                    sample,\n                });\n            }\n        }\n\n        None\n    }\n\n    /// Detect log runaway: excessive file growth without completion events.\n    fn detect_log_runaway(\n        &self,\n        _record: &HeartbeatRecord,\n        log_path: &Path,\n        events: &[TelemetryEventLike],\n    ) -> Result<Option<LogRunawayInfo>> {\n        let metadata = std::fs::metadata(log_path)?;\n        let file_size = metadata.len();\n\n        // Check for agent.completed events in the scanned window.\n        let has_completed = events\n            .iter()\n            .any(|ev| ev.event_type == \"agent.completed\" || ev.event_type == \"bead.completed\");\n\n        if !has_completed && file_size > self.config.log_runaway_bytes {\n            // Calculate time window from oldest to newest event.\n            if let (Some(oldest), Some(newest)) = (events.first(), events.last()) {\n                let window_secs = (newest.timestamp - oldest.timestamp).num_seconds().max(1) as u64;\n\n                if window_secs <= self.config.live_loop_window_secs {\n                    let sample = events\n                        .iter()\n                        .rev()\n                        .take(10)\n                        .map(|ev| format!(\"{} {}\", ev.timestamp, ev.event_type))\n                        .collect();\n\n                    return Ok(Some(LogRunawayInfo {\n                        bytes_growth: file_size,\n                        window_secs,\n                        sample,\n                    }));\n                }\n            }\n\n            // If we can't calculate window but file is huge and no completion, still flag.\n            if file_size > self.config.log_runaway_bytes * 2 {\n                let sample = events\n                    .iter()\n                    .rev()\n                    .take(10)\n                    .map(|ev| format!(\"{} {}\", ev.timestamp, ev.event_type))\n                    .collect();\n\n                return Ok(Some(LogRunawayInfo {\n                    bytes_growth: file_size,\n                    window_secs: self.config.live_loop_window_secs,\n                    sample,\n                }));\n            }\n        }\n\n        Ok(None)\n    }\n\n    /// Scan for failed workers (stale heartbeat + dead tmux session).\n    ///\n    /// Returns a list of heartbeat records for workers that are considered dead.\n    fn scan_failed_workers(&self) -> Result<Vec<HeartbeatRecord>> {\n        let mut failed = Vec::new();\n\n        // Read all *.json files from heartbeat directory.\n        let entries = match std::fs::read_dir(&self.heartbeat_dir) {\n            Ok(e) => e,\n            Err(e) if e.kind() == std::io::ErrorKind::NotFound => {\n                tracing::debug!(\"splice: heartbeat directory does not exist\");\n                return Ok(Vec::new());\n            }\n            Err(e) => {\n                return Err(e).context(\"failed to read heartbeat directory\");\n            }\n        };\n\n        for entry in entries {\n            let entry = match entry {\n                Ok(e) => e,\n                Err(_) => continue,\n            };\n\n            let path = entry.path();\n            if path.extension().and_then(|s| s.to_str()) != Some(\"json\") {\n                continue;\n            }\n\n            // Parse the heartbeat file.\n            let content = match std::fs::read_to_string(&path) {\n                Ok(c) => c,\n                Err(e) => {\n                    tracing::warn!(\n                        path = %path.display(),\n                        error = %e,\n                        \"splice: failed to read heartbeat file\"\n                    );\n                    continue;\n                }\n            };\n\n            let record: HeartbeatRecord = match serde_json::from_str(&content) {\n                Ok(r) => r,\n                Err(e) => {\n                    tracing::warn!(\n                        path = %path.display(),\n                        error = %e,\n                        \"splice: failed to parse heartbeat file\"\n                    );\n                    continue;\n                }\n            };\n\n            // Check if heartbeat is stale.\n            let elapsed = Utc::now() - record.last_heartbeat;\n            let stale_threshold_secs = self.config.stale_threshold_secs as i64;\n            if elapsed.num_seconds() < stale_threshold_secs {\n                continue;\n            }\n\n            // Check if tmux session is still alive.\n            let alive = std::process::Command::new(\"tmux\")\n                .args([\"has-session\", \"-t\", &record.session])\n                .status()\n                .map(|s| s.success())\n                .unwrap_or(false);\n\n            if !alive {\n                // Session is dead — this is a failed worker.\n                failed.push(record);\n            }\n        }\n\n        Ok(failed)\n    }\n\n    /// Document a worker failure by creating a bead in the report workspace.\n    ///\n    /// If `report_workspace` is None or the workspace is invalid, returns Ok(())\n    /// without creating a bead.\n    async fn document_failure(&self, record: &HeartbeatRecord) -> Result<()> {\n        let report_workspace = match &self.config.report_workspace {\n            Some(ws) => ws,\n            None => {\n                tracing::debug!(\n                    worker_id = %record.worker_id,\n                    session = %record.session,\n                    \"splice: no report workspace configured, skipping bead creation\"\n                );\n                return Ok(());\n            }\n        };\n\n        // Verify the workspace exists and has a .beads/ subdirectory.\n        let beads_dir = report_workspace.join(\".beads\");\n        if !report_workspace.exists() || !beads_dir.exists() {\n            tracing::warn!(\n                workspace = %report_workspace.display(),\n                worker_id = %record.worker_id,\n                \"splice: report workspace does not exist or has no .beads/ directory\"\n            );\n            return Ok(());\n        }\n\n        // Instantiate bead store for the report workspace.\n        let store = BrCliBeadStore::discover(report_workspace.clone())\n            .context(\"failed to instantiate bead store for report workspace\")?;\n\n        // Build bead title.\n        let title = format!(\"Worker failure: {} ({})\", record.worker_id, record.session);\n\n        // Calculate elapsed time since last heartbeat.\n        let elapsed = Utc::now() - record.last_heartbeat;\n        let elapsed_secs = elapsed.num_seconds();\n        let elapsed_mins = elapsed_secs / 60;\n        let elapsed_hours = elapsed_mins / 60;\n        let elapsed_str = if elapsed_hours > 0 {\n            format!(\"{}h {}m\", elapsed_hours, elapsed_mins % 60)\n        } else if elapsed_mins > 0 {\n            format!(\"{}m\", elapsed_mins)\n        } else {\n            format!(\"{}s\", elapsed_secs)\n        };\n\n        // Build bead body.\n        let current_bead_str = record.current_bead.as_deref().unwrap_or(\"(none)\");\n        let body = format!(\n            \"## Worker Failure\\n\\n\\\n             **Worker:** {}\\n\\\n             **Session:** {}\\n\\\n             **Workspace:** {}\\n\\\n             **Last heartbeat:** {} ({} ago)\\n\\\n             **State at failure:** {}\\n\\\n             **Beads processed:** {}\\n\\\n             **Current bead:** {}\\n\\\n             **PID:** {}\\n\",\n            record.worker_id,\n            record.session,\n            record.workspace,\n            record.last_heartbeat.format(\"%Y-%m-%d %H:%M:%S UTC\"),\n            elapsed_str,\n            record.state,\n            record.beads_processed,\n            current_bead_str,\n            record.pid\n        );\n\n        // Create the bead.\n        let bead_id = store\n            .create_bead(&title, &body, &[\"worker-failure\", \"human\"])\n            .await\n            .context(\"failed to create worker failure bead\")?;\n\n        tracing::info!(\n            worker_id = %record.worker_id,\n            session = %record.session,\n            bead_id = %bead_id,\n            \"splice: documented worker failure\"\n        );\n\n        Ok(())\n    }\n\n    /// Document a live-loop worker by creating a bead in the report workspace.\n    ///\n    /// If `report_workspace` is None or the workspace is invalid, returns Ok(())\n    /// without creating a bead.\n    async fn document_live_loop(&self, worker: &LiveLoopWorker) -> Result<()> {\n        let report_workspace = match &self.config.report_workspace {\n            Some(ws) => ws,\n            None => {\n                tracing::debug!(\n                    worker_id = %worker.heartbeat.worker_id,\n                    session = %worker.heartbeat.session,\n                    \"splice: no report workspace configured, skipping loop bead creation\"\n                );\n                return Ok(());\n            }\n        };\n\n        // Verify the workspace exists and has a .beads/ subdirectory.\n        let beads_dir = report_workspace.join(\".beads\");\n        if !report_workspace.exists() || !beads_dir.exists() {\n            tracing::warn!(\n                workspace = %report_workspace.display(),\n                worker_id = %worker.heartbeat.worker_id,\n                \"splice: report workspace does not exist or has no .beads/ directory\"\n            );\n            return Ok(());\n        }\n\n        // Instantiate bead store for the report workspace.\n        let store = BrCliBeadStore::discover(report_workspace.clone())\n            .context(\"failed to instantiate bead store for report workspace\")?;\n\n        // Build bead title and body based on loop type.\n        let (title, pattern_name, details) = match &worker.loop_type {\n            LoopType::ClaimChurn { bead_id, count } => {\n                let title = format!(\n                    \"Live loop: {} claim churn on bead {}\",\n                    worker.heartbeat.worker_id, bead_id\n                );\n                let details = format!(\n                    \"**Pattern:** Claim churn\\n\\\n                     **Bead ID:** {}\\n\\\n                     **Race-lost events (in last {}):** {}\\n\",\n                    bead_id, worker.evidence.events_scanned, count\n                );\n                (title, \"claim_churn\".to_string(), details)\n            }\n            LoopType::StatePingPong {\n                states,\n                cycle_count,\n            } => {\n                let title = format!(\"Live loop: {} state ping-pong\", worker.heartbeat.worker_id);\n                let state_list = states.join(\" → \");\n                let details = format!(\n                    \"**Pattern:** State ping-pong\\n\\\n                     **States:** {}\\n\\\n                     **Cycles detected:** {}\\n\",\n                    state_list, cycle_count\n                );\n                (title, \"state_ping_pong\".to_string(), details)\n            }\n            LoopType::LogRunaway {\n                bytes_growth,\n                window_secs,\n            } => {\n                let title = format!(\n                    \"Live loop: {} log runaway ({} MB)\",\n                    worker.heartbeat.worker_id,\n                    bytes_growth / 1024 / 1024\n                );\n                let details = format!(\n                    \"**Pattern:** Log runaway\\n\\\n                     **JSONL growth:** {} MB\\n\\\n                     **Time window:** {}s\\n\\\n                     **No completion events detected**\\n\",\n                    bytes_growth / 1024 / 1024,\n                    window_secs\n                );\n                (title, \"log_runaway\".to_string(), details)\n            }\n        };\n\n        // Build sample events section.\n        let sample_section = if worker.evidence.sample_events.is_empty() {\n            String::new()\n        } else {\n            let samples: String = worker\n                .evidence\n                .sample_events\n                .iter()\n                .take(20)\n                .map(|s| format!(\"  - {}\\n\", s))\n                .collect();\n            format!(\n                \"\\n## Sample Events (last {} scanned)\\n\\n```\\n{}\\n```\\n\",\n                worker.evidence.events_scanned, samples\n            )\n        };\n\n        let body = format!(\n            \"## Live Worker Loop Detected\\n\\n\\\n             **Worker:** {}\\n\\\n             **Session:** {}\\n\\\n             **Workspace:** {}\\n\\\n             **Last heartbeat:** {}\\n\\\n             **State:** {}\\n\\\n             **Beads processed:** {}\\n\\\n             **Detected at:** {}\\n\\n\\\n             ## Pattern Details\\n\\n\\\n             {}{}\\n\\\n             ## Context\\n\\n\\\n             Worker is alive (fresh heartbeat) but making no forward progress.\\n\\\n             Consider investigating the selector or agent dispatch logic.\",\n            worker.heartbeat.worker_id,\n            worker.heartbeat.session,\n            worker.heartbeat.workspace,\n            worker\n                .heartbeat\n                .last_heartbeat\n                .format(\"%Y-%m-%d %H:%M:%S UTC\"),\n            worker.heartbeat.state,\n            worker.heartbeat.beads_processed,\n            worker.evidence.detected_at.format(\"%Y-%m-%d %H:%M:%S UTC\"),\n            details,\n            sample_section\n        );\n\n        // Create the bead.\n        let bead_id = store\n            .create_bead(&title, &body, &[\"worker-loop\", \"human\"])\n            .await\n            .context(\"failed to create worker loop bead\")?;\n\n        tracing::info!(\n            worker_id = %worker.heartbeat.worker_id,\n            session = %worker.heartbeat.session,\n            pattern = %pattern_name,\n            bead_id = %bead_id,\n            \"splice: documented live loop\"\n        );\n\n        Ok(())\n    }\n}\n\n#[async_trait::async_trait]\nimpl super::Strand for SpliceStrand {\n    fn name(&self) -> &str {\n        \"splice\"\n    }\n\n    async fn evaluate(&self, _store: &dyn BeadStore) -> StrandResult {\n        if !self.config.enabled {\n            return StrandResult::NoWork;\n        }\n\n        let mut state = SpliceState::load(&self.state_dir)\n            .ok()\n            .flatten()\n            .unwrap_or_default();\n        let mut documented = 0usize;\n\n        // Scan for failed workers (stale heartbeat + dead tmux session).\n        let failed = match self.scan_failed_workers() {\n            Ok(f) => f,\n            Err(e) => {\n                tracing::warn!(error = %e, \"splice: failed to scan heartbeats\");\n                return StrandResult::NoWork;\n            }\n        };\n\n        for record in &failed {\n            if state.documented_sessions.contains(&record.session) {\n                continue;\n            }\n            match self.document_failure(record).await {\n                Ok(()) => {\n                    state.documented_sessions.insert(record.session.clone());\n                    documented += 1;\n                }\n                Err(e) => {\n                    tracing::warn!(\n                        worker_id = %record.worker_id,\n                        error = %e,\n                        \"splice: failed to document worker failure\"\n                    );\n                }\n            }\n        }\n\n        // Scan for live-but-looping workers.\n        let looping = match self.scan_live_loops() {\n            Ok(l) => l,\n            Err(e) => {\n                tracing::warn!(error = %e, \"splice: failed to scan for live loops\");\n                Vec::new()\n            }\n        };\n\n        for worker in &looping {\n            // Build de-duplication key: (worker_id, session_id, pattern_name)\n            let pattern_name = match &worker.loop_type {\n                LoopType::ClaimChurn { .. } => \"claim_churn\",\n                LoopType::StatePingPong { .. } => \"state_ping_pong\",\n                LoopType::LogRunaway { .. } => \"log_runaway\",\n            };\n            let key = format!(\n                \"{}-{}-{}\",\n                worker.heartbeat.worker_id, worker.heartbeat.session, pattern_name\n            );\n\n            if state.documented_loops.contains(&key) {\n                continue;\n            }\n            match self.document_live_loop(worker).await {\n                Ok(()) => {\n                    state.documented_loops.insert(key);\n                    documented += 1;\n                }\n                Err(e) => {\n                    tracing::warn!(\n                        worker_id = %worker.heartbeat.worker_id,\n                        error = %e,\n                        \"splice: failed to document live loop\"\n                    );\n                }\n            }\n        }\n\n        if documented > 0 {\n            let _ = state.save(&self.state_dir);\n            tracing::info!(documented, \"splice: documented worker failures and loops\");\n            StrandResult::WorkCreated\n        } else {\n            StrandResult::NoWork\n        }\n    }\n}\n\n// ──────────────────────────────────────────────────────────────────────────────\n// Tests\n// ──────────────────────────────────────────────────────────────────────────────\n\n#[cfg(test)]\nmod tests {\n    use super::*;\n    use crate::strand::Strand as _;\n\n    /// Stub BeadStore for tests.\n    struct NoOpStore;\n\n    #[async_trait::async_trait]\n    impl BeadStore for NoOpStore {\n        async fn list_all(&self) -> Result<Vec<crate::types::Bead>> {\n            Ok(vec![])\n        }\n        async fn ready(\n            &self,\n            _filters: &crate::bead_store::Filters,\n        ) -> Result<Vec<crate::types::Bead>> {\n            Ok(vec![])\n        }\n        async fn show(&self, _id: &crate::types::BeadId) -> Result<crate::types::Bead> {\n            anyhow::bail!(\"not found\")\n        }\n        async fn claim(\n            &self,\n            _id: &crate::types::BeadId,\n            _actor: &str,\n        ) -> Result<crate::types::ClaimResult> {\n            anyhow::bail!(\"not implemented\")\n        }\n        async fn release(&self, _id: &crate::types::BeadId) -> Result<()> {\n            Ok(())\n        }\n        async fn flush(&self) -> Result<()> {\n            Ok(())\n        }\n        async fn reopen(&self, _id: &crate::types::BeadId) -> Result<()> {\n            Ok(())\n        }\n        async fn labels(&self, _id: &crate::types::BeadId) -> Result<Vec<String>> {\n            Ok(vec![])\n        }\n        async fn add_label(&self, _id: &crate::types::BeadId, _label: &str) -> Result<()> {\n            Ok(())\n        }\n        async fn remove_label(&self, _id: &crate::types::BeadId, _label: &str) -> Result<()> {\n            Ok(())\n        }\n        async fn create_bead(\n            &self,\n            _title: &str,\n            _body: &str,\n            _labels: &[&str],\n        ) -> Result<crate::types::BeadId> {\n            Ok(crate::types::BeadId::from(\"new-bead\".to_string()))\n        }\n        async fn doctor_repair(&self) -> Result<crate::bead_store::RepairReport> {\n            Ok(crate::bead_store::RepairReport::default())\n        }\n        async fn doctor_check(&self) -> Result<crate::bead_store::RepairReport> {\n            Ok(crate::bead_store::RepairReport::default())\n        }\n        async fn full_rebuild(&self) -> Result<()> {\n            Ok(())\n        }\n        async fn add_dependency(\n            &self,\n            _blocker_id: &crate::types::BeadId,\n            _blocked_id: &crate::types::BeadId,\n        ) -> Result<()> {\n            Ok(())\n        }\n        async fn remove_dependency(\n            &self,\n            _blocked_id: &crate::types::BeadId,\n            _blocker_id: &crate::types::BeadId,\n        ) -> Result<()> {\n            Ok(())\n        }\n        async fn claim_auto(&self, _actor: &str) -> Result<crate::types::ClaimResult> {\n            Ok(crate::types::ClaimResult::NotClaimable {\n                reason: \"claim_auto not supported in mock\".to_string(),\n            })\n        }\n    }\n\n    #[test]\n    fn splice_strand_name() {\n        let config = SpliceConfig::default();\n        let tel = Telemetry::new(\"test\".to_string());\n        let strand = SpliceStrand::new(\n            config,\n            PathBuf::from(\"/tmp/heartbeats\"),\n            PathBuf::from(\"/tmp/state\"),\n            tel,\n        );\n        assert_eq!(strand.name(), \"splice\");\n    }\n\n    #[tokio::test]\n    async fn splice_disabled_returns_no_work() {\n        let config = SpliceConfig {\n            enabled: false,\n            ..Default::default()\n        };\n        let tel = Telemetry::new(\"test\".to_string());\n        let strand = SpliceStrand::new(\n            config,\n            PathBuf::from(\"/tmp/heartbeats\"),\n            PathBuf::from(\"/tmp/state\"),\n            tel,\n        );\n        let result = strand.evaluate(&NoOpStore).await;\n        assert!(matches!(result, StrandResult::NoWork));\n    }\n\n    #[test]\n    fn splice_state_roundtrip() {\n        let dir = tempfile::tempdir().unwrap();\n        let mut state = SpliceState::default();\n        state\n            .documented_sessions\n            .insert(\"session-abc123\".to_string());\n        state\n            .documented_sessions\n            .insert(\"session-xyz789\".to_string());\n\n        state.save(dir.path()).unwrap();\n\n        let loaded = SpliceState::load(dir.path()).unwrap().unwrap();\n        assert_eq!(loaded.documented_sessions.len(), 2);\n        assert!(loaded.documented_sessions.contains(\"session-abc123\"));\n        assert!(loaded.documented_sessions.contains(\"session-xyz789\"));\n    }\n\n    #[tokio::test]\n    async fn splice_no_heartbeats_returns_no_work() {\n        let config = SpliceConfig::default();\n        let tel = Telemetry::new(\"test\".to_string());\n        let temp_dir = tempfile::tempdir().unwrap();\n        let heartbeat_dir = temp_dir.path().join(\"heartbeats\");\n        std::fs::create_dir_all(&heartbeat_dir).unwrap();\n\n        let strand = SpliceStrand::new(config, heartbeat_dir, temp_dir.path().join(\"state\"), tel);\n\n        let result = strand.evaluate(&NoOpStore).await;\n        assert!(matches!(result, StrandResult::NoWork));\n    }\n}\n","numLines":1075,"startLine":1,"totalLines":1075}}}
{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_92ac97f60c234aa8b73eb12a","type":"tool_result","content":"<system-reminder>[Truncated: PARTIAL view — showing lines 1-2033 of 3828 total (40001 tokens, cap 25000). Call Read with offset=2034 limit=2033 for the next page, or Grep to find a specific section. Do NOT answer from this page alone if the answer may be further in the file.]</system-reminder>\n\n1\t# NEEDLE Implementation Plan\n2\t\n3\t> **N**avigates **E**very **E**nqueued **D**eliverable, **L**ogs **E**ffort\n4\t\n5\t## Design Principles\n6\t\n7\tThese six principles are non-negotiable. Every design decision in this plan traces back to one or more of them.\n8\t\n9\t1. **Deterministic order.** Given the same queue state, every worker computes the same bead ordering. There is no randomness in selection. Ties are broken by creation time.\n10\t\n11\t2. **Explicit outcome paths.** Every possible result of every operation has a named handler. If an outcome can happen, it has a handler. If it doesn't have a handler, it cannot happen. The type system enforces exhaustiveness.\n12\t\n13\t3. **Platform and model agnostic.** NEEDLE wraps any headless CLI that accepts a prompt and exits. It runs on any POSIX system. It does not depend on any specific AI provider, model, or API.\n14\t\n15\t4. **Observable by default.** Every state transition, claim attempt, dispatch, and outcome emits structured telemetry. A silent worker is a broken worker. Telemetry is structured from origin (JSONL) and exportable as OpenTelemetry (OTLP) so any compliant backend — Tempo, Jaeger, Grafana, Honeycomb, Datadog, FABRIC — can consume NEEDLE's signals without a custom adapter.\n16\t\n17\t5. **Self-healing.** Workers detect and recover from stuck states, stale claims, crashed peers, and corrupted databases without human intervention. Recovery paths are explicit, not heuristic.\n18\t\n19\t6. **Separation of concerns.** The orchestrator does not execute work. The agent does not manage state. The bead store does not enforce workflow. Each component has one job.\n20\t\n21\t---\n22\t\n23\t## Architecture Overview\n24\t\n25\tNEEDLE is composed of five layers:\n26\t\n27\t```\n28\t┌──────────────────────────────────────────────────────────────┐\n29\t│                        CLI Layer                              │\n30\t│  needle run | stop | list | attach | status | config          │\n31\t├──────────────────────────────────────────────────────────────┤\n32\t│                     Worker Layer                              │\n33\t│  Worker loop, strand waterfall, session management            │\n34\t├──────────────────────────────────────────────────────────────┤\n35\t│                  Coordination Layer                            │\n36\t│  Claiming, locking, heartbeats, peer awareness                │\n37\t├──────────────────────────────────────────────────────────────┤\n38\t│                    Agent Layer                                 │\n39\t│  Adapter interface, dispatch, result capture                  │\n40\t├──────────────────────────────────────────────────────────────┤\n41\t│                   Foundation Layer                             │\n42\t│  Telemetry, configuration, bead store interface, self-healing │\n43\t└──────────────────────────────────────────────────────────────┘\n44\t```\n45\t\n46\t### Component Map\n47\t\n48\t| Component | Responsibility | Inputs | Outputs |\n49\t|-----------|---------------|--------|---------|\n50\t| **CLI** | Parse commands, manage sessions | User commands | Worker processes |\n51\t| **Worker** | Execute the strand waterfall loop | Bead queue state | Dispatch requests, state transitions |\n52\t| **StrandRunner** | Evaluate strands in sequence | Queue state, config | Next bead or escalation |\n53\t| **Claimer** | Atomic bead claiming with serialization | Candidate bead ID | Claimed bead or race-lost signal |\n54\t| **PromptBuilder** | Construct deterministic prompts from bead context | Claimed bead | Prompt string |\n55\t| **Dispatcher** | Load adapter, render template, execute agent | Prompt, adapter config | Agent process handle |\n56\t| **OutcomeHandler** | Route exit code to explicit handler | Exit code, stdout/stderr | State transition |\n57\t| **Telemetry** | Structured event emission | Any component event | JSONL records |\n58\t| **HealthMonitor** | Heartbeat, stuck detection, peer awareness | Worker state | Recovery actions |\n59\t| **ConfigLoader** | Hierarchical config resolution | Files, env, CLI args | Resolved config |\n60\t| **BeadStore** | Abstract interface to bead backend | CRUD operations | Bead records |\n61\t| **Mitosis** | Split multi-task beads into children with dedup | Failed bead, parent's existing children | Child beads or no-op |\n62\t\n63\t---\n64\t\n65\t## Language Decision\n66\t\n67\tThe implementation language must provide:\n68\t\n69\t| Requirement | Why | Source |\n70\t|-------------|-----|--------|\n71\t| Exhaustive pattern matching | Every outcome must be handled; compiler enforces it | Principle 2, bead-lifecycle-bugs.md |\n72\t| Real module system | 45K single-file bash was unmaintainable | bash-at-scale-problems.md |\n73\t| Structured error types | Silent failures caused cascading bugs | claim-race-conditions.md |\n74\t| Native JSON support | Fragile jq parsing corrupted state | worker-starvation-lessons.md |\n75\t| Proper concurrency primitives | flock/trap/PID files were inadequate | concurrency-approaches-compared.md |\n76\t| Single binary distribution | NEEDLE must be trivially installable | Principle 3 |\n77\t| Cross-platform | Linux, macOS at minimum | Principle 3 |\n78\t| Static analysis | Catch undefined functions, unused variables at compile time | bundler-build-integrity.md |\n79\t\n80\t**Recommended: Rust.** Exhaustive `match`, `Result<T, E>` error handling, `serde_json`, `tokio` for async, single binary via static linking, cross-compilation. The beads ecosystem already has Rust precedent (beads_rust, beads-polis).\n81\t\n82\t**Acceptable alternative: Go.** Simpler learning curve, good concurrency, single binary. Lacks exhaustive matching (requires discipline instead of compiler enforcement).\n83\t\n84\t**Not acceptable: Bash, Python, Node.** Bash failed at scale (documented). Python/Node require runtime dependencies, violating single-binary distribution.\n85\t\n86\t---\n87\t\n88\t## Key Decisions from Research\n89\t\n90\tThese decisions are informed by the 14 research files in `docs/research/`:\n91\t\n92\t| Decision | Chosen Approach | Alternative Considered | Why |\n93\t|----------|----------------|----------------------|-----|\n94\t| Bead store interface | Abstract trait over `br` CLI | Direct SQLite access | Platform agnostic; works with future bead backends |\n95\t| Claim atomicity | `br update --claim` + workspace flock | Central coordinator (Perles) | No SPOF; works with decentralized workers |\n96\t| Heartbeat model | File-based heartbeat with TTL (from beads-polis) | Shared memory | Survives worker crashes; observable by peers |\n97\t| Validation gates | Pluggable gate system (inspired by bg-gate) | Hardcoded checks | Different workspaces need different validation |\n98\t| Work decomposition | Built-in mitosis with child-aware dedup | External only (spec2beads) | Mitosis is valid when the split criteria are semantic (multi-task detection) and dedup checks the parent's existing children |\n99\t| Self-modification | Allowed with release channel promotion (testing → stable → fleet hot-reload) | Prohibited entirely | v1 failures came from untested changes deploying directly to the fleet. Canary testing with defined inputs/outputs prevents this. |\n100\t| Workspace discovery | Explicit configuration | Filesystem scanning | Explore strand's unbounded find caused 35+ load |\n101\t| Alert system | Verify-then-alert with rate limiting | Alert-on-empty | 100% false positive rate from naive alerting |\n102\t\n103\t## Key Decisions from Operational Learnings\n104\t\n105\tThese decisions are informed by the 9 notes files in `docs/notes/`:\n106\t\n107\t| Learning | Design Response |\n108\t|----------|----------------|\n109\t| Mitosis explosion (5,741 duplicate beads) | Mitosis checks parent's existing children before creating new ones. Duplicate splits are structurally impossible. Split criteria are semantic (multi-task detection), not numeric. |\n110\t| 100% false positive starvation alerts | Three-state model: no beads exist / all claimed / invisible. Verify independently before alerting. |\n111\t| Bundler shipped undefined functions | Compiled language eliminates this class entirely. |\n112\t| Agent-owned closure most reliable | NEEDLE does not close beads. Agent receives `br close <id>` instruction in prompt. |\n113\t| stdout/stderr corruption | Telemetry is a structured system, never interleaved with agent output. |\n114\t| Workers modifying their own orchestrator | Self-modification allowed via release channels. New builds must pass canary tests in isolation before promotion to `:stable`. Fleet hot-reloads from `:stable`, never from `:testing`. |\n115\t| ~20 worker practical limit (EX44) | Fleet sizing is bounded by three runtime factors: provider inference throughput, available CPU, and available RAM. NEEDLE monitors these and warns when saturated. Staggered launch is default. |\n116\t| Bead granularity affects success rate | Document guidelines but don't enforce — this is a bead authoring concern, not orchestration. |\n117\t\n118\t---\n119\t\n120\t# State Machine\n121\t\n122\tThe worker loop is a finite state machine. Every state has defined entry conditions, actions, and exit transitions. There are no implicit states or fallthrough paths.\n123\t\n124\t## Worker States\n125\t\n126\t```\n127\t                    ┌──────────┐\n128\t                    │  BOOTING │\n129\t                    └────┬─────┘\n130\t                         │ config loaded, health check passed\n131\t                         ▼\n132\t                    ┌──────────┐\n133\t              ┌────►│ SELECTING│◄──────────────────────────────┐\n134\t              │     └────┬─────┘                                │\n135\t              │          │ candidate found                      │\n136\t              │          ▼                                      │\n137\t              │     ┌──────────┐  race lost (retry < max)      │\n138\t              │     │ CLAIMING │──────────────────────────┐    │\n139\t              │     └────┬─────┘                           │    │\n140\t              │          │ claimed                         │    │\n141\t              │          ▼                                 ▼    │\n142\t              │     ┌──────────┐                     ┌────────┐│\n143\t              │     │ BUILDING │                     │RETRYING││\n144\t              │     └────┬─────┘                     └────┬───┘│\n145\t              │          │ prompt ready                   │     │\n146\t              │          ▼                                └─────┘\n147\t              │     ┌────────────┐\n148\t              │     │DISPATCHING │\n149\t              │     └────┬───────┘\n150\t              │          │ agent process started\n151\t              │          ▼\n152\t              │     ┌──────────┐\n153\t              │     │ EXECUTING│\n154\t              │     └────┬─────┘\n155\t              │          │ agent exited\n156\t              │          ▼\n157\t              │     ┌──────────┐\n158\t              │     │ HANDLING │\n159\t              │     └────┬─────┘\n160\t              │          │ outcome processed\n161\t              │          ▼\n162\t              │     ┌──────────┐\n163\t              │     │ LOGGING  │\n164\t              │     └────┬─────┘\n165\t              │          │ telemetry emitted\n166\t              └──────────┘\n167\t```\n168\t\n169\t### Terminal States\n170\t\n171\t```\n172\t    ┌───────────┐       ┌───────────┐       ┌───────────┐\n173\t    │ EXHAUSTED │       │  STOPPED  │       │  ERRORED  │\n174\t    └───────────┘       └───────────┘       └───────────┘\n175\t    all strands empty   graceful shutdown   unrecoverable\n176\t```\n177\t\n178\t## State Definitions\n179\t\n180\t### BOOTING\n181\t\n182\t**Entry:** Worker process started.\n183\t\n184\t**Actions:**\n185\t1. Load configuration (global → workspace → CLI overrides)\n186\t2. Validate bead store connectivity (`br doctor` or equivalent)\n187\t3. Register in worker state registry\n188\t4. Emit `worker.started` telemetry event\n189\t5. Start heartbeat emitter\n190\t\n191\t**Transitions:**\n192\t| Condition | Next State |\n193\t|-----------|-----------|\n194\t| Config loaded, bead store healthy | SELECTING |\n195\t| Config invalid | ERRORED |\n196\t| Bead store unreachable | ERRORED (after retry with backoff) |\n197\t\n198\t### SELECTING\n199\t\n200\t**Entry:** Worker is ready for next bead. This is the strand waterfall entry point.\n201\t\n202\t**Actions:**\n203\t1. Emit heartbeat\n204\t2. Evaluate strands in sequence\n205\t3. First strand that yields a candidate bead wins\n206\t\n207\t**Transitions:**\n208\t| Condition | Next State |\n209\t|-----------|-----------|\n210\t| Candidate bead found | CLAIMING |\n211\t| All strands exhausted | EXHAUSTED |\n212\t| Shutdown signal received | STOPPED |\n213\t\n214\t### CLAIMING\n215\t\n216\t**Entry:** A candidate bead has been selected.\n217\t\n218\t**Actions:**\n219\t1. Acquire workspace claim lock (flock, per-workspace)\n220\t2. Verify bead is still claimable (`br show --json`, check status + assignee)\n221\t3. Attempt atomic claim: `br update <id> --claim --actor <worker-id>`\n222\t4. Release workspace claim lock\n223\t5. Emit `bead.claim.attempted` telemetry\n224\t\n225\t**Transitions:**\n226\t| Condition | Exit Code | Next State |\n227\t|-----------|-----------|-----------|\n228\t| Claim succeeded | 0 | BUILDING |\n229\t| Race lost (already claimed) | 4 | RETRYING |\n230\t| Bead no longer claimable (closed, deferred) | 1 | SELECTING |\n231\t| Bead store error | >0 | SELECTING (after backoff) |\n232\t| Max retries exceeded | — | SELECTING (exclude this bead, reset retry counter) |\n233\t\n234\t### RETRYING\n235\t\n236\t**Entry:** A claim attempt failed due to race condition.\n237\t\n238\t**Actions:**\n239\t1. Increment retry counter for this selection cycle\n240\t2. Add failed bead ID to exclusion set\n241\t3. Emit `bead.claim.race_lost` telemetry\n242\t\n243\t**Transitions:**\n244\t| Condition | Next State |\n245\t|-----------|-----------|\n246\t| Retry count < max_retries (default: 5) | CLAIMING (with next candidate from same strand) |\n247\t| Retry count >= max_retries | SELECTING (reset, move to next strand) |\n248\t\n249\t### BUILDING\n250\t\n251\t**Entry:** Bead is claimed by this worker.\n252\t\n253\t**Actions:**\n254\t1. Read full bead context: title, body, dependencies, labels, workspace path\n255\t2. Read workspace context: CLAUDE.md, AGENTS.md, .beads/config.yaml\n256\t3. Construct prompt from template (deterministic: same bead → same prompt)\n257\t4. Include bead ID and `br close <id>` instruction in prompt\n258\t5. Emit `prompt.built` telemetry (bead ID, prompt hash, token estimate)\n259\t\n260\t**Transitions:**\n261\t| Condition | Next State |\n262\t|-----------|-----------|\n263\t| Prompt built successfully | DISPATCHING |\n264\t| Bead context unreadable | HANDLING (outcome: failure, release bead) |\n265\t\n266\t### DISPATCHING\n267\t\n268\t**Entry:** Prompt is ready.\n269\t\n270\t**Actions:**\n271\t1. Load agent adapter configuration (YAML)\n272\t2. Resolve invoke template with prompt, workspace path, environment\n273\t3. Start agent process via rendered command\n274\t4. Record process PID, start time\n275\t5. Emit `agent.dispatched` telemetry (agent name, model, workspace)\n276\t\n277\t**Transitions:**\n278\t| Condition | Next State |\n279\t|-----------|-----------|\n280\t| Agent process started | EXECUTING |\n281\t| Agent binary not found | HANDLING (outcome: failure, release bead) |\n282\t| Adapter config invalid | HANDLING (outcome: failure, release bead) |\n283\t\n284\t### EXECUTING\n285\t\n286\t**Entry:** Agent process is running.\n287\t\n288\t**Actions:**\n289\t1. Wait for agent process to exit\n290\t2. Capture stdout, stderr, exit code\n291\t3. Monitor execution timeout\n292\t4. Continue emitting heartbeats while waiting\n293\t5. Emit `agent.executing` heartbeat telemetry periodically\n294\t\n295\t**Transitions:**\n296\t| Condition | Exit Code | Next State |\n297\t|-----------|-----------|-----------|\n298\t| Agent exited normally | any | HANDLING |\n299\t| Execution timeout exceeded | — | Kill process → HANDLING (outcome: timeout) |\n300\t| Shutdown signal received | — | Kill process → HANDLING (outcome: interrupted) |\n301\t\n302\t### HANDLING\n303\t\n304\t**Entry:** Agent has exited (or was killed). This is where outcome routing happens.\n305\t\n306\t**Actions:**\n307\t1. Classify outcome by exit code\n308\t2. Execute the handler for that outcome class\n309\t3. Emit `bead.outcome` telemetry\n310\t\n311\t**Outcome Table:**\n312\t\n313\t| Outcome | Exit Code | Handler | Bead Action |\n314\t|---------|-----------|---------|-------------|\n315\t| **Success** | 0 | Verify bead was closed by agent. If not, log warning (do not auto-close). | None (agent owns closure) |\n316\t| **Failure** | 1 | Evaluate for mitosis (see Mitosis section). If splittable, split and block parent. If not, release bead (`br update --status open --unassign`). Increment failure count via label. | Split or released |\n317\t| **Timeout** | 124 | Release bead. Add `deferred` label. | Released + deferred |\n318\t| **Crash** | >128 (signal) | Release bead. Create alert bead in workspace. | Released + alert |\n319\t| **Race Lost** | 4 | (Handled at CLAIMING, should not reach here) | N/A |\n320\t| **Interrupted** | — | Release bead. Clean shutdown. | Released |\n321\t| **Agent Not Found** | 127 | Release bead. Emit error. Do not retry (config issue). | Released |\n322\t| **Build Failure** | — | Release bead. Emit error. | Released |\n323\t\n324\t**Agent-owned closure:** NEEDLE does not close beads. The agent is instructed (via prompt) to run `br close <id>` upon successful completion. If the bead is still open after a success exit code, NEEDLE logs a warning but does not intervene. This is a deliberate design choice based on operational experience (see `docs/notes/bead-lifecycle-bugs.md`).\n325\t\n326\t**Transitions:**\n327\t| Condition | Next State |\n328\t|-----------|-----------|\n329\t| Outcome processed | LOGGING |\n330\t\n331\t### LOGGING\n332\t\n333\t**Entry:** Outcome has been handled.\n334\t\n335\t**Actions:**\n336\t1. Record effort: elapsed time, exit code, token count (if extractable), estimated cost\n337\t2. Emit `bead.completed` or `bead.released` telemetry\n338\t3. Update worker state registry (beads processed, current streak)\n339\t4. Reset retry counter and exclusion set\n340\t\n341\t**Transitions:**\n342\t| Condition | Next State |\n343\t|-----------|-----------|\n344\t| Logging complete | SELECTING |\n345\t\n346\t### EXHAUSTED\n347\t\n348\t**Entry:** All strands returned no work.\n349\t\n350\t**Actions:**\n351\t1. Emit `worker.exhausted` telemetry\n352\t2. If `idle_timeout` configured, start countdown\n353\t3. If `idle_action` is `wait`, sleep with exponential backoff (max 60s)\n354\t4. If `idle_action` is `exit`, terminate\n355\t\n356\t**Transitions:**\n357\t| Condition | Next State |\n358\t|-----------|-----------|\n359\t| Backoff expired, retry strands | SELECTING |\n360\t| Idle timeout exceeded | STOPPED |\n361\t| Shutdown signal received | STOPPED |\n362\t\n363\t### STOPPED\n364\t\n365\t**Entry:** Graceful shutdown.\n366\t\n367\t**Actions:**\n368\t1. Release any claimed bead\n369\t2. Deregister from worker state registry\n370\t3. Stop heartbeat emitter\n371\t4. Emit `worker.stopped` telemetry\n372\t5. Exit process\n373\t\n374\t**Transitions:** None (terminal).\n375\t\n376\t### ERRORED\n377\t\n378\t**Entry:** Unrecoverable error.\n379\t\n380\t**Actions:**\n381\t1. Release any claimed bead (best-effort)\n382\t2. Emit `worker.errored` telemetry with error details\n383\t3. Deregister from worker state registry (best-effort)\n384\t4. Exit process with non-zero code\n385\t\n386\t**Transitions:** None (terminal).\n387\t\n388\t## Error Model\n389\t\n390\tErrors are classified into three tiers:\n391\t\n392\t### Tier 1: Transient (retry)\n393\t\n394\tTemporary failures that resolve on their own. The worker retries with backoff.\n395\t\n396\t- Bead store temporarily unreachable\n397\t- Claim race lost\n398\t- Lock contention timeout\n399\t- Agent timeout (may succeed on re-dispatch)\n400\t\n401\t### Tier 2: Bead-scoped (release and continue)\n402\t\n403\tFailures specific to one bead. Release it and move on.\n404\t\n405\t- Agent exited with failure\n406\t- Prompt build failed (bead context unreadable)\n407\t- Agent binary missing\n408\t\n409\t### Tier 3: Worker-scoped (exit)\n410\t\n411\tFailures that affect the worker's ability to function. Exit and let the fleet manager handle it.\n412\t\n413\t- Configuration invalid\n414\t- Bead store persistently unreachable\n415\t- Filesystem full\n416\t- Heartbeat file unwritable\n417\t\n418\t## Invariants\n419\t\n420\tThese must hold at all times. Violation of any invariant is a bug.\n421\t\n422\t1. **A worker holds at most one claimed bead.** There is no pipelining or parallel execution within a single worker.\n423\t\n424\t2. **A claimed bead is always released.** Every path through HANDLING releases the bead unless the agent closed it. There is no path where a bead remains claimed after the worker moves to SELECTING.\n425\t\n426\t3. **Heartbeat is continuous.** From BOOTING to STOPPED/ERRORED, the worker emits heartbeats. A gap in heartbeats means the worker is stuck or dead.\n427\t\n428\t4. **Telemetry is emitted for every state transition.** Silent transitions do not exist.\n429\t\n430\t5. **The exclusion set is bounded.** It is cleared on every transition to SELECTING. It cannot grow unboundedly within a selection cycle because max_retries is finite.\n431\t\n432\t6. **Shutdown is always graceful when possible.** SIGTERM triggers STOPPED, not ERRORED. Only SIGKILL causes ungraceful termination, and heartbeat TTL handles that case.\n433\t\n434\t---\n435\t\n436\t# Architecture\n437\t\n438\t## Module Boundaries\n439\t\n440\tNEEDLE is organized into crates (Rust) or packages (Go) with strict dependency rules. No circular dependencies. Each module has a single responsibility.\n441\t\n442\t```\n443\tneedle (binary)\n444\t├── cli/              CLI parsing, session management\n445\t├── worker/           Worker loop, state machine\n446\t├── strand/           Strand waterfall evaluation\n447\t│   └── splice/       Worker failure documentation\n448\t├── claim/            Atomic claiming, lock management\n449\t├── prompt/           Prompt construction from bead context\n450\t├── dispatch/         Agent adapter loading, process execution\n451\t├── outcome/          Exit code classification, outcome handlers\n452\t├── commit_hook/      Bead-Id trailer injection for git commits\n453\t├── telemetry/        Structured event emission, sinks\n454\t├── health/           Heartbeat, stuck detection, peer monitoring\n455\t├── config/           Hierarchical configuration loading\n456\t├── bead_store/       Abstract bead backend interface\n457\t└── types/            Shared types, error definitions\n458\t```\n459\t\n460\t### Dependency Graph\n461\t\n462\t```\n463\tcli ──► worker ──► strand ──► bead_store\n464\t                │           │\n465\t                │           └──► splice ──► bead_store\n466\t                │                               ├──► telemetry\n467\t                │                               └──► health\n468\t                │\n469\t                ├──► claim ─┘\n470\t                │\n471\t                ├──► prompt ──► bead_store\n472\t                │\n473\t                ├──► dispatch\n474\t                │\n475\t                ├──► outcome ──► bead_store\n476\t                │               ├──► telemetry\n477\t                │               └──► health\n478\t                │\n479\t                ├──► commit_hook ──► types\n480\t                │\n481\t                ├──► telemetry\n482\t                │\n483\t                └──► health ──► telemetry\n484\t\n485\tconfig ◄── (all modules)\n486\ttypes  ◄── (all modules)\n487\t```\n488\t\n489\t**Rule:** Arrows point from dependent to dependency. No module depends on `cli` or `worker` except through the binary entry point. `telemetry`, `config`, and `types` are leaf dependencies available to all modules.\n490\t\n491\t## Data Flow\n492\t\n493\t### Primary Loop\n494\t\n495\t```\n496\tbead_store ──[candidates]──► strand ──[bead_id]──► claim ──[claimed_bead]──►\n497\tprompt ──[prompt_string]──► dispatch ──[process]──► worker(wait) ──►\n498\toutcome ──[result]──► bead_store + telemetry\n499\t```\n500\t\n501\t### Telemetry Flow\n502\t\n503\t```\n504\t                    ┌─────────────────────────┐\n505\t                    │    Telemetry Collector   │\n506\t                    └────────────┬────────────┘\n507\t                                 │\n508\t              ┌──────────────────┼──────────────────┐\n509\t              ▼                  ▼                   ▼\n510\t        ┌──────────┐     ┌────────────┐      ┌──────────┐\n511\t        │ File Sink│     │ Stdout Sink│      │ Hook Sink│\n512\t        │ (JSONL)  │     │ (human)    │      │ (webhook)│\n513\t        └──────────┘     └────────────┘      └──────────┘\n514\t```\n515\t\n516\t### Configuration Flow\n517\t\n518\t```\n519\t  CLI args ──► env vars ──► workspace .needle.yaml ──► global ~/.needle/config.yaml ──► defaults\n520\t  (highest)                                                                              (lowest)\n521\t```\n522\t\n523\t## Module Specifications\n524\t\n525\t### bead_store\n526\t\n527\tAbstract interface to any bead backend. The primary implementation wraps the `br` CLI, but the trait allows future backends (direct SQLite, HTTP API, etc.).\n528\t\n529\t```\n530\ttrait BeadStore {\n531\t    fn ready(workspace: &Path, filters: &Filters) -> Result<Vec<Bead>>\n532\t    fn show(id: &BeadId) -> Result<Bead>\n533\t    fn claim(id: &BeadId, actor: &str) -> Result<ClaimResult>\n534\t    fn release(id: &BeadId) -> Result<()>\n535\t    fn labels(id: &BeadId) -> Result<Vec<String>>\n536\t    fn add_label(id: &BeadId, label: &str) -> Result<()>\n537\t    fn doctor_repair() -> Result<RepairReport>\n538\t}\n539\t\n540\tenum ClaimResult {\n541\t    Claimed(Bead),\n542\t    RaceLost { claimed_by: String },\n543\t    NotClaimable { reason: String },\n544\t}\n545\t```\n546\t\n547\t**Design notes:**\n548\t- All methods return `Result`. Silent failures do not exist.\n549\t- `ClaimResult` is an enum, not a boolean. The caller must handle each variant.\n550\t- `ready()` accepts filters (status, assignee, labels, workspace) to push filtering to the backend.\n551\t- The `br` CLI implementation shells out to `br` with `--json` and parses output via `serde_json`.\n552\t- JSON parsing failures are explicit errors, not empty results (learned from starvation false positives).\n553\t\n554\t### claim\n555\t\n556\tWraps `bead_store.claim()` with workspace-level serialization and retry logic.\n557\t\n558\t```\n559\tstruct Claimer {\n560\t    bead_store: Box<dyn BeadStore>,\n561\t    lock_dir: PathBuf,       // per-workspace flock directory\n562\t    max_retries: u32,        // default: 5\n563\t    retry_backoff_ms: u64,   // default: 100\n564\t}\n565\t\n566\timpl Claimer {\n567\t    fn claim_next(\n568\t        &self,\n569\t        candidates: &[Bead],\n570\t        actor: &str,\n571\t        exclusions: &HashSet<BeadId>,\n572\t    ) -> Result<ClaimOutcome>\n573\t}\n574\t\n575\tenum ClaimOutcome {\n576\t    Claimed(Bead),\n577\t    AllRaceLost,\n578\t    NoCandidates,\n579\t    StoreError(Error),\n580\t}\n581\t```\n582\t\n583\t**Design notes:**\n584\t- The flock is per-workspace, not per-bead. This serializes all claim operations within a workspace, preventing thundering herd (learned from `docs/notes/claim-race-conditions.md`).\n585\t- The lock is held only for the duration of the `br update --claim` call, not for the entire bead execution.\n586\t- Retry logic is internal to the Claimer. The caller receives a final `ClaimOutcome`.\n587\t\n588\t### strand\n589\t\n590\tEvaluates the strand waterfall and returns the next action.\n591\t\n592\t```\n593\ttrait Strand {\n594\t    fn name(&self) -> &str\n595\t    fn enabled(&self, config: &Config) -> bool\n596\t    fn evaluate(&self, context: &WorkerContext) -> Result<StrandResult>\n597\t}\n598\t\n599\tenum StrandResult {\n600\t    BeadFound(Vec<Bead>),    // candidates for claiming\n601\t    WorkCreated,              // strand created new beads (e.g., weave)\n602\t    NoWork,                   // fall through to next strand\n603\t    Error(StrandError),       // strand failed, fall through\n604\t}\n605\t```\n606\t\n607\tEach strand implements the trait. The runner evaluates them in order:\n608\t\n609\t```\n610\tfn run_strands(strands: &[Box<dyn Strand>], ctx: &WorkerContext) -> StrandWaterfallResult {\n611\t    for strand in strands {\n612\t        if !strand.enabled(&ctx.config) { continue; }\n613\t        match strand.evaluate(ctx)? {\n614\t            StrandResult::BeadFound(candidates) => return Ok(candidates),\n615\t            StrandResult::WorkCreated => return Ok(/* re-evaluate from strand 1 */),\n616\t            StrandResult::NoWork => continue,\n617\t            StrandResult::Error(e) => { emit_telemetry(e); continue; }\n618\t        }\n619\t    }\n620\t    StrandWaterfallResult::Exhausted\n621\t}\n622\t```\n623\t\n624\t### dispatch\n625\t\n626\tLoads agent adapters and executes the agent process.\n627\t\n628\t```\n629\tstruct Dispatcher {\n630\t    adapters: HashMap<String, AgentAdapter>,\n631\t}\n632\t\n633\tstruct AgentAdapter {\n634\t    name: String,\n635\t    invoke_template: String,   // e.g., \"cd {workspace} && claude --print\"\n636\t    input_method: InputMethod,  // Stdin, File, Args\n637\t    timeout: Duration,\n638\t    environment: HashMap<String, String>,\n639\t}\n640\t\n641\tenum InputMethod {\n642\t    Stdin,                      // pipe prompt to stdin\n643\t    File { path_template: String },  // write prompt to file, pass path\n644\t    Args { flag: String },      // pass prompt as --flag value\n645\t}\n646\t\n647\tstruct ExecutionResult {\n648\t    exit_code: i32,\n649\t    stdout: String,\n650\t    stderr: String,\n651\t    elapsed: Duration,\n652\t    pid: u32,\n653\t}\n654\t```\n655\t\n656\t**Design notes:**\n657\t- Adapters are loaded from YAML config files. Adding a new agent requires only a new YAML file.\n658\t- The invoke template is rendered with variables: `{workspace}`, `{prompt_file}`, `{bead_id}`, `{model}`.\n659\t- The dispatcher does not interpret agent output. It captures raw exit code, stdout, and stderr, then passes them to the outcome handler.\n660\t- Timeout is enforced by the dispatcher, not the agent. If the agent exceeds the timeout, the dispatcher kills the process and returns exit code 124.\n661\t\n662\t### outcome\n663\t\n664\tClassifies the agent's exit and routes to the appropriate handler.\n665\t\n666\t```\n667\tenum Outcome {\n668\t    Success,           // exit 0\n669\t    Failure,           // exit 1\n670\t    Timeout,           // exit 124 (set by dispatcher)\n671\t    Crash(i32),        // exit >128 (signal)\n672\t    AgentNotFound,     // exit 127\n673\t    Interrupted,       // shutdown signal during execution\n674\t}\n675\t\n676\tfn classify(result: &ExecutionResult, was_interrupted: bool) -> Outcome {\n677\t    if was_interrupted { return Outcome::Interrupted; }\n678\t    match result.exit_code {\n679\t        0   => Outcome::Success,\n680\t        1   => Outcome::Failure,\n681\t        124 => Outcome::Timeout,\n682\t        127 => Outcome::AgentNotFound,\n683\t        c if c > 128 => Outcome::Crash(c),\n684\t        _   => Outcome::Failure,  // treat unknown codes as failure\n685\t    }\n686\t}\n687\t```\n688\t\n689\t**Design notes:**\n690\t- The match is exhaustive. Every exit code maps to exactly one outcome.\n691\t- The `Outcome` enum is the sole input to the handler. There is no ad-hoc exit code checking elsewhere.\n692\t- `Outcome::Success` does NOT mean the bead is closed. It means the agent exited cleanly. Bead closure is the agent's responsibility.\n693\t\n694\t### telemetry\n695\t\n696\t```\n697\tfn emit(event: TelemetryEvent)\n698\t\n699\tstruct TelemetryEvent {\n700\t    timestamp: DateTime<Utc>,\n701\t    worker_id: String,\n702\t    event_type: String,       // e.g., \"bead.claim.attempted\"\n703\t    bead_id: Option<BeadId>,\n704\t    workspace: Option<PathBuf>,\n705\t    data: serde_json::Value,  // event-specific payload\n706\t    duration_ms: Option<u64>,\n707\t    trace_id: Option<TraceId>,   // W3C trace ID of enclosing span, if OTLP sink enabled\n708\t    span_id: Option<SpanId>,     // W3C span ID of enclosing span, if OTLP sink enabled\n709\t}\n710\t\n711\ttrait Sink: Send + Sync {\n712\t    fn accept(&self, event: &TelemetryEvent) -> Result<()>;\n713\t    fn flush(&self, deadline: Duration) -> Result<()>;\n714\t}\n715\t\n716\t// Built-in sinks: FileSink, StdoutSink, HookSink, OtlpSink.\n717\t// OtlpSink wraps the OpenTelemetry SDK (traces + metrics + logs providers)\n718\t// and translates TelemetryEvent into the appropriate signal per the\n719\t// Semantic Mapping table in the Telemetry chapter.\n720\t```\n721\t\n722\t### health\n723\t\n724\t```\n725\tstruct HealthMonitor {\n726\t    heartbeat_interval: Duration,    // default: 30s\n727\t    heartbeat_ttl: Duration,         // default: 5min\n728\t    heartbeat_dir: PathBuf,          // ~/.needle/state/heartbeats/\n729\t    peer_check_interval: Duration,   // default: 60s\n730\t}\n731\t\n732\timpl HealthMonitor {\n733\t    fn emit_heartbeat(&self, state: &WorkerState) -> Result<()>\n734\t    fn check_peers(&self) -> Result<Vec<PeerStatus>>\n735\t    fn cleanup_stale_claims(&self, store: &dyn BeadStore) -> Result<u32>\n736\t}\n737\t\n738\tenum PeerStatus {\n739\t    Alive { last_seen: DateTime<Utc>, current_bead: Option<BeadId> },\n740\t    Stale { last_seen: DateTime<Utc>, claimed_bead: Option<BeadId> },\n741\t    Dead { heartbeat_file: PathBuf },\n742\t}\n743\t```\n744\t\n745\t### commit_hook\n746\t\n747\tInjects `Bead-Id:` trailers into git commits after successful bead closure, for HOOP bead_commit_index integration.\n748\t\n749\t```\n750\tasync fn inject_bead_id_trailer(\n751\t    workspace: &Path,\n752\t    bead_id: &BeadId,\n753\t    pre_dispatch_head: &str,\n754\t) -> Result<()>\n755\t\n756\tfn git_head(workspace: &str) -> Result<String>\n757\t```\n758\t\n759\t**Functionality:**\n760\t- When a bead closes with a commit artifact (agent made commits), NEEDLE amends the latest commit to include a `Bead-Id: <id>` trailer\n761\t- Only acts when HEAD moved since `pre_dispatch_head` (i.e. the agent made at least one commit)\n762\t- Idempotent: checks if trailer is already present before injecting\n763\t- Returns `Ok(())` in all no-op cases (not a git repo, no new commits, trailer already present)\n764\t\n765\t**Trailer format:**\n766\t```\n767\tBead-Id: nd-a3f8\n768\t```\n769\t\n770\t**Integration context:**\n771\t- HOOP's `bead_commit_index` picks up the trailer via `git log --format=%(trailers:key=Bead-Id,valueonly,separator=,)`\n772\t- Enables bidirectional traceability: beads → commits and commits → beads\n773\t- Executed after successful bead close, before returning to SELECTING state\n774\t\n775\t**Timeouts:**\n776\t- `git rev-parse HEAD`: 10s timeout\n777\t- `git commit --amend`: 30s timeout\n778\t\n779\t**Design notes:**\n780\t- Errors are logged as non-fatal warnings; they do not fail the bead processing cycle\n781\t- The trailer is appended via `git commit --amend --no-edit --trailer \"Bead-Id: <id>\"`\n782\t- Multiple beads can be tracked in a single commit (comma-separated in trailer value)\n783\t\n784\t## Binary Structure\n785\t\n786\tNEEDLE is a single binary with subcommands:\n787\t\n788\t```\n789\tneedle run [--workspace PATH] [--agent NAME] [--count N] [--identifier NAME]\n790\tneedle stop [--all | --identifier NAME]\n791\tneedle list [--format table|json]\n792\tneedle attach <identifier>\n793\tneedle status [--format table|json]\n794\tneedle config [--get KEY | --set KEY VALUE]\n795\tneedle doctor [--repair]\n796\tneedle version\n797\t```\n798\t\n799\t### Session Management\n800\t\n801\t`needle run` creates tmux sessions for each worker. Session naming follows the pattern:\n802\t\n803\t```\n804\tneedle-{agent}-{provider}-{model}-{identifier}\n805\t```\n806\t\n807\tExamples:\n808\t```\n809\tneedle-claude-anthropic-sonnet-alpha\n810\tneedle-opencode-alibaba-qwen-bravo\n811\tneedle-codex-openai-gpt4-charlie\n812\t```\n813\t\n814\t`--count=N` launches N workers with sequential NATO alphabet identifiers (alpha, bravo, charlie, ...). Workers are launched with staggered delay (default: 2s between launches) to prevent thundering herd on startup (learned from `docs/notes/operational-fleet-lessons.md`).\n815\t\n816\t### CLI Help System\n817\t\n818\tEvery subcommand and flag is discoverable via `--help` or `-h`. Help text is embedded in the binary and generated from the same source as the CLI parser (e.g., `clap` derive macros in Rust).\n819\t\n820\t**Top-level help:**\n821\t\n822\t```\n823\t$ needle --help\n824\t\n825\tNEEDLE — Navigates Every Enqueued Deliverable, Logs Effort\n826\t\n827\tDeterministic bead processing with explicit outcome paths.\n828\t\n829\tUsage: needle <COMMAND>\n830\t\n831\tCommands:\n832\t  run          Launch worker(s) to process beads\n833\t  stop         Stop running worker(s)\n834\t  list         List active workers\n835\t  attach       Attach to a worker's tmux session\n836\t  status       Show fleet status, bead counts, and cost summary\n837\t  config       View or modify configuration\n838\t  doctor       Check system health and repair\n839\t  test-agent   Validate an agent adapter\n840\t  logs         Query telemetry logs\n841\t  rollback     Roll back to previous stable binary\n842\t  version      Show version information\n843\t  help         Print this message or the help of a subcommand\n844\t\n845\tOptions:\n846\t  -h, --help     Print help\n847\t  -V, --version  Print version\n848\t```\n849\t\n850\t**Subcommand help (example):**\n851\t\n852\t```\n853\t$ needle run --help\n854\t\n855\tLaunch worker(s) to process beads\n856\t\n857\tUsage: needle run [OPTIONS]\n858\t\n859\tOptions:\n860\t  -w, --workspace <PATH>     Workspace to process beads from [default: config value]\n861\t  -a, --agent <NAME>         Agent adapter to use [default: config value]\n862\t  -c, --count <N>            Number of workers to launch [default: 1]\n863\t  -i, --identifier <NAME>    Worker identifier (overrides NATO naming)\n864\t  -t, --timeout <SECONDS>    Agent execution timeout [default: config value]\n865\t      --resume               Resume an existing worker session (used by hot-reload)\n866\t  -h, --help                 Print help\n867\t```\n868\t\n869\t**Design notes:**\n870\t- Every flag has a one-line description\n871\t- Default values shown in brackets (sourced from config)\n872\t- Subcommand grouping follows the lifecycle: launch → monitor → operate → maintain\n873\t- `needle help <command>` and `needle <command> --help` are equivalent\n874\t- Help output is plain text, no colors, suitable for piping to other tools or agents\n875\t\n876\t---\n877\t\n878\t# Strand Waterfall\n879\t\n880\tStrands are NEEDLE's strategy for finding work. They are evaluated in strict sequence — the first strand that yields actionable work wins. When a strand returns `NoWork`, the worker falls through to the next.\n881\t\n882\tThe waterfall is the answer to \"what does a worker do when it has no beads?\" It is not a priority system for beads (that's handled by deterministic ordering within each strand). It is a priority system for *strategies*.\n883\t\n884\t## Waterfall Sequence\n885\t\n886\t```\n887\t  Strand 1: PLUCK ──── primary work from assigned workspace\n888\t       │ no work\n889\t       ▼\n890\t  Strand 2: MEND ───── cleanup: stale claims, orphaned locks, health\n891\t       │ nothing to clean\n892\t       ▼\n893\t  Strand 3: EXPLORE ── look for work in other configured workspaces\n894\t       │ no work\n895\t       ▼\n896\t  Strand 4: WEAVE ──── create beads from documentation gaps (opt-in)\n897\t       │ no gaps or disabled\n898\t       ▼\n899\t  Strand 5: UNRAVEL ── propose alternatives for HUMAN-blocked beads (opt-in)\n900\t       │ none or disabled\n901\t       ▼\n902\t  Strand 6: PULSE ──── codebase health scan, auto-generate beads (opt-in)\n903\t       │ no issues or disabled\n904\t       ▼\n905\t  Strand 7: REFLECT ── consolidate learnings from recent beads\n906\t       │ consolidation complete or not needed\n907\t       ▼\n908\t  Strand 8: SPLICE ──── worker failure documentation\n909\t       │ no failures\n910\t       ▼\n911\t  Strand 9: KNOT ───── alert human, enter backoff\n912\t       │\n913\t       ▼\n914\t  → EXHAUSTED (backoff and retry from Strand 1)\n915\t```\n916\t\n917\t## Strand 1: Pluck\n918\t\n919\t**Purpose:** Process beads from the worker's assigned workspace. This is the primary work strand and will handle >90% of all bead processing.\n920\t\n921\t**Invokes agent:** Yes.\n922\t\n923\t**Entry condition:** Worker has an assigned workspace with a `.beads/` directory.\n924\t\n925\t**Algorithm:**\n926\t1. Query bead store: `br ready --unassigned --json` in workspace\n927\t2. Filter: exclude beads with labels `deferred`, `human`, `blocked`\n928\t3. Filter: exclude beads in the current retry exclusion set\n929\t4. Sort: priority (ascending, 0 = highest), then creation time (ascending, oldest first)\n930\t5. Return sorted candidates for claiming\n931\t\n932\t**Exit conditions:**\n933\t| Result | Action |\n934\t|--------|--------|\n935\t| Candidates found | Return `BeadFound(candidates)` → worker proceeds to CLAIMING |\n936\t| No candidates (queue empty) | Return `NoWork` → fall through to Strand 2 |\n937\t| Bead store error | Emit telemetry, return `Error` → fall through to Strand 2 |\n938\t\n939\t**Determinism guarantee:** The sort key `(priority, created_at)` produces the same ordering for all workers viewing the same queue state. Workers will compete for the same top-priority bead, and the claim mechanism resolves contention.\n940\t\n941\t## Strand 2: Mend\n942\t\n943\t**Purpose:** Maintenance and cleanup operations that keep the bead store healthy. Runs before Explore because cleaning up stale claims or broken dependencies in the home workspace may unblock beads here — no need to roam if local work is just stuck.\n944\t\n945\t**Invokes agent:** No.\n946\t\n947\t**Entry condition:** Strand 1 returned no work.\n948\t\n949\t**Algorithm:**\n950\t1. **Stale claim cleanup:** Find beads with status `in_progress` where the assigned worker has no active heartbeat (TTL expired). Release them.\n951\t2. **Orphaned lock cleanup:** Find workspace lock files older than TTL. Remove them.\n952\t3. **Dependency cleanup:** Find closed beads that are still listed as blockers on open beads. Remove the stale dependency links.\n953\t4. **Database health:** Run `br doctor` (not `--repair` unless errors found).\n954\t\n955\t**Exit conditions:**\n956\t| Result | Action |\n957\t|--------|--------|\n958\t| Cleanup performed | Return `WorkCreated` → restart from Strand 1 (released beads may now be claimable) |\n959\t| Nothing to clean | Return `NoWork` → fall through to Strand 3 |\n960\t\n961\t**Design notes (from `docs/notes/bead-lifecycle-bugs.md`):**\n962\t- Stale dependency links caused permanent blocking in NEEDLE-deprecated. Mend must clean these.\n963\t- Distinguish \"did work\" from \"found nothing\" — v1 had an infinite loop where mend returned success on failed releases.\n964\t\n965\t## Strand 3: Explore\n966\t\n967\t**Purpose:** Discover work in other configured workspaces when the home workspace is empty and clean.\n968\t\n969\t**Invokes agent:** No. Explore only finds candidates — execution happens back through the standard CLAIMING → DISPATCHING flow.\n970\t\n971\t**Entry condition:** Strands 1-2 returned no work. Explore is enabled in config. At least one additional workspace is configured.\n972\t\n973\t**Algorithm:**\n974\t1. Read configured workspace list from config (explicit paths, no filesystem scanning)\n975\t2. For each workspace (in configured order):\n976\t   a. Check `.beads/` directory exists\n977\t   b. Query `br ready --unassigned --json`\n978\t   c. If candidates found, return them with workspace context\n979\t3. If no workspace has work, return `NoWork`\n980\t\n981\t**Exit conditions:**\n982\t| Result | Action |\n983\t|--------|--------|\n984\t| Candidates found in another workspace | Return `BeadFound(candidates)` with workspace override |\n985\t| No candidates in any workspace | Return `NoWork` → fall through to Strand 4 |\n986\t\n987\t**Design notes (from `docs/notes/explore-strand-bugs.md`):**\n988\t- **No filesystem scanning.** NEEDLE-deprecated's `find`-based discovery caused 35+ CPU load with 40 workers. Workspaces must be explicitly configured.\n989\t- **No upward traversal.** The v1 explore strand walked up parent directories to `/home`, then `/`. This is eliminated.\n990\t- **Workspace list is static** for the duration of a session. It is read from config at boot and not re-evaluated.\n991\t- **Workers do not permanently relocate.** If a worker finds work in another workspace, it processes that bead and returns to its home workspace for the next cycle.\n992\t\n993\t## Strand 4: Weave (opt-in)\n994\t\n995\t**Purpose:** Analyze workspace documentation for gaps and create new beads to address them.\n996\t\n997\t**Invokes agent:** Yes — uses the agent to analyze documentation and propose beads.\n998\t\n999\t**Entry condition:** Strands 1-3 (Pluck, Mend, Explore) returned no work. Weave is explicitly enabled in workspace config (`strands.weave.enabled: true`).\n1000\t\n1001\t**Algorithm:**\n1002\t1. Identify documentation files (README, AGENTS.md, docs/, etc.)\n1003\t2. Dispatch agent with gap-analysis prompt\n1004\t3. Agent proposes new beads (as structured output)\n1005\t4. Create beads via bead store\n1006\t5. Return `WorkCreated` → restart from Strand 1\n1007\t\n1008\t**Guardrails (from `docs/notes/self-modification-risks.md`):**\n1009\t- **Max beads per weave run:** Configurable, default 5. Prevents unbounded bead creation.\n1010\t- **Cooldown period:** Minimum time between weave runs per workspace, default 24h.\n1011\t- **Seen-issues deduplication:** Track previously created weave beads to prevent duplicates.\n1012\t- **Workspace exclusion:** Weave is disabled for NEEDLE's own workspace by default. Workers must not create work for their own orchestrator without human approval.\n1013\t- **Human review label:** Weave-created beads are labeled `weave-generated` for easy filtering.\n1014\t\n1015\t**Exit conditions:**\n1016\t| Result | Action |\n1017\t|--------|--------|\n1018\t| Beads created | Return `WorkCreated` → restart from Strand 1 |\n1019\t| No gaps found | Return `NoWork` → fall through to Strand 5 |\n1020\t| Disabled | Return `NoWork` → fall through to Strand 5 |\n1021\t\n1022\t## Strand 5: Unravel (opt-in)\n1023\t\n1024\t**Purpose:** For beads labeled `human` (requiring human decision), propose alternative approaches that an agent could execute instead.\n1025\t\n1026\t**Invokes agent:** Yes — uses the agent to analyze the blocked bead and propose workarounds.\n1027\t\n1028\t**Entry condition:** Strands 1-4 returned no work. Unravel is explicitly enabled. There are beads with `human` label in the workspace.\n1029\t\n1030\t**Algorithm:**\n1031\t1. Query beads with `human` label\n1032\t2. For each (up to `max_unravel_per_run`, default 3):\n1033\t   a. Dispatch agent with the bead context and a prompt asking for alternative approaches\n1034\t   b. If agent proposes viable alternatives, create child beads with `alternative` label\n1035\t   c. Do NOT close or modify the original `human` bead\n1036\t3. Return `WorkCreated` if alternatives were created\n1037\t\n1038\t**Guardrails:**\n1039\t- Original `human` bead is never modified or closed\n1040\t- Alternative beads are linked as children (informational, not blocking)\n1041\t- Max alternatives per `human` bead: configurable, default 2\n1042\t- Cooldown: don't re-analyze a `human` bead that was analyzed within the last 7 days\n1043\t\n1044\t**Exit conditions:**\n1045\t| Result | Action |\n1046\t|--------|--------|\n1047\t| Alternatives created | Return `WorkCreated` → restart from Strand 1 |\n1048\t| No `human` beads or no alternatives viable | Return `NoWork` → fall through to Strand 6 |\n1049\t| Disabled | Return `NoWork` → fall through to Strand 6 |\n1050\t\n1051\t## Strand 6: Pulse (opt-in)\n1052\t\n1053\t**Purpose:** Scan the codebase for health issues (stale TODOs, missing tests, dependency drift, linting) and create beads for significant findings.\n1054\t\n1055\t**Invokes agent:** Yes — uses the agent (or external tools) to scan the codebase.\n1056\t\n1057\t**Entry condition:** Strands 1-5 returned no work. Pulse is explicitly enabled. Cooldown has expired.\n1058\t\n1059\t**Algorithm:**\n1060\t1. Run configured scanners (linters, test coverage, dependency checkers, TODO scanners)\n1061\t2. Compare results against previous scan (stored in `~/.needle/state/pulse/`)\n1062\t3. For new issues exceeding severity threshold, create beads\n1063\t4. Update last-scan state\n1064\t\n1065\t**Guardrails:**\n1066\t- **Max beads per pulse run:** Configurable, default 10\n1067\t- **Cooldown:** Default 48h between scans\n1068\t- **Severity threshold:** Only create beads for issues above configured severity\n1069\t- **Deduplication:** Track seen issues to prevent duplicate beads across scans\n1070\t- **Workspace exclusion:** Same as Weave — disabled for NEEDLE's own workspace by default\n1071\t\n1072\t**Exit conditions:**\n1073\t| Result | Action |\n1074\t|--------|--------|\n1075\t| Beads created | Return `WorkCreated` → restart from Strand 1 |\n1076\t| No new issues | Return `NoWork` → fall through to Strand 7 |\n1077\t| Disabled | Return `NoWork` → fall through to Strand 7 |\n1078\t\n1079\t## Strand 7: Reflect (opt-in)\n1080\t\n1081\t**Purpose:** Consolidate learnings from recent bead work into a shared knowledge base (`.beads/learnings.md`), promoting recurring patterns to reusable skill files. This meta-analysis strand ensures that insights from completed work are captured and made available to future work.\n1082\t\n1083\t**Invokes agent:** Yes — uses a consolidation-specific prompt.\n1084\t\n1085\t**Entry condition:** Strands 1-6 returned no work. Reflect is explicitly enabled in workspace config (`strands.reflect.enabled: true`). At least N beads have been closed since last consolidation (configurable, default: 10). At least T hours since last consolidation (configurable, default: 24).\n1086\t\n1087\t**Algorithm (KAIROS-inspired four-phase cycle):**\n1088\t\n1089\t1. **Orient:** Read current `.beads/learnings.md` and existing skill files in `.beads/skills/`. Check file sizes to ensure they're within bounds.\n1090\t2. **Gather:** Read bead close bodies from `.beads/issues.jsonl` for beads closed since last consolidation. Read available traces for failed beads to capture failure patterns.\n1091\t3. **Consolidate:**\n1092\t   - Extract retrospective blocks from close bodies\n1093\t   - Identify patterns across multiple beads (same failure mode, same codebase quirk, workaround that works)\n1094\t   - Merge new learnings into `.beads/learnings.md`, deduplicating against existing entries\n1095\t   - Convert relative references to absolute (bead IDs, dates)\n1096\t   - If a learning appears 3+ times across different beads, promote to a skill file in `.beads/skills/`\n1097\t   - If a learning contradicts an existing entry, resolve in favor of the newer evidence\n1098\t4. **Prune:**\n1099\t   - Remove entries older than 90 days without reinforcement\n1100\t   - Compress similar entries into single entries\n1101\t   - Ensure total learnings stay under 80 entries (configurable)\n1102\t\n1103\t**Guardrails:**\n1104\t- **Cooldown:** Minimum 24 hours between consolidation runs (configurable)\n1105\t- **Max learnings created per run:** 10 (configurable)\n1106\t- **Max skills promoted per run:** 3 (configurable)\n1107\t- **Read-only on CLAUDE.md:** The consolidation agent receives the workspace CLAUDE.md as context but MUST NOT modify it. CLAUDE.md changes require explicit human approval.\n1108\t- **Workspace exclusion:** Reflect is disabled for NEEDLE's own workspace by default. Workers must not modify their own orchestrator's knowledge base without human approval.\n1109\t\n1110\t**Exit conditions:**\n1111\t| Result | Action |\n1112\t|--------|--------|\n1113\t| Consolidation performed | Return `WorkCreated` → restart from Strand 1 (learnings may unblock new work) |\n1114\t| Not enough data since last run | Return `NoWork` → fall through to Strand 8 |\n1115\t| Disabled or cooldown active | Return `NoWork` → fall through to Strand 8 |\n1116\t\n1117\t**Telemetry:**\n1118\t| Event Type | Emitted When | Data Fields |\n1119\t|------------|-------------|-------------|\n1120\t| `reflect.started` | Consolidation starts | `beads_since_last`, `current_learnings_count` |\n1121\t| `reflect.consolidated` | Consolidation completes | `learnings_added`, `learnings_pruned`, `skills_promoted`, `contradictions_resolved` |\n1122\t| `reflect.skipped` | Consolidation skipped | `reason` (cooldown, insufficient data, disabled) |\n1123\t\n1124\t**Learning persistence:** `.beads/learnings.md` is the authoritative source. Workers automatically append it to `context_files` during prompt building (via the Config module's `context_files` discovery). No manual config required — workers always see the latest learnings.\n1125\t\n1126\t**Session transcript analysis:** Reflect analyzes both bead close bodies (structured outcomes) and Claude Code session transcripts (decision-making process) when available. Transcripts are stored as JSONL in `.claude/projects/<project-hash>/<session-uuid>.jsonl` and contain richer signal: failed attempts, tool call sequences, recovery strategies, and decision points.\n1127\t\n1128\t**Integration with prompt building:** If `.beads/learnings.md` exists in a workspace, NEEDLE automatically appends it to `context_files` during prompt building. Workers always see the latest learnings without manual configuration.\n1129\t\n1130\t## Strand 8: Splice\n1131\t\n1132\t**Purpose:** Document worker failures (crashed workers and live-but-looping workers) by creating failure beads in a configured report workspace.\n1133\t\n1134\t**Invokes agent:** No.\n1135\t\n1136\t**Entry condition:** Strand 7 returned no work. Splice is enabled in config (default: true). Heartbeat files exist in the heartbeat directory.\n1137\t\n1138\t**Algorithm:**\n1139\t\n1140\t1. **Scan for dead workers (stale heartbeat + dead tmux session):**\n1141\t   - Read all heartbeat files from the heartbeat directory\n1142\t   - For each heartbeat older than `stale_threshold_secs` (default: 300s):\n1143\t     - Check if the tmux session is still alive\n1144\t     - If session is dead, this is a failed worker\n1145\t\n1146\t2. **Scan for live-but-looping workers (optional, when `detect_live_loops: true`):**\n1147\t   - For each worker with a fresh heartbeat:\n1148\t     - Read the tail of their JSONL log file\n1149\t     - Detect three loop patterns:\n1150\t       - **Claim churn:** Repeated `bead.claim.race_lost` events for the same bead\n1151\t       - **State ping-pong:** Rapid cycling between a small set of states without forward progress\n1152\t       - **Log runaway:** Excessive JSONL growth without `agent.completed` events\n1153\t\n1154\t3. **Create failure beads:**\n1155\t   - For each undocumented failure or loop pattern:\n1156\t     - Create a bead in the configured `report_workspace`\n1157\t     - Include worker details, session info, and evidence in the bead body\n1158\t   - Track documented sessions/loops in `splice_state.json` to prevent duplicates\n1159\t\n1160\t4. **Return `WorkCreated` if any beads were created, otherwise `NoWork`**\n1161\t\n1162\t**Exit conditions:**\n1163\t| Result | Action |\n1164\t|--------|--------|\n1165\t| Failure beads created | Return `WorkCreated` → restart from Strand 1 |\n1166\t| No new failures detected | Return `NoWork` → fall through to Strand 9 |\n1167\t\n1168\t**State persistence:** `splice_state.json` tracks which session IDs and loop patterns have already been documented, preventing duplicate failure beads for the same dead/looping worker.\n1169\t\n1170\t**Loop detection thresholds:**\n1171\t- `claim_churn_threshold`: Number of race-lost events for same bead before flagging (default: 20)\n1172\t- `log_runaway_bytes`: Max JSONL growth in `live_loop_window_secs` without completion (default: 10 MiB)\n1173\t- `live_loop_window_secs`: Time window for log runaway check (default: 300s)\n1174\t\n1175\t## Strand 9: Knot\n1176\t\n1177\t**Purpose:** All work-finding strategies are exhausted. Alert the human and enter backoff.\n1178\t\n1179\t**Invokes agent:** No.\n1180\t\n1181\t**Entry condition:** Strands 1-8 all returned `NoWork`.\n1182\t\n1183\t**Algorithm:**\n1184\t1. Determine alert state:\n1185\t   - **First time exhausted:** Emit `worker.idle` telemetry. Start backoff timer.\n1186\t   - **Repeated exhaustion (>N cycles):** Create alert bead (if not already created within cooldown).\n1187\t2. Verify before alerting (three-state check):\n1188\t   a. **No beads exist:** Queue is genuinely empty. Normal idle.\n1189\t   b. **All beads claimed:** Other workers are busy. Normal contention. Wait.\n1190\t   c. **Beads invisible:** Configuration error (wrong workspace, broken filter). Alert.\n1191\t3. Return `NoWork` → worker enters EXHAUSTED state with backoff\n1192\t\n1193\t**Guardrails (from `docs/notes/worker-starvation-lessons.md`):**\n1194\t- **Verify independently before alerting.** The v1 system had 100% false positive rate because it used the same broken code path for verification.\n1195\t- **Three-state model.** \"No work\" is three different conditions with different responses. Conflating them caused the false positive spiral.\n1196\t- **Rate limit alerts:** Max 1 alert bead per workspace per hour.\n1197\t- **Alert includes diagnostics:** Bead counts, worker count, claimed count, config snapshot.\n1198\t\n1199\t**Exit conditions:**\n1200\t| Result | Action |\n1201\t|--------|--------|\n1202\t| Always | Return `NoWork` → EXHAUSTED state |\n1203\t\n1204\t## Strand Configuration\n1205\t\n1206\t```yaml\n1207\t# ~/.needle/config.yaml or .needle.yaml\n1208\tstrands:\n1209\t  pluck:\n1210\t    enabled: true           # always on, cannot be disabled\n1211\t  explore:\n1212\t    enabled: true\n1213\t    workspaces:             # explicit list, no auto-discovery\n1214\t      - /home/coder/project-a\n1215\t      - /home/coder/project-b\n1216\t  mend:\n1217\t    enabled: true\n1218\t    stale_claim_ttl: 300    # seconds before a claimed bead is considered stale\n1219\t    lock_ttl: 600           # seconds before an orphaned lock is removed\n1220\t  weave:\n1221\t    enabled: false          # opt-in\n1222\t    max_beads_per_run: 5\n1223\t    cooldown_hours: 24\n1224\t    exclude_workspaces: []  # workspaces where weave is forbidden\n1225\t  unravel:\n1226\t    enabled: false          # opt-in\n1227\t    max_per_run: 3\n1228\t    cooldown_days: 7\n1229\t  pulse:\n1230\t    enabled: false          # opt-in\n1231\t    max_beads_per_run: 10\n1232\t    cooldown_hours: 48\n1233\t    severity_threshold: warning\n1234\t    scanners:\n1235\t      - name: todo-scanner\n1236\t        command: \"grep -rn 'TODO\\\\|FIXME' {workspace}/src\"\n1237\t      - name: test-coverage\n1238\t        command: \"cargo tarpaulin --skip-clean -o json\"\n1239\t  reflect:\n1240\t    enabled: true           # on by default (unlike weave/unravel/pulse)\n1241\t    min_beads_since_last: 10   # minimum closed beads before consolidation\n1242\t    cooldown_hours: 24\n1243\t    max_learnings_per_run: 10\n1244\t    max_skills_per_run: 3\n1245\t    learning_retention_days: 90\n1246\t    max_learnings: 80\n1247\t  splice:\n1248\t    enabled: true           # always on, cannot be disabled\n1249\t    stale_threshold_secs: 300   # seconds before heartbeat considered stale\n1250\t    report_workspace: null      # workspace for failure beads (null = current store)\n1251\t    detect_live_loops: true     # scan for stuck workers in JSONL tail\n1252\t    live_loop_scan_events: 200  # max events to scan per worker\n1253\t    claim_churn_threshold: 20   # race-lost events for same bead before flagging\n1254\t    log_runaway_bytes: 10485760 # 10 MiB, max growth without completion\n1255\t    live_loop_window_secs: 300   # time window for log runaway check\n1256\t  knot:\n1257\t    enabled: true           # always on, cannot be disabled\n1258\t    alert_cooldown_minutes: 60\n1259\t    exhaustion_threshold: 3 # cycles before creating alert bead\n1260\t```\n1261\t\n1262\t---\n1263\t\n1264\t# Mitosis\n1265\t\n1266\tMitosis is NEEDLE's mechanism for splitting a bead that represents multiple tasks into smaller, focused child beads. It is triggered on failure — when a bead fails execution, NEEDLE evaluates whether it should be decomposed before retrying.\n1267\t\n1268\t## Split Criteria\n1269\t\n1270\tA bead is splittable when it describes **multiple independent tasks**. This is a semantic determination, not a numeric one. The agent analyzes the bead and answers one question: \"Does this bead ask for more than one independent unit of work?\"\n1271\t\n1272\t**Valid reasons to split:**\n1273\t- The bead describes multiple distinct deliverables (\"add endpoint AND write migration AND update tests\")\n1274\t- The deliverables have a dependency relationship (migration before endpoint)\n1275\t- Each deliverable is independently closable\n1276\t\n1277\t**Not valid reasons to split:**\n1278\t- The bead is long (a single complex task can be long and still atomic)\n1279\t- The bead failed once (failure means the task is hard, not composite)\n1280\t- The bead has many acceptance criteria (criteria validate one task, not separate tasks)\n1281\t\n1282\tIf the agent determines the bead is a single task, mitosis does not apply. The bead is released for retry or deferred.\n1283\t\n1284\t## Child-Aware Deduplication\n1285\t\n1286\tBefore creating any child bead, NEEDLE reads the parent's existing children. If a previous mitosis pass already created children for this parent, the proposed children are compared against them. Matching children are skipped; only novel tasks are created.\n1287\t\n1288\t```\n1289\tBead fails\n1290\t    │\n1291\t    ▼\n1292\tAgent analyzes: \"Multiple independent tasks?\"\n1293\t    │\n1294\t    ├── No → Release for retry or defer\n1295\t    │\n1296\t    └── Yes → Propose N children with dependencies\n1297\t                │\n1298\t                ▼\n1299\t          Read parent's existing children\n1300\t          (br show <parent> --json → dependencies)\n1301\t                │\n1302\t          For each proposed child:\n1303\t                │\n1304\t                ├── Parent already has a child covering this? → Skip\n1305\t                │\n1306\t                └── Novel task → Create child, link as blocking parent\n1307\t\n1308\t          If any children created:\n1309\t                └── Parent remains in_progress, blocked by children\n1310\t          If all children already existed:\n1311\t                └── No-op (split already happened)\n1312\t```\n1313\t\n1314\tThis makes duplicate splits structurally impossible. The parent's child list is the single source of truth. A second worker encountering the same parent sees the existing children and creates nothing new.\n1315\t\n1316\t## Concurrency Safety\n1317\t\n1318\tMitosis uses the same per-workspace flock as the claiming protocol. The flock is held for the entire mitosis operation: read existing children → create new children → update parent dependencies. This serializes mitosis across workers within a workspace.\n1319\t\n1320\tIf two workers both hold a failed bead and attempt mitosis on the same parent simultaneously, the flock ensures one completes first. The second worker enters the flock, reads the children just created by the first, and skips all proposed children as duplicates.\n1321\t\n1322\t## When Mitosis Runs\n1323\t\n1324\tMitosis is evaluated in the HANDLING state when the outcome is **Failure** (exit code 1):\n1325\t\n1326\t1. Check if mitosis is enabled for the workspace (configurable, default: true)\n1327\t2. Check if this is the bead's **first failure** (mitosis runs once, not on every retry)\n1328\t3. Acquire workspace flock\n1329\t4. Dispatch agent with mitosis analysis prompt: bead context + \"Does this describe multiple tasks?\"\n1330\t5. If agent proposes children:\n1331\t   a. Read parent's existing children\n1332\t   b. Create only novel children with appropriate dependencies\n1333\t   c. Parent is blocked by children (remains claimed, status changes to blocked)\n1334\t6. Release workspace flock\n1335\t7. Emit `bead.mitosis` telemetry (children proposed, children created, children skipped)\n1336\t\n1337\tIf mitosis produces children, the parent is not released — it is blocked until its children complete. When all children are closed, the parent becomes unblocked and re-enters the queue for a final pass (or the mend strand clears the stale dependency and it resolves naturally).\n1338\t\n1339\tIf mitosis determines the bead is a single task, normal failure handling applies: release and increment failure count.\n1340\t\n1341\t## Mitosis Configuration\n1342\t\n1343\t```yaml\n1344\t# ~/.needle/config.yaml or .needle.yaml\n1345\tmitosis:\n1346\t  enabled: true                # enable/disable per workspace\n1347\t  first_failure_only: true     # only evaluate on first failure, not retries\n1348\t```\n1349\t\n1350\t## Telemetry\n1351\t\n1352\t| Event Type | Emitted When | Data Fields |\n1353\t|------------|-------------|-------------|\n1354\t| `bead.mitosis.evaluated` | Agent analyzed bead for splitting | `bead_id`, `splittable` (bool), `proposed_children` (count) |\n1355\t| `bead.mitosis.split` | Children created | `parent_id`, `children_created` (count), `children_skipped` (count), `child_ids` |\n1356\t| `bead.mitosis.skipped` | All proposed children already exist | `parent_id`, `existing_children` (count) |\n1357\t\n1358\t---\n1359\t\n1360\t# Concurrency\n1361\t\n1362\tMultiple NEEDLE workers operate in the same environment simultaneously. This section specifies how they coordinate without a central orchestrator.\n1363\t\n1364\t## Coordination Model\n1365\t\n1366\tNEEDLE uses **decentralized coordination through shared state**. There is no coordinator process, no leader election, no message passing between workers. All coordination happens through:\n1367\t\n1368\t1. **Atomic bead claims** (SQLite transactions via `br update --claim`)\n1369\t2. **Workspace-level flock** (POSIX file locks for claim serialization)\n1370\t3. **File-based heartbeats** (health monitoring and stale detection)\n1371\t4. **Worker state registry** (shared JSON file for fleet awareness)\n1372\t\n1373\tThis is approach #1 (SQLite transactions) from `docs/research/concurrency-approaches-compared.md`, augmented with file-based serialization to address the thundering herd problem.\n1374\t\n1375\t## Claiming Protocol\n1376\t\n1377\t### The Thundering Herd Problem\n1378\t\n1379\tWithout serialization, all workers compute the same priority ordering and race to claim the same top bead. N-1 workers lose, retry, compute the same ordering again, and race for the second bead. This wastes O(N^2) claim attempts.\n1380\t\n1381\t### Solution: Per-Workspace Flock\n1382\t\n1383\t```\n1384\t┌─────────────┐      ┌─────────────┐      ┌─────────────┐\n1385\t│  Worker A    │      │  Worker B    │      │  Worker C    │\n1386\t│  SELECT bead │      │  SELECT bead │      │  SELECT bead │\n1387\t└──────┬──────┘      └──────┬──────┘      └──────┬──────┘\n1388\t       │                     │                     │\n1389\t       ▼                     ▼                     ▼\n1390\t   ┌───────────────────────────────────────────────────┐\n1391\t   │          flock(/tmp/needle-claim-<workspace>.lock) │\n1392\t   │                                                    │\n1393\t   │  A enters ─► claim bead-1 ─► success ─► release   │\n1394\t   │  B enters ─► claim bead-2 ─► success ─► release   │\n1395\t   │  C enters ─► claim bead-3 ─► success ─► release   │\n1396\t   └───────────────────────────────────────────────────┘\n1397\t```\n1398\t\n1399\t**Protocol:**\n1400\t\n1401\t1. Worker computes candidate list (deterministic ordering)\n1402\t2. Worker acquires flock on workspace lock file (blocking, with timeout)\n1403\t3. Worker verifies top candidate is still claimable\n1404\t4. Worker executes `br update <id> --claim --actor <worker-id>`\n1405\t5. Worker releases flock\n1406\t6. If claim failed (race with non-NEEDLE claimer), retry with next candidate\n1407\t\n1408\t**Lock file path:** `/tmp/needle-claim-{workspace_hash}.lock` where `workspace_hash` is a deterministic hash of the workspace absolute path.\n1409\t\n1410\t**Lock timeout:** 10 seconds. If the lock cannot be acquired within this time, the worker skips this workspace and moves to the next strand.\n1411\t\n1412\t**Lock scope:** The lock is held only during the claim attempt (steps 2-5), not during bead execution. This means the lock is held for milliseconds, not minutes.\n1413\t\n1414\t## Heartbeat Protocol\n1415\t\n1416\tEvery worker emits a heartbeat file to enable peer monitoring and stale claim detection.\n1417\t\n1418\t### Heartbeat File\n1419\t\n1420\t```\n1421\t~/.needle/state/heartbeats/<worker-id>.json\n1422\t```\n1423\t\n1424\tContents:\n1425\t\n1426\t```json\n1427\t{\n1428\t  \"worker_id\": \"needle-claude-anthropic-sonnet-alpha\",\n1429\t  \"pid\": 12345,\n1430\t  \"state\": \"EXECUTING\",\n1431\t  \"current_bead\": \"nd-a3f8\",\n1432\t  \"workspace\": \"/home/coder/project\",\n1433\t  \"last_heartbeat\": \"2026-03-20T15:30:00Z\",\n1434\t  \"started_at\": \"2026-03-20T14:00:00Z\",\n1435\t  \"beads_processed\": 7,\n1436\t  \"session\": \"needle-claude-anthropic-sonnet-alpha\"\n1437\t}\n1438\t```\n1439\t\n1440\t### Emission\n1441\t\n1442\t- Heartbeat is emitted every `heartbeat_interval` (default: 30 seconds)\n1443\t- Emitted from a dedicated thread/task, independent of the main worker loop\n1444\t- Updates `last_heartbeat` timestamp and `state` field\n1445\t- File write is atomic (write to temp file, rename)\n1446\t\n1447\t### TTL and Stale Detection\n1448\t\n1449\tA heartbeat is **stale** if `now - last_heartbeat > heartbeat_ttl` (default: 5 minutes).\n1450\t\n1451\tA stale heartbeat means the worker has stopped updating — it has crashed, hung, or been killed.\n1452\t\n1453\t### Peer Monitoring\n1454\t\n1455\tThe Mend strand (Strand 2) checks peer heartbeats:\n1456\t\n1457\t1. Read all heartbeat files in `~/.needle/state/heartbeats/`\n1458\t2. For each stale heartbeat:\n1459\t   a. Check if the PID is still alive (`kill -0 <pid>`)\n1460\t   b. If PID is dead: worker crashed. Clean up.\n1461\t   c. If PID is alive but heartbeat is stale: worker is stuck. Log warning.\n1462\t3. For crashed workers:\n1463\t   a. Release any claimed bead\n1464\t   b. Remove heartbeat file\n1465\t   c. Deregister from worker state registry\n1466\t   d. Emit `peer.crashed` telemetry\n1467\t\n1468\t## Worker State Registry\n1469\t\n1470\tA shared file tracks all active workers for fleet-level awareness.\n1471\t\n1472\t```\n1473\t~/.needle/state/workers.json\n1474\t```\n1475\t\n1476\tContents:\n1477\t\n1478\t```json\n1479\t{\n1480\t  \"workers\": [\n1481\t    {\n1482\t      \"id\": \"needle-claude-anthropic-sonnet-alpha\",\n1483\t      \"pid\": 12345,\n1484\t      \"workspace\": \"/home/coder/project\",\n1485\t      \"agent\": \"claude\",\n1486\t      \"model\": \"sonnet\",\n1487\t      \"started_at\": \"2026-03-20T14:00:00Z\",\n1488\t      \"beads_processed\": 7\n1489\t    }\n1490\t  ],\n1491\t  \"updated_at\": \"2026-03-20T15:30:00Z\"\n1492\t}\n1493\t```\n1494\t\n1495\t**Access pattern:**\n1496\t- Workers register on startup, deregister on shutdown\n1497\t- Registry is updated via flock-protected read-modify-write\n1498\t- Used by `needle list`, `needle status`, and fleet-level telemetry\n1499\t- Not used for coordination — heartbeats handle that\n1500\t\n1501\t## Concurrency Limits\n1502\t\n1503\t### Provider/Model Limits\n1504\t\n1505\tRate limiting prevents API throttling and controls cost:\n1506\t\n1507\t```yaml\n1508\tlimits:\n1509\t  launch_stagger_seconds: 2          # delay between worker launches\n1510\t  providers:\n1511\t    anthropic:\n1512\t      max_concurrent: 10             # max workers using Anthropic simultaneously\n1513\t      requests_per_minute: 60\n1514\t    openai:\n1515\t      max_concurrent: 5\n1516\t      requests_per_minute: 40\n1517\t  models:\n1518\t    claude-sonnet:\n1519\t      max_concurrent: 8\n1520\t    claude-opus:\n1521\t      max_concurrent: 3              # expensive model, limit concurrency\n1522\t```\n1523\t\n1524\t**Enforcement:**\n1525\t- Before dispatching to an agent, the worker checks the provider/model concurrency counters\n1526\t- If at limit, the worker waits with backoff (not the same as strand exhaustion — there is work, just rate limited)\n1527\t- Counters are maintained in the worker state registry\n1528\t- RPM limits are enforced via a token bucket per provider (stored in `~/.needle/state/rate_limits/`)\n1529\t\n1530\t### Fleet Sizing\n1531\t\n1532\tThe practical worker limit is not an arbitrary number. It is driven by three runtime constraints:\n1533\t\n1534\t1. **Provider inference throughput.** Each worker waiting on an LLM response is idle CPU but an active API slot. If the provider rate-limits or queues requests, adding workers produces no additional throughput. NEEDLE tracks RPM per provider and warns when request latency exceeds a threshold.\n1535\t\n1536\t2. **Available CPU.** Each agent process (Claude Code, OpenCode, etc.) consumes CPU during tool execution, file I/O, and git operations. NEEDLE's own overhead (strand evaluation, heartbeat I/O, lock contention) also scales with worker count. When system load exceeds a configurable threshold, NEEDLE emits a `fleet.cpu_saturated` warning.\n1537\t\n1538\t3. **Available RAM.** Each agent process holds context in memory. Agent processes with large context windows or many tool calls can consume significant RAM. NEEDLE monitors system memory and warns when free memory drops below a threshold.\n1539\t\n1540\t`max_workers` is a configurable ceiling, not a recommendation. The right value depends on the environment:\n1541\t\n1542\t```yaml\n1543\tworker:\n1544\t  max_workers: 0              # 0 = no hard ceiling, rely on runtime monitoring\n1545\t  cpu_load_warn: 0.8          # warn when system load average > 80% of cores\n1546\t  memory_free_warn_mb: 512    # warn when free memory < 512MB\n1547\t```\n1548\t\n1549\tIf `max_workers` is set, it is enforced at launch time. `needle run --count=25` with `max_workers: 20` will launch 20 and log a warning. If set to 0, NEEDLE launches the requested count and relies on runtime monitoring to signal saturation.\n1550\t\n1551\t## Race Condition Prevention\n1552\t\n1553\tLessons from `docs/notes/claim-race-conditions.md`, applied to the new design:\n1554\t\n1555\t| Race Condition | v1 Impact | v2 Prevention |\n1556\t|---------------|-----------|---------------|\n1557\t| **Thundering herd** | All workers claim same bead | Per-workspace flock serializes claims |\n1558\t| **TOCTOU on closed beads** | Worker claims bead that was just closed | Verify bead status inside flock before claiming |\n1559\t| **Stale claims from crashed workers** | Beads stuck `in_progress` forever | Heartbeat TTL + Mend strand auto-release |\n1560\t| **Lock file leaks** | Orphaned locks block claims | Lock TTL + Mend strand cleanup |\n1561\t| **Concurrent bead creation** | (Weave/Pulse/Unravel) create duplicates | Seen-issue deduplication + creation cooldowns |\n1562\t\n1563\t## Concurrency Invariants\n1564\t\n1565\t1. **One claim at a time per workspace.** The flock guarantees this. Two workers cannot execute `br update --claim` simultaneously in the same workspace.\n1566\t\n1567\t2. **One bead per worker.** A worker holds at most one claimed bead. It releases or verifies closure before claiming another.\n1568\t\n1569\t3. **Claims have a TTL.** If a worker holds a claim for longer than `heartbeat_ttl` without updating its heartbeat, the claim is considered stale and eligible for release by Mend.\n1570\t\n1571\t4. **No implicit locking.** Labels are not locks. Bead status is not a lock. Only flock and `br update --claim` provide mutual exclusion.\n1572\t\n1573\t5. **Lock scope is minimal.** The workspace flock is held for milliseconds (duration of the `br` CLI call), never for the duration of bead execution.\n1574\t\n1575\t---\n1576\t\n1577\t# Telemetry\n1578\t\n1579\tEvery state transition, claim attempt, dispatch, and outcome emits structured telemetry. A silent worker is a broken worker.\n1580\t\n1581\t## Telemetry Design Principles\n1582\t\n1583\t1. **Structured from origin.** Events are typed structs, not log strings. They are serialized to JSONL for storage and consumption. There is no string parsing.\n1584\t\n1585\t2. **Separate from agent output.** Telemetry is written to NEEDLE's own sinks. It is never interleaved with agent stdout/stderr. This eliminates the stdout corruption bug class from v1 (see `docs/notes/bash-at-scale-problems.md`).\n1586\t\n1587\t3. **Non-blocking.** Telemetry emission never blocks the worker loop. If a sink is slow or failing, events are buffered and dropped after a threshold, not retried.\n1588\t\n1589\t4. **Complete.** Every state transition produces an event. If you reconstruct events for a worker, you can replay its entire session.\n1590\t\n1591\t## Event Schema\n1592\t\n1593\tAll events share a common envelope:\n1594\t\n1595\t```json\n1596\t{\n1597\t  \"timestamp\": \"2026-03-20T15:30:00.123Z\",\n1598\t  \"event_type\": \"bead.claim.attempted\",\n1599\t  \"worker_id\": \"needle-claude-anthropic-sonnet-alpha\",\n1600\t  \"session_id\": \"a1b2c3d4\",\n1601\t  \"sequence\": 42,\n1602\t  \"bead_id\": \"nd-a3f8\",\n1603\t  \"workspace\": \"/home/coder/project\",\n1604\t  \"data\": { }\n1605\t}\n1606\t```\n1607\t\n1608\t| Field | Type | Description |\n1609\t|-------|------|-------------|\n1610\t| `timestamp` | ISO 8601 with milliseconds | When the event occurred |\n1611\t| `event_type` | Dotted string | Event classification |\n1612\t| `worker_id` | String | Unique worker identifier |\n1613\t| `session_id` | String | Unique session identifier (random per boot) |\n1614\t| `sequence` | u64 | Monotonically increasing per session (enables ordering) |\n1615\t| `bead_id` | String? | Bead ID if applicable |\n1616\t| `workspace` | Path? | Workspace path if applicable |\n1617\t| `data` | Object | Event-specific payload |\n1618\t\n1619\t## Event Catalog\n1620\t\n1621\t### Worker Lifecycle\n1622\t\n1623\t| Event Type | Emitted When | Data Fields |\n1624\t|------------|-------------|-------------|\n1625\t| `worker.started` | Worker boots successfully | `agent`, `model`, `config_hash`, `version` |\n1626\t| `worker.stopped` | Graceful shutdown | `beads_processed`, `uptime_seconds`, `reason` |\n1627\t| `worker.errored` | Unrecoverable error | `error_type`, `error_message`, `beads_processed` |\n1628\t| `worker.exhausted` | All strands empty | `cycle_count`, `last_strand_evaluated` |\n1629\t| `worker.idle` | Entering backoff after exhaustion | `backoff_seconds` |\n1630\t\n1631\t### Strand Evaluation\n1632\t\n1633\t| Event Type | Emitted When | Data Fields |\n1634\t|------------|-------------|-------------|\n1635\t| `strand.evaluated` | Strand returns a result | `strand_name`, `result` (`bead_found`, `work_created`, `no_work`, `error`), `duration_ms` |\n1636\t| `strand.skipped` | Strand is disabled | `strand_name`, `reason` |\n1637\t\n1638\t### Bead Operations\n1639\t\n1640\t| Event Type | Emitted When | Data Fields |\n1641\t|------------|-------------|-------------|\n1642\t| `bead.claim.attempted` | Claim attempt starts | `bead_id`, `retry_number` |\n1643\t| `bead.claim.succeeded` | Claim won | `bead_id`, `priority`, `title_hash` |\n1644\t| `bead.claim.race_lost` | Claim lost to another worker | `bead_id`, `claimed_by` |\n1645\t| `bead.claim.failed` | Claim failed (not race) | `bead_id`, `reason` |\n1646\t| `bead.released` | Bead released back to queue | `bead_id`, `reason` (`failure`, `timeout`, `crash`, `interrupted`) |\n1647\t| `bead.completed` | Bead closed by agent (detected) | `bead_id`, `duration_ms` |\n1648\t| `bead.orphaned` | Agent exited 0 but bead still open | `bead_id` |\n1649\t\n1650\t### Agent Dispatch\n1651\t\n1652\t| Event Type | Emitted When | Data Fields |\n1653\t|------------|-------------|-------------|\n1654\t| `agent.dispatched` | Agent process started | `agent_name`, `model`, `pid`, `prompt_hash`, `prompt_tokens_est` |\n1655\t| `agent.executing` | Periodic during execution | `pid`, `elapsed_ms`, `still_alive` |\n1656\t| `agent.completed` | Agent process exited | `exit_code`, `elapsed_ms`, `stdout_bytes`, `stderr_bytes` |\n1657\t| `agent.timeout` | Agent killed for timeout | `timeout_ms`, `pid` |\n1658\t\n1659\t### Outcome Handling\n1660\t\n1661\t| Event Type | Emitted When | Data Fields |\n1662\t|------------|-------------|-------------|\n1663\t| `outcome.classified` | Exit code mapped to outcome | `outcome` (`success`, `failure`, `timeout`, `crash`, `agent_not_found`, `interrupted`), `exit_code` |\n1664\t| `outcome.handled` | Handler executed | `outcome`, `action` (`released`, `deferred`, `alerted`, `none`) |\n1665\t\n1666\t### Health\n1667\t\n1668\t| Event Type | Emitted When | Data Fields |\n1669\t|------------|-------------|-------------|\n1670\t| `heartbeat.emitted` | Heartbeat file updated | `state`, `current_bead` |\n1671\t| `peer.stale` | Stale peer detected | `peer_id`, `last_seen`, `claimed_bead` |\n1672\t| `peer.crashed` | Dead peer cleaned up | `peer_id`, `released_bead` |\n1673\t| `health.check` | Periodic health check | `db_healthy`, `disk_free_mb`, `peer_count` |\n1674\t| `fleet.cpu_saturated` | System load exceeds threshold | `load_average` (f64), `threshold` (f64), `core_count` (usize) |\n1675\t| `fleet.memory_low` | Free memory below threshold | `free_mb` (u64), `threshold_mb` (u64) |\n1676\t\n1677\t### Effort Tracking\n1678\t\n1679\t| Event Type | Emitted When | Data Fields |\n1680\t|------------|-------------|-------------|\n1681\t| `effort.recorded` | After each bead processing cycle | `bead_id`, `elapsed_ms`, `agent_name`, `model`, `tokens_in`, `tokens_out`, `estimated_cost_usd` |\n1682\t\n1683\t## Sinks\n1684\t\n1685\tTelemetry events are dispatched to one or more sinks. Sinks are configured independently.\n1686\t\n1687\t### File Sink (default, always on)\n1688\t\n1689\tWrites JSONL to per-worker log files:\n1690\t\n1691\t```\n1692\t~/.needle/logs/<worker-id>.jsonl\n1693\t```\n1694\t\n1695\t- One line per event\n1696\t- File is append-only\n1697\t- Rotation: new file per session (session ID in filename) or size-based (configurable)\n1698\t\n1699\t### Stdout Sink (optional)\n1700\t\n1701\tWrites human-readable summary to stdout for interactive monitoring:\n1702\t\n1703\t```\n1704\t15:30:00 [alpha] CLAIMED nd-a3f8 (p1: \"Fix auth middleware\")\n1705\t15:30:02 [alpha] DISPATCHED claude-sonnet pid=12345\n1706\t15:32:15 [alpha] SUCCESS nd-a3f8 (135s, ~2400 tokens)\n1707\t15:32:15 [alpha] CLAIMED nd-b2c9 (p2: \"Add rate limiting tests\")\n1708\t```\n1709\t\n1710\t- Enabled when worker runs in foreground or via `needle attach`\n1711\t- Format is configurable: `minimal`, `normal`, `verbose`\n1712\t- Color-coded by event type\n1713\t\n1714\t### Hook Sink (optional)\n1715\t\n1716\tDispatches events to external systems via webhook or command:\n1717\t\n1718\t```yaml\n1719\ttelemetry:\n1720\t  hooks:\n1721\t    - event_filter: \"outcome.*\"\n1722\t      command: \"curl -X POST https://webhook.example.com/needle -d @-\"\n1723\t    - event_filter: \"worker.errored\"\n1724\t      command: \"/path/to/alert-script.sh\"\n1725\t    - event_filter: \"effort.recorded\"\n1726\t      command: \"/path/to/cost-tracker.sh\"\n1727\t```\n1728\t\n1729\t- Events matching the filter are piped as JSON to the command's stdin\n1730\t- Hook execution is fire-and-forget (non-blocking)\n1731\t- Failed hooks emit a `telemetry.hook.failed` event to the file sink (not recursively to hooks)\n1732\t\n1733\t### OTLP Sink (optional)\n1734\t\n1735\tExports telemetry as OpenTelemetry signals (traces, metrics, logs) over OTLP to any compliant collector (OpenTelemetry Collector, Jaeger, Tempo, Grafana Alloy, Honeycomb, Datadog, etc.). This is the canonical integration point for FABRIC and any downstream observability plane.\n1736\t\n1737\t```yaml\n1738\ttelemetry:\n1739\t  otlp:\n1740\t    enabled: true\n1741\t    endpoint: \"http://otel-collector.tailnet:4317\"    # gRPC default; use 4318 for HTTP\n1742\t    protocol: grpc                                     # grpc | http/protobuf\n1743\t    headers:\n1744\t      authorization: \"Bearer ${OTEL_TOKEN}\"            # env interpolation\n1745\t    timeout_ms: 5000\n1746\t    compression: gzip                                  # none | gzip\n1747\t    tls:\n1748\t      insecure: false\n1749\t      ca_file: \"\"\n1750\t    signals:\n1751\t      traces: true\n1752\t      metrics: true\n1753\t      logs: true\n1754\t    resource_attributes:\n1755\t      deployment.environment: \"production\"\n1756\t      service.namespace: \"needle-fleet\"\n1757\t```\n1758\t\n1759\tDesign:\n1760\t\n1761\t- **Non-blocking.** Uses a batch span/log/metric processor. If the collector is unreachable, events are buffered up to a bounded queue, then dropped (same policy as file sink). Drops emit a `telemetry.otlp.dropped` event to the file sink (never recursively to OTLP).\n1762\t- **Additive.** The file sink is authoritative. OTLP is an export, not a replacement. If OTLP is disabled or misconfigured, NEEDLE behaves identically to a file-sink-only deployment.\n1763\t- **Stdlib deps.** Rust crates: `opentelemetry`, `opentelemetry_sdk`, `opentelemetry-otlp`, `opentelemetry-semantic-conventions`. All support OTLP/gRPC and OTLP/HTTP.\n1764\t- **W3C trace context.** Trace and span IDs are generated per the W3C Trace Context spec so they interop with any OTel backend.\n1765\t- **Graceful shutdown.** On `worker.stopped`, the exporter is flushed with a deadline before process exit. Failure to flush is logged but never blocks shutdown.\n1766\t\n1767\t## OpenTelemetry Semantic Mapping\n1768\t\n1769\tNEEDLE's existing event catalog maps cleanly to OpenTelemetry's three signal types. This mapping is **normative** — the OTLP sink implementation must conform to it so dashboards and alerts remain stable across NEEDLE versions.\n1770\t\n1771\t### Resource Attributes\n1772\t\n1773\tEvery exported signal carries these resource attributes (per OTel semantic conventions):\n1774\t\n1775\t| Attribute | Value | Source |\n1776\t|-----------|-------|--------|\n1777\t| `service.name` | `\"needle\"` | Constant |\n1778\t| `service.version` | build version | `env!(\"CARGO_PKG_VERSION\")` |\n1779\t| `service.instance.id` | `<worker_id>` | e.g., `needle-claude-anthropic-sonnet-alpha` |\n1780\t| `service.namespace` | `\"needle-fleet\"` (default, configurable) | Config |\n1781\t| `deployment.environment` | e.g., `\"production\"` | Config |\n1782\t| `host.name` | hostname | OS |\n1783\t| `process.pid` | worker PID | OS |\n1784\t| `needle.agent` | e.g., `\"claude-anthropic-sonnet\"` | Worker config |\n1785\t| `needle.model` | e.g., `\"claude-sonnet-4-6\"` | Worker config |\n1786\t| `needle.session_id` | session ID | Per-boot random |\n1787\t| `needle.workspace` | workspace path | Worker config |\n1788\t\n1789\t### Traces\n1790\t\n1791\tThe NEEDLE state machine is naturally hierarchical, which maps directly to OTel spans.\n1792\t\n1793\t```\n1794\tworker.session                                          (root span, lifetime = worker process)\n1795\t├── strand.pluck                                        (one per strand evaluation)\n1796\t│   └── bead.lifecycle                                  (one per claimed bead)\n1797\t│       ├── bead.claim                                  (ATOMIC phase)\n1798\t│       ├── bead.prompt_build\n1799\t│       ├── agent.dispatch                              (DISPATCHING + EXECUTING)\n1800\t│       │   └── agent.execution                         (process alive; span.ok on exit 0)\n1801\t│       └── bead.outcome                                (HANDLING)\n1802\t│           └── bead.mitosis?                           (optional, if outcome = failure)\n1803\t├── strand.mend\n1804\t├── strand.explore\n1805\t├── strand.weave\n1806\t├── strand.unravel\n1807\t├── strand.pulse\n1808\t└── strand.knot                                         (terminal backoff / exhaustion)\n1809\t```\n1810\t\n1811\tSpan naming follows OpenTelemetry conventions: lowercase dotted, verb-form where appropriate.\n1812\t\n1813\t**Span attributes** follow OTel semantic conventions where applicable, plus a `needle.*` namespace:\n1814\t\n1815\t| Span | Key Attributes |\n1816\t|------|----------------|\n1817\t| `worker.session` | `needle.beads_processed`, `needle.uptime_seconds`, `needle.exit_reason` |\n1818\t| `strand.*` | `needle.strand.name`, `needle.strand.result`, `needle.strand.duration_ms` |\n1819\t| `bead.lifecycle` | `needle.bead.id`, `needle.bead.priority`, `needle.bead.title_hash`, `needle.bead.outcome` |\n1820\t| `bead.claim` | `needle.claim.retry_number`, `needle.claim.result` (`succeeded` / `race_lost` / `failed`) |\n1821\t| `agent.dispatch` | `gen_ai.system` (e.g., `anthropic`), `gen_ai.request.model`, `gen_ai.usage.input_tokens`, `gen_ai.usage.output_tokens`, `needle.agent.pid`, `needle.agent.exit_code` |\n1822\t| `bead.outcome` | `needle.outcome` (`success` / `failure` / `timeout` / `crash` / `agent_not_found` / `interrupted`), `needle.outcome.action` |\n1823\t\n1824\t**GenAI semantic conventions.** The `agent.dispatch` span uses OTel's `gen_ai.*` conventions so NEEDLE's token/cost data shows up in GenAI dashboards out-of-the-box (Grafana GenAI app, Langfuse, Honeycomb AI, etc.).\n1825\t\n1826\t**Span status.** Success outcomes set `Status::Ok`. All other outcomes set `Status::Error` with a description matching the `needle.outcome` value. This makes error-rate SLOs trivial.\n1827\t\n1828\t**Context propagation.** The trace ID from `worker.session` is recorded in the file-sink event envelope as a new optional field `trace_id`, enabling correlation between the JSONL file sink and the OTel backend without ambiguity.\n1829\t\n1830\t### Metrics\n1831\t\n1832\tMetrics are emitted via the OTel Meter API, one `Meter` per worker. All metrics are prefixed `needle.*`.\n1833\t\n1834\t| Metric | Instrument | Unit | Attributes | Description |\n1835\t|--------|-----------|------|------------|-------------|\n1836\t| `needle.workers.active` | UpDownCounter | `{worker}` | — | Current live worker count (incremented on `worker.started`, decremented on `worker.stopped`) |\n1837\t| `needle.beads.claimed` | Counter | `{bead}` | `strand`, `priority` | Successful bead claims |\n1838\t| `needle.beads.completed` | Counter | `{bead}` | `outcome` | Bead terminal outcomes (one per `bead.outcome`) |\n1839\t| `needle.beads.duration` | Histogram | `ms` | `outcome` | End-to-end bead lifecycle time |\n1840\t| `needle.claim.attempts` | Counter | `{attempt}` | `result` (`succeeded`/`race_lost`/`failed`) | Claim attempts |\n1841\t| `needle.strand.duration` | Histogram | `ms` | `strand`, `result` | Strand evaluation time |\n1842\t| `needle.agent.duration` | Histogram | `ms` | `agent`, `model`, `exit_code` | Agent process runtime |\n1843\t| `needle.agent.tokens.input` | Counter | `{token}` | `agent`, `model` | Input tokens consumed |\n1844\t| `needle.agent.tokens.output` | Counter | `{token}` | `agent`, `model` | Output tokens produced |\n1845\t| `needle.cost.usd` | Counter | `USD` | `agent`, `model` | Estimated cost accumulator |\n1846\t| `needle.heartbeat.age` | Gauge (observable) | `s` | `worker_id` | Seconds since last heartbeat emitted by this worker |\n1847\t| `needle.peers.stale` | UpDownCounter | `{peer}` | — | Currently-stale peers observed by this worker |\n1848\t| `needle.queue.depth` | Gauge (observable) | `{bead}` | `workspace`, `priority` | Open beads visible to this worker (sampled at strand evaluation) |\n1849\t| `needle.mitosis.children_created` | Counter | `{bead}` | `parent_id` | Mitosis child creations |\n1850\t| `needle.outcome.rate` | derived | — | — | Computed in the backend as `needle.beads.completed{outcome=\"success\"} / needle.beads.completed` |\n1851\t\n1852\tMetric aggregation temporality is **delta** (standard OTel default); backends that require cumulative (Prometheus via prometheusreceiver) convert upstream.\n1853\t\n1854\t### Logs\n1855\t\n1856\tEvery NEEDLE telemetry event that isn't already represented as a span event is exported as an OTel LogRecord with:\n1857\t\n1858\t- `severity_number` / `severity_text`: `INFO` for normal events, `WARN` for `peer.stale` / `telemetry.*.dropped`, `ERROR` for `worker.errored` / `bead.claim.failed` / `agent.timeout`.\n1859\t- `body`: the existing event `data` object.\n1860\t- `attributes`: flattened from the event envelope (`event_type`, `bead_id`, `workspace`, etc.).\n1861\t- `trace_id` / `span_id`: linked to the enclosing `bead.lifecycle` or `worker.session` span where applicable.\n1862\t\n1863\tEvents that ARE spans (e.g., `bead.claim.attempted` → a span, not a log) do not double-export as logs.\n1864\t\n1865\t### Span Events vs. Logs\n1866\t\n1867\tIntra-span state changes (e.g., `agent.executing` heartbeats, `heartbeat.emitted`) are recorded as OTel **span events** on the nearest enclosing span, not as separate logs. This keeps the signal count manageable and makes timelines in Tempo/Jaeger readable.\n1868\t\n1869\t## Token and Cost Tracking\n1870\t\n1871\t### Token Extraction\n1872\t\n1873\tNEEDLE attempts to extract token usage from agent output. This is agent-specific and best-effort:\n1874\t\n1875\t| Agent | Extraction Method |\n1876\t|-------|-------------------|\n1877\t| Claude Code | Parse `--output-format json` for `usage.input_tokens`, `usage.output_tokens` |\n1878\t| OpenCode | Parse structured output (TBD) |\n1879\t| Codex CLI | Parse structured output (TBD) |\n1880\t| Aider | Parse cost summary line from stderr |\n1881\t| Generic | No extraction; record elapsed time only |\n1882\t\n1883\tIf token extraction fails, the event is still emitted with `null` token fields. Missing tokens are not an error.\n1884\t\n1885\t### Cost Estimation\n1886\t\n1887\tCost is estimated from tokens using configurable per-model pricing:\n1888\t\n1889\t```yaml\n1890\tpricing:\n1891\t  claude-sonnet:\n1892\t    input_per_million: 3.00\n1893\t    output_per_million: 15.00\n1894\t  claude-opus:\n1895\t    input_per_million: 15.00\n1896\t    output_per_million: 75.00\n1897\t  gpt-4:\n1898\t    input_per_million: 30.00\n1899\t    output_per_million: 60.00\n1900\t```\n1901\t\n1902\tCost is **estimated**, never authoritative. It is recorded in telemetry for trend analysis, not for billing.\n1903\t\n1904\t## Querying Telemetry\n1905\t\n1906\tNEEDLE includes built-in telemetry queries via the CLI:\n1907\t\n1908\t```bash\n1909\t# Summary of today's work\n1910\tneedle status\n1911\t\n1912\t# Per-worker breakdown\n1913\tneedle status --by-worker\n1914\t\n1915\t# Cost summary\n1916\tneedle status --cost --since 2026-03-20\n1917\t\n1918\t# Event stream (tail -f equivalent)\n1919\tneedle logs --follow\n1920\t\n1921\t# Filter by event type\n1922\tneedle logs --filter \"bead.claim.*\" --since 1h\n1923\t\n1924\t# Export for external analysis\n1925\tneedle logs --format jsonl --since 24h > export.jsonl\n1926\t```\n1927\t\n1928\t---\n1929\t\n1930\t# Self-Healing\n1931\t\n1932\tNEEDLE workers must detect and recover from failures without human intervention. This section specifies the failure modes, detection mechanisms, and recovery procedures.\n1933\t\n1934\t## Failure Taxonomy\n1935\t\n1936\t| Failure | Scope | Detection | Recovery |\n1937\t|---------|-------|-----------|----------|\n1938\t| Worker crash | Worker | Heartbeat TTL expiry | Peer cleanup via Mend |\n1939\t| Worker stuck | Worker | Heartbeat stale + PID alive | Alert via Knot |\n1940\t| Agent hang | Bead | Execution timeout | Kill process, release bead |\n1941\t| Stale claim | Bead | in_progress + no heartbeat | Mend releases bead |\n1942\t| Orphaned lock | Workspace | Lock file age > TTL | Mend removes lock |\n1943\t| Database corruption | Workspace | `br doctor` detects | Auto-repair from JSONL |\n1944\t| Stale dependency | Bead | Closed bead still blocks open bead | Mend cleans dependency |\n1945\t| Disk full | System | Write failure | Emit alert, graceful stop |\n1946\t| Bead store unreachable | System | `br` command fails | Retry with backoff, then stop |\n1947\t\n1948\t## Heartbeat-Based Detection\n1949\t\n1950\t```\n1951\tWorker A (alive)          Worker B (alive)         Worker C (crashed)\n1952\t┌──────────────┐         ┌──────────────┐         ┌──────────────┐\n1953\t│ heartbeat:   │         │ heartbeat:   │         │ heartbeat:   │\n1954\t│ 15:30:00     │         │ 15:30:10     │         │ 15:20:00     │ ← stale\n1955\t│ state: EXEC  │         │ state: SEL   │         │ state: EXEC  │\n1956\t│ bead: nd-a3f │         │ bead: null   │         │ bead: nd-x7y │ ← orphaned claim\n1957\t└──────────────┘         └──────────────┘         └──────────────┘\n1958\t\n1959\tWorker B runs Mend strand:\n1960\t  1. Reads all heartbeat files\n1961\t  2. Detects C's heartbeat is stale (10 min old, TTL is 5 min)\n1962\t  3. Checks PID: dead\n1963\t  4. Releases nd-x7y: br update nd-x7y --status open --unassign\n1964\t  5. Removes C's heartbeat file\n1965\t  6. Deregisters C from worker registry\n1966\t  7. Emits peer.crashed telemetry\n1967\t```\n1968\t\n1969\t### Detection Parameters\n1970\t\n1971\t| Parameter | Default | Description |\n1972\t|-----------|---------|-------------|\n1973\t| `heartbeat_interval` | 30s | How often a worker writes its heartbeat |\n1974\t| `heartbeat_ttl` | 5min | How long before a heartbeat is considered stale |\n1975\t| `peer_check_interval` | 60s | How often Mend checks peer heartbeats |\n1976\t\n1977\t**Relationship:** `heartbeat_ttl` should be at least `3 × heartbeat_interval` to tolerate transient delays.\n1978\t\n1979\t### Stuck vs. Crashed\n1980\t\n1981\t| Signal | Diagnosis | Action |\n1982\t|--------|-----------|--------|\n1983\t| Stale heartbeat + PID dead | **Crashed.** Worker terminated unexpectedly. | Release claim, clean up, emit `peer.crashed` |\n1984\t| Stale heartbeat + PID alive | **Stuck.** Worker is hung (deadlock, infinite loop, blocked I/O). | Emit `peer.stale` warning. Do NOT kill — may be legitimately slow. Alert via Knot after threshold. |\n1985\t| Fresh heartbeat + PID alive | **Healthy.** Normal operation. | No action. |\n1986\t\n1987\t**NEEDLE does not auto-kill stuck workers.** A stuck worker with a live PID may be executing a legitimately slow agent. Killing it would interrupt work. Instead, NEEDLE alerts via Knot and lets the human decide.\n1988\t\n1989\t## Database Recovery\n1990\t\n1991\tbeads_rust uses SQLite with a known corruption issue (FrankenSQLite, upstream #171). NEEDLE must handle this.\n1992\t\n1993\t### Recovery Procedure\n1994\t\n1995\t```\n1996\tCorruption detected\n1997\t       │\n1998\t       ▼\n1999\t  Run br doctor --repair\n2000\t       │\n2001\t       ├── Success ──► Resume operation, emit health.db_repaired\n2002\t       │\n2003\t       └── Failure ──► Full rebuild:\n2004\t                          1. rm .beads/beads.db\n2005\t                          2. br sync --import\n2006\t                          3. Verify: br doctor\n2007\t                          │\n2008\t                          ├── Success ──► Resume, emit health.db_rebuilt\n2009\t                          │\n2010\t                          └── Failure ──► ERRORED state (JSONL itself may be corrupt)\n2011\t```\n2012\t\n2013\t**Key insight from `docs/notes/mitosis-explosion-postmortem.md`:** The JSONL file is always the authoritative data source. It is append-only and immune to SQLite corruption. Recovery always rebuilds from JSONL.\n2014\t\n2015\t### Proactive Health Checks\n2016\t\n2017\tThe Mend strand runs `br doctor` (without `--repair`) periodically:\n2018\t- After every N beads processed (configurable, default: 50)\n2019\t- On every Mend strand evaluation\n2020\t- If doctor reports warnings, escalate to `--repair` immediately rather than waiting for failure\n2021\t\n2022\t## Stale Claim Recovery\n2023\t\n2024\t```\n2025\tMend strand evaluates:\n2026\t  1. Query beads with status=in_progress\n2027\t  2. For each:\n2028\t     a. Read assigned worker ID from bead\n2029\t     b. Check worker's heartbeat file\n2030\t     c. If heartbeat is stale AND PID is dead:\n2031\t        - br update <bead_id> --status open --unassign\n2032\t        - Emit bead.released telemetry (reason: stale_claim)\n2033\t     d. If heartbeat is stale AND PID is alive:"}]},"parent_tool_use_id":null,"session_id":"72539a33-4a3d-4268-95e8-c3da33ecc3f7","uuid":"5fe30c76-13f0-4051-8aa0-c5cf66a09508","timestamp":"2026-05-30T15:27:54.980Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/NEEDLE/docs/plan/plan.md","content":"# NEEDLE Implementation Plan\n\n> **N**avigates **E**very **E**nqueued **D**eliverable, **L**ogs **E**ffort\n\n## Design Principles\n\nThese six principles are non-negotiable. Every design decision in this plan traces back to one or more of them.\n\n1. **Deterministic order.** Given the same queue state, every worker computes the same bead ordering. There is no randomness in selection. Ties are broken by creation time.\n\n2. **Explicit outcome paths.** Every possible result of every operation has a named handler. If an outcome can happen, it has a handler. If it doesn't have a handler, it cannot happen. The type system enforces exhaustiveness.\n\n3. **Platform and model agnostic.** NEEDLE wraps any headless CLI that accepts a prompt and exits. It runs on any POSIX system. It does not depend on any specific AI provider, model, or API.\n\n4. **Observable by default.** Every state transition, claim attempt, dispatch, and outcome emits structured telemetry. A silent worker is a broken worker. Telemetry is structured from origin (JSONL) and exportable as OpenTelemetry (OTLP) so any compliant backend — Tempo, Jaeger, Grafana, Honeycomb, Datadog, FABRIC — can consume NEEDLE's signals without a custom adapter.\n\n5. **Self-healing.** Workers detect and recover from stuck states, stale claims, crashed peers, and corrupted databases without human intervention. Recovery paths are explicit, not heuristic.\n\n6. **Separation of concerns.** The orchestrator does not execute work. The agent does not manage state. The bead store does not enforce workflow. Each component has one job.\n\n---\n\n## Architecture Overview\n\nNEEDLE is composed of five layers:\n\n```\n┌──────────────────────────────────────────────────────────────┐\n│                        CLI Layer                              │\n│  needle run | stop | list | attach | status | config          │\n├──────────────────────────────────────────────────────────────┤\n│                     Worker Layer                              │\n│  Worker loop, strand waterfall, session management            │\n├──────────────────────────────────────────────────────────────┤\n│                  Coordination Layer                            │\n│  Claiming, locking, heartbeats, peer awareness                │\n├──────────────────────────────────────────────────────────────┤\n│                    Agent Layer                                 │\n│  Adapter interface, dispatch, result capture                  │\n├──────────────────────────────────────────────────────────────┤\n│                   Foundation Layer                             │\n│  Telemetry, configuration, bead store interface, self-healing │\n└──────────────────────────────────────────────────────────────┘\n```\n\n### Component Map\n\n| Component | Responsibility | Inputs | Outputs |\n|-----------|---------------|--------|---------|\n| **CLI** | Parse commands, manage sessions | User commands | Worker processes |\n| **Worker** | Execute the strand waterfall loop | Bead queue state | Dispatch requests, state transitions |\n| **StrandRunner** | Evaluate strands in sequence | Queue state, config | Next bead or escalation |\n| **Claimer** | Atomic bead claiming with serialization | Candidate bead ID | Claimed bead or race-lost signal |\n| **PromptBuilder** | Construct deterministic prompts from bead context | Claimed bead | Prompt string |\n| **Dispatcher** | Load adapter, render template, execute agent | Prompt, adapter config | Agent process handle |\n| **OutcomeHandler** | Route exit code to explicit handler | Exit code, stdout/stderr | State transition |\n| **Telemetry** | Structured event emission | Any component event | JSONL records |\n| **HealthMonitor** | Heartbeat, stuck detection, peer awareness | Worker state | Recovery actions |\n| **ConfigLoader** | Hierarchical config resolution | Files, env, CLI args | Resolved config |\n| **BeadStore** | Abstract interface to bead backend | CRUD operations | Bead records |\n| **Mitosis** | Split multi-task beads into children with dedup | Failed bead, parent's existing children | Child beads or no-op |\n\n---\n\n## Language Decision\n\nThe implementation language must provide:\n\n| Requirement | Why | Source |\n|-------------|-----|--------|\n| Exhaustive pattern matching | Every outcome must be handled; compiler enforces it | Principle 2, bead-lifecycle-bugs.md |\n| Real module system | 45K single-file bash was unmaintainable | bash-at-scale-problems.md |\n| Structured error types | Silent failures caused cascading bugs | claim-race-conditions.md |\n| Native JSON support | Fragile jq parsing corrupted state | worker-starvation-lessons.md |\n| Proper concurrency primitives | flock/trap/PID files were inadequate | concurrency-approaches-compared.md |\n| Single binary distribution | NEEDLE must be trivially installable | Principle 3 |\n| Cross-platform | Linux, macOS at minimum | Principle 3 |\n| Static analysis | Catch undefined functions, unused variables at compile time | bundler-build-integrity.md |\n\n**Recommended: Rust.** Exhaustive `match`, `Result<T, E>` error handling, `serde_json`, `tokio` for async, single binary via static linking, cross-compilation. The beads ecosystem already has Rust precedent (beads_rust, beads-polis).\n\n**Acceptable alternative: Go.** Simpler learning curve, good concurrency, single binary. Lacks exhaustive matching (requires discipline instead of compiler enforcement).\n\n**Not acceptable: Bash, Python, Node.** Bash failed at scale (documented). Python/Node require runtime dependencies, violating single-binary distribution.\n\n---\n\n## Key Decisions from Research\n\nThese decisions are informed by the 14 research files in `docs/research/`:\n\n| Decision | Chosen Approach | Alternative Considered | Why |\n|----------|----------------|----------------------|-----|\n| Bead store interface | Abstract trait over `br` CLI | Direct SQLite access | Platform agnostic; works with future bead backends |\n| Claim atomicity | `br update --claim` + workspace flock | Central coordinator (Perles) | No SPOF; works with decentralized workers |\n| Heartbeat model | File-based heartbeat with TTL (from beads-polis) | Shared memory | Survives worker crashes; observable by peers |\n| Validation gates | Pluggable gate system (inspired by bg-gate) | Hardcoded checks | Different workspaces need different validation |\n| Work decomposition | Built-in mitosis with child-aware dedup | External only (spec2beads) | Mitosis is valid when the split criteria are semantic (multi-task detection) and dedup checks the parent's existing children |\n| Self-modification | Allowed with release channel promotion (testing → stable → fleet hot-reload) | Prohibited entirely | v1 failures came from untested changes deploying directly to the fleet. Canary testing with defined inputs/outputs prevents this. |\n| Workspace discovery | Explicit configuration | Filesystem scanning | Explore strand's unbounded find caused 35+ load |\n| Alert system | Verify-then-alert with rate limiting | Alert-on-empty | 100% false positive rate from naive alerting |\n\n## Key Decisions from Operational Learnings\n\nThese decisions are informed by the 9 notes files in `docs/notes/`:\n\n| Learning | Design Response |\n|----------|----------------|\n| Mitosis explosion (5,741 duplicate beads) | Mitosis checks parent's existing children before creating new ones. Duplicate splits are structurally impossible. Split criteria are semantic (multi-task detection), not numeric. |\n| 100% false positive starvation alerts | Three-state model: no beads exist / all claimed / invisible. Verify independently before alerting. |\n| Bundler shipped undefined functions | Compiled language eliminates this class entirely. |\n| Agent-owned closure most reliable | NEEDLE does not close beads. Agent receives `br close <id>` instruction in prompt. |\n| stdout/stderr corruption | Telemetry is a structured system, never interleaved with agent output. |\n| Workers modifying their own orchestrator | Self-modification allowed via release channels. New builds must pass canary tests in isolation before promotion to `:stable`. Fleet hot-reloads from `:stable`, never from `:testing`. |\n| ~20 worker practical limit (EX44) | Fleet sizing is bounded by three runtime factors: provider inference throughput, available CPU, and available RAM. NEEDLE monitors these and warns when saturated. Staggered launch is default. |\n| Bead granularity affects success rate | Document guidelines but don't enforce — this is a bead authoring concern, not orchestration. |\n\n---\n\n# State Machine\n\nThe worker loop is a finite state machine. Every state has defined entry conditions, actions, and exit transitions. There are no implicit states or fallthrough paths.\n\n## Worker States\n\n```\n                    ┌──────────┐\n                    │  BOOTING │\n                    └────┬─────┘\n                         │ config loaded, health check passed\n                         ▼\n                    ┌──────────┐\n              ┌────►│ SELECTING│◄──────────────────────────────┐\n              │     └────┬─────┘                                │\n              │          │ candidate found                      │\n              │          ▼                                      │\n              │     ┌──────────┐  race lost (retry < max)      │\n              │     │ CLAIMING │──────────────────────────┐    │\n              │     └────┬─────┘                           │    │\n              │          │ claimed                         │    │\n              │          ▼                                 ▼    │\n              │     ┌──────────┐                     ┌────────┐│\n              │     │ BUILDING │                     │RETRYING││\n              │     └────┬─────┘                     └────┬───┘│\n              │          │ prompt ready                   │     │\n              │          ▼                                └─────┘\n              │     ┌────────────┐\n              │     │DISPATCHING │\n              │     └────┬───────┘\n              │          │ agent process started\n              │          ▼\n              │     ┌──────────┐\n              │     │ EXECUTING│\n              │     └────┬─────┘\n              │          │ agent exited\n              │          ▼\n              │     ┌──────────┐\n              │     │ HANDLING │\n              │     └────┬─────┘\n              │          │ outcome processed\n              │          ▼\n              │     ┌──────────┐\n              │     │ LOGGING  │\n              │     └────┬─────┘\n              │          │ telemetry emitted\n              └──────────┘\n```\n\n### Terminal States\n\n```\n    ┌───────────┐       ┌───────────┐       ┌───────────┐\n    │ EXHAUSTED │       │  STOPPED  │       │  ERRORED  │\n    └───────────┘       └───────────┘       └───────────┘\n    all strands empty   graceful shutdown   unrecoverable\n```\n\n## State Definitions\n\n### BOOTING\n\n**Entry:** Worker process started.\n\n**Actions:**\n1. Load configuration (global → workspace → CLI overrides)\n2. Validate bead store connectivity (`br doctor` or equivalent)\n3. Register in worker state registry\n4. Emit `worker.started` telemetry event\n5. Start heartbeat emitter\n\n**Transitions:**\n| Condition | Next State |\n|-----------|-----------|\n| Config loaded, bead store healthy | SELECTING |\n| Config invalid | ERRORED |\n| Bead store unreachable | ERRORED (after retry with backoff) |\n\n### SELECTING\n\n**Entry:** Worker is ready for next bead. This is the strand waterfall entry point.\n\n**Actions:**\n1. Emit heartbeat\n2. Evaluate strands in sequence\n3. First strand that yields a candidate bead wins\n\n**Transitions:**\n| Condition | Next State |\n|-----------|-----------|\n| Candidate bead found | CLAIMING |\n| All strands exhausted | EXHAUSTED |\n| Shutdown signal received | STOPPED |\n\n### CLAIMING\n\n**Entry:** A candidate bead has been selected.\n\n**Actions:**\n1. Acquire workspace claim lock (flock, per-workspace)\n2. Verify bead is still claimable (`br show --json`, check status + assignee)\n3. Attempt atomic claim: `br update <id> --claim --actor <worker-id>`\n4. Release workspace claim lock\n5. Emit `bead.claim.attempted` telemetry\n\n**Transitions:**\n| Condition | Exit Code | Next State |\n|-----------|-----------|-----------|\n| Claim succeeded | 0 | BUILDING |\n| Race lost (already claimed) | 4 | RETRYING |\n| Bead no longer claimable (closed, deferred) | 1 | SELECTING |\n| Bead store error | >0 | SELECTING (after backoff) |\n| Max retries exceeded | — | SELECTING (exclude this bead, reset retry counter) |\n\n### RETRYING\n\n**Entry:** A claim attempt failed due to race condition.\n\n**Actions:**\n1. Increment retry counter for this selection cycle\n2. Add failed bead ID to exclusion set\n3. Emit `bead.claim.race_lost` telemetry\n\n**Transitions:**\n| Condition | Next State |\n|-----------|-----------|\n| Retry count < max_retries (default: 5) | CLAIMING (with next candidate from same strand) |\n| Retry count >= max_retries | SELECTING (reset, move to next strand) |\n\n### BUILDING\n\n**Entry:** Bead is claimed by this worker.\n\n**Actions:**\n1. Read full bead context: title, body, dependencies, labels, workspace path\n2. Read workspace context: CLAUDE.md, AGENTS.md, .beads/config.yaml\n3. Construct prompt from template (deterministic: same bead → same prompt)\n4. Include bead ID and `br close <id>` instruction in prompt\n5. Emit `prompt.built` telemetry (bead ID, prompt hash, token estimate)\n\n**Transitions:**\n| Condition | Next State |\n|-----------|-----------|\n| Prompt built successfully | DISPATCHING |\n| Bead context unreadable | HANDLING (outcome: failure, release bead) |\n\n### DISPATCHING\n\n**Entry:** Prompt is ready.\n\n**Actions:**\n1. Load agent adapter configuration (YAML)\n2. Resolve invoke template with prompt, workspace path, environment\n3. Start agent process via rendered command\n4. Record process PID, start time\n5. Emit `agent.dispatched` telemetry (agent name, model, workspace)\n\n**Transitions:**\n| Condition | Next State |\n|-----------|-----------|\n| Agent process started | EXECUTING |\n| Agent binary not found | HANDLING (outcome: failure, release bead) |\n| Adapter config invalid | HANDLING (outcome: failure, release bead) |\n\n### EXECUTING\n\n**Entry:** Agent process is running.\n\n**Actions:**\n1. Wait for agent process to exit\n2. Capture stdout, stderr, exit code\n3. Monitor execution timeout\n4. Continue emitting heartbeats while waiting\n5. Emit `agent.executing` heartbeat telemetry periodically\n\n**Transitions:**\n| Condition | Exit Code | Next State |\n|-----------|-----------|-----------|\n| Agent exited normally | any | HANDLING |\n| Execution timeout exceeded | — | Kill process → HANDLING (outcome: timeout) |\n| Shutdown signal received | — | Kill process → HANDLING (outcome: interrupted) |\n\n### HANDLING\n\n**Entry:** Agent has exited (or was killed). This is where outcome routing happens.\n\n**Actions:**\n1. Classify outcome by exit code\n2. Execute the handler for that outcome class\n3. Emit `bead.outcome` telemetry\n\n**Outcome Table:**\n\n| Outcome | Exit Code | Handler | Bead Action |\n|---------|-----------|---------|-------------|\n| **Success** | 0 | Verify bead was closed by agent. If not, log warning (do not auto-close). | None (agent owns closure) |\n| **Failure** | 1 | Evaluate for mitosis (see Mitosis section). If splittable, split and block parent. If not, release bead (`br update --status open --unassign`). Increment failure count via label. | Split or released |\n| **Timeout** | 124 | Release bead. Add `deferred` label. | Released + deferred |\n| **Crash** | >128 (signal) | Release bead. Create alert bead in workspace. | Released + alert |\n| **Race Lost** | 4 | (Handled at CLAIMING, should not reach here) | N/A |\n| **Interrupted** | — | Release bead. Clean shutdown. | Released |\n| **Agent Not Found** | 127 | Release bead. Emit error. Do not retry (config issue). | Released |\n| **Build Failure** | — | Release bead. Emit error. | Released |\n\n**Agent-owned closure:** NEEDLE does not close beads. The agent is instructed (via prompt) to run `br close <id>` upon successful completion. If the bead is still open after a success exit code, NEEDLE logs a warning but does not intervene. This is a deliberate design choice based on operational experience (see `docs/notes/bead-lifecycle-bugs.md`).\n\n**Transitions:**\n| Condition | Next State |\n|-----------|-----------|\n| Outcome processed | LOGGING |\n\n### LOGGING\n\n**Entry:** Outcome has been handled.\n\n**Actions:**\n1. Record effort: elapsed time, exit code, token count (if extractable), estimated cost\n2. Emit `bead.completed` or `bead.released` telemetry\n3. Update worker state registry (beads processed, current streak)\n4. Reset retry counter and exclusion set\n\n**Transitions:**\n| Condition | Next State |\n|-----------|-----------|\n| Logging complete | SELECTING |\n\n### EXHAUSTED\n\n**Entry:** All strands returned no work.\n\n**Actions:**\n1. Emit `worker.exhausted` telemetry\n2. If `idle_timeout` configured, start countdown\n3. If `idle_action` is `wait`, sleep with exponential backoff (max 60s)\n4. If `idle_action` is `exit`, terminate\n\n**Transitions:**\n| Condition | Next State |\n|-----------|-----------|\n| Backoff expired, retry strands | SELECTING |\n| Idle timeout exceeded | STOPPED |\n| Shutdown signal received | STOPPED |\n\n### STOPPED\n\n**Entry:** Graceful shutdown.\n\n**Actions:**\n1. Release any claimed bead\n2. Deregister from worker state registry\n3. Stop heartbeat emitter\n4. Emit `worker.stopped` telemetry\n5. Exit process\n\n**Transitions:** None (terminal).\n\n### ERRORED\n\n**Entry:** Unrecoverable error.\n\n**Actions:**\n1. Release any claimed bead (best-effort)\n2. Emit `worker.errored` telemetry with error details\n3. Deregister from worker state registry (best-effort)\n4. Exit process with non-zero code\n\n**Transitions:** None (terminal).\n\n## Error Model\n\nErrors are classified into three tiers:\n\n### Tier 1: Transient (retry)\n\nTemporary failures that resolve on their own. The worker retries with backoff.\n\n- Bead store temporarily unreachable\n- Claim race lost\n- Lock contention timeout\n- Agent timeout (may succeed on re-dispatch)\n\n### Tier 2: Bead-scoped (release and continue)\n\nFailures specific to one bead. Release it and move on.\n\n- Agent exited with failure\n- Prompt build failed (bead context unreadable)\n- Agent binary missing\n\n### Tier 3: Worker-scoped (exit)\n\nFailures that affect the worker's ability to function. Exit and let the fleet manager handle it.\n\n- Configuration invalid\n- Bead store persistently unreachable\n- Filesystem full\n- Heartbeat file unwritable\n\n## Invariants\n\nThese must hold at all times. Violation of any invariant is a bug.\n\n1. **A worker holds at most one claimed bead.** There is no pipelining or parallel execution within a single worker.\n\n2. **A claimed bead is always released.** Every path through HANDLING releases the bead unless the agent closed it. There is no path where a bead remains claimed after the worker moves to SELECTING.\n\n3. **Heartbeat is continuous.** From BOOTING to STOPPED/ERRORED, the worker emits heartbeats. A gap in heartbeats means the worker is stuck or dead.\n\n4. **Telemetry is emitted for every state transition.** Silent transitions do not exist.\n\n5. **The exclusion set is bounded.** It is cleared on every transition to SELECTING. It cannot grow unboundedly within a selection cycle because max_retries is finite.\n\n6. **Shutdown is always graceful when possible.** SIGTERM triggers STOPPED, not ERRORED. Only SIGKILL causes ungraceful termination, and heartbeat TTL handles that case.\n\n---\n\n# Architecture\n\n## Module Boundaries\n\nNEEDLE is organized into crates (Rust) or packages (Go) with strict dependency rules. No circular dependencies. Each module has a single responsibility.\n\n```\nneedle (binary)\n├── cli/              CLI parsing, session management\n├── worker/           Worker loop, state machine\n├── strand/           Strand waterfall evaluation\n│   └── splice/       Worker failure documentation\n├── claim/            Atomic claiming, lock management\n├── prompt/           Prompt construction from bead context\n├── dispatch/         Agent adapter loading, process execution\n├── outcome/          Exit code classification, outcome handlers\n├── commit_hook/      Bead-Id trailer injection for git commits\n├── telemetry/        Structured event emission, sinks\n├── health/           Heartbeat, stuck detection, peer monitoring\n├── config/           Hierarchical configuration loading\n├── bead_store/       Abstract bead backend interface\n└── types/            Shared types, error definitions\n```\n\n### Dependency Graph\n\n```\ncli ──► worker ──► strand ──► bead_store\n                │           │\n                │           └──► splice ──► bead_store\n                │                               ├──► telemetry\n                │                               └──► health\n                │\n                ├──► claim ─┘\n                │\n                ├──► prompt ──► bead_store\n                │\n                ├──► dispatch\n                │\n                ├──► outcome ──► bead_store\n                │               ├──► telemetry\n                │               └──► health\n                │\n                ├──► commit_hook ──► types\n                │\n                ├──► telemetry\n                │\n                └──► health ──► telemetry\n\nconfig ◄── (all modules)\ntypes  ◄── (all modules)\n```\n\n**Rule:** Arrows point from dependent to dependency. No module depends on `cli` or `worker` except through the binary entry point. `telemetry`, `config`, and `types` are leaf dependencies available to all modules.\n\n## Data Flow\n\n### Primary Loop\n\n```\nbead_store ──[candidates]──► strand ──[bead_id]──► claim ──[claimed_bead]──►\nprompt ──[prompt_string]──► dispatch ──[process]──► worker(wait) ──►\noutcome ──[result]──► bead_store + telemetry\n```\n\n### Telemetry Flow\n\n```\n                    ┌─────────────────────────┐\n                    │    Telemetry Collector   │\n                    └────────────┬────────────┘\n                                 │\n              ┌──────────────────┼──────────────────┐\n              ▼                  ▼                   ▼\n        ┌──────────┐     ┌────────────┐      ┌──────────┐\n        │ File Sink│     │ Stdout Sink│      │ Hook Sink│\n        │ (JSONL)  │     │ (human)    │      │ (webhook)│\n        └──────────┘     └────────────┘      └──────────┘\n```\n\n### Configuration Flow\n\n```\n  CLI args ──► env vars ──► workspace .needle.yaml ──► global ~/.needle/config.yaml ──► defaults\n  (highest)                                                                              (lowest)\n```\n\n## Module Specifications\n\n### bead_store\n\nAbstract interface to any bead backend. The primary implementation wraps the `br` CLI, but the trait allows future backends (direct SQLite, HTTP API, etc.).\n\n```\ntrait BeadStore {\n    fn ready(workspace: &Path, filters: &Filters) -> Result<Vec<Bead>>\n    fn show(id: &BeadId) -> Result<Bead>\n    fn claim(id: &BeadId, actor: &str) -> Result<ClaimResult>\n    fn release(id: &BeadId) -> Result<()>\n    fn labels(id: &BeadId) -> Result<Vec<String>>\n    fn add_label(id: &BeadId, label: &str) -> Result<()>\n    fn doctor_repair() -> Result<RepairReport>\n}\n\nenum ClaimResult {\n    Claimed(Bead),\n    RaceLost { claimed_by: String },\n    NotClaimable { reason: String },\n}\n```\n\n**Design notes:**\n- All methods return `Result`. Silent failures do not exist.\n- `ClaimResult` is an enum, not a boolean. The caller must handle each variant.\n- `ready()` accepts filters (status, assignee, labels, workspace) to push filtering to the backend.\n- The `br` CLI implementation shells out to `br` with `--json` and parses output via `serde_json`.\n- JSON parsing failures are explicit errors, not empty results (learned from starvation false positives).\n\n### claim\n\nWraps `bead_store.claim()` with workspace-level serialization and retry logic.\n\n```\nstruct Claimer {\n    bead_store: Box<dyn BeadStore>,\n    lock_dir: PathBuf,       // per-workspace flock directory\n    max_retries: u32,        // default: 5\n    retry_backoff_ms: u64,   // default: 100\n}\n\nimpl Claimer {\n    fn claim_next(\n        &self,\n        candidates: &[Bead],\n        actor: &str,\n        exclusions: &HashSet<BeadId>,\n    ) -> Result<ClaimOutcome>\n}\n\nenum ClaimOutcome {\n    Claimed(Bead),\n    AllRaceLost,\n    NoCandidates,\n    StoreError(Error),\n}\n```\n\n**Design notes:**\n- The flock is per-workspace, not per-bead. This serializes all claim operations within a workspace, preventing thundering herd (learned from `docs/notes/claim-race-conditions.md`).\n- The lock is held only for the duration of the `br update --claim` call, not for the entire bead execution.\n- Retry logic is internal to the Claimer. The caller receives a final `ClaimOutcome`.\n\n### strand\n\nEvaluates the strand waterfall and returns the next action.\n\n```\ntrait Strand {\n    fn name(&self) -> &str\n    fn enabled(&self, config: &Config) -> bool\n    fn evaluate(&self, context: &WorkerContext) -> Result<StrandResult>\n}\n\nenum StrandResult {\n    BeadFound(Vec<Bead>),    // candidates for claiming\n    WorkCreated,              // strand created new beads (e.g., weave)\n    NoWork,                   // fall through to next strand\n    Error(StrandError),       // strand failed, fall through\n}\n```\n\nEach strand implements the trait. The runner evaluates them in order:\n\n```\nfn run_strands(strands: &[Box<dyn Strand>], ctx: &WorkerContext) -> StrandWaterfallResult {\n    for strand in strands {\n        if !strand.enabled(&ctx.config) { continue; }\n        match strand.evaluate(ctx)? {\n            StrandResult::BeadFound(candidates) => return Ok(candidates),\n            StrandResult::WorkCreated => return Ok(/* re-evaluate from strand 1 */),\n            StrandResult::NoWork => continue,\n            StrandResult::Error(e) => { emit_telemetry(e); continue; }\n        }\n    }\n    StrandWaterfallResult::Exhausted\n}\n```\n\n### dispatch\n\nLoads agent adapters and executes the agent process.\n\n```\nstruct Dispatcher {\n    adapters: HashMap<String, AgentAdapter>,\n}\n\nstruct AgentAdapter {\n    name: String,\n    invoke_template: String,   // e.g., \"cd {workspace} && claude --print\"\n    input_method: InputMethod,  // Stdin, File, Args\n    timeout: Duration,\n    environment: HashMap<String, String>,\n}\n\nenum InputMethod {\n    Stdin,                      // pipe prompt to stdin\n    File { path_template: String },  // write prompt to file, pass path\n    Args { flag: String },      // pass prompt as --flag value\n}\n\nstruct ExecutionResult {\n    exit_code: i32,\n    stdout: String,\n    stderr: String,\n    elapsed: Duration,\n    pid: u32,\n}\n```\n\n**Design notes:**\n- Adapters are loaded from YAML config files. Adding a new agent requires only a new YAML file.\n- The invoke template is rendered with variables: `{workspace}`, `{prompt_file}`, `{bead_id}`, `{model}`.\n- The dispatcher does not interpret agent output. It captures raw exit code, stdout, and stderr, then passes them to the outcome handler.\n- Timeout is enforced by the dispatcher, not the agent. If the agent exceeds the timeout, the dispatcher kills the process and returns exit code 124.\n\n### outcome\n\nClassifies the agent's exit and routes to the appropriate handler.\n\n```\nenum Outcome {\n    Success,           // exit 0\n    Failure,           // exit 1\n    Timeout,           // exit 124 (set by dispatcher)\n    Crash(i32),        // exit >128 (signal)\n    AgentNotFound,     // exit 127\n    Interrupted,       // shutdown signal during execution\n}\n\nfn classify(result: &ExecutionResult, was_interrupted: bool) -> Outcome {\n    if was_interrupted { return Outcome::Interrupted; }\n    match result.exit_code {\n        0   => Outcome::Success,\n        1   => Outcome::Failure,\n        124 => Outcome::Timeout,\n        127 => Outcome::AgentNotFound,\n        c if c > 128 => Outcome::Crash(c),\n        _   => Outcome::Failure,  // treat unknown codes as failure\n    }\n}\n```\n\n**Design notes:**\n- The match is exhaustive. Every exit code maps to exactly one outcome.\n- The `Outcome` enum is the sole input to the handler. There is no ad-hoc exit code checking elsewhere.\n- `Outcome::Success` does NOT mean the bead is closed. It means the agent exited cleanly. Bead closure is the agent's responsibility.\n\n### telemetry\n\n```\nfn emit(event: TelemetryEvent)\n\nstruct TelemetryEvent {\n    timestamp: DateTime<Utc>,\n    worker_id: String,\n    event_type: String,       // e.g., \"bead.claim.attempted\"\n    bead_id: Option<BeadId>,\n    workspace: Option<PathBuf>,\n    data: serde_json::Value,  // event-specific payload\n    duration_ms: Option<u64>,\n    trace_id: Option<TraceId>,   // W3C trace ID of enclosing span, if OTLP sink enabled\n    span_id: Option<SpanId>,     // W3C span ID of enclosing span, if OTLP sink enabled\n}\n\ntrait Sink: Send + Sync {\n    fn accept(&self, event: &TelemetryEvent) -> Result<()>;\n    fn flush(&self, deadline: Duration) -> Result<()>;\n}\n\n// Built-in sinks: FileSink, StdoutSink, HookSink, OtlpSink.\n// OtlpSink wraps the OpenTelemetry SDK (traces + metrics + logs providers)\n// and translates TelemetryEvent into the appropriate signal per the\n// Semantic Mapping table in the Telemetry chapter.\n```\n\n### health\n\n```\nstruct HealthMonitor {\n    heartbeat_interval: Duration,    // default: 30s\n    heartbeat_ttl: Duration,         // default: 5min\n    heartbeat_dir: PathBuf,          // ~/.needle/state/heartbeats/\n    peer_check_interval: Duration,   // default: 60s\n}\n\nimpl HealthMonitor {\n    fn emit_heartbeat(&self, state: &WorkerState) -> Result<()>\n    fn check_peers(&self) -> Result<Vec<PeerStatus>>\n    fn cleanup_stale_claims(&self, store: &dyn BeadStore) -> Result<u32>\n}\n\nenum PeerStatus {\n    Alive { last_seen: DateTime<Utc>, current_bead: Option<BeadId> },\n    Stale { last_seen: DateTime<Utc>, claimed_bead: Option<BeadId> },\n    Dead { heartbeat_file: PathBuf },\n}\n```\n\n### commit_hook\n\nInjects `Bead-Id:` trailers into git commits after successful bead closure, for HOOP bead_commit_index integration.\n\n```\nasync fn inject_bead_id_trailer(\n    workspace: &Path,\n    bead_id: &BeadId,\n    pre_dispatch_head: &str,\n) -> Result<()>\n\nfn git_head(workspace: &str) -> Result<String>\n```\n\n**Functionality:**\n- When a bead closes with a commit artifact (agent made commits), NEEDLE amends the latest commit to include a `Bead-Id: <id>` trailer\n- Only acts when HEAD moved since `pre_dispatch_head` (i.e. the agent made at least one commit)\n- Idempotent: checks if trailer is already present before injecting\n- Returns `Ok(())` in all no-op cases (not a git repo, no new commits, trailer already present)\n\n**Trailer format:**\n```\nBead-Id: nd-a3f8\n```\n\n**Integration context:**\n- HOOP's `bead_commit_index` picks up the trailer via `git log --format=%(trailers:key=Bead-Id,valueonly,separator=,)`\n- Enables bidirectional traceability: beads → commits and commits → beads\n- Executed after successful bead close, before returning to SELECTING state\n\n**Timeouts:**\n- `git rev-parse HEAD`: 10s timeout\n- `git commit --amend`: 30s timeout\n\n**Design notes:**\n- Errors are logged as non-fatal warnings; they do not fail the bead processing cycle\n- The trailer is appended via `git commit --amend --no-edit --trailer \"Bead-Id: <id>\"`\n- Multiple beads can be tracked in a single commit (comma-separated in trailer value)\n\n## Binary Structure\n\nNEEDLE is a single binary with subcommands:\n\n```\nneedle run [--workspace PATH] [--agent NAME] [--count N] [--identifier NAME]\nneedle stop [--all | --identifier NAME]\nneedle list [--format table|json]\nneedle attach <identifier>\nneedle status [--format table|json]\nneedle config [--get KEY | --set KEY VALUE]\nneedle doctor [--repair]\nneedle version\n```\n\n### Session Management\n\n`needle run` creates tmux sessions for each worker. Session naming follows the pattern:\n\n```\nneedle-{agent}-{provider}-{model}-{identifier}\n```\n\nExamples:\n```\nneedle-claude-anthropic-sonnet-alpha\nneedle-opencode-alibaba-qwen-bravo\nneedle-codex-openai-gpt4-charlie\n```\n\n`--count=N` launches N workers with sequential NATO alphabet identifiers (alpha, bravo, charlie, ...). Workers are launched with staggered delay (default: 2s between launches) to prevent thundering herd on startup (learned from `docs/notes/operational-fleet-lessons.md`).\n\n### CLI Help System\n\nEvery subcommand and flag is discoverable via `--help` or `-h`. Help text is embedded in the binary and generated from the same source as the CLI parser (e.g., `clap` derive macros in Rust).\n\n**Top-level help:**\n\n```\n$ needle --help\n\nNEEDLE — Navigates Every Enqueued Deliverable, Logs Effort\n\nDeterministic bead processing with explicit outcome paths.\n\nUsage: needle <COMMAND>\n\nCommands:\n  run          Launch worker(s) to process beads\n  stop         Stop running worker(s)\n  list         List active workers\n  attach       Attach to a worker's tmux session\n  status       Show fleet status, bead counts, and cost summary\n  config       View or modify configuration\n  doctor       Check system health and repair\n  test-agent   Validate an agent adapter\n  logs         Query telemetry logs\n  rollback     Roll back to previous stable binary\n  version      Show version information\n  help         Print this message or the help of a subcommand\n\nOptions:\n  -h, --help     Print help\n  -V, --version  Print version\n```\n\n**Subcommand help (example):**\n\n```\n$ needle run --help\n\nLaunch worker(s) to process beads\n\nUsage: needle run [OPTIONS]\n\nOptions:\n  -w, --workspace <PATH>     Workspace to process beads from [default: config value]\n  -a, --agent <NAME>         Agent adapter to use [default: config value]\n  -c, --count <N>            Number of workers to launch [default: 1]\n  -i, --identifier <NAME>    Worker identifier (overrides NATO naming)\n  -t, --timeout <SECONDS>    Agent execution timeout [default: config value]\n      --resume               Resume an existing worker session (used by hot-reload)\n  -h, --help                 Print help\n```\n\n**Design notes:**\n- Every flag has a one-line description\n- Default values shown in brackets (sourced from config)\n- Subcommand grouping follows the lifecycle: launch → monitor → operate → maintain\n- `needle help <command>` and `needle <command> --help` are equivalent\n- Help output is plain text, no colors, suitable for piping to other tools or agents\n\n---\n\n# Strand Waterfall\n\nStrands are NEEDLE's strategy for finding work. They are evaluated in strict sequence — the first strand that yields actionable work wins. When a strand returns `NoWork`, the worker falls through to the next.\n\nThe waterfall is the answer to \"what does a worker do when it has no beads?\" It is not a priority system for beads (that's handled by deterministic ordering within each strand). It is a priority system for *strategies*.\n\n## Waterfall Sequence\n\n```\n  Strand 1: PLUCK ──── primary work from assigned workspace\n       │ no work\n       ▼\n  Strand 2: MEND ───── cleanup: stale claims, orphaned locks, health\n       │ nothing to clean\n       ▼\n  Strand 3: EXPLORE ── look for work in other configured workspaces\n       │ no work\n       ▼\n  Strand 4: WEAVE ──── create beads from documentation gaps (opt-in)\n       │ no gaps or disabled\n       ▼\n  Strand 5: UNRAVEL ── propose alternatives for HUMAN-blocked beads (opt-in)\n       │ none or disabled\n       ▼\n  Strand 6: PULSE ──── codebase health scan, auto-generate beads (opt-in)\n       │ no issues or disabled\n       ▼\n  Strand 7: REFLECT ── consolidate learnings from recent beads\n       │ consolidation complete or not needed\n       ▼\n  Strand 8: SPLICE ──── worker failure documentation\n       │ no failures\n       ▼\n  Strand 9: KNOT ───── alert human, enter backoff\n       │\n       ▼\n  → EXHAUSTED (backoff and retry from Strand 1)\n```\n\n## Strand 1: Pluck\n\n**Purpose:** Process beads from the worker's assigned workspace. This is the primary work strand and will handle >90% of all bead processing.\n\n**Invokes agent:** Yes.\n\n**Entry condition:** Worker has an assigned workspace with a `.beads/` directory.\n\n**Algorithm:**\n1. Query bead store: `br ready --unassigned --json` in workspace\n2. Filter: exclude beads with labels `deferred`, `human`, `blocked`\n3. Filter: exclude beads in the current retry exclusion set\n4. Sort: priority (ascending, 0 = highest), then creation time (ascending, oldest first)\n5. Return sorted candidates for claiming\n\n**Exit conditions:**\n| Result | Action |\n|--------|--------|\n| Candidates found | Return `BeadFound(candidates)` → worker proceeds to CLAIMING |\n| No candidates (queue empty) | Return `NoWork` → fall through to Strand 2 |\n| Bead store error | Emit telemetry, return `Error` → fall through to Strand 2 |\n\n**Determinism guarantee:** The sort key `(priority, created_at)` produces the same ordering for all workers viewing the same queue state. Workers will compete for the same top-priority bead, and the claim mechanism resolves contention.\n\n## Strand 2: Mend\n\n**Purpose:** Maintenance and cleanup operations that keep the bead store healthy. Runs before Explore because cleaning up stale claims or broken dependencies in the home workspace may unblock beads here — no need to roam if local work is just stuck.\n\n**Invokes agent:** No.\n\n**Entry condition:** Strand 1 returned no work.\n\n**Algorithm:**\n1. **Stale claim cleanup:** Find beads with status `in_progress` where the assigned worker has no active heartbeat (TTL expired). Release them.\n2. **Orphaned lock cleanup:** Find workspace lock files older than TTL. Remove them.\n3. **Dependency cleanup:** Find closed beads that are still listed as blockers on open beads. Remove the stale dependency links.\n4. **Database health:** Run `br doctor` (not `--repair` unless errors found).\n\n**Exit conditions:**\n| Result | Action |\n|--------|--------|\n| Cleanup performed | Return `WorkCreated` → restart from Strand 1 (released beads may now be claimable) |\n| Nothing to clean | Return `NoWork` → fall through to Strand 3 |\n\n**Design notes (from `docs/notes/bead-lifecycle-bugs.md`):**\n- Stale dependency links caused permanent blocking in NEEDLE-deprecated. Mend must clean these.\n- Distinguish \"did work\" from \"found nothing\" — v1 had an infinite loop where mend returned success on failed releases.\n\n## Strand 3: Explore\n\n**Purpose:** Discover work in other configured workspaces when the home workspace is empty and clean.\n\n**Invokes agent:** No. Explore only finds candidates — execution happens back through the standard CLAIMING → DISPATCHING flow.\n\n**Entry condition:** Strands 1-2 returned no work. Explore is enabled in config. At least one additional workspace is configured.\n\n**Algorithm:**\n1. Read configured workspace list from config (explicit paths, no filesystem scanning)\n2. For each workspace (in configured order):\n   a. Check `.beads/` directory exists\n   b. Query `br ready --unassigned --json`\n   c. If candidates found, return them with workspace context\n3. If no workspace has work, return `NoWork`\n\n**Exit conditions:**\n| Result | Action |\n|--------|--------|\n| Candidates found in another workspace | Return `BeadFound(candidates)` with workspace override |\n| No candidates in any workspace | Return `NoWork` → fall through to Strand 4 |\n\n**Design notes (from `docs/notes/explore-strand-bugs.md`):**\n- **No filesystem scanning.** NEEDLE-deprecated's `find`-based discovery caused 35+ CPU load with 40 workers. Workspaces must be explicitly configured.\n- **No upward traversal.** The v1 explore strand walked up parent directories to `/home`, then `/`. This is eliminated.\n- **Workspace list is static** for the duration of a session. It is read from config at boot and not re-evaluated.\n- **Workers do not permanently relocate.** If a worker finds work in another workspace, it processes that bead and returns to its home workspace for the next cycle.\n\n## Strand 4: Weave (opt-in)\n\n**Purpose:** Analyze workspace documentation for gaps and create new beads to address them.\n\n**Invokes agent:** Yes — uses the agent to analyze documentation and propose beads.\n\n**Entry condition:** Strands 1-3 (Pluck, Mend, Explore) returned no work. Weave is explicitly enabled in workspace config (`strands.weave.enabled: true`).\n\n**Algorithm:**\n1. Identify documentation files (README, AGENTS.md, docs/, etc.)\n2. Dispatch agent with gap-analysis prompt\n3. Agent proposes new beads (as structured output)\n4. Create beads via bead store\n5. Return `WorkCreated` → restart from Strand 1\n\n**Guardrails (from `docs/notes/self-modification-risks.md`):**\n- **Max beads per weave run:** Configurable, default 5. Prevents unbounded bead creation.\n- **Cooldown period:** Minimum time between weave runs per workspace, default 24h.\n- **Seen-issues deduplication:** Track previously created weave beads to prevent duplicates.\n- **Workspace exclusion:** Weave is disabled for NEEDLE's own workspace by default. Workers must not create work for their own orchestrator without human approval.\n- **Human review label:** Weave-created beads are labeled `weave-generated` for easy filtering.\n\n**Exit conditions:**\n| Result | Action |\n|--------|--------|\n| Beads created | Return `WorkCreated` → restart from Strand 1 |\n| No gaps found | Return `NoWork` → fall through to Strand 5 |\n| Disabled | Return `NoWork` → fall through to Strand 5 |\n\n## Strand 5: Unravel (opt-in)\n\n**Purpose:** For beads labeled `human` (requiring human decision), propose alternative approaches that an agent could execute instead.\n\n**Invokes agent:** Yes — uses the agent to analyze the blocked bead and propose workarounds.\n\n**Entry condition:** Strands 1-4 returned no work. Unravel is explicitly enabled. There are beads with `human` label in the workspace.\n\n**Algorithm:**\n1. Query beads with `human` label\n2. For each (up to `max_unravel_per_run`, default 3):\n   a. Dispatch agent with the bead context and a prompt asking for alternative approaches\n   b. If agent proposes viable alternatives, create child beads with `alternative` label\n   c. Do NOT close or modify the original `human` bead\n3. Return `WorkCreated` if alternatives were created\n\n**Guardrails:**\n- Original `human` bead is never modified or closed\n- Alternative beads are linked as children (informational, not blocking)\n- Max alternatives per `human` bead: configurable, default 2\n- Cooldown: don't re-analyze a `human` bead that was analyzed within the last 7 days\n\n**Exit conditions:**\n| Result | Action |\n|--------|--------|\n| Alternatives created | Return `WorkCreated` → restart from Strand 1 |\n| No `human` beads or no alternatives viable | Return `NoWork` → fall through to Strand 6 |\n| Disabled | Return `NoWork` → fall through to Strand 6 |\n\n## Strand 6: Pulse (opt-in)\n\n**Purpose:** Scan the codebase for health issues (stale TODOs, missing tests, dependency drift, linting) and create beads for significant findings.\n\n**Invokes agent:** Yes — uses the agent (or external tools) to scan the codebase.\n\n**Entry condition:** Strands 1-5 returned no work. Pulse is explicitly enabled. Cooldown has expired.\n\n**Algorithm:**\n1. Run configured scanners (linters, test coverage, dependency checkers, TODO scanners)\n2. Compare results against previous scan (stored in `~/.needle/state/pulse/`)\n3. For new issues exceeding severity threshold, create beads\n4. Update last-scan state\n\n**Guardrails:**\n- **Max beads per pulse run:** Configurable, default 10\n- **Cooldown:** Default 48h between scans\n- **Severity threshold:** Only create beads for issues above configured severity\n- **Deduplication:** Track seen issues to prevent duplicate beads across scans\n- **Workspace exclusion:** Same as Weave — disabled for NEEDLE's own workspace by default\n\n**Exit conditions:**\n| Result | Action |\n|--------|--------|\n| Beads created | Return `WorkCreated` → restart from Strand 1 |\n| No new issues | Return `NoWork` → fall through to Strand 7 |\n| Disabled | Return `NoWork` → fall through to Strand 7 |\n\n## Strand 7: Reflect (opt-in)\n\n**Purpose:** Consolidate learnings from recent bead work into a shared knowledge base (`.beads/learnings.md`), promoting recurring patterns to reusable skill files. This meta-analysis strand ensures that insights from completed work are captured and made available to future work.\n\n**Invokes agent:** Yes — uses a consolidation-specific prompt.\n\n**Entry condition:** Strands 1-6 returned no work. Reflect is explicitly enabled in workspace config (`strands.reflect.enabled: true`). At least N beads have been closed since last consolidation (configurable, default: 10). At least T hours since last consolidation (configurable, default: 24).\n\n**Algorithm (KAIROS-inspired four-phase cycle):**\n\n1. **Orient:** Read current `.beads/learnings.md` and existing skill files in `.beads/skills/`. Check file sizes to ensure they're within bounds.\n2. **Gather:** Read bead close bodies from `.beads/issues.jsonl` for beads closed since last consolidation. Read available traces for failed beads to capture failure patterns.\n3. **Consolidate:**\n   - Extract retrospective blocks from close bodies\n   - Identify patterns across multiple beads (same failure mode, same codebase quirk, workaround that works)\n   - Merge new learnings into `.beads/learnings.md`, deduplicating against existing entries\n   - Convert relative references to absolute (bead IDs, dates)\n   - If a learning appears 3+ times across different beads, promote to a skill file in `.beads/skills/`\n   - If a learning contradicts an existing entry, resolve in favor of the newer evidence\n4. **Prune:**\n   - Remove entries older than 90 days without reinforcement\n   - Compress similar entries into single entries\n   - Ensure total learnings stay under 80 entries (configurable)\n\n**Guardrails:**\n- **Cooldown:** Minimum 24 hours between consolidation runs (configurable)\n- **Max learnings created per run:** 10 (configurable)\n- **Max skills promoted per run:** 3 (configurable)\n- **Read-only on CLAUDE.md:** The consolidation agent receives the workspace CLAUDE.md as context but MUST NOT modify it. CLAUDE.md changes require explicit human approval.\n- **Workspace exclusion:** Reflect is disabled for NEEDLE's own workspace by default. Workers must not modify their own orchestrator's knowledge base without human approval.\n\n**Exit conditions:**\n| Result | Action |\n|--------|--------|\n| Consolidation performed | Return `WorkCreated` → restart from Strand 1 (learnings may unblock new work) |\n| Not enough data since last run | Return `NoWork` → fall through to Strand 8 |\n| Disabled or cooldown active | Return `NoWork` → fall through to Strand 8 |\n\n**Telemetry:**\n| Event Type | Emitted When | Data Fields |\n|------------|-------------|-------------|\n| `reflect.started` | Consolidation starts | `beads_since_last`, `current_learnings_count` |\n| `reflect.consolidated` | Consolidation completes | `learnings_added`, `learnings_pruned`, `skills_promoted`, `contradictions_resolved` |\n| `reflect.skipped` | Consolidation skipped | `reason` (cooldown, insufficient data, disabled) |\n\n**Learning persistence:** `.beads/learnings.md` is the authoritative source. Workers automatically append it to `context_files` during prompt building (via the Config module's `context_files` discovery). No manual config required — workers always see the latest learnings.\n\n**Session transcript analysis:** Reflect analyzes both bead close bodies (structured outcomes) and Claude Code session transcripts (decision-making process) when available. Transcripts are stored as JSONL in `.claude/projects/<project-hash>/<session-uuid>.jsonl` and contain richer signal: failed attempts, tool call sequences, recovery strategies, and decision points.\n\n**Integration with prompt building:** If `.beads/learnings.md` exists in a workspace, NEEDLE automatically appends it to `context_files` during prompt building. Workers always see the latest learnings without manual configuration.\n\n## Strand 8: Splice\n\n**Purpose:** Document worker failures (crashed workers and live-but-looping workers) by creating failure beads in a configured report workspace.\n\n**Invokes agent:** No.\n\n**Entry condition:** Strand 7 returned no work. Splice is enabled in config (default: true). Heartbeat files exist in the heartbeat directory.\n\n**Algorithm:**\n\n1. **Scan for dead workers (stale heartbeat + dead tmux session):**\n   - Read all heartbeat files from the heartbeat directory\n   - For each heartbeat older than `stale_threshold_secs` (default: 300s):\n     - Check if the tmux session is still alive\n     - If session is dead, this is a failed worker\n\n2. **Scan for live-but-looping workers (optional, when `detect_live_loops: true`):**\n   - For each worker with a fresh heartbeat:\n     - Read the tail of their JSONL log file\n     - Detect three loop patterns:\n       - **Claim churn:** Repeated `bead.claim.race_lost` events for the same bead\n       - **State ping-pong:** Rapid cycling between a small set of states without forward progress\n       - **Log runaway:** Excessive JSONL growth without `agent.completed` events\n\n3. **Create failure beads:**\n   - For each undocumented failure or loop pattern:\n     - Create a bead in the configured `report_workspace`\n     - Include worker details, session info, and evidence in the bead body\n   - Track documented sessions/loops in `splice_state.json` to prevent duplicates\n\n4. **Return `WorkCreated` if any beads were created, otherwise `NoWork`**\n\n**Exit conditions:**\n| Result | Action |\n|--------|--------|\n| Failure beads created | Return `WorkCreated` → restart from Strand 1 |\n| No new failures detected | Return `NoWork` → fall through to Strand 9 |\n\n**State persistence:** `splice_state.json` tracks which session IDs and loop patterns have already been documented, preventing duplicate failure beads for the same dead/looping worker.\n\n**Loop detection thresholds:**\n- `claim_churn_threshold`: Number of race-lost events for same bead before flagging (default: 20)\n- `log_runaway_bytes`: Max JSONL growth in `live_loop_window_secs` without completion (default: 10 MiB)\n- `live_loop_window_secs`: Time window for log runaway check (default: 300s)\n\n## Strand 9: Knot\n\n**Purpose:** All work-finding strategies are exhausted. Alert the human and enter backoff.\n\n**Invokes agent:** No.\n\n**Entry condition:** Strands 1-8 all returned `NoWork`.\n\n**Algorithm:**\n1. Determine alert state:\n   - **First time exhausted:** Emit `worker.idle` telemetry. Start backoff timer.\n   - **Repeated exhaustion (>N cycles):** Create alert bead (if not already created within cooldown).\n2. Verify before alerting (three-state check):\n   a. **No beads exist:** Queue is genuinely empty. Normal idle.\n   b. **All beads claimed:** Other workers are busy. Normal contention. Wait.\n   c. **Beads invisible:** Configuration error (wrong workspace, broken filter). Alert.\n3. Return `NoWork` → worker enters EXHAUSTED state with backoff\n\n**Guardrails (from `docs/notes/worker-starvation-lessons.md`):**\n- **Verify independently before alerting.** The v1 system had 100% false positive rate because it used the same broken code path for verification.\n- **Three-state model.** \"No work\" is three different conditions with different responses. Conflating them caused the false positive spiral.\n- **Rate limit alerts:** Max 1 alert bead per workspace per hour.\n- **Alert includes diagnostics:** Bead counts, worker count, claimed count, config snapshot.\n\n**Exit conditions:**\n| Result | Action |\n|--------|--------|\n| Always | Return `NoWork` → EXHAUSTED state |\n\n## Strand Configuration\n\n```yaml\n# ~/.needle/config.yaml or .needle.yaml\nstrands:\n  pluck:\n    enabled: true           # always on, cannot be disabled\n  explore:\n    enabled: true\n    workspaces:             # explicit list, no auto-discovery\n      - /home/coder/project-a\n      - /home/coder/project-b\n  mend:\n    enabled: true\n    stale_claim_ttl: 300    # seconds before a claimed bead is considered stale\n    lock_ttl: 600           # seconds before an orphaned lock is removed\n  weave:\n    enabled: false          # opt-in\n    max_beads_per_run: 5\n    cooldown_hours: 24\n    exclude_workspaces: []  # workspaces where weave is forbidden\n  unravel:\n    enabled: false          # opt-in\n    max_per_run: 3\n    cooldown_days: 7\n  pulse:\n    enabled: false          # opt-in\n    max_beads_per_run: 10\n    cooldown_hours: 48\n    severity_threshold: warning\n    scanners:\n      - name: todo-scanner\n        command: \"grep -rn 'TODO\\\\|FIXME' {workspace}/src\"\n      - name: test-coverage\n        command: \"cargo tarpaulin --skip-clean -o json\"\n  reflect:\n    enabled: true           # on by default (unlike weave/unravel/pulse)\n    min_beads_since_last: 10   # minimum closed beads before consolidation\n    cooldown_hours: 24\n    max_learnings_per_run: 10\n    max_skills_per_run: 3\n    learning_retention_days: 90\n    max_learnings: 80\n  splice:\n    enabled: true           # always on, cannot be disabled\n    stale_threshold_secs: 300   # seconds before heartbeat considered stale\n    report_workspace: null      # workspace for failure beads (null = current store)\n    detect_live_loops: true     # scan for stuck workers in JSONL tail\n    live_loop_scan_events: 200  # max events to scan per worker\n    claim_churn_threshold: 20   # race-lost events for same bead before flagging\n    log_runaway_bytes: 10485760 # 10 MiB, max growth without completion\n    live_loop_window_secs: 300   # time window for log runaway check\n  knot:\n    enabled: true           # always on, cannot be disabled\n    alert_cooldown_minutes: 60\n    exhaustion_threshold: 3 # cycles before creating alert bead\n```\n\n---\n\n# Mitosis\n\nMitosis is NEEDLE's mechanism for splitting a bead that represents multiple tasks into smaller, focused child beads. It is triggered on failure — when a bead fails execution, NEEDLE evaluates whether it should be decomposed before retrying.\n\n## Split Criteria\n\nA bead is splittable when it describes **multiple independent tasks**. This is a semantic determination, not a numeric one. The agent analyzes the bead and answers one question: \"Does this bead ask for more than one independent unit of work?\"\n\n**Valid reasons to split:**\n- The bead describes multiple distinct deliverables (\"add endpoint AND write migration AND update tests\")\n- The deliverables have a dependency relationship (migration before endpoint)\n- Each deliverable is independently closable\n\n**Not valid reasons to split:**\n- The bead is long (a single complex task can be long and still atomic)\n- The bead failed once (failure means the task is hard, not composite)\n- The bead has many acceptance criteria (criteria validate one task, not separate tasks)\n\nIf the agent determines the bead is a single task, mitosis does not apply. The bead is released for retry or deferred.\n\n## Child-Aware Deduplication\n\nBefore creating any child bead, NEEDLE reads the parent's existing children. If a previous mitosis pass already created children for this parent, the proposed children are compared against them. Matching children are skipped; only novel tasks are created.\n\n```\nBead fails\n    │\n    ▼\nAgent analyzes: \"Multiple independent tasks?\"\n    │\n    ├── No → Release for retry or defer\n    │\n    └── Yes → Propose N children with dependencies\n                │\n                ▼\n          Read parent's existing children\n          (br show <parent> --json → dependencies)\n                │\n          For each proposed child:\n                │\n                ├── Parent already has a child covering this? → Skip\n                │\n                └── Novel task → Create child, link as blocking parent\n\n          If any children created:\n                └── Parent remains in_progress, blocked by children\n          If all children already existed:\n                └── No-op (split already happened)\n```\n\nThis makes duplicate splits structurally impossible. The parent's child list is the single source of truth. A second worker encountering the same parent sees the existing children and creates nothing new.\n\n## Concurrency Safety\n\nMitosis uses the same per-workspace flock as the claiming protocol. The flock is held for the entire mitosis operation: read existing children → create new children → update parent dependencies. This serializes mitosis across workers within a workspace.\n\nIf two workers both hold a failed bead and attempt mitosis on the same parent simultaneously, the flock ensures one completes first. The second worker enters the flock, reads the children just created by the first, and skips all proposed children as duplicates.\n\n## When Mitosis Runs\n\nMitosis is evaluated in the HANDLING state when the outcome is **Failure** (exit code 1):\n\n1. Check if mitosis is enabled for the workspace (configurable, default: true)\n2. Check if this is the bead's **first failure** (mitosis runs once, not on every retry)\n3. Acquire workspace flock\n4. Dispatch agent with mitosis analysis prompt: bead context + \"Does this describe multiple tasks?\"\n5. If agent proposes children:\n   a. Read parent's existing children\n   b. Create only novel children with appropriate dependencies\n   c. Parent is blocked by children (remains claimed, status changes to blocked)\n6. Release workspace flock\n7. Emit `bead.mitosis` telemetry (children proposed, children created, children skipped)\n\nIf mitosis produces children, the parent is not released — it is blocked until its children complete. When all children are closed, the parent becomes unblocked and re-enters the queue for a final pass (or the mend strand clears the stale dependency and it resolves naturally).\n\nIf mitosis determines the bead is a single task, normal failure handling applies: release and increment failure count.\n\n## Mitosis Configuration\n\n```yaml\n# ~/.needle/config.yaml or .needle.yaml\nmitosis:\n  enabled: true                # enable/disable per workspace\n  first_failure_only: true     # only evaluate on first failure, not retries\n```\n\n## Telemetry\n\n| Event Type | Emitted When | Data Fields |\n|------------|-------------|-------------|\n| `bead.mitosis.evaluated` | Agent analyzed bead for splitting | `bead_id`, `splittable` (bool), `proposed_children` (count) |\n| `bead.mitosis.split` | Children created | `parent_id`, `children_created` (count), `children_skipped` (count), `child_ids` |\n| `bead.mitosis.skipped` | All proposed children already exist | `parent_id`, `existing_children` (count) |\n\n---\n\n# Concurrency\n\nMultiple NEEDLE workers operate in the same environment simultaneously. This section specifies how they coordinate without a central orchestrator.\n\n## Coordination Model\n\nNEEDLE uses **decentralized coordination through shared state**. There is no coordinator process, no leader election, no message passing between workers. All coordination happens through:\n\n1. **Atomic bead claims** (SQLite transactions via `br update --claim`)\n2. **Workspace-level flock** (POSIX file locks for claim serialization)\n3. **File-based heartbeats** (health monitoring and stale detection)\n4. **Worker state registry** (shared JSON file for fleet awareness)\n\nThis is approach #1 (SQLite transactions) from `docs/research/concurrency-approaches-compared.md`, augmented with file-based serialization to address the thundering herd problem.\n\n## Claiming Protocol\n\n### The Thundering Herd Problem\n\nWithout serialization, all workers compute the same priority ordering and race to claim the same top bead. N-1 workers lose, retry, compute the same ordering again, and race for the second bead. This wastes O(N^2) claim attempts.\n\n### Solution: Per-Workspace Flock\n\n```\n┌─────────────┐      ┌─────────────┐      ┌─────────────┐\n│  Worker A    │      │  Worker B    │      │  Worker C    │\n│  SELECT bead │      │  SELECT bead │      │  SELECT bead │\n└──────┬──────┘      └──────┬──────┘      └──────┬──────┘\n       │                     │                     │\n       ▼                     ▼                     ▼\n   ┌───────────────────────────────────────────────────┐\n   │          flock(/tmp/needle-claim-<workspace>.lock) │\n   │                                                    │\n   │  A enters ─► claim bead-1 ─► success ─► release   │\n   │  B enters ─► claim bead-2 ─► success ─► release   │\n   │  C enters ─► claim bead-3 ─► success ─► release   │\n   └───────────────────────────────────────────────────┘\n```\n\n**Protocol:**\n\n1. Worker computes candidate list (deterministic ordering)\n2. Worker acquires flock on workspace lock file (blocking, with timeout)\n3. Worker verifies top candidate is still claimable\n4. Worker executes `br update <id> --claim --actor <worker-id>`\n5. Worker releases flock\n6. If claim failed (race with non-NEEDLE claimer), retry with next candidate\n\n**Lock file path:** `/tmp/needle-claim-{workspace_hash}.lock` where `workspace_hash` is a deterministic hash of the workspace absolute path.\n\n**Lock timeout:** 10 seconds. If the lock cannot be acquired within this time, the worker skips this workspace and moves to the next strand.\n\n**Lock scope:** The lock is held only during the claim attempt (steps 2-5), not during bead execution. This means the lock is held for milliseconds, not minutes.\n\n## Heartbeat Protocol\n\nEvery worker emits a heartbeat file to enable peer monitoring and stale claim detection.\n\n### Heartbeat File\n\n```\n~/.needle/state/heartbeats/<worker-id>.json\n```\n\nContents:\n\n```json\n{\n  \"worker_id\": \"needle-claude-anthropic-sonnet-alpha\",\n  \"pid\": 12345,\n  \"state\": \"EXECUTING\",\n  \"current_bead\": \"nd-a3f8\",\n  \"workspace\": \"/home/coder/project\",\n  \"last_heartbeat\": \"2026-03-20T15:30:00Z\",\n  \"started_at\": \"2026-03-20T14:00:00Z\",\n  \"beads_processed\": 7,\n  \"session\": \"needle-claude-anthropic-sonnet-alpha\"\n}\n```\n\n### Emission\n\n- Heartbeat is emitted every `heartbeat_interval` (default: 30 seconds)\n- Emitted from a dedicated thread/task, independent of the main worker loop\n- Updates `last_heartbeat` timestamp and `state` field\n- File write is atomic (write to temp file, rename)\n\n### TTL and Stale Detection\n\nA heartbeat is **stale** if `now - last_heartbeat > heartbeat_ttl` (default: 5 minutes).\n\nA stale heartbeat means the worker has stopped updating — it has crashed, hung, or been killed.\n\n### Peer Monitoring\n\nThe Mend strand (Strand 2) checks peer heartbeats:\n\n1. Read all heartbeat files in `~/.needle/state/heartbeats/`\n2. For each stale heartbeat:\n   a. Check if the PID is still alive (`kill -0 <pid>`)\n   b. If PID is dead: worker crashed. Clean up.\n   c. If PID is alive but heartbeat is stale: worker is stuck. Log warning.\n3. For crashed workers:\n   a. Release any claimed bead\n   b. Remove heartbeat file\n   c. Deregister from worker state registry\n   d. Emit `peer.crashed` telemetry\n\n## Worker State Registry\n\nA shared file tracks all active workers for fleet-level awareness.\n\n```\n~/.needle/state/workers.json\n```\n\nContents:\n\n```json\n{\n  \"workers\": [\n    {\n      \"id\": \"needle-claude-anthropic-sonnet-alpha\",\n      \"pid\": 12345,\n      \"workspace\": \"/home/coder/project\",\n      \"agent\": \"claude\",\n      \"model\": \"sonnet\",\n      \"started_at\": \"2026-03-20T14:00:00Z\",\n      \"beads_processed\": 7\n    }\n  ],\n  \"updated_at\": \"2026-03-20T15:30:00Z\"\n}\n```\n\n**Access pattern:**\n- Workers register on startup, deregister on shutdown\n- Registry is updated via flock-protected read-modify-write\n- Used by `needle list`, `needle status`, and fleet-level telemetry\n- Not used for coordination — heartbeats handle that\n\n## Concurrency Limits\n\n### Provider/Model Limits\n\nRate limiting prevents API throttling and controls cost:\n\n```yaml\nlimits:\n  launch_stagger_seconds: 2          # delay between worker launches\n  providers:\n    anthropic:\n      max_concurrent: 10             # max workers using Anthropic simultaneously\n      requests_per_minute: 60\n    openai:\n      max_concurrent: 5\n      requests_per_minute: 40\n  models:\n    claude-sonnet:\n      max_concurrent: 8\n    claude-opus:\n      max_concurrent: 3              # expensive model, limit concurrency\n```\n\n**Enforcement:**\n- Before dispatching to an agent, the worker checks the provider/model concurrency counters\n- If at limit, the worker waits with backoff (not the same as strand exhaustion — there is work, just rate limited)\n- Counters are maintained in the worker state registry\n- RPM limits are enforced via a token bucket per provider (stored in `~/.needle/state/rate_limits/`)\n\n### Fleet Sizing\n\nThe practical worker limit is not an arbitrary number. It is driven by three runtime constraints:\n\n1. **Provider inference throughput.** Each worker waiting on an LLM response is idle CPU but an active API slot. If the provider rate-limits or queues requests, adding workers produces no additional throughput. NEEDLE tracks RPM per provider and warns when request latency exceeds a threshold.\n\n2. **Available CPU.** Each agent process (Claude Code, OpenCode, etc.) consumes CPU during tool execution, file I/O, and git operations. NEEDLE's own overhead (strand evaluation, heartbeat I/O, lock contention) also scales with worker count. When system load exceeds a configurable threshold, NEEDLE emits a `fleet.cpu_saturated` warning.\n\n3. **Available RAM.** Each agent process holds context in memory. Agent processes with large context windows or many tool calls can consume significant RAM. NEEDLE monitors system memory and warns when free memory drops below a threshold.\n\n`max_workers` is a configurable ceiling, not a recommendation. The right value depends on the environment:\n\n```yaml\nworker:\n  max_workers: 0              # 0 = no hard ceiling, rely on runtime monitoring\n  cpu_load_warn: 0.8          # warn when system load average > 80% of cores\n  memory_free_warn_mb: 512    # warn when free memory < 512MB\n```\n\nIf `max_workers` is set, it is enforced at launch time. `needle run --count=25` with `max_workers: 20` will launch 20 and log a warning. If set to 0, NEEDLE launches the requested count and relies on runtime monitoring to signal saturation.\n\n## Race Condition Prevention\n\nLessons from `docs/notes/claim-race-conditions.md`, applied to the new design:\n\n| Race Condition | v1 Impact | v2 Prevention |\n|---------------|-----------|---------------|\n| **Thundering herd** | All workers claim same bead | Per-workspace flock serializes claims |\n| **TOCTOU on closed beads** | Worker claims bead that was just closed | Verify bead status inside flock before claiming |\n| **Stale claims from crashed workers** | Beads stuck `in_progress` forever | Heartbeat TTL + Mend strand auto-release |\n| **Lock file leaks** | Orphaned locks block claims | Lock TTL + Mend strand cleanup |\n| **Concurrent bead creation** | (Weave/Pulse/Unravel) create duplicates | Seen-issue deduplication + creation cooldowns |\n\n## Concurrency Invariants\n\n1. **One claim at a time per workspace.** The flock guarantees this. Two workers cannot execute `br update --claim` simultaneously in the same workspace.\n\n2. **One bead per worker.** A worker holds at most one claimed bead. It releases or verifies closure before claiming another.\n\n3. **Claims have a TTL.** If a worker holds a claim for longer than `heartbeat_ttl` without updating its heartbeat, the claim is considered stale and eligible for release by Mend.\n\n4. **No implicit locking.** Labels are not locks. Bead status is not a lock. Only flock and `br update --claim` provide mutual exclusion.\n\n5. **Lock scope is minimal.** The workspace flock is held for milliseconds (duration of the `br` CLI call), never for the duration of bead execution.\n\n---\n\n# Telemetry\n\nEvery state transition, claim attempt, dispatch, and outcome emits structured telemetry. A silent worker is a broken worker.\n\n## Telemetry Design Principles\n\n1. **Structured from origin.** Events are typed structs, not log strings. They are serialized to JSONL for storage and consumption. There is no string parsing.\n\n2. **Separate from agent output.** Telemetry is written to NEEDLE's own sinks. It is never interleaved with agent stdout/stderr. This eliminates the stdout corruption bug class from v1 (see `docs/notes/bash-at-scale-problems.md`).\n\n3. **Non-blocking.** Telemetry emission never blocks the worker loop. If a sink is slow or failing, events are buffered and dropped after a threshold, not retried.\n\n4. **Complete.** Every state transition produces an event. If you reconstruct events for a worker, you can replay its entire session.\n\n## Event Schema\n\nAll events share a common envelope:\n\n```json\n{\n  \"timestamp\": \"2026-03-20T15:30:00.123Z\",\n  \"event_type\": \"bead.claim.attempted\",\n  \"worker_id\": \"needle-claude-anthropic-sonnet-alpha\",\n  \"session_id\": \"a1b2c3d4\",\n  \"sequence\": 42,\n  \"bead_id\": \"nd-a3f8\",\n  \"workspace\": \"/home/coder/project\",\n  \"data\": { }\n}\n```\n\n| Field | Type | Description |\n|-------|------|-------------|\n| `timestamp` | ISO 8601 with milliseconds | When the event occurred |\n| `event_type` | Dotted string | Event classification |\n| `worker_id` | String | Unique worker identifier |\n| `session_id` | String | Unique session identifier (random per boot) |\n| `sequence` | u64 | Monotonically increasing per session (enables ordering) |\n| `bead_id` | String? | Bead ID if applicable |\n| `workspace` | Path? | Workspace path if applicable |\n| `data` | Object | Event-specific payload |\n\n## Event Catalog\n\n### Worker Lifecycle\n\n| Event Type | Emitted When | Data Fields |\n|------------|-------------|-------------|\n| `worker.started` | Worker boots successfully | `agent`, `model`, `config_hash`, `version` |\n| `worker.stopped` | Graceful shutdown | `beads_processed`, `uptime_seconds`, `reason` |\n| `worker.errored` | Unrecoverable error | `error_type`, `error_message`, `beads_processed` |\n| `worker.exhausted` | All strands empty | `cycle_count`, `last_strand_evaluated` |\n| `worker.idle` | Entering backoff after exhaustion | `backoff_seconds` |\n\n### Strand Evaluation\n\n| Event Type | Emitted When | Data Fields |\n|------------|-------------|-------------|\n| `strand.evaluated` | Strand returns a result | `strand_name`, `result` (`bead_found`, `work_created`, `no_work`, `error`), `duration_ms` |\n| `strand.skipped` | Strand is disabled | `strand_name`, `reason` |\n\n### Bead Operations\n\n| Event Type | Emitted When | Data Fields |\n|------------|-------------|-------------|\n| `bead.claim.attempted` | Claim attempt starts | `bead_id`, `retry_number` |\n| `bead.claim.succeeded` | Claim won | `bead_id`, `priority`, `title_hash` |\n| `bead.claim.race_lost` | Claim lost to another worker | `bead_id`, `claimed_by` |\n| `bead.claim.failed` | Claim failed (not race) | `bead_id`, `reason` |\n| `bead.released` | Bead released back to queue | `bead_id`, `reason` (`failure`, `timeout`, `crash`, `interrupted`) |\n| `bead.completed` | Bead closed by agent (detected) | `bead_id`, `duration_ms` |\n| `bead.orphaned` | Agent exited 0 but bead still open | `bead_id` |\n\n### Agent Dispatch\n\n| Event Type | Emitted When | Data Fields |\n|------------|-------------|-------------|\n| `agent.dispatched` | Agent process started | `agent_name`, `model`, `pid`, `prompt_hash`, `prompt_tokens_est` |\n| `agent.executing` | Periodic during execution | `pid`, `elapsed_ms`, `still_alive` |\n| `agent.completed` | Agent process exited | `exit_code`, `elapsed_ms`, `stdout_bytes`, `stderr_bytes` |\n| `agent.timeout` | Agent killed for timeout | `timeout_ms`, `pid` |\n\n### Outcome Handling\n\n| Event Type | Emitted When | Data Fields |\n|------------|-------------|-------------|\n| `outcome.classified` | Exit code mapped to outcome | `outcome` (`success`, `failure`, `timeout`, `crash`, `agent_not_found`, `interrupted`), `exit_code` |\n| `outcome.handled` | Handler executed | `outcome`, `action` (`released`, `deferred`, `alerted`, `none`) |\n\n### Health\n\n| Event Type | Emitted When | Data Fields |\n|------------|-------------|-------------|\n| `heartbeat.emitted` | Heartbeat file updated | `state`, `current_bead` |\n| `peer.stale` | Stale peer detected | `peer_id`, `last_seen`, `claimed_bead` |\n| `peer.crashed` | Dead peer cleaned up | `peer_id`, `released_bead` |\n| `health.check` | Periodic health check | `db_healthy`, `disk_free_mb`, `peer_count` |\n| `fleet.cpu_saturated` | System load exceeds threshold | `load_average` (f64), `threshold` (f64), `core_count` (usize) |\n| `fleet.memory_low` | Free memory below threshold | `free_mb` (u64), `threshold_mb` (u64) |\n\n### Effort Tracking\n\n| Event Type | Emitted When | Data Fields |\n|------------|-------------|-------------|\n| `effort.recorded` | After each bead processing cycle | `bead_id`, `elapsed_ms`, `agent_name`, `model`, `tokens_in`, `tokens_out`, `estimated_cost_usd` |\n\n## Sinks\n\nTelemetry events are dispatched to one or more sinks. Sinks are configured independently.\n\n### File Sink (default, always on)\n\nWrites JSONL to per-worker log files:\n\n```\n~/.needle/logs/<worker-id>.jsonl\n```\n\n- One line per event\n- File is append-only\n- Rotation: new file per session (session ID in filename) or size-based (configurable)\n\n### Stdout Sink (optional)\n\nWrites human-readable summary to stdout for interactive monitoring:\n\n```\n15:30:00 [alpha] CLAIMED nd-a3f8 (p1: \"Fix auth middleware\")\n15:30:02 [alpha] DISPATCHED claude-sonnet pid=12345\n15:32:15 [alpha] SUCCESS nd-a3f8 (135s, ~2400 tokens)\n15:32:15 [alpha] CLAIMED nd-b2c9 (p2: \"Add rate limiting tests\")\n```\n\n- Enabled when worker runs in foreground or via `needle attach`\n- Format is configurable: `minimal`, `normal`, `verbose`\n- Color-coded by event type\n\n### Hook Sink (optional)\n\nDispatches events to external systems via webhook or command:\n\n```yaml\ntelemetry:\n  hooks:\n    - event_filter: \"outcome.*\"\n      command: \"curl -X POST https://webhook.example.com/needle -d @-\"\n    - event_filter: \"worker.errored\"\n      command: \"/path/to/alert-script.sh\"\n    - event_filter: \"effort.recorded\"\n      command: \"/path/to/cost-tracker.sh\"\n```\n\n- Events matching the filter are piped as JSON to the command's stdin\n- Hook execution is fire-and-forget (non-blocking)\n- Failed hooks emit a `telemetry.hook.failed` event to the file sink (not recursively to hooks)\n\n### OTLP Sink (optional)\n\nExports telemetry as OpenTelemetry signals (traces, metrics, logs) over OTLP to any compliant collector (OpenTelemetry Collector, Jaeger, Tempo, Grafana Alloy, Honeycomb, Datadog, etc.). This is the canonical integration point for FABRIC and any downstream observability plane.\n\n```yaml\ntelemetry:\n  otlp:\n    enabled: true\n    endpoint: \"http://otel-collector.tailnet:4317\"    # gRPC default; use 4318 for HTTP\n    protocol: grpc                                     # grpc | http/protobuf\n    headers:\n      authorization: \"Bearer ${OTEL_TOKEN}\"            # env interpolation\n    timeout_ms: 5000\n    compression: gzip                                  # none | gzip\n    tls:\n      insecure: false\n      ca_file: \"\"\n    signals:\n      traces: true\n      metrics: true\n      logs: true\n    resource_attributes:\n      deployment.environment: \"production\"\n      service.namespace: \"needle-fleet\"\n```\n\nDesign:\n\n- **Non-blocking.** Uses a batch span/log/metric processor. If the collector is unreachable, events are buffered up to a bounded queue, then dropped (same policy as file sink). Drops emit a `telemetry.otlp.dropped` event to the file sink (never recursively to OTLP).\n- **Additive.** The file sink is authoritative. OTLP is an export, not a replacement. If OTLP is disabled or misconfigured, NEEDLE behaves identically to a file-sink-only deployment.\n- **Stdlib deps.** Rust crates: `opentelemetry`, `opentelemetry_sdk`, `opentelemetry-otlp`, `opentelemetry-semantic-conventions`. All support OTLP/gRPC and OTLP/HTTP.\n- **W3C trace context.** Trace and span IDs are generated per the W3C Trace Context spec so they interop with any OTel backend.\n- **Graceful shutdown.** On `worker.stopped`, the exporter is flushed with a deadline before process exit. Failure to flush is logged but never blocks shutdown.\n\n## OpenTelemetry Semantic Mapping\n\nNEEDLE's existing event catalog maps cleanly to OpenTelemetry's three signal types. This mapping is **normative** — the OTLP sink implementation must conform to it so dashboards and alerts remain stable across NEEDLE versions.\n\n### Resource Attributes\n\nEvery exported signal carries these resource attributes (per OTel semantic conventions):\n\n| Attribute | Value | Source |\n|-----------|-------|--------|\n| `service.name` | `\"needle\"` | Constant |\n| `service.version` | build version | `env!(\"CARGO_PKG_VERSION\")` |\n| `service.instance.id` | `<worker_id>` | e.g., `needle-claude-anthropic-sonnet-alpha` |\n| `service.namespace` | `\"needle-fleet\"` (default, configurable) | Config |\n| `deployment.environment` | e.g., `\"production\"` | Config |\n| `host.name` | hostname | OS |\n| `process.pid` | worker PID | OS |\n| `needle.agent` | e.g., `\"claude-anthropic-sonnet\"` | Worker config |\n| `needle.model` | e.g., `\"claude-sonnet-4-6\"` | Worker config |\n| `needle.session_id` | session ID | Per-boot random |\n| `needle.workspace` | workspace path | Worker config |\n\n### Traces\n\nThe NEEDLE state machine is naturally hierarchical, which maps directly to OTel spans.\n\n```\nworker.session                                          (root span, lifetime = worker process)\n├── strand.pluck                                        (one per strand evaluation)\n│   └── bead.lifecycle                                  (one per claimed bead)\n│       ├── bead.claim                                  (ATOMIC phase)\n│       ├── bead.prompt_build\n│       ├── agent.dispatch                              (DISPATCHING + EXECUTING)\n│       │   └── agent.execution                         (process alive; span.ok on exit 0)\n│       └── bead.outcome                                (HANDLING)\n│           └── bead.mitosis?                           (optional, if outcome = failure)\n├── strand.mend\n├── strand.explore\n├── strand.weave\n├── strand.unravel\n├── strand.pulse\n└── strand.knot                                         (terminal backoff / exhaustion)\n```\n\nSpan naming follows OpenTelemetry conventions: lowercase dotted, verb-form where appropriate.\n\n**Span attributes** follow OTel semantic conventions where applicable, plus a `needle.*` namespace:\n\n| Span | Key Attributes |\n|------|----------------|\n| `worker.session` | `needle.beads_processed`, `needle.uptime_seconds`, `needle.exit_reason` |\n| `strand.*` | `needle.strand.name`, `needle.strand.result`, `needle.strand.duration_ms` |\n| `bead.lifecycle` | `needle.bead.id`, `needle.bead.priority`, `needle.bead.title_hash`, `needle.bead.outcome` |\n| `bead.claim` | `needle.claim.retry_number`, `needle.claim.result` (`succeeded` / `race_lost` / `failed`) |\n| `agent.dispatch` | `gen_ai.system` (e.g., `anthropic`), `gen_ai.request.model`, `gen_ai.usage.input_tokens`, `gen_ai.usage.output_tokens`, `needle.agent.pid`, `needle.agent.exit_code` |\n| `bead.outcome` | `needle.outcome` (`success` / `failure` / `timeout` / `crash` / `agent_not_found` / `interrupted`), `needle.outcome.action` |\n\n**GenAI semantic conventions.** The `agent.dispatch` span uses OTel's `gen_ai.*` conventions so NEEDLE's token/cost data shows up in GenAI dashboards out-of-the-box (Grafana GenAI app, Langfuse, Honeycomb AI, etc.).\n\n**Span status.** Success outcomes set `Status::Ok`. All other outcomes set `Status::Error` with a description matching the `needle.outcome` value. This makes error-rate SLOs trivial.\n\n**Context propagation.** The trace ID from `worker.session` is recorded in the file-sink event envelope as a new optional field `trace_id`, enabling correlation between the JSONL file sink and the OTel backend without ambiguity.\n\n### Metrics\n\nMetrics are emitted via the OTel Meter API, one `Meter` per worker. All metrics are prefixed `needle.*`.\n\n| Metric | Instrument | Unit | Attributes | Description |\n|--------|-----------|------|------------|-------------|\n| `needle.workers.active` | UpDownCounter | `{worker}` | — | Current live worker count (incremented on `worker.started`, decremented on `worker.stopped`) |\n| `needle.beads.claimed` | Counter | `{bead}` | `strand`, `priority` | Successful bead claims |\n| `needle.beads.completed` | Counter | `{bead}` | `outcome` | Bead terminal outcomes (one per `bead.outcome`) |\n| `needle.beads.duration` | Histogram | `ms` | `outcome` | End-to-end bead lifecycle time |\n| `needle.claim.attempts` | Counter | `{attempt}` | `result` (`succeeded`/`race_lost`/`failed`) | Claim attempts |\n| `needle.strand.duration` | Histogram | `ms` | `strand`, `result` | Strand evaluation time |\n| `needle.agent.duration` | Histogram | `ms` | `agent`, `model`, `exit_code` | Agent process runtime |\n| `needle.agent.tokens.input` | Counter | `{token}` | `agent`, `model` | Input tokens consumed |\n| `needle.agent.tokens.output` | Counter | `{token}` | `agent`, `model` | Output tokens produced |\n| `needle.cost.usd` | Counter | `USD` | `agent`, `model` | Estimated cost accumulator |\n| `needle.heartbeat.age` | Gauge (observable) | `s` | `worker_id` | Seconds since last heartbeat emitted by this worker |\n| `needle.peers.stale` | UpDownCounter | `{peer}` | — | Currently-stale peers observed by this worker |\n| `needle.queue.depth` | Gauge (observable) | `{bead}` | `workspace`, `priority` | Open beads visible to this worker (sampled at strand evaluation) |\n| `needle.mitosis.children_created` | Counter | `{bead}` | `parent_id` | Mitosis child creations |\n| `needle.outcome.rate` | derived | — | — | Computed in the backend as `needle.beads.completed{outcome=\"success\"} / needle.beads.completed` |\n\nMetric aggregation temporality is **delta** (standard OTel default); backends that require cumulative (Prometheus via prometheusreceiver) convert upstream.\n\n### Logs\n\nEvery NEEDLE telemetry event that isn't already represented as a span event is exported as an OTel LogRecord with:\n\n- `severity_number` / `severity_text`: `INFO` for normal events, `WARN` for `peer.stale` / `telemetry.*.dropped`, `ERROR` for `worker.errored` / `bead.claim.failed` / `agent.timeout`.\n- `body`: the existing event `data` object.\n- `attributes`: flattened from the event envelope (`event_type`, `bead_id`, `workspace`, etc.).\n- `trace_id` / `span_id`: linked to the enclosing `bead.lifecycle` or `worker.session` span where applicable.\n\nEvents that ARE spans (e.g., `bead.claim.attempted` → a span, not a log) do not double-export as logs.\n\n### Span Events vs. Logs\n\nIntra-span state changes (e.g., `agent.executing` heartbeats, `heartbeat.emitted`) are recorded as OTel **span events** on the nearest enclosing span, not as separate logs. This keeps the signal count manageable and makes timelines in Tempo/Jaeger readable.\n\n## Token and Cost Tracking\n\n### Token Extraction\n\nNEEDLE attempts to extract token usage from agent output. This is agent-specific and best-effort:\n\n| Agent | Extraction Method |\n|-------|-------------------|\n| Claude Code | Parse `--output-format json` for `usage.input_tokens`, `usage.output_tokens` |\n| OpenCode | Parse structured output (TBD) |\n| Codex CLI | Parse structured output (TBD) |\n| Aider | Parse cost summary line from stderr |\n| Generic | No extraction; record elapsed time only |\n\nIf token extraction fails, the event is still emitted with `null` token fields. Missing tokens are not an error.\n\n### Cost Estimation\n\nCost is estimated from tokens using configurable per-model pricing:\n\n```yaml\npricing:\n  claude-sonnet:\n    input_per_million: 3.00\n    output_per_million: 15.00\n  claude-opus:\n    input_per_million: 15.00\n    output_per_million: 75.00\n  gpt-4:\n    input_per_million: 30.00\n    output_per_million: 60.00\n```\n\nCost is **estimated**, never authoritative. It is recorded in telemetry for trend analysis, not for billing.\n\n## Querying Telemetry\n\nNEEDLE includes built-in telemetry queries via the CLI:\n\n```bash\n# Summary of today's work\nneedle status\n\n# Per-worker breakdown\nneedle status --by-worker\n\n# Cost summary\nneedle status --cost --since 2026-03-20\n\n# Event stream (tail -f equivalent)\nneedle logs --follow\n\n# Filter by event type\nneedle logs --filter \"bead.claim.*\" --since 1h\n\n# Export for external analysis\nneedle logs --format jsonl --since 24h > export.jsonl\n```\n\n---\n\n# Self-Healing\n\nNEEDLE workers must detect and recover from failures without human intervention. This section specifies the failure modes, detection mechanisms, and recovery procedures.\n\n## Failure Taxonomy\n\n| Failure | Scope | Detection | Recovery |\n|---------|-------|-----------|----------|\n| Worker crash | Worker | Heartbeat TTL expiry | Peer cleanup via Mend |\n| Worker stuck | Worker | Heartbeat stale + PID alive | Alert via Knot |\n| Agent hang | Bead | Execution timeout | Kill process, release bead |\n| Stale claim | Bead | in_progress + no heartbeat | Mend releases bead |\n| Orphaned lock | Workspace | Lock file age > TTL | Mend removes lock |\n| Database corruption | Workspace | `br doctor` detects | Auto-repair from JSONL |\n| Stale dependency | Bead | Closed bead still blocks open bead | Mend cleans dependency |\n| Disk full | System | Write failure | Emit alert, graceful stop |\n| Bead store unreachable | System | `br` command fails | Retry with backoff, then stop |\n\n## Heartbeat-Based Detection\n\n```\nWorker A (alive)          Worker B (alive)         Worker C (crashed)\n┌──────────────┐         ┌──────────────┐         ┌──────────────┐\n│ heartbeat:   │         │ heartbeat:   │         │ heartbeat:   │\n│ 15:30:00     │         │ 15:30:10     │         │ 15:20:00     │ ← stale\n│ state: EXEC  │         │ state: SEL   │         │ state: EXEC  │\n│ bead: nd-a3f │         │ bead: null   │         │ bead: nd-x7y │ ← orphaned claim\n└──────────────┘         └──────────────┘         └──────────────┘\n\nWorker B runs Mend strand:\n  1. Reads all heartbeat files\n  2. Detects C's heartbeat is stale (10 min old, TTL is 5 min)\n  3. Checks PID: dead\n  4. Releases nd-x7y: br update nd-x7y --status open --unassign\n  5. Removes C's heartbeat file\n  6. Deregisters C from worker registry\n  7. Emits peer.crashed telemetry\n```\n\n### Detection Parameters\n\n| Parameter | Default | Description |\n|-----------|---------|-------------|\n| `heartbeat_interval` | 30s | How often a worker writes its heartbeat |\n| `heartbeat_ttl` | 5min | How long before a heartbeat is considered stale |\n| `peer_check_interval` | 60s | How often Mend checks peer heartbeats |\n\n**Relationship:** `heartbeat_ttl` should be at least `3 × heartbeat_interval` to tolerate transient delays.\n\n### Stuck vs. Crashed\n\n| Signal | Diagnosis | Action |\n|--------|-----------|--------|\n| Stale heartbeat + PID dead | **Crashed.** Worker terminated unexpectedly. | Release claim, clean up, emit `peer.crashed` |\n| Stale heartbeat + PID alive | **Stuck.** Worker is hung (deadlock, infinite loop, blocked I/O). | Emit `peer.stale` warning. Do NOT kill — may be legitimately slow. Alert via Knot after threshold. |\n| Fresh heartbeat + PID alive | **Healthy.** Normal operation. | No action. |\n\n**NEEDLE does not auto-kill stuck workers.** A stuck worker with a live PID may be executing a legitimately slow agent. Killing it would interrupt work. Instead, NEEDLE alerts via Knot and lets the human decide.\n\n## Database Recovery\n\nbeads_rust uses SQLite with a known corruption issue (FrankenSQLite, upstream #171). NEEDLE must handle this.\n\n### Recovery Procedure\n\n```\nCorruption detected\n       │\n       ▼\n  Run br doctor --repair\n       │\n       ├── Success ──► Resume operation, emit health.db_repaired\n       │\n       └── Failure ──► Full rebuild:\n                          1. rm .beads/beads.db\n                          2. br sync --import\n                          3. Verify: br doctor\n                          │\n                          ├── Success ──► Resume, emit health.db_rebuilt\n                          │\n                          └── Failure ──► ERRORED state (JSONL itself may be corrupt)\n```\n\n**Key insight from `docs/notes/mitosis-explosion-postmortem.md`:** The JSONL file is always the authoritative data source. It is append-only and immune to SQLite corruption. Recovery always rebuilds from JSONL.\n\n### Proactive Health Checks\n\nThe Mend strand runs `br doctor` (without `--repair`) periodically:\n- After every N beads processed (configurable, default: 50)\n- On every Mend strand evaluation\n- If doctor reports warnings, escalate to `--repair` immediately rather than waiting for failure\n\n## Stale Claim Recovery\n\n```\nMend strand evaluates:\n  1. Query beads with status=in_progress\n  2. For each:\n     a. Read assigned worker ID from bead\n     b. Check worker's heartbeat file\n     c. If heartbeat is stale AND PID is dead:\n        - br update <bead_id> --status open --unassign\n        - Emit bead.released telemetry (reason: stale_claim)\n     d. If heartbeat is stale AND PID is alive:","numLines":2033,"startLine":1,"totalLines":3828,"truncatedByTokenCap":true}}}
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Looking at the plan.md, I can see:\n- Strand 1: Pluck\n- Strand 2: Mend\n- Strand 3: Explore\n- Strand 4: Weave\n- Strand 5: Unravel\n- Strand 6: Pulse\n- Strand 7: Reflect\n- Strand 8: Splice (lines 1130-1174)\n- Strand 9: Knot (lines 1175-1203)\n\nSo the plan.md already documents Splice as Strand 8, and the commit_hook is documented in the Architecture chapter. Let me verify by reading the relevant sections more carefully.\n\nLooking at the Strand 8: Splice section in plan.md (lines 1130-1174), it documents:\n- Purpose\n- Invokes agent: No\n- Entry condition\n- Algorithm (dead workers and live-but-looping workers)\n- Exit conditions\n- State persistence\n- Loop detection thresholds\n\nAnd the commit_hook section (lines 745-783) documents:\n- Functionality\n- Trailer format\n- Integration context\n- Timeouts\n- Design notes\n\nLet me also check the module boundary table to see if both modules are included. Looking at lines 438-488, I can see:\n- `strand/` - with `splice/` as a subdirectory\n\n\n- `commit_hook/` is listed as a separate module\n\nI notice the commit_hook module has a different directory structure than expected. The source file is actually at `src/commit_hook.rs`, not in a subdirectory. This discrepancy needs to be corrected in the plan.md documentation.\n\nI'll investigate the splice module's implementation and compare it with the plan.md documentation to ensure accuracy.\n\nThe Splice strand section looks comprehensive, covering:\n- Module purpose and worker failure documentation\n- Entry conditions tied to configuration and heartbeat files\n- Algorithmic details for detecting failures and loop patterns\n- Exit conditions and return values\n- State persistence and configuration thresholds\n\nI'll verify the commit_hook documentation against the source implementation, focusing on the git HEAD commit trailer injection mechanism and its 30-second timeout configuration.\n\nThe module boundary table requires updates to accurately reflect the actual source code structure, particularly the flat module layout.\n\nI'll carefully cross-reference the plan.md sections with source code details, ensuring precise alignment between documentation and implementation. The current documentation appears mostly correct, but the structural representation needs refinement.\n\nThe key is maintaining clarity while accurately representing the actual project architecture. Minor adjustments to the module boundary table will resolve the current inconsistencies.\n\nSpecifically, I'll confirm the splice documentation's completeness and verify commit_hook's accurate representation. The goal is precise, aligned documentation that matches the source code's actual structure.\n\nThe next step involves a detailed review of the Strand Waterfall section to ensure all implementation details are correctly captured and no critical information has been overlooked. I'm investigating the documentation status, focusing on a potential issue with commit trailer documentation. The commit_hook section covers trailer injection functionality, but I need to verify if HOOP bead_commit_index integration is fully described. The source code confirms the integration point, but I'll cross-reference with the plan documentation to ensure comprehensive coverage.\n\nThe module boundary table requires careful verification, especially regarding directory structure and module organization. I'll systematically check each component to confirm accurate representation.\n\nThe dependency graph seems to need a thorough review, particularly the connections between commit_hook and other modules. I'll trace the actual relationships to ensure precise documentation.\n\nThe splice strand documentation looks comprehensive, covering key aspects like worker failure detection, loop identification, and threshold configurations. I'll confirm the details match the implementation requirements.\n\nThe commit_hook documentation is precise, outlining trailer injection mechanisms, timing constraints, and error handling strategies. I'll validate the technical specifications against the implementation.\n\nThe module structure shows clear separation between core functionality strands, with specific focuses like worker failure documentation and bead ID management. The connections between modules like `splice` and `bead_store` demonstrate clean architectural design.\n\nI notice a potential redundancy in the commit_hook description that might need streamlining. The dependency graph reveals an interesting interaction where `commit_hook` connects to both `types` and is referenced by `worker`, suggesting a modular and interconnected system.\n\nThe module boundary table confirms the architectural intent, showing each component's specific responsibility. The `commit_hook` module's role in git commit trailer injection is clearly defined.\n\nThe dependency graph is more complex than the table suggests, with multiple interconnected modules beyond the simple worker-to-commit_hook connection.\n\nI've systematically verified the plan documentation, finding comprehensive coverage of Splice, commit trailer injection, and module relationships. The existing documentation appears robust, with no significant gaps identified in the current implementation.\n\nThe module structure reveals intricate dependencies, particularly with telemetry, health, and bead_store modules playing central roles in the system's architecture.\n\nI've confirmed the commit_hook module's precise location and verified the dependency graph's accuracy. The next step involves examining the remaining sections of the plan.md document to ensure complete coverage.","signature":""}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0},"context_management":null},"parent_tool_use_id":null,"session_id":"72539a33-4a3d-4268-95e8-c3da33ecc3f7","uuid":"68678537-5922-4caf-8b43-cef7ee3065c1"}
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{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_efd34b4e281742928d96b2c3","type":"tool_result","content":"430\t5. **The exclusion set is bounded.** It is cleared on every transition to SELECTING. It cannot grow unboundedly within a selection cycle because max_retries is finite.\n431\t\n432\t6. **Shutdown is always graceful when possible.** SIGTERM triggers STOPPED, not ERRORED. Only SIGKILL causes ungraceful termination, and heartbeat TTL handles that case.\n433\t\n434\t---\n435\t\n436\t# Architecture\n437\t\n438\t## Module Boundaries\n439\t\n440\tNEEDLE is organized into crates (Rust) or packages (Go) with strict dependency rules. No circular dependencies. Each module has a single responsibility.\n441\t\n442\t```\n443\tneedle (binary)\n444\t├── cli/              CLI parsing, session management\n445\t├── worker/           Worker loop, state machine\n446\t├── strand/           Strand waterfall evaluation\n447\t│   └── splice/       Worker failure documentation\n448\t├── claim/            Atomic claiming, lock management\n449\t├── prompt/           Prompt construction from bead context\n450\t├── dispatch/         Agent adapter loading, process execution\n451\t├── outcome/          Exit code classification, outcome handlers\n452\t├── commit_hook/      Bead-Id trailer injection for git commits\n453\t├── telemetry/        Structured event emission, sinks\n454\t├── health/           Heartbeat, stuck detection, peer monitoring\n455\t├── config/           Hierarchical configuration loading\n456\t├── bead_store/       Abstract bead backend interface\n457\t└── types/            Shared types, error definitions\n458\t```\n459\t\n460\t### Dependency Graph\n461\t\n462\t```\n463\tcli ──► worker ──► strand ──► bead_store\n464\t                │           │\n465\t                │           └──► splice ──► bead_store\n466\t                │                               ├──► telemetry\n467\t                │                               └──► health\n468\t                │\n469\t                ├──► claim ─┘\n470\t                │\n471\t                ├──► prompt ──► bead_store\n472\t                │\n473\t                ├──► dispatch\n474\t                │\n475\t                ├──► outcome ──► bead_store\n476\t                │               ├──► telemetry\n477\t                │               └──► health\n478\t                │\n479\t                ├──► commit_hook ──► types\n480\t                │\n481\t                ├──► telemetry\n482\t                │\n483\t                └──► health ──► telemetry\n484\t\n485\tconfig ◄── (all modules)\n486\ttypes  ◄── (all modules)\n487\t```\n488\t\n489\t**Rule:** Arrows point from dependent to dependency. No module depends on `cli` or `worker` except through the binary entry point. `telemetry`, `config`, and `types` are leaf dependencies available to all modules.\n490\t\n491\t## Data Flow\n492\t\n493\t### Primary Loop\n494\t\n495\t```\n496\tbead_store ──[candidates]──► strand ──[bead_id]──► claim ──[claimed_bead]──►\n497\tprompt ──[prompt_string]──► dispatch ──[process]──► worker(wait) ──►\n498\toutcome ──[result]──► bead_store + telemetry\n499\t```\n500\t\n501\t### Telemetry Flow\n502\t\n503\t```\n504\t                    ┌─────────────────────────┐\n505\t                    │    Telemetry Collector   │\n506\t                    └────────────┬────────────┘\n507\t                                 │\n508\t              ┌──────────────────┼──────────────────┐\n509\t              ▼                  ▼                   ▼\n510\t        ┌──────────┐     ┌────────────┐      ┌──────────┐\n511\t        │ File Sink│     │ Stdout Sink│      │ Hook Sink│\n512\t        │ (JSONL)  │     │ (human)    │      │ (webhook)│\n513\t        └──────────┘     └────────────┘      └──────────┘\n514\t```\n515\t\n516\t### Configuration Flow\n517\t\n518\t```\n519\t  CLI args ──► env vars ──► workspace .needle.yaml ──► global ~/.needle/config.yaml ──► defaults\n520\t  (highest)                                                                              (lowest)\n521\t```\n522\t\n523\t## Module Specifications\n524\t\n525\t### bead_store\n526\t\n527\tAbstract interface to any bead backend. The primary implementation wraps the `br` CLI, but the trait allows future backends (direct SQLite, HTTP API, etc.).\n528\t\n529\t```"}]},"parent_tool_use_id":null,"session_id":"72539a33-4a3d-4268-95e8-c3da33ecc3f7","uuid":"ab4a3f43-6e69-442e-be93-8f5e8f6c8b39","timestamp":"2026-05-30T15:28:17.738Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/NEEDLE/docs/plan/plan.md","content":"5. **The exclusion set is bounded.** It is cleared on every transition to SELECTING. It cannot grow unboundedly within a selection cycle because max_retries is finite.\n\n6. **Shutdown is always graceful when possible.** SIGTERM triggers STOPPED, not ERRORED. Only SIGKILL causes ungraceful termination, and heartbeat TTL handles that case.\n\n---\n\n# Architecture\n\n## Module Boundaries\n\nNEEDLE is organized into crates (Rust) or packages (Go) with strict dependency rules. No circular dependencies. Each module has a single responsibility.\n\n```\nneedle (binary)\n├── cli/              CLI parsing, session management\n├── worker/           Worker loop, state machine\n├── strand/           Strand waterfall evaluation\n│   └── splice/       Worker failure documentation\n├── claim/            Atomic claiming, lock management\n├── prompt/           Prompt construction from bead context\n├── dispatch/         Agent adapter loading, process execution\n├── outcome/          Exit code classification, outcome handlers\n├── commit_hook/      Bead-Id trailer injection for git commits\n├── telemetry/        Structured event emission, sinks\n├── health/           Heartbeat, stuck detection, peer monitoring\n├── config/           Hierarchical configuration loading\n├── bead_store/       Abstract bead backend interface\n└── types/            Shared types, error definitions\n```\n\n### Dependency Graph\n\n```\ncli ──► worker ──► strand ──► bead_store\n                │           │\n                │           └──► splice ──► bead_store\n                │                               ├──► telemetry\n                │                               └──► health\n                │\n                ├──► claim ─┘\n                │\n                ├──► prompt ──► bead_store\n                │\n                ├──► dispatch\n                │\n                ├──► outcome ──► bead_store\n                │               ├──► telemetry\n                │               └──► health\n                │\n                ├──► commit_hook ──► types\n                │\n                ├──► telemetry\n                │\n                └──► health ──► telemetry\n\nconfig ◄── (all modules)\ntypes  ◄── (all modules)\n```\n\n**Rule:** Arrows point from dependent to dependency. No module depends on `cli` or `worker` except through the binary entry point. `telemetry`, `config`, and `types` are leaf dependencies available to all modules.\n\n## Data Flow\n\n### Primary Loop\n\n```\nbead_store ──[candidates]──► strand ──[bead_id]──► claim ──[claimed_bead]──►\nprompt ──[prompt_string]──► dispatch ──[process]──► worker(wait) ──►\noutcome ──[result]──► bead_store + telemetry\n```\n\n### Telemetry Flow\n\n```\n                    ┌─────────────────────────┐\n                    │    Telemetry Collector   │\n                    └────────────┬────────────┘\n                                 │\n              ┌──────────────────┼──────────────────┐\n              ▼                  ▼                   ▼\n        ┌──────────┐     ┌────────────┐      ┌──────────┐\n        │ File Sink│     │ Stdout Sink│      │ Hook Sink│\n        │ (JSONL)  │     │ (human)    │      │ (webhook)│\n        └──────────┘     └────────────┘      └──────────┘\n```\n\n### Configuration Flow\n\n```\n  CLI args ──► env vars ──► workspace .needle.yaml ──► global ~/.needle/config.yaml ──► defaults\n  (highest)                                                                              (lowest)\n```\n\n## Module Specifications\n\n### bead_store\n\nAbstract interface to any bead backend. 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{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_febb8174196647a7815dd190","type":"tool_result","content":"The file /home/coding/NEEDLE/docs/plan/plan.md has been updated successfully. (file state is current in your context — no need to Read it back)"}]},"parent_tool_use_id":null,"session_id":"72539a33-4a3d-4268-95e8-c3da33ecc3f7","uuid":"6ba681fb-2df2-43d2-9efa-efa0de6ab288","timestamp":"2026-05-30T15:28:34.600Z","tool_use_result":{"filePath":"/home/coding/NEEDLE/docs/plan/plan.md","oldString":"```\nneedle (binary)\n├── cli/              CLI parsing, session management\n├── worker/           Worker loop, state machine\n├── strand/           Strand waterfall evaluation\n│   └── splice/       Worker failure documentation\n├── claim/            Atomic claiming, lock management\n├── prompt/           Prompt construction from bead context\n├── dispatch/         Agent adapter loading, process execution\n├── outcome/          Exit code classification, outcome handlers\n├── commit_hook/      Bead-Id trailer injection for git commits\n├── telemetry/        Structured event emission, sinks\n├── health/           Heartbeat, stuck detection, peer monitoring\n├── config/           Hierarchical configuration loading\n├── bead_store/       Abstract bead backend interface\n└── types/            Shared types, error definitions\n```","newString":"```\nneedle (binary)\n├── cli/              CLI parsing, session management\n├── worker/           Worker loop, state machine\n├── strand/           Strand waterfall evaluation\n│   └── splice.rs     Worker failure documentation\n├── claim/            Atomic claiming, lock management\n├── prompt/           Prompt construction from bead context\n├── dispatch/         Agent adapter loading, process execution\n├── outcome/          Exit code classification, outcome handlers\n├── commit_hook.rs    Bead-Id trailer injection for git commits\n├── telemetry/        Structured event emission, sinks\n├── health/           Heartbeat, stuck detection, peer monitoring\n├── config/           Hierarchical configuration loading\n├── bead_store/       Abstract bead backend interface\n└── types/            Shared types, error definitions\n```","originalFile":"# NEEDLE Implementation Plan\n\n> **N**avigates **E**very **E**nqueued **D**eliverable, **L**ogs **E**ffort\n\n## Design Principles\n\nThese six principles are non-negotiable. Every design decision in this plan traces back to one or more of them.\n\n1. **Deterministic order.** Given the same queue state, every worker computes the same bead ordering. There is no randomness in selection. Ties are broken by creation time.\n\n2. **Explicit outcome paths.** Every possible result of every operation has a named handler. If an outcome can happen, it has a handler. If it doesn't have a handler, it cannot happen. The type system enforces exhaustiveness.\n\n3. **Platform and model agnostic.** NEEDLE wraps any headless CLI that accepts a prompt and exits. It runs on any POSIX system. It does not depend on any specific AI provider, model, or API.\n\n4. **Observable by default.** Every state transition, claim attempt, dispatch, and outcome emits structured telemetry. A silent worker is a broken worker. Telemetry is structured from origin (JSONL) and exportable as OpenTelemetry (OTLP) so any compliant backend — Tempo, Jaeger, Grafana, Honeycomb, Datadog, FABRIC — can consume NEEDLE's signals without a custom adapter.\n\n5. **Self-healing.** Workers detect and recover from stuck states, stale claims, crashed peers, and corrupted databases without human intervention. Recovery paths are explicit, not heuristic.\n\n6. **Separation of concerns.** The orchestrator does not execute work. The agent does not manage state. The bead store does not enforce workflow. Each component has one job.\n\n---\n\n## Architecture Overview\n\nNEEDLE is composed of five layers:\n\n```\n┌──────────────────────────────────────────────────────────────┐\n│                        CLI Layer                              │\n│  needle run | stop | list | attach | status | config          │\n├──────────────────────────────────────────────────────────────┤\n│                     Worker Layer                              │\n│  Worker loop, strand waterfall, session management            │\n├──────────────────────────────────────────────────────────────┤\n│                  Coordination Layer                            │\n│  Claiming, locking, heartbeats, peer awareness                │\n├──────────────────────────────────────────────────────────────┤\n│                    Agent Layer                                 │\n│  Adapter interface, dispatch, result capture                  │\n├──────────────────────────────────────────────────────────────┤\n│                   Foundation Layer                             │\n│  Telemetry, configuration, bead store interface, self-healing │\n└──────────────────────────────────────────────────────────────┘\n```\n\n### Component Map\n\n| Component | Responsibility | Inputs | Outputs |\n|-----------|---------------|--------|---------|\n| **CLI** | Parse commands, manage sessions | User commands | Worker processes |\n| **Worker** | Execute the strand waterfall loop | Bead queue state | Dispatch requests, state transitions |\n| **StrandRunner** | Evaluate strands in sequence | Queue state, config | Next bead or escalation |\n| **Claimer** | Atomic bead claiming with serialization | Candidate bead ID | Claimed bead or race-lost signal |\n| **PromptBuilder** | Construct deterministic prompts from bead context | Claimed bead | Prompt string |\n| **Dispatcher** | Load adapter, render template, execute agent | Prompt, adapter config | Agent process handle |\n| **OutcomeHandler** | Route exit code to explicit handler | Exit code, stdout/stderr | State transition |\n| **Telemetry** | Structured event emission | Any component event | JSONL records |\n| **HealthMonitor** | Heartbeat, stuck detection, peer awareness | Worker state | Recovery actions |\n| **ConfigLoader** | Hierarchical config resolution | Files, env, CLI args | Resolved config |\n| **BeadStore** | Abstract interface to bead backend | CRUD operations | Bead records |\n| **Mitosis** | Split multi-task beads into children with dedup | Failed bead, parent's existing children | Child beads or no-op |\n\n---\n\n## Language Decision\n\nThe implementation language must provide:\n\n| Requirement | Why | Source |\n|-------------|-----|--------|\n| Exhaustive pattern matching | Every outcome must be handled; compiler enforces it | Principle 2, bead-lifecycle-bugs.md |\n| Real module system | 45K single-file bash was unmaintainable | bash-at-scale-problems.md |\n| Structured error types | Silent failures caused cascading bugs | claim-race-conditions.md |\n| Native JSON support | Fragile jq parsing corrupted state | worker-starvation-lessons.md |\n| Proper concurrency primitives | flock/trap/PID files were inadequate | concurrency-approaches-compared.md |\n| Single binary distribution | NEEDLE must be trivially installable | Principle 3 |\n| Cross-platform | Linux, macOS at minimum | Principle 3 |\n| Static analysis | Catch undefined functions, unused variables at compile time | bundler-build-integrity.md |\n\n**Recommended: Rust.** Exhaustive `match`, `Result<T, E>` error handling, `serde_json`, `tokio` for async, single binary via static linking, cross-compilation. The beads ecosystem already has Rust precedent (beads_rust, beads-polis).\n\n**Acceptable alternative: Go.** Simpler learning curve, good concurrency, single binary. Lacks exhaustive matching (requires discipline instead of compiler enforcement).\n\n**Not acceptable: Bash, Python, Node.** Bash failed at scale (documented). Python/Node require runtime dependencies, violating single-binary distribution.\n\n---\n\n## Key Decisions from Research\n\nThese decisions are informed by the 14 research files in `docs/research/`:\n\n| Decision | Chosen Approach | Alternative Considered | Why |\n|----------|----------------|----------------------|-----|\n| Bead store interface | Abstract trait over `br` CLI | Direct SQLite access | Platform agnostic; works with future bead backends |\n| Claim atomicity | `br update --claim` + workspace flock | Central coordinator (Perles) | No SPOF; works with decentralized workers |\n| Heartbeat model | File-based heartbeat with TTL (from beads-polis) | Shared memory | Survives worker crashes; observable by peers |\n| Validation gates | Pluggable gate system (inspired by bg-gate) | Hardcoded checks | Different workspaces need different validation |\n| Work decomposition | Built-in mitosis with child-aware dedup | External only (spec2beads) | Mitosis is valid when the split criteria are semantic (multi-task detection) and dedup checks the parent's existing children |\n| Self-modification | Allowed with release channel promotion (testing → stable → fleet hot-reload) | Prohibited entirely | v1 failures came from untested changes deploying directly to the fleet. Canary testing with defined inputs/outputs prevents this. |\n| Workspace discovery | Explicit configuration | Filesystem scanning | Explore strand's unbounded find caused 35+ load |\n| Alert system | Verify-then-alert with rate limiting | Alert-on-empty | 100% false positive rate from naive alerting |\n\n## Key Decisions from Operational Learnings\n\nThese decisions are informed by the 9 notes files in `docs/notes/`:\n\n| Learning | Design Response |\n|----------|----------------|\n| Mitosis explosion (5,741 duplicate beads) | Mitosis checks parent's existing children before creating new ones. Duplicate splits are structurally impossible. Split criteria are semantic (multi-task detection), not numeric. |\n| 100% false positive starvation alerts | Three-state model: no beads exist / all claimed / invisible. Verify independently before alerting. |\n| Bundler shipped undefined functions | Compiled language eliminates this class entirely. |\n| Agent-owned closure most reliable | NEEDLE does not close beads. Agent receives `br close <id>` instruction in prompt. |\n| stdout/stderr corruption | Telemetry is a structured system, never interleaved with agent output. |\n| Workers modifying their own orchestrator | Self-modification allowed via release channels. New builds must pass canary tests in isolation before promotion to `:stable`. Fleet hot-reloads from `:stable`, never from `:testing`. |\n| ~20 worker practical limit (EX44) | Fleet sizing is bounded by three runtime factors: provider inference throughput, available CPU, and available RAM. NEEDLE monitors these and warns when saturated. Staggered launch is default. |\n| Bead granularity affects success rate | Document guidelines but don't enforce — this is a bead authoring concern, not orchestration. |\n\n---\n\n# State Machine\n\nThe worker loop is a finite state machine. Every state has defined entry conditions, actions, and exit transitions. There are no implicit states or fallthrough paths.\n\n## Worker States\n\n```\n                    ┌──────────┐\n                    │  BOOTING │\n                    └────┬─────┘\n                         │ config loaded, health check passed\n                         ▼\n                    ┌──────────┐\n              ┌────►│ SELECTING│◄──────────────────────────────┐\n              │     └────┬─────┘                                │\n              │          │ candidate found                      │\n              │          ▼                                      │\n              │     ┌──────────┐  race lost (retry < max)      │\n              │     │ CLAIMING │──────────────────────────┐    │\n              │     └────┬─────┘                           │    │\n              │          │ claimed                         │    │\n              │          ▼                                 ▼    │\n              │     ┌──────────┐                     ┌────────┐│\n              │     │ BUILDING │                     │RETRYING││\n              │     └────┬─────┘                     └────┬───┘│\n              │          │ prompt ready                   │     │\n              │          ▼                                └─────┘\n              │     ┌────────────┐\n              │     │DISPATCHING │\n              │     └────┬───────┘\n              │          │ agent process started\n              │          ▼\n              │     ┌──────────┐\n              │     │ EXECUTING│\n              │     └────┬─────┘\n              │          │ agent exited\n              │          ▼\n              │     ┌──────────┐\n              │     │ HANDLING │\n              │     └────┬─────┘\n              │          │ outcome processed\n              │          ▼\n              │     ┌──────────┐\n              │     │ LOGGING  │\n              │     └────┬─────┘\n              │          │ telemetry emitted\n              └──────────┘\n```\n\n### Terminal States\n\n```\n    ┌───────────┐       ┌───────────┐       ┌───────────┐\n    │ EXHAUSTED │       │  STOPPED  │       │  ERRORED  │\n    └───────────┘       └───────────┘       └───────────┘\n    all strands empty   graceful shutdown   unrecoverable\n```\n\n## State Definitions\n\n### BOOTING\n\n**Entry:** Worker process started.\n\n**Actions:**\n1. Load configuration (global → workspace → CLI overrides)\n2. Validate bead store connectivity (`br doctor` or equivalent)\n3. Register in worker state registry\n4. Emit `worker.started` telemetry event\n5. Start heartbeat emitter\n\n**Transitions:**\n| Condition | Next State |\n|-----------|-----------|\n| Config loaded, bead store healthy | SELECTING |\n| Config invalid | ERRORED |\n| Bead store unreachable | ERRORED (after retry with backoff) |\n\n### SELECTING\n\n**Entry:** Worker is ready for next bead. This is the strand waterfall entry point.\n\n**Actions:**\n1. Emit heartbeat\n2. Evaluate strands in sequence\n3. First strand that yields a candidate bead wins\n\n**Transitions:**\n| Condition | Next State |\n|-----------|-----------|\n| Candidate bead found | CLAIMING |\n| All strands exhausted | EXHAUSTED |\n| Shutdown signal received | STOPPED |\n\n### CLAIMING\n\n**Entry:** A candidate bead has been selected.\n\n**Actions:**\n1. Acquire workspace claim lock (flock, per-workspace)\n2. Verify bead is still claimable (`br show --json`, check status + assignee)\n3. Attempt atomic claim: `br update <id> --claim --actor <worker-id>`\n4. Release workspace claim lock\n5. Emit `bead.claim.attempted` telemetry\n\n**Transitions:**\n| Condition | Exit Code | Next State |\n|-----------|-----------|-----------|\n| Claim succeeded | 0 | BUILDING |\n| Race lost (already claimed) | 4 | RETRYING |\n| Bead no longer claimable (closed, deferred) | 1 | SELECTING |\n| Bead store error | >0 | SELECTING (after backoff) |\n| Max retries exceeded | — | SELECTING (exclude this bead, reset retry counter) |\n\n### RETRYING\n\n**Entry:** A claim attempt failed due to race condition.\n\n**Actions:**\n1. Increment retry counter for this selection cycle\n2. Add failed bead ID to exclusion set\n3. Emit `bead.claim.race_lost` telemetry\n\n**Transitions:**\n| Condition | Next State |\n|-----------|-----------|\n| Retry count < max_retries (default: 5) | CLAIMING (with next candidate from same strand) |\n| Retry count >= max_retries | SELECTING (reset, move to next strand) |\n\n### BUILDING\n\n**Entry:** Bead is claimed by this worker.\n\n**Actions:**\n1. Read full bead context: title, body, dependencies, labels, workspace path\n2. Read workspace context: CLAUDE.md, AGENTS.md, .beads/config.yaml\n3. Construct prompt from template (deterministic: same bead → same prompt)\n4. Include bead ID and `br close <id>` instruction in prompt\n5. Emit `prompt.built` telemetry (bead ID, prompt hash, token estimate)\n\n**Transitions:**\n| Condition | Next State |\n|-----------|-----------|\n| Prompt built successfully | DISPATCHING |\n| Bead context unreadable | HANDLING (outcome: failure, release bead) |\n\n### DISPATCHING\n\n**Entry:** Prompt is ready.\n\n**Actions:**\n1. Load agent adapter configuration (YAML)\n2. Resolve invoke template with prompt, workspace path, environment\n3. Start agent process via rendered command\n4. Record process PID, start time\n5. Emit `agent.dispatched` telemetry (agent name, model, workspace)\n\n**Transitions:**\n| Condition | Next State |\n|-----------|-----------|\n| Agent process started | EXECUTING |\n| Agent binary not found | HANDLING (outcome: failure, release bead) |\n| Adapter config invalid | HANDLING (outcome: failure, release bead) |\n\n### EXECUTING\n\n**Entry:** Agent process is running.\n\n**Actions:**\n1. Wait for agent process to exit\n2. Capture stdout, stderr, exit code\n3. Monitor execution timeout\n4. Continue emitting heartbeats while waiting\n5. Emit `agent.executing` heartbeat telemetry periodically\n\n**Transitions:**\n| Condition | Exit Code | Next State |\n|-----------|-----------|-----------|\n| Agent exited normally | any | HANDLING |\n| Execution timeout exceeded | — | Kill process → HANDLING (outcome: timeout) |\n| Shutdown signal received | — | Kill process → HANDLING (outcome: interrupted) |\n\n### HANDLING\n\n**Entry:** Agent has exited (or was killed). This is where outcome routing happens.\n\n**Actions:**\n1. Classify outcome by exit code\n2. Execute the handler for that outcome class\n3. Emit `bead.outcome` telemetry\n\n**Outcome Table:**\n\n| Outcome | Exit Code | Handler | Bead Action |\n|---------|-----------|---------|-------------|\n| **Success** | 0 | Verify bead was closed by agent. If not, log warning (do not auto-close). | None (agent owns closure) |\n| **Failure** | 1 | Evaluate for mitosis (see Mitosis section). If splittable, split and block parent. If not, release bead (`br update --status open --unassign`). Increment failure count via label. | Split or released |\n| **Timeout** | 124 | Release bead. Add `deferred` label. | Released + deferred |\n| **Crash** | >128 (signal) | Release bead. Create alert bead in workspace. | Released + alert |\n| **Race Lost** | 4 | (Handled at CLAIMING, should not reach here) | N/A |\n| **Interrupted** | — | Release bead. Clean shutdown. | Released |\n| **Agent Not Found** | 127 | Release bead. Emit error. Do not retry (config issue). | Released |\n| **Build Failure** | — | Release bead. Emit error. | Released |\n\n**Agent-owned closure:** NEEDLE does not close beads. The agent is instructed (via prompt) to run `br close <id>` upon successful completion. If the bead is still open after a success exit code, NEEDLE logs a warning but does not intervene. This is a deliberate design choice based on operational experience (see `docs/notes/bead-lifecycle-bugs.md`).\n\n**Transitions:**\n| Condition | Next State |\n|-----------|-----------|\n| Outcome processed | LOGGING |\n\n### LOGGING\n\n**Entry:** Outcome has been handled.\n\n**Actions:**\n1. Record effort: elapsed time, exit code, token count (if extractable), estimated cost\n2. Emit `bead.completed` or `bead.released` telemetry\n3. Update worker state registry (beads processed, current streak)\n4. Reset retry counter and exclusion set\n\n**Transitions:**\n| Condition | Next State |\n|-----------|-----------|\n| Logging complete | SELECTING |\n\n### EXHAUSTED\n\n**Entry:** All strands returned no work.\n\n**Actions:**\n1. Emit `worker.exhausted` telemetry\n2. If `idle_timeout` configured, start countdown\n3. If `idle_action` is `wait`, sleep with exponential backoff (max 60s)\n4. If `idle_action` is `exit`, terminate\n\n**Transitions:**\n| Condition | Next State |\n|-----------|-----------|\n| Backoff expired, retry strands | SELECTING |\n| Idle timeout exceeded | STOPPED |\n| Shutdown signal received | STOPPED |\n\n### STOPPED\n\n**Entry:** Graceful shutdown.\n\n**Actions:**\n1. Release any claimed bead\n2. Deregister from worker state registry\n3. Stop heartbeat emitter\n4. Emit `worker.stopped` telemetry\n5. Exit process\n\n**Transitions:** None (terminal).\n\n### ERRORED\n\n**Entry:** Unrecoverable error.\n\n**Actions:**\n1. Release any claimed bead (best-effort)\n2. Emit `worker.errored` telemetry with error details\n3. Deregister from worker state registry (best-effort)\n4. Exit process with non-zero code\n\n**Transitions:** None (terminal).\n\n## Error Model\n\nErrors are classified into three tiers:\n\n### Tier 1: Transient (retry)\n\nTemporary failures that resolve on their own. The worker retries with backoff.\n\n- Bead store temporarily unreachable\n- Claim race lost\n- Lock contention timeout\n- Agent timeout (may succeed on re-dispatch)\n\n### Tier 2: Bead-scoped (release and continue)\n\nFailures specific to one bead. Release it and move on.\n\n- Agent exited with failure\n- Prompt build failed (bead context unreadable)\n- Agent binary missing\n\n### Tier 3: Worker-scoped (exit)\n\nFailures that affect the worker's ability to function. Exit and let the fleet manager handle it.\n\n- Configuration invalid\n- Bead store persistently unreachable\n- Filesystem full\n- Heartbeat file unwritable\n\n## Invariants\n\nThese must hold at all times. Violation of any invariant is a bug.\n\n1. **A worker holds at most one claimed bead.** There is no pipelining or parallel execution within a single worker.\n\n2. **A claimed bead is always released.** Every path through HANDLING releases the bead unless the agent closed it. There is no path where a bead remains claimed after the worker moves to SELECTING.\n\n3. **Heartbeat is continuous.** From BOOTING to STOPPED/ERRORED, the worker emits heartbeats. A gap in heartbeats means the worker is stuck or dead.\n\n4. **Telemetry is emitted for every state transition.** Silent transitions do not exist.\n\n5. **The exclusion set is bounded.** It is cleared on every transition to SELECTING. It cannot grow unboundedly within a selection cycle because max_retries is finite.\n\n6. **Shutdown is always graceful when possible.** SIGTERM triggers STOPPED, not ERRORED. Only SIGKILL causes ungraceful termination, and heartbeat TTL handles that case.\n\n---\n\n# Architecture\n\n## Module Boundaries\n\nNEEDLE is organized into crates (Rust) or packages (Go) with strict dependency rules. No circular dependencies. Each module has a single responsibility.\n\n```\nneedle (binary)\n├── cli/              CLI parsing, session management\n├── worker/           Worker loop, state machine\n├── strand/           Strand waterfall evaluation\n│   └── splice/       Worker failure documentation\n├── claim/            Atomic claiming, lock management\n├── prompt/           Prompt construction from bead context\n├── dispatch/         Agent adapter loading, process execution\n├── outcome/          Exit code classification, outcome handlers\n├── commit_hook/      Bead-Id trailer injection for git commits\n├── telemetry/        Structured event emission, sinks\n├── health/           Heartbeat, stuck detection, peer monitoring\n├── config/           Hierarchical configuration loading\n├── bead_store/       Abstract bead backend interface\n└── types/            Shared types, error definitions\n```\n\n### Dependency Graph\n\n```\ncli ──► worker ──► strand ──► bead_store\n                │           │\n                │           └──► splice ──► bead_store\n                │                               ├──► telemetry\n                │                               └──► health\n                │\n                ├──► claim ─┘\n                │\n                ├──► prompt ──► bead_store\n                │\n                ├──► dispatch\n                │\n                ├──► outcome ──► bead_store\n                │               ├──► telemetry\n                │               └──► health\n                │\n                ├──► commit_hook ──► types\n                │\n                ├──► telemetry\n                │\n                └──► health ──► telemetry\n\nconfig ◄── (all modules)\ntypes  ◄── (all modules)\n```\n\n**Rule:** Arrows point from dependent to dependency. No module depends on `cli` or `worker` except through the binary entry point. `telemetry`, `config`, and `types` are leaf dependencies available to all modules.\n\n## Data Flow\n\n### Primary Loop\n\n```\nbead_store ──[candidates]──► strand ──[bead_id]──► claim ──[claimed_bead]──►\nprompt ──[prompt_string]──► dispatch ──[process]──► worker(wait) ──►\noutcome ──[result]──► bead_store + telemetry\n```\n\n### Telemetry Flow\n\n```\n                    ┌─────────────────────────┐\n                    │    Telemetry Collector   │\n                    └────────────┬────────────┘\n                                 │\n              ┌──────────────────┼──────────────────┐\n              ▼                  ▼                   ▼\n        ┌──────────┐     ┌────────────┐      ┌──────────┐\n        │ File Sink│     │ Stdout Sink│      │ Hook Sink│\n        │ (JSONL)  │     │ (human)    │      │ (webhook)│\n        └──────────┘     └────────────┘      └──────────┘\n```\n\n### Configuration Flow\n\n```\n  CLI args ──► env vars ──► workspace .needle.yaml ──► global ~/.needle/config.yaml ──► defaults\n  (highest)                                                                              (lowest)\n```\n\n## Module Specifications\n\n### bead_store\n\nAbstract interface to any bead backend. The primary implementation wraps the `br` CLI, but the trait allows future backends (direct SQLite, HTTP API, etc.).\n\n```\ntrait BeadStore {\n    fn ready(workspace: &Path, filters: &Filters) -> Result<Vec<Bead>>\n    fn show(id: &BeadId) -> Result<Bead>\n    fn claim(id: &BeadId, actor: &str) -> Result<ClaimResult>\n    fn release(id: &BeadId) -> Result<()>\n    fn labels(id: &BeadId) -> Result<Vec<String>>\n    fn add_label(id: &BeadId, label: &str) -> Result<()>\n    fn doctor_repair() -> Result<RepairReport>\n}\n\nenum ClaimResult {\n    Claimed(Bead),\n    RaceLost { claimed_by: String },\n    NotClaimable { reason: String },\n}\n```\n\n**Design notes:**\n- All methods return `Result`. Silent failures do not exist.\n- `ClaimResult` is an enum, not a boolean. The caller must handle each variant.\n- `ready()` accepts filters (status, assignee, labels, workspace) to push filtering to the backend.\n- The `br` CLI implementation shells out to `br` with `--json` and parses output via `serde_json`.\n- JSON parsing failures are explicit errors, not empty results (learned from starvation false positives).\n\n### claim\n\nWraps `bead_store.claim()` with workspace-level serialization and retry logic.\n\n```\nstruct Claimer {\n    bead_store: Box<dyn BeadStore>,\n    lock_dir: PathBuf,       // per-workspace flock directory\n    max_retries: u32,        // default: 5\n    retry_backoff_ms: u64,   // default: 100\n}\n\nimpl Claimer {\n    fn claim_next(\n        &self,\n        candidates: &[Bead],\n        actor: &str,\n        exclusions: &HashSet<BeadId>,\n    ) -> Result<ClaimOutcome>\n}\n\nenum ClaimOutcome {\n    Claimed(Bead),\n    AllRaceLost,\n    NoCandidates,\n    StoreError(Error),\n}\n```\n\n**Design notes:**\n- The flock is per-workspace, not per-bead. This serializes all claim operations within a workspace, preventing thundering herd (learned from `docs/notes/claim-race-conditions.md`).\n- The lock is held only for the duration of the `br update --claim` call, not for the entire bead execution.\n- Retry logic is internal to the Claimer. The caller receives a final `ClaimOutcome`.\n\n### strand\n\nEvaluates the strand waterfall and returns the next action.\n\n```\ntrait Strand {\n    fn name(&self) -> &str\n    fn enabled(&self, config: &Config) -> bool\n    fn evaluate(&self, context: &WorkerContext) -> Result<StrandResult>\n}\n\nenum StrandResult {\n    BeadFound(Vec<Bead>),    // candidates for claiming\n    WorkCreated,              // strand created new beads (e.g., weave)\n    NoWork,                   // fall through to next strand\n    Error(StrandError),       // strand failed, fall through\n}\n```\n\nEach strand implements the trait. The runner evaluates them in order:\n\n```\nfn run_strands(strands: &[Box<dyn Strand>], ctx: &WorkerContext) -> StrandWaterfallResult {\n    for strand in strands {\n        if !strand.enabled(&ctx.config) { continue; }\n        match strand.evaluate(ctx)? {\n            StrandResult::BeadFound(candidates) => return Ok(candidates),\n            StrandResult::WorkCreated => return Ok(/* re-evaluate from strand 1 */),\n            StrandResult::NoWork => continue,\n            StrandResult::Error(e) => { emit_telemetry(e); continue; }\n        }\n    }\n    StrandWaterfallResult::Exhausted\n}\n```\n\n### dispatch\n\nLoads agent adapters and executes the agent process.\n\n```\nstruct Dispatcher {\n    adapters: HashMap<String, AgentAdapter>,\n}\n\nstruct AgentAdapter {\n    name: String,\n    invoke_template: String,   // e.g., \"cd {workspace} && claude --print\"\n    input_method: InputMethod,  // Stdin, File, Args\n    timeout: Duration,\n    environment: HashMap<String, String>,\n}\n\nenum InputMethod {\n    Stdin,                      // pipe prompt to stdin\n    File { path_template: String },  // write prompt to file, pass path\n    Args { flag: String },      // pass prompt as --flag value\n}\n\nstruct ExecutionResult {\n    exit_code: i32,\n    stdout: String,\n    stderr: String,\n    elapsed: Duration,\n    pid: u32,\n}\n```\n\n**Design notes:**\n- Adapters are loaded from YAML config files. Adding a new agent requires only a new YAML file.\n- The invoke template is rendered with variables: `{workspace}`, `{prompt_file}`, `{bead_id}`, `{model}`.\n- The dispatcher does not interpret agent output. It captures raw exit code, stdout, and stderr, then passes them to the outcome handler.\n- Timeout is enforced by the dispatcher, not the agent. If the agent exceeds the timeout, the dispatcher kills the process and returns exit code 124.\n\n### outcome\n\nClassifies the agent's exit and routes to the appropriate handler.\n\n```\nenum Outcome {\n    Success,           // exit 0\n    Failure,           // exit 1\n    Timeout,           // exit 124 (set by dispatcher)\n    Crash(i32),        // exit >128 (signal)\n    AgentNotFound,     // exit 127\n    Interrupted,       // shutdown signal during execution\n}\n\nfn classify(result: &ExecutionResult, was_interrupted: bool) -> Outcome {\n    if was_interrupted { return Outcome::Interrupted; }\n    match result.exit_code {\n        0   => Outcome::Success,\n        1   => Outcome::Failure,\n        124 => Outcome::Timeout,\n        127 => Outcome::AgentNotFound,\n        c if c > 128 => Outcome::Crash(c),\n        _   => Outcome::Failure,  // treat unknown codes as failure\n    }\n}\n```\n\n**Design notes:**\n- The match is exhaustive. Every exit code maps to exactly one outcome.\n- The `Outcome` enum is the sole input to the handler. There is no ad-hoc exit code checking elsewhere.\n- `Outcome::Success` does NOT mean the bead is closed. It means the agent exited cleanly. Bead closure is the agent's responsibility.\n\n### telemetry\n\n```\nfn emit(event: TelemetryEvent)\n\nstruct TelemetryEvent {\n    timestamp: DateTime<Utc>,\n    worker_id: String,\n    event_type: String,       // e.g., \"bead.claim.attempted\"\n    bead_id: Option<BeadId>,\n    workspace: Option<PathBuf>,\n    data: serde_json::Value,  // event-specific payload\n    duration_ms: Option<u64>,\n    trace_id: Option<TraceId>,   // W3C trace ID of enclosing span, if OTLP sink enabled\n    span_id: Option<SpanId>,     // W3C span ID of enclosing span, if OTLP sink enabled\n}\n\ntrait Sink: Send + Sync {\n    fn accept(&self, event: &TelemetryEvent) -> Result<()>;\n    fn flush(&self, deadline: Duration) -> Result<()>;\n}\n\n// Built-in sinks: FileSink, StdoutSink, HookSink, OtlpSink.\n// OtlpSink wraps the OpenTelemetry SDK (traces + metrics + logs providers)\n// and translates TelemetryEvent into the appropriate signal per the\n// Semantic Mapping table in the Telemetry chapter.\n```\n\n### health\n\n```\nstruct HealthMonitor {\n    heartbeat_interval: Duration,    // default: 30s\n    heartbeat_ttl: Duration,         // default: 5min\n    heartbeat_dir: PathBuf,          // ~/.needle/state/heartbeats/\n    peer_check_interval: Duration,   // default: 60s\n}\n\nimpl HealthMonitor {\n    fn emit_heartbeat(&self, state: &WorkerState) -> Result<()>\n    fn check_peers(&self) -> Result<Vec<PeerStatus>>\n    fn cleanup_stale_claims(&self, store: &dyn BeadStore) -> Result<u32>\n}\n\nenum PeerStatus {\n    Alive { last_seen: DateTime<Utc>, current_bead: Option<BeadId> },\n    Stale { last_seen: DateTime<Utc>, claimed_bead: Option<BeadId> },\n    Dead { heartbeat_file: PathBuf },\n}\n```\n\n### commit_hook\n\nInjects `Bead-Id:` trailers into git commits after successful bead closure, for HOOP bead_commit_index integration.\n\n```\nasync fn inject_bead_id_trailer(\n    workspace: &Path,\n    bead_id: &BeadId,\n    pre_dispatch_head: &str,\n) -> Result<()>\n\nfn git_head(workspace: &str) -> Result<String>\n```\n\n**Functionality:**\n- When a bead closes with a commit artifact (agent made commits), NEEDLE amends the latest commit to include a `Bead-Id: <id>` trailer\n- Only acts when HEAD moved since `pre_dispatch_head` (i.e. the agent made at least one commit)\n- Idempotent: checks if trailer is already present before injecting\n- Returns `Ok(())` in all no-op cases (not a git repo, no new commits, trailer already present)\n\n**Trailer format:**\n```\nBead-Id: nd-a3f8\n```\n\n**Integration context:**\n- HOOP's `bead_commit_index` picks up the trailer via `git log --format=%(trailers:key=Bead-Id,valueonly,separator=,)`\n- Enables bidirectional traceability: beads → commits and commits → beads\n- Executed after successful bead close, before returning to SELECTING state\n\n**Timeouts:**\n- `git rev-parse HEAD`: 10s timeout\n- `git commit --amend`: 30s timeout\n\n**Design notes:**\n- Errors are logged as non-fatal warnings; they do not fail the bead processing cycle\n- The trailer is appended via `git commit --amend --no-edit --trailer \"Bead-Id: <id>\"`\n- Multiple beads can be tracked in a single commit (comma-separated in trailer value)\n\n## Binary Structure\n\nNEEDLE is a single binary with subcommands:\n\n```\nneedle run [--workspace PATH] [--agent NAME] [--count N] [--identifier NAME]\nneedle stop [--all | --identifier NAME]\nneedle list [--format table|json]\nneedle attach <identifier>\nneedle status [--format table|json]\nneedle config [--get KEY | --set KEY VALUE]\nneedle doctor [--repair]\nneedle version\n```\n\n### Session Management\n\n`needle run` creates tmux sessions for each worker. Session naming follows the pattern:\n\n```\nneedle-{agent}-{provider}-{model}-{identifier}\n```\n\nExamples:\n```\nneedle-claude-anthropic-sonnet-alpha\nneedle-opencode-alibaba-qwen-bravo\nneedle-codex-openai-gpt4-charlie\n```\n\n`--count=N` launches N workers with sequential NATO alphabet identifiers (alpha, bravo, charlie, ...). Workers are launched with staggered delay (default: 2s between launches) to prevent thundering herd on startup (learned from `docs/notes/operational-fleet-lessons.md`).\n\n### CLI Help System\n\nEvery subcommand and flag is discoverable via `--help` or `-h`. Help text is embedded in the binary and generated from the same source as the CLI parser (e.g., `clap` derive macros in Rust).\n\n**Top-level help:**\n\n```\n$ needle --help\n\nNEEDLE — Navigates Every Enqueued Deliverable, Logs Effort\n\nDeterministic bead processing with explicit outcome paths.\n\nUsage: needle <COMMAND>\n\nCommands:\n  run          Launch worker(s) to process beads\n  stop         Stop running worker(s)\n  list         List active workers\n  attach       Attach to a worker's tmux session\n  status       Show fleet status, bead counts, and cost summary\n  config       View or modify configuration\n  doctor       Check system health and repair\n  test-agent   Validate an agent adapter\n  logs         Query telemetry logs\n  rollback     Roll back to previous stable binary\n  version      Show version information\n  help         Print this message or the help of a subcommand\n\nOptions:\n  -h, --help     Print help\n  -V, --version  Print version\n```\n\n**Subcommand help (example):**\n\n```\n$ needle run --help\n\nLaunch worker(s) to process beads\n\nUsage: needle run [OPTIONS]\n\nOptions:\n  -w, --workspace <PATH>     Workspace to process beads from [default: config value]\n  -a, --agent <NAME>         Agent adapter to use [default: config value]\n  -c, --count <N>            Number of workers to launch [default: 1]\n  -i, --identifier <NAME>    Worker identifier (overrides NATO naming)\n  -t, --timeout <SECONDS>    Agent execution timeout [default: config value]\n      --resume               Resume an existing worker session (used by hot-reload)\n  -h, --help                 Print help\n```\n\n**Design notes:**\n- Every flag has a one-line description\n- Default values shown in brackets (sourced from config)\n- Subcommand grouping follows the lifecycle: launch → monitor → operate → maintain\n- `needle help <command>` and `needle <command> --help` are equivalent\n- Help output is plain text, no colors, suitable for piping to other tools or agents\n\n---\n\n# Strand Waterfall\n\nStrands are NEEDLE's strategy for finding work. They are evaluated in strict sequence — the first strand that yields actionable work wins. When a strand returns `NoWork`, the worker falls through to the next.\n\nThe waterfall is the answer to \"what does a worker do when it has no beads?\" It is not a priority system for beads (that's handled by deterministic ordering within each strand). It is a priority system for *strategies*.\n\n## Waterfall Sequence\n\n```\n  Strand 1: PLUCK ──── primary work from assigned workspace\n       │ no work\n       ▼\n  Strand 2: MEND ───── cleanup: stale claims, orphaned locks, health\n       │ nothing to clean\n       ▼\n  Strand 3: EXPLORE ── look for work in other configured workspaces\n       │ no work\n       ▼\n  Strand 4: WEAVE ──── create beads from documentation gaps (opt-in)\n       │ no gaps or disabled\n       ▼\n  Strand 5: UNRAVEL ── propose alternatives for HUMAN-blocked beads (opt-in)\n       │ none or disabled\n       ▼\n  Strand 6: PULSE ──── codebase health scan, auto-generate beads (opt-in)\n       │ no issues or disabled\n       ▼\n  Strand 7: REFLECT ── consolidate learnings from recent beads\n       │ consolidation complete or not needed\n       ▼\n  Strand 8: SPLICE ──── worker failure documentation\n       │ no failures\n       ▼\n  Strand 9: KNOT ───── alert human, enter backoff\n       │\n       ▼\n  → EXHAUSTED (backoff and retry from Strand 1)\n```\n\n## Strand 1: Pluck\n\n**Purpose:** Process beads from the worker's assigned workspace. This is the primary work strand and will handle >90% of all bead processing.\n\n**Invokes agent:** Yes.\n\n**Entry condition:** Worker has an assigned workspace with a `.beads/` directory.\n\n**Algorithm:**\n1. Query bead store: `br ready --unassigned --json` in workspace\n2. Filter: exclude beads with labels `deferred`, `human`, `blocked`\n3. Filter: exclude beads in the current retry exclusion set\n4. Sort: priority (ascending, 0 = highest), then creation time (ascending, oldest first)\n5. Return sorted candidates for claiming\n\n**Exit conditions:**\n| Result | Action |\n|--------|--------|\n| Candidates found | Return `BeadFound(candidates)` → worker proceeds to CLAIMING |\n| No candidates (queue empty) | Return `NoWork` → fall through to Strand 2 |\n| Bead store error | Emit telemetry, return `Error` → fall through to Strand 2 |\n\n**Determinism guarantee:** The sort key `(priority, created_at)` produces the same ordering for all workers viewing the same queue state. Workers will compete for the same top-priority bead, and the claim mechanism resolves contention.\n\n## Strand 2: Mend\n\n**Purpose:** Maintenance and cleanup operations that keep the bead store healthy. Runs before Explore because cleaning up stale claims or broken dependencies in the home workspace may unblock beads here — no need to roam if local work is just stuck.\n\n**Invokes agent:** No.\n\n**Entry condition:** Strand 1 returned no work.\n\n**Algorithm:**\n1. **Stale claim cleanup:** Find beads with status `in_progress` where the assigned worker has no active heartbeat (TTL expired). Release them.\n2. **Orphaned lock cleanup:** Find workspace lock files older than TTL. Remove them.\n3. **Dependency cleanup:** Find closed beads that are still listed as blockers on open beads. Remove the stale dependency links.\n4. **Database health:** Run `br doctor` (not `--repair` unless errors found).\n\n**Exit conditions:**\n| Result | Action |\n|--------|--------|\n| Cleanup performed | Return `WorkCreated` → restart from Strand 1 (released beads may now be claimable) |\n| Nothing to clean | Return `NoWork` → fall through to Strand 3 |\n\n**Design notes (from `docs/notes/bead-lifecycle-bugs.md`):**\n- Stale dependency links caused permanent blocking in NEEDLE-deprecated. Mend must clean these.\n- Distinguish \"did work\" from \"found nothing\" — v1 had an infinite loop where mend returned success on failed releases.\n\n## Strand 3: Explore\n\n**Purpose:** Discover work in other configured workspaces when the home workspace is empty and clean.\n\n**Invokes agent:** No. Explore only finds candidates — execution happens back through the standard CLAIMING → DISPATCHING flow.\n\n**Entry condition:** Strands 1-2 returned no work. Explore is enabled in config. At least one additional workspace is configured.\n\n**Algorithm:**\n1. Read configured workspace list from config (explicit paths, no filesystem scanning)\n2. For each workspace (in configured order):\n   a. Check `.beads/` directory exists\n   b. Query `br ready --unassigned --json`\n   c. If candidates found, return them with workspace context\n3. If no workspace has work, return `NoWork`\n\n**Exit conditions:**\n| Result | Action |\n|--------|--------|\n| Candidates found in another workspace | Return `BeadFound(candidates)` with workspace override |\n| No candidates in any workspace | Return `NoWork` → fall through to Strand 4 |\n\n**Design notes (from `docs/notes/explore-strand-bugs.md`):**\n- **No filesystem scanning.** NEEDLE-deprecated's `find`-based discovery caused 35+ CPU load with 40 workers. Workspaces must be explicitly configured.\n- **No upward traversal.** The v1 explore strand walked up parent directories to `/home`, then `/`. This is eliminated.\n- **Workspace list is static** for the duration of a session. It is read from config at boot and not re-evaluated.\n- **Workers do not permanently relocate.** If a worker finds work in another workspace, it processes that bead and returns to its home workspace for the next cycle.\n\n## Strand 4: Weave (opt-in)\n\n**Purpose:** Analyze workspace documentation for gaps and create new beads to address them.\n\n**Invokes agent:** Yes — uses the agent to analyze documentation and propose beads.\n\n**Entry condition:** Strands 1-3 (Pluck, Mend, Explore) returned no work. Weave is explicitly enabled in workspace config (`strands.weave.enabled: true`).\n\n**Algorithm:**\n1. Identify documentation files (README, AGENTS.md, docs/, etc.)\n2. Dispatch agent with gap-analysis prompt\n3. Agent proposes new beads (as structured output)\n4. Create beads via bead store\n5. Return `WorkCreated` → restart from Strand 1\n\n**Guardrails (from `docs/notes/self-modification-risks.md`):**\n- **Max beads per weave run:** Configurable, default 5. Prevents unbounded bead creation.\n- **Cooldown period:** Minimum time between weave runs per workspace, default 24h.\n- **Seen-issues deduplication:** Track previously created weave beads to prevent duplicates.\n- **Workspace exclusion:** Weave is disabled for NEEDLE's own workspace by default. Workers must not create work for their own orchestrator without human approval.\n- **Human review label:** Weave-created beads are labeled `weave-generated` for easy filtering.\n\n**Exit conditions:**\n| Result | Action |\n|--------|--------|\n| Beads created | Return `WorkCreated` → restart from Strand 1 |\n| No gaps found | Return `NoWork` → fall through to Strand 5 |\n| Disabled | Return `NoWork` → fall through to Strand 5 |\n\n## Strand 5: Unravel (opt-in)\n\n**Purpose:** For beads labeled `human` (requiring human decision), propose alternative approaches that an agent could execute instead.\n\n**Invokes agent:** Yes — uses the agent to analyze the blocked bead and propose workarounds.\n\n**Entry condition:** Strands 1-4 returned no work. Unravel is explicitly enabled. There are beads with `human` label in the workspace.\n\n**Algorithm:**\n1. Query beads with `human` label\n2. For each (up to `max_unravel_per_run`, default 3):\n   a. Dispatch agent with the bead context and a prompt asking for alternative approaches\n   b. If agent proposes viable alternatives, create child beads with `alternative` label\n   c. Do NOT close or modify the original `human` bead\n3. Return `WorkCreated` if alternatives were created\n\n**Guardrails:**\n- Original `human` bead is never modified or closed\n- Alternative beads are linked as children (informational, not blocking)\n- Max alternatives per `human` bead: configurable, default 2\n- Cooldown: don't re-analyze a `human` bead that was analyzed within the last 7 days\n\n**Exit conditions:**\n| Result | Action |\n|--------|--------|\n| Alternatives created | Return `WorkCreated` → restart from Strand 1 |\n| No `human` beads or no alternatives viable | Return `NoWork` → fall through to Strand 6 |\n| Disabled | Return `NoWork` → fall through to Strand 6 |\n\n## Strand 6: Pulse (opt-in)\n\n**Purpose:** Scan the codebase for health issues (stale TODOs, missing tests, dependency drift, linting) and create beads for significant findings.\n\n**Invokes agent:** Yes — uses the agent (or external tools) to scan the codebase.\n\n**Entry condition:** Strands 1-5 returned no work. Pulse is explicitly enabled. Cooldown has expired.\n\n**Algorithm:**\n1. Run configured scanners (linters, test coverage, dependency checkers, TODO scanners)\n2. Compare results against previous scan (stored in `~/.needle/state/pulse/`)\n3. For new issues exceeding severity threshold, create beads\n4. Update last-scan state\n\n**Guardrails:**\n- **Max beads per pulse run:** Configurable, default 10\n- **Cooldown:** Default 48h between scans\n- **Severity threshold:** Only create beads for issues above configured severity\n- **Deduplication:** Track seen issues to prevent duplicate beads across scans\n- **Workspace exclusion:** Same as Weave — disabled for NEEDLE's own workspace by default\n\n**Exit conditions:**\n| Result | Action |\n|--------|--------|\n| Beads created | Return `WorkCreated` → restart from Strand 1 |\n| No new issues | Return `NoWork` → fall through to Strand 7 |\n| Disabled | Return `NoWork` → fall through to Strand 7 |\n\n## Strand 7: Reflect (opt-in)\n\n**Purpose:** Consolidate learnings from recent bead work into a shared knowledge base (`.beads/learnings.md`), promoting recurring patterns to reusable skill files. This meta-analysis strand ensures that insights from completed work are captured and made available to future work.\n\n**Invokes agent:** Yes — uses a consolidation-specific prompt.\n\n**Entry condition:** Strands 1-6 returned no work. Reflect is explicitly enabled in workspace config (`strands.reflect.enabled: true`). At least N beads have been closed since last consolidation (configurable, default: 10). At least T hours since last consolidation (configurable, default: 24).\n\n**Algorithm (KAIROS-inspired four-phase cycle):**\n\n1. **Orient:** Read current `.beads/learnings.md` and existing skill files in `.beads/skills/`. Check file sizes to ensure they're within bounds.\n2. **Gather:** Read bead close bodies from `.beads/issues.jsonl` for beads closed since last consolidation. Read available traces for failed beads to capture failure patterns.\n3. **Consolidate:**\n   - Extract retrospective blocks from close bodies\n   - Identify patterns across multiple beads (same failure mode, same codebase quirk, workaround that works)\n   - Merge new learnings into `.beads/learnings.md`, deduplicating against existing entries\n   - Convert relative references to absolute (bead IDs, dates)\n   - If a learning appears 3+ times across different beads, promote to a skill file in `.beads/skills/`\n   - If a learning contradicts an existing entry, resolve in favor of the newer evidence\n4. **Prune:**\n   - Remove entries older than 90 days without reinforcement\n   - Compress similar entries into single entries\n   - Ensure total learnings stay under 80 entries (configurable)\n\n**Guardrails:**\n- **Cooldown:** Minimum 24 hours between consolidation runs (configurable)\n- **Max learnings created per run:** 10 (configurable)\n- **Max skills promoted per run:** 3 (configurable)\n- **Read-only on CLAUDE.md:** The consolidation agent receives the workspace CLAUDE.md as context but MUST NOT modify it. CLAUDE.md changes require explicit human approval.\n- **Workspace exclusion:** Reflect is disabled for NEEDLE's own workspace by default. Workers must not modify their own orchestrator's knowledge base without human approval.\n\n**Exit conditions:**\n| Result | Action |\n|--------|--------|\n| Consolidation performed | Return `WorkCreated` → restart from Strand 1 (learnings may unblock new work) |\n| Not enough data since last run | Return `NoWork` → fall through to Strand 8 |\n| Disabled or cooldown active | Return `NoWork` → fall through to Strand 8 |\n\n**Telemetry:**\n| Event Type | Emitted When | Data Fields |\n|------------|-------------|-------------|\n| `reflect.started` | Consolidation starts | `beads_since_last`, `current_learnings_count` |\n| `reflect.consolidated` | Consolidation completes | `learnings_added`, `learnings_pruned`, `skills_promoted`, `contradictions_resolved` |\n| `reflect.skipped` | Consolidation skipped | `reason` (cooldown, insufficient data, disabled) |\n\n**Learning persistence:** `.beads/learnings.md` is the authoritative source. Workers automatically append it to `context_files` during prompt building (via the Config module's `context_files` discovery). No manual config required — workers always see the latest learnings.\n\n**Session transcript analysis:** Reflect analyzes both bead close bodies (structured outcomes) and Claude Code session transcripts (decision-making process) when available. Transcripts are stored as JSONL in `.claude/projects/<project-hash>/<session-uuid>.jsonl` and contain richer signal: failed attempts, tool call sequences, recovery strategies, and decision points.\n\n**Integration with prompt building:** If `.beads/learnings.md` exists in a workspace, NEEDLE automatically appends it to `context_files` during prompt building. Workers always see the latest learnings without manual configuration.\n\n## Strand 8: Splice\n\n**Purpose:** Document worker failures (crashed workers and live-but-looping workers) by creating failure beads in a configured report workspace.\n\n**Invokes agent:** No.\n\n**Entry condition:** Strand 7 returned no work. Splice is enabled in config (default: true). Heartbeat files exist in the heartbeat directory.\n\n**Algorithm:**\n\n1. **Scan for dead workers (stale heartbeat + dead tmux session):**\n   - Read all heartbeat files from the heartbeat directory\n   - For each heartbeat older than `stale_threshold_secs` (default: 300s):\n     - Check if the tmux session is still alive\n     - If session is dead, this is a failed worker\n\n2. **Scan for live-but-looping workers (optional, when `detect_live_loops: true`):**\n   - For each worker with a fresh heartbeat:\n     - Read the tail of their JSONL log file\n     - Detect three loop patterns:\n       - **Claim churn:** Repeated `bead.claim.race_lost` events for the same bead\n       - **State ping-pong:** Rapid cycling between a small set of states without forward progress\n       - **Log runaway:** Excessive JSONL growth without `agent.completed` events\n\n3. **Create failure beads:**\n   - For each undocumented failure or loop pattern:\n     - Create a bead in the configured `report_workspace`\n     - Include worker details, session info, and evidence in the bead body\n   - Track documented sessions/loops in `splice_state.json` to prevent duplicates\n\n4. **Return `WorkCreated` if any beads were created, otherwise `NoWork`**\n\n**Exit conditions:**\n| Result | Action |\n|--------|--------|\n| Failure beads created | Return `WorkCreated` → restart from Strand 1 |\n| No new failures detected | Return `NoWork` → fall through to Strand 9 |\n\n**State persistence:** `splice_state.json` tracks which session IDs and loop patterns have already been documented, preventing duplicate failure beads for the same dead/looping worker.\n\n**Loop detection thresholds:**\n- `claim_churn_threshold`: Number of race-lost events for same bead before flagging (default: 20)\n- `log_runaway_bytes`: Max JSONL growth in `live_loop_window_secs` without completion (default: 10 MiB)\n- `live_loop_window_secs`: Time window for log runaway check (default: 300s)\n\n## Strand 9: Knot\n\n**Purpose:** All work-finding strategies are exhausted. Alert the human and enter backoff.\n\n**Invokes agent:** No.\n\n**Entry condition:** Strands 1-8 all returned `NoWork`.\n\n**Algorithm:**\n1. Determine alert state:\n   - **First time exhausted:** Emit `worker.idle` telemetry. Start backoff timer.\n   - **Repeated exhaustion (>N cycles):** Create alert bead (if not already created within cooldown).\n2. Verify before alerting (three-state check):\n   a. **No beads exist:** Queue is genuinely empty. Normal idle.\n   b. **All beads claimed:** Other workers are busy. Normal contention. Wait.\n   c. **Beads invisible:** Configuration error (wrong workspace, broken filter). Alert.\n3. Return `NoWork` → worker enters EXHAUSTED state with backoff\n\n**Guardrails (from `docs/notes/worker-starvation-lessons.md`):**\n- **Verify independently before alerting.** The v1 system had 100% false positive rate because it used the same broken code path for verification.\n- **Three-state model.** \"No work\" is three different conditions with different responses. Conflating them caused the false positive spiral.\n- **Rate limit alerts:** Max 1 alert bead per workspace per hour.\n- **Alert includes diagnostics:** Bead counts, worker count, claimed count, config snapshot.\n\n**Exit conditions:**\n| Result | Action |\n|--------|--------|\n| Always | Return `NoWork` → EXHAUSTED state |\n\n## Strand Configuration\n\n```yaml\n# ~/.needle/config.yaml or .needle.yaml\nstrands:\n  pluck:\n    enabled: true           # always on, cannot be disabled\n  explore:\n    enabled: true\n    workspaces:             # explicit list, no auto-discovery\n      - /home/coder/project-a\n      - /home/coder/project-b\n  mend:\n    enabled: true\n    stale_claim_ttl: 300    # seconds before a claimed bead is considered stale\n    lock_ttl: 600           # seconds before an orphaned lock is removed\n  weave:\n    enabled: false          # opt-in\n    max_beads_per_run: 5\n    cooldown_hours: 24\n    exclude_workspaces: []  # workspaces where weave is forbidden\n  unravel:\n    enabled: false          # opt-in\n    max_per_run: 3\n    cooldown_days: 7\n  pulse:\n    enabled: false          # opt-in\n    max_beads_per_run: 10\n    cooldown_hours: 48\n    severity_threshold: warning\n    scanners:\n      - name: todo-scanner\n        command: \"grep -rn 'TODO\\\\|FIXME' {workspace}/src\"\n      - name: test-coverage\n        command: \"cargo tarpaulin --skip-clean -o json\"\n  reflect:\n    enabled: true           # on by default (unlike weave/unravel/pulse)\n    min_beads_since_last: 10   # minimum closed beads before consolidation\n    cooldown_hours: 24\n    max_learnings_per_run: 10\n    max_skills_per_run: 3\n    learning_retention_days: 90\n    max_learnings: 80\n  splice:\n    enabled: true           # always on, cannot be disabled\n    stale_threshold_secs: 300   # seconds before heartbeat considered stale\n    report_workspace: null      # workspace for failure beads (null = current store)\n    detect_live_loops: true     # scan for stuck workers in JSONL tail\n    live_loop_scan_events: 200  # max events to scan per worker\n    claim_churn_threshold: 20   # race-lost events for same bead before flagging\n    log_runaway_bytes: 10485760 # 10 MiB, max growth without completion\n    live_loop_window_secs: 300   # time window for log runaway check\n  knot:\n    enabled: true           # always on, cannot be disabled\n    alert_cooldown_minutes: 60\n    exhaustion_threshold: 3 # cycles before creating alert bead\n```\n\n---\n\n# Mitosis\n\nMitosis is NEEDLE's mechanism for splitting a bead that represents multiple tasks into smaller, focused child beads. It is triggered on failure — when a bead fails execution, NEEDLE evaluates whether it should be decomposed before retrying.\n\n## Split Criteria\n\nA bead is splittable when it describes **multiple independent tasks**. This is a semantic determination, not a numeric one. The agent analyzes the bead and answers one question: \"Does this bead ask for more than one independent unit of work?\"\n\n**Valid reasons to split:**\n- The bead describes multiple distinct deliverables (\"add endpoint AND write migration AND update tests\")\n- The deliverables have a dependency relationship (migration before endpoint)\n- Each deliverable is independently closable\n\n**Not valid reasons to split:**\n- The bead is long (a single complex task can be long and still atomic)\n- The bead failed once (failure means the task is hard, not composite)\n- The bead has many acceptance criteria (criteria validate one task, not separate tasks)\n\nIf the agent determines the bead is a single task, mitosis does not apply. The bead is released for retry or deferred.\n\n## Child-Aware Deduplication\n\nBefore creating any child bead, NEEDLE reads the parent's existing children. If a previous mitosis pass already created children for this parent, the proposed children are compared against them. Matching children are skipped; only novel tasks are created.\n\n```\nBead fails\n    │\n    ▼\nAgent analyzes: \"Multiple independent tasks?\"\n    │\n    ├── No → Release for retry or defer\n    │\n    └── Yes → Propose N children with dependencies\n                │\n                ▼\n          Read parent's existing children\n          (br show <parent> --json → dependencies)\n                │\n          For each proposed child:\n                │\n                ├── Parent already has a child covering this? → Skip\n                │\n                └── Novel task → Create child, link as blocking parent\n\n          If any children created:\n                └── Parent remains in_progress, blocked by children\n          If all children already existed:\n                └── No-op (split already happened)\n```\n\nThis makes duplicate splits structurally impossible. The parent's child list is the single source of truth. A second worker encountering the same parent sees the existing children and creates nothing new.\n\n## Concurrency Safety\n\nMitosis uses the same per-workspace flock as the claiming protocol. The flock is held for the entire mitosis operation: read existing children → create new children → update parent dependencies. This serializes mitosis across workers within a workspace.\n\nIf two workers both hold a failed bead and attempt mitosis on the same parent simultaneously, the flock ensures one completes first. The second worker enters the flock, reads the children just created by the first, and skips all proposed children as duplicates.\n\n## When Mitosis Runs\n\nMitosis is evaluated in the HANDLING state when the outcome is **Failure** (exit code 1):\n\n1. Check if mitosis is enabled for the workspace (configurable, default: true)\n2. Check if this is the bead's **first failure** (mitosis runs once, not on every retry)\n3. Acquire workspace flock\n4. Dispatch agent with mitosis analysis prompt: bead context + \"Does this describe multiple tasks?\"\n5. If agent proposes children:\n   a. Read parent's existing children\n   b. Create only novel children with appropriate dependencies\n   c. Parent is blocked by children (remains claimed, status changes to blocked)\n6. Release workspace flock\n7. Emit `bead.mitosis` telemetry (children proposed, children created, children skipped)\n\nIf mitosis produces children, the parent is not released — it is blocked until its children complete. When all children are closed, the parent becomes unblocked and re-enters the queue for a final pass (or the mend strand clears the stale dependency and it resolves naturally).\n\nIf mitosis determines the bead is a single task, normal failure handling applies: release and increment failure count.\n\n## Mitosis Configuration\n\n```yaml\n# ~/.needle/config.yaml or .needle.yaml\nmitosis:\n  enabled: true                # enable/disable per workspace\n  first_failure_only: true     # only evaluate on first failure, not retries\n```\n\n## Telemetry\n\n| Event Type | Emitted When | Data Fields |\n|------------|-------------|-------------|\n| `bead.mitosis.evaluated` | Agent analyzed bead for splitting | `bead_id`, `splittable` (bool), `proposed_children` (count) |\n| `bead.mitosis.split` | Children created | `parent_id`, `children_created` (count), `children_skipped` (count), `child_ids` |\n| `bead.mitosis.skipped` | All proposed children already exist | `parent_id`, `existing_children` (count) |\n\n---\n\n# Concurrency\n\nMultiple NEEDLE workers operate in the same environment simultaneously. This section specifies how they coordinate without a central orchestrator.\n\n## Coordination Model\n\nNEEDLE uses **decentralized coordination through shared state**. There is no coordinator process, no leader election, no message passing between workers. All coordination happens through:\n\n1. **Atomic bead claims** (SQLite transactions via `br update --claim`)\n2. **Workspace-level flock** (POSIX file locks for claim serialization)\n3. **File-based heartbeats** (health monitoring and stale detection)\n4. **Worker state registry** (shared JSON file for fleet awareness)\n\nThis is approach #1 (SQLite transactions) from `docs/research/concurrency-approaches-compared.md`, augmented with file-based serialization to address the thundering herd problem.\n\n## Claiming Protocol\n\n### The Thundering Herd Problem\n\nWithout serialization, all workers compute the same priority ordering and race to claim the same top bead. N-1 workers lose, retry, compute the same ordering again, and race for the second bead. This wastes O(N^2) claim attempts.\n\n### Solution: Per-Workspace Flock\n\n```\n┌─────────────┐      ┌─────────────┐      ┌─────────────┐\n│  Worker A    │      │  Worker B    │      │  Worker C    │\n│  SELECT bead │      │  SELECT bead │      │  SELECT bead │\n└──────┬──────┘      └──────┬──────┘      └──────┬──────┘\n       │                     │                     │\n       ▼                     ▼                     ▼\n   ┌───────────────────────────────────────────────────┐\n   │          flock(/tmp/needle-claim-<workspace>.lock) │\n   │                                                    │\n   │  A enters ─► claim bead-1 ─► success ─► release   │\n   │  B enters ─► claim bead-2 ─► success ─► release   │\n   │  C enters ─► claim bead-3 ─► success ─► release   │\n   └───────────────────────────────────────────────────┘\n```\n\n**Protocol:**\n\n1. Worker computes candidate list (deterministic ordering)\n2. Worker acquires flock on workspace lock file (blocking, with timeout)\n3. Worker verifies top candidate is still claimable\n4. Worker executes `br update <id> --claim --actor <worker-id>`\n5. Worker releases flock\n6. If claim failed (race with non-NEEDLE claimer), retry with next candidate\n\n**Lock file path:** `/tmp/needle-claim-{workspace_hash}.lock` where `workspace_hash` is a deterministic hash of the workspace absolute path.\n\n**Lock timeout:** 10 seconds. If the lock cannot be acquired within this time, the worker skips this workspace and moves to the next strand.\n\n**Lock scope:** The lock is held only during the claim attempt (steps 2-5), not during bead execution. This means the lock is held for milliseconds, not minutes.\n\n## Heartbeat Protocol\n\nEvery worker emits a heartbeat file to enable peer monitoring and stale claim detection.\n\n### Heartbeat File\n\n```\n~/.needle/state/heartbeats/<worker-id>.json\n```\n\nContents:\n\n```json\n{\n  \"worker_id\": \"needle-claude-anthropic-sonnet-alpha\",\n  \"pid\": 12345,\n  \"state\": \"EXECUTING\",\n  \"current_bead\": \"nd-a3f8\",\n  \"workspace\": \"/home/coder/project\",\n  \"last_heartbeat\": \"2026-03-20T15:30:00Z\",\n  \"started_at\": \"2026-03-20T14:00:00Z\",\n  \"beads_processed\": 7,\n  \"session\": \"needle-claude-anthropic-sonnet-alpha\"\n}\n```\n\n### Emission\n\n- Heartbeat is emitted every `heartbeat_interval` (default: 30 seconds)\n- Emitted from a dedicated thread/task, independent of the main worker loop\n- Updates `last_heartbeat` timestamp and `state` field\n- File write is atomic (write to temp file, rename)\n\n### TTL and Stale Detection\n\nA heartbeat is **stale** if `now - last_heartbeat > heartbeat_ttl` (default: 5 minutes).\n\nA stale heartbeat means the worker has stopped updating — it has crashed, hung, or been killed.\n\n### Peer Monitoring\n\nThe Mend strand (Strand 2) checks peer heartbeats:\n\n1. Read all heartbeat files in `~/.needle/state/heartbeats/`\n2. For each stale heartbeat:\n   a. Check if the PID is still alive (`kill -0 <pid>`)\n   b. If PID is dead: worker crashed. Clean up.\n   c. If PID is alive but heartbeat is stale: worker is stuck. Log warning.\n3. For crashed workers:\n   a. Release any claimed bead\n   b. Remove heartbeat file\n   c. Deregister from worker state registry\n   d. Emit `peer.crashed` telemetry\n\n## Worker State Registry\n\nA shared file tracks all active workers for fleet-level awareness.\n\n```\n~/.needle/state/workers.json\n```\n\nContents:\n\n```json\n{\n  \"workers\": [\n    {\n      \"id\": \"needle-claude-anthropic-sonnet-alpha\",\n      \"pid\": 12345,\n      \"workspace\": \"/home/coder/project\",\n      \"agent\": \"claude\",\n      \"model\": \"sonnet\",\n      \"started_at\": \"2026-03-20T14:00:00Z\",\n      \"beads_processed\": 7\n    }\n  ],\n  \"updated_at\": \"2026-03-20T15:30:00Z\"\n}\n```\n\n**Access pattern:**\n- Workers register on startup, deregister on shutdown\n- Registry is updated via flock-protected read-modify-write\n- Used by `needle list`, `needle status`, and fleet-level telemetry\n- Not used for coordination — heartbeats handle that\n\n## Concurrency Limits\n\n### Provider/Model Limits\n\nRate limiting prevents API throttling and controls cost:\n\n```yaml\nlimits:\n  launch_stagger_seconds: 2          # delay between worker launches\n  providers:\n    anthropic:\n      max_concurrent: 10             # max workers using Anthropic simultaneously\n      requests_per_minute: 60\n    openai:\n      max_concurrent: 5\n      requests_per_minute: 40\n  models:\n    claude-sonnet:\n      max_concurrent: 8\n    claude-opus:\n      max_concurrent: 3              # expensive model, limit concurrency\n```\n\n**Enforcement:**\n- Before dispatching to an agent, the worker checks the provider/model concurrency counters\n- If at limit, the worker waits with backoff (not the same as strand exhaustion — there is work, just rate limited)\n- Counters are maintained in the worker state registry\n- RPM limits are enforced via a token bucket per provider (stored in `~/.needle/state/rate_limits/`)\n\n### Fleet Sizing\n\nThe practical worker limit is not an arbitrary number. It is driven by three runtime constraints:\n\n1. **Provider inference throughput.** Each worker waiting on an LLM response is idle CPU but an active API slot. If the provider rate-limits or queues requests, adding workers produces no additional throughput. NEEDLE tracks RPM per provider and warns when request latency exceeds a threshold.\n\n2. **Available CPU.** Each agent process (Claude Code, OpenCode, etc.) consumes CPU during tool execution, file I/O, and git operations. NEEDLE's own overhead (strand evaluation, heartbeat I/O, lock contention) also scales with worker count. When system load exceeds a configurable threshold, NEEDLE emits a `fleet.cpu_saturated` warning.\n\n3. **Available RAM.** Each agent process holds context in memory. Agent processes with large context windows or many tool calls can consume significant RAM. NEEDLE monitors system memory and warns when free memory drops below a threshold.\n\n`max_workers` is a configurable ceiling, not a recommendation. The right value depends on the environment:\n\n```yaml\nworker:\n  max_workers: 0              # 0 = no hard ceiling, rely on runtime monitoring\n  cpu_load_warn: 0.8          # warn when system load average > 80% of cores\n  memory_free_warn_mb: 512    # warn when free memory < 512MB\n```\n\nIf `max_workers` is set, it is enforced at launch time. `needle run --count=25` with `max_workers: 20` will launch 20 and log a warning. If set to 0, NEEDLE launches the requested count and relies on runtime monitoring to signal saturation.\n\n## Race Condition Prevention\n\nLessons from `docs/notes/claim-race-conditions.md`, applied to the new design:\n\n| Race Condition | v1 Impact | v2 Prevention |\n|---------------|-----------|---------------|\n| **Thundering herd** | All workers claim same bead | Per-workspace flock serializes claims |\n| **TOCTOU on closed beads** | Worker claims bead that was just closed | Verify bead status inside flock before claiming |\n| **Stale claims from crashed workers** | Beads stuck `in_progress` forever | Heartbeat TTL + Mend strand auto-release |\n| **Lock file leaks** | Orphaned locks block claims | Lock TTL + Mend strand cleanup |\n| **Concurrent bead creation** | (Weave/Pulse/Unravel) create duplicates | Seen-issue deduplication + creation cooldowns |\n\n## Concurrency Invariants\n\n1. **One claim at a time per workspace.** The flock guarantees this. Two workers cannot execute `br update --claim` simultaneously in the same workspace.\n\n2. **One bead per worker.** A worker holds at most one claimed bead. It releases or verifies closure before claiming another.\n\n3. **Claims have a TTL.** If a worker holds a claim for longer than `heartbeat_ttl` without updating its heartbeat, the claim is considered stale and eligible for release by Mend.\n\n4. **No implicit locking.** Labels are not locks. Bead status is not a lock. Only flock and `br update --claim` provide mutual exclusion.\n\n5. **Lock scope is minimal.** The workspace flock is held for milliseconds (duration of the `br` CLI call), never for the duration of bead execution.\n\n---\n\n# Telemetry\n\nEvery state transition, claim attempt, dispatch, and outcome emits structured telemetry. A silent worker is a broken worker.\n\n## Telemetry Design Principles\n\n1. **Structured from origin.** Events are typed structs, not log strings. They are serialized to JSONL for storage and consumption. There is no string parsing.\n\n2. **Separate from agent output.** Telemetry is written to NEEDLE's own sinks. It is never interleaved with agent stdout/stderr. This eliminates the stdout corruption bug class from v1 (see `docs/notes/bash-at-scale-problems.md`).\n\n3. **Non-blocking.** Telemetry emission never blocks the worker loop. If a sink is slow or failing, events are buffered and dropped after a threshold, not retried.\n\n4. **Complete.** Every state transition produces an event. If you reconstruct events for a worker, you can replay its entire session.\n\n## Event Schema\n\nAll events share a common envelope:\n\n```json\n{\n  \"timestamp\": \"2026-03-20T15:30:00.123Z\",\n  \"event_type\": \"bead.claim.attempted\",\n  \"worker_id\": \"needle-claude-anthropic-sonnet-alpha\",\n  \"session_id\": \"a1b2c3d4\",\n  \"sequence\": 42,\n  \"bead_id\": \"nd-a3f8\",\n  \"workspace\": \"/home/coder/project\",\n  \"data\": { }\n}\n```\n\n| Field | Type | Description |\n|-------|------|-------------|\n| `timestamp` | ISO 8601 with milliseconds | When the event occurred |\n| `event_type` | Dotted string | Event classification |\n| `worker_id` | String | Unique worker identifier |\n| `session_id` | String | Unique session identifier (random per boot) |\n| `sequence` | u64 | Monotonically increasing per session (enables ordering) |\n| `bead_id` | String? | Bead ID if applicable |\n| `workspace` | Path? | Workspace path if applicable |\n| `data` | Object | Event-specific payload |\n\n## Event Catalog\n\n### Worker Lifecycle\n\n| Event Type | Emitted When | Data Fields |\n|------------|-------------|-------------|\n| `worker.started` | Worker boots successfully | `agent`, `model`, `config_hash`, `version` |\n| `worker.stopped` | Graceful shutdown | `beads_processed`, `uptime_seconds`, `reason` |\n| `worker.errored` | Unrecoverable error | `error_type`, `error_message`, `beads_processed` |\n| `worker.exhausted` | All strands empty | `cycle_count`, `last_strand_evaluated` |\n| `worker.idle` | Entering backoff after exhaustion | `backoff_seconds` |\n\n### Strand Evaluation\n\n| Event Type | Emitted When | Data Fields |\n|------------|-------------|-------------|\n| `strand.evaluated` | Strand returns a result | `strand_name`, `result` (`bead_found`, `work_created`, `no_work`, `error`), `duration_ms` |\n| `strand.skipped` | Strand is disabled | `strand_name`, `reason` |\n\n### Bead Operations\n\n| Event Type | Emitted When | Data Fields |\n|------------|-------------|-------------|\n| `bead.claim.attempted` | Claim attempt starts | `bead_id`, `retry_number` |\n| `bead.claim.succeeded` | Claim won | `bead_id`, `priority`, `title_hash` |\n| `bead.claim.race_lost` | Claim lost to another worker | `bead_id`, `claimed_by` |\n| `bead.claim.failed` | Claim failed (not race) | `bead_id`, `reason` |\n| `bead.released` | Bead released back to queue | `bead_id`, `reason` (`failure`, `timeout`, `crash`, `interrupted`) |\n| `bead.completed` | Bead closed by agent (detected) | `bead_id`, `duration_ms` |\n| `bead.orphaned` | Agent exited 0 but bead still open | `bead_id` |\n\n### Agent Dispatch\n\n| Event Type | Emitted When | Data Fields |\n|------------|-------------|-------------|\n| `agent.dispatched` | Agent process started | `agent_name`, `model`, `pid`, `prompt_hash`, `prompt_tokens_est` |\n| `agent.executing` | Periodic during execution | `pid`, `elapsed_ms`, `still_alive` |\n| `agent.completed` | Agent process exited | `exit_code`, `elapsed_ms`, `stdout_bytes`, `stderr_bytes` |\n| `agent.timeout` | Agent killed for timeout | `timeout_ms`, `pid` |\n\n### Outcome Handling\n\n| Event Type | Emitted When | Data Fields |\n|------------|-------------|-------------|\n| `outcome.classified` | Exit code mapped to outcome | `outcome` (`success`, `failure`, `timeout`, `crash`, `agent_not_found`, `interrupted`), `exit_code` |\n| `outcome.handled` | Handler executed | `outcome`, `action` (`released`, `deferred`, `alerted`, `none`) |\n\n### Health\n\n| Event Type | Emitted When | Data Fields |\n|------------|-------------|-------------|\n| `heartbeat.emitted` | Heartbeat file updated | `state`, `current_bead` |\n| `peer.stale` | Stale peer detected | `peer_id`, `last_seen`, `claimed_bead` |\n| `peer.crashed` | Dead peer cleaned up | `peer_id`, `released_bead` |\n| `health.check` | Periodic health check | `db_healthy`, `disk_free_mb`, `peer_count` |\n| `fleet.cpu_saturated` | System load exceeds threshold | `load_average` (f64), `threshold` (f64), `core_count` (usize) |\n| `fleet.memory_low` | Free memory below threshold | `free_mb` (u64), `threshold_mb` (u64) |\n\n### Effort Tracking\n\n| Event Type | Emitted When | Data Fields |\n|------------|-------------|-------------|\n| `effort.recorded` | After each bead processing cycle | `bead_id`, `elapsed_ms`, `agent_name`, `model`, `tokens_in`, `tokens_out`, `estimated_cost_usd` |\n\n## Sinks\n\nTelemetry events are dispatched to one or more sinks. Sinks are configured independently.\n\n### File Sink (default, always on)\n\nWrites JSONL to per-worker log files:\n\n```\n~/.needle/logs/<worker-id>.jsonl\n```\n\n- One line per event\n- File is append-only\n- Rotation: new file per session (session ID in filename) or size-based (configurable)\n\n### Stdout Sink (optional)\n\nWrites human-readable summary to stdout for interactive monitoring:\n\n```\n15:30:00 [alpha] CLAIMED nd-a3f8 (p1: \"Fix auth middleware\")\n15:30:02 [alpha] DISPATCHED claude-sonnet pid=12345\n15:32:15 [alpha] SUCCESS nd-a3f8 (135s, ~2400 tokens)\n15:32:15 [alpha] CLAIMED nd-b2c9 (p2: \"Add rate limiting tests\")\n```\n\n- Enabled when worker runs in foreground or via `needle attach`\n- Format is configurable: `minimal`, `normal`, `verbose`\n- Color-coded by event type\n\n### Hook Sink (optional)\n\nDispatches events to external systems via webhook or command:\n\n```yaml\ntelemetry:\n  hooks:\n    - event_filter: \"outcome.*\"\n      command: \"curl -X POST https://webhook.example.com/needle -d @-\"\n    - event_filter: \"worker.errored\"\n      command: \"/path/to/alert-script.sh\"\n    - event_filter: \"effort.recorded\"\n      command: \"/path/to/cost-tracker.sh\"\n```\n\n- Events matching the filter are piped as JSON to the command's stdin\n- Hook execution is fire-and-forget (non-blocking)\n- Failed hooks emit a `telemetry.hook.failed` event to the file sink (not recursively to hooks)\n\n### OTLP Sink (optional)\n\nExports telemetry as OpenTelemetry signals (traces, metrics, logs) over OTLP to any compliant collector (OpenTelemetry Collector, Jaeger, Tempo, Grafana Alloy, Honeycomb, Datadog, etc.). This is the canonical integration point for FABRIC and any downstream observability plane.\n\n```yaml\ntelemetry:\n  otlp:\n    enabled: true\n    endpoint: \"http://otel-collector.tailnet:4317\"    # gRPC default; use 4318 for HTTP\n    protocol: grpc                                     # grpc | http/protobuf\n    headers:\n      authorization: \"Bearer ${OTEL_TOKEN}\"            # env interpolation\n    timeout_ms: 5000\n    compression: gzip                                  # none | gzip\n    tls:\n      insecure: false\n      ca_file: \"\"\n    signals:\n      traces: true\n      metrics: true\n      logs: true\n    resource_attributes:\n      deployment.environment: \"production\"\n      service.namespace: \"needle-fleet\"\n```\n\nDesign:\n\n- **Non-blocking.** Uses a batch span/log/metric processor. If the collector is unreachable, events are buffered up to a bounded queue, then dropped (same policy as file sink). Drops emit a `telemetry.otlp.dropped` event to the file sink (never recursively to OTLP).\n- **Additive.** The file sink is authoritative. OTLP is an export, not a replacement. If OTLP is disabled or misconfigured, NEEDLE behaves identically to a file-sink-only deployment.\n- **Stdlib deps.** Rust crates: `opentelemetry`, `opentelemetry_sdk`, `opentelemetry-otlp`, `opentelemetry-semantic-conventions`. All support OTLP/gRPC and OTLP/HTTP.\n- **W3C trace context.** Trace and span IDs are generated per the W3C Trace Context spec so they interop with any OTel backend.\n- **Graceful shutdown.** On `worker.stopped`, the exporter is flushed with a deadline before process exit. Failure to flush is logged but never blocks shutdown.\n\n## OpenTelemetry Semantic Mapping\n\nNEEDLE's existing event catalog maps cleanly to OpenTelemetry's three signal types. This mapping is **normative** — the OTLP sink implementation must conform to it so dashboards and alerts remain stable across NEEDLE versions.\n\n### Resource Attributes\n\nEvery exported signal carries these resource attributes (per OTel semantic conventions):\n\n| Attribute | Value | Source |\n|-----------|-------|--------|\n| `service.name` | `\"needle\"` | Constant |\n| `service.version` | build version | `env!(\"CARGO_PKG_VERSION\")` |\n| `service.instance.id` | `<worker_id>` | e.g., `needle-claude-anthropic-sonnet-alpha` |\n| `service.namespace` | `\"needle-fleet\"` (default, configurable) | Config |\n| `deployment.environment` | e.g., `\"production\"` | Config |\n| `host.name` | hostname | OS |\n| `process.pid` | worker PID | OS |\n| `needle.agent` | e.g., `\"claude-anthropic-sonnet\"` | Worker config |\n| `needle.model` | e.g., `\"claude-sonnet-4-6\"` | Worker config |\n| `needle.session_id` | session ID | Per-boot random |\n| `needle.workspace` | workspace path | Worker config |\n\n### Traces\n\nThe NEEDLE state machine is naturally hierarchical, which maps directly to OTel spans.\n\n```\nworker.session                                          (root span, lifetime = worker process)\n├── strand.pluck                                        (one per strand evaluation)\n│   └── bead.lifecycle                                  (one per claimed bead)\n│       ├── bead.claim                                  (ATOMIC phase)\n│       ├── bead.prompt_build\n│       ├── agent.dispatch                              (DISPATCHING + EXECUTING)\n│       │   └── agent.execution                         (process alive; span.ok on exit 0)\n│       └── bead.outcome                                (HANDLING)\n│           └── bead.mitosis?                           (optional, if outcome = failure)\n├── strand.mend\n├── strand.explore\n├── strand.weave\n├── strand.unravel\n├── strand.pulse\n└── strand.knot                                         (terminal backoff / exhaustion)\n```\n\nSpan naming follows OpenTelemetry conventions: lowercase dotted, verb-form where appropriate.\n\n**Span attributes** follow OTel semantic conventions where applicable, plus a `needle.*` namespace:\n\n| Span | Key Attributes |\n|------|----------------|\n| `worker.session` | `needle.beads_processed`, `needle.uptime_seconds`, `needle.exit_reason` |\n| `strand.*` | `needle.strand.name`, `needle.strand.result`, `needle.strand.duration_ms` |\n| `bead.lifecycle` | `needle.bead.id`, `needle.bead.priority`, `needle.bead.title_hash`, `needle.bead.outcome` |\n| `bead.claim` | `needle.claim.retry_number`, `needle.claim.result` (`succeeded` / `race_lost` / `failed`) |\n| `agent.dispatch` | `gen_ai.system` (e.g., `anthropic`), `gen_ai.request.model`, `gen_ai.usage.input_tokens`, `gen_ai.usage.output_tokens`, `needle.agent.pid`, `needle.agent.exit_code` |\n| `bead.outcome` | `needle.outcome` (`success` / `failure` / `timeout` / `crash` / `agent_not_found` / `interrupted`), `needle.outcome.action` |\n\n**GenAI semantic conventions.** The `agent.dispatch` span uses OTel's `gen_ai.*` conventions so NEEDLE's token/cost data shows up in GenAI dashboards out-of-the-box (Grafana GenAI app, Langfuse, Honeycomb AI, etc.).\n\n**Span status.** Success outcomes set `Status::Ok`. All other outcomes set `Status::Error` with a description matching the `needle.outcome` value. This makes error-rate SLOs trivial.\n\n**Context propagation.** The trace ID from `worker.session` is recorded in the file-sink event envelope as a new optional field `trace_id`, enabling correlation between the JSONL file sink and the OTel backend without ambiguity.\n\n### Metrics\n\nMetrics are emitted via the OTel Meter API, one `Meter` per worker. All metrics are prefixed `needle.*`.\n\n| Metric | Instrument | Unit | Attributes | Description |\n|--------|-----------|------|------------|-------------|\n| `needle.workers.active` | UpDownCounter | `{worker}` | — | Current live worker count (incremented on `worker.started`, decremented on `worker.stopped`) |\n| `needle.beads.claimed` | Counter | `{bead}` | `strand`, `priority` | Successful bead claims |\n| `needle.beads.completed` | Counter | `{bead}` | `outcome` | Bead terminal outcomes (one per `bead.outcome`) |\n| `needle.beads.duration` | Histogram | `ms` | `outcome` | End-to-end bead lifecycle time |\n| `needle.claim.attempts` | Counter | `{attempt}` | `result` (`succeeded`/`race_lost`/`failed`) | Claim attempts |\n| `needle.strand.duration` | Histogram | `ms` | `strand`, `result` | Strand evaluation time |\n| `needle.agent.duration` | Histogram | `ms` | `agent`, `model`, `exit_code` | Agent process runtime |\n| `needle.agent.tokens.input` | Counter | `{token}` | `agent`, `model` | Input tokens consumed |\n| `needle.agent.tokens.output` | Counter | `{token}` | `agent`, `model` | Output tokens produced |\n| `needle.cost.usd` | Counter | `USD` | `agent`, `model` | Estimated cost accumulator |\n| `needle.heartbeat.age` | Gauge (observable) | `s` | `worker_id` | Seconds since last heartbeat emitted by this worker |\n| `needle.peers.stale` | UpDownCounter | `{peer}` | — | Currently-stale peers observed by this worker |\n| `needle.queue.depth` | Gauge (observable) | `{bead}` | `workspace`, `priority` | Open beads visible to this worker (sampled at strand evaluation) |\n| `needle.mitosis.children_created` | Counter | `{bead}` | `parent_id` | Mitosis child creations |\n| `needle.outcome.rate` | derived | — | — | Computed in the backend as `needle.beads.completed{outcome=\"success\"} / needle.beads.completed` |\n\nMetric aggregation temporality is **delta** (standard OTel default); backends that require cumulative (Prometheus via prometheusreceiver) convert upstream.\n\n### Logs\n\nEvery NEEDLE telemetry event that isn't already represented as a span event is exported as an OTel LogRecord with:\n\n- `severity_number` / `severity_text`: `INFO` for normal events, `WARN` for `peer.stale` / `telemetry.*.dropped`, `ERROR` for `worker.errored` / `bead.claim.failed` / `agent.timeout`.\n- `body`: the existing event `data` object.\n- `attributes`: flattened from the event envelope (`event_type`, `bead_id`, `workspace`, etc.).\n- `trace_id` / `span_id`: linked to the enclosing `bead.lifecycle` or `worker.session` span where applicable.\n\nEvents that ARE spans (e.g., `bead.claim.attempted` → a span, not a log) do not double-export as logs.\n\n### Span Events vs. Logs\n\nIntra-span state changes (e.g., `agent.executing` heartbeats, `heartbeat.emitted`) are recorded as OTel **span events** on the nearest enclosing span, not as separate logs. This keeps the signal count manageable and makes timelines in Tempo/Jaeger readable.\n\n## Token and Cost Tracking\n\n### Token Extraction\n\nNEEDLE attempts to extract token usage from agent output. This is agent-specific and best-effort:\n\n| Agent | Extraction Method |\n|-------|-------------------|\n| Claude Code | Parse `--output-format json` for `usage.input_tokens`, `usage.output_tokens` |\n| OpenCode | Parse structured output (TBD) |\n| Codex CLI | Parse structured output (TBD) |\n| Aider | Parse cost summary line from stderr |\n| Generic | No extraction; record elapsed time only |\n\nIf token extraction fails, the event is still emitted with `null` token fields. Missing tokens are not an error.\n\n### Cost Estimation\n\nCost is estimated from tokens using configurable per-model pricing:\n\n```yaml\npricing:\n  claude-sonnet:\n    input_per_million: 3.00\n    output_per_million: 15.00\n  claude-opus:\n    input_per_million: 15.00\n    output_per_million: 75.00\n  gpt-4:\n    input_per_million: 30.00\n    output_per_million: 60.00\n```\n\nCost is **estimated**, never authoritative. It is recorded in telemetry for trend analysis, not for billing.\n\n## Querying Telemetry\n\nNEEDLE includes built-in telemetry queries via the CLI:\n\n```bash\n# Summary of today's work\nneedle status\n\n# Per-worker breakdown\nneedle status --by-worker\n\n# Cost summary\nneedle status --cost --since 2026-03-20\n\n# Event stream (tail -f equivalent)\nneedle logs --follow\n\n# Filter by event type\nneedle logs --filter \"bead.claim.*\" --since 1h\n\n# Export for external analysis\nneedle logs --format jsonl --since 24h > export.jsonl\n```\n\n---\n\n# Self-Healing\n\nNEEDLE workers must detect and recover from failures without human intervention. This section specifies the failure modes, detection mechanisms, and recovery procedures.\n\n## Failure Taxonomy\n\n| Failure | Scope | Detection | Recovery |\n|---------|-------|-----------|----------|\n| Worker crash | Worker | Heartbeat TTL expiry | Peer cleanup via Mend |\n| Worker stuck | Worker | Heartbeat stale + PID alive | Alert via Knot |\n| Agent hang | Bead | Execution timeout | Kill process, release bead |\n| Stale claim | Bead | in_progress + no heartbeat | Mend releases bead |\n| Orphaned lock | Workspace | Lock file age > TTL | Mend removes lock |\n| Database corruption | Workspace | `br doctor` detects | Auto-repair from JSONL |\n| Stale dependency | Bead | Closed bead still blocks open bead | Mend cleans dependency |\n| Disk full | System | Write failure | Emit alert, graceful stop |\n| Bead store unreachable | System | `br` command fails | Retry with backoff, then stop |\n\n## Heartbeat-Based Detection\n\n```\nWorker A (alive)          Worker B (alive)         Worker C (crashed)\n┌──────────────┐         ┌──────────────┐         ┌──────────────┐\n│ heartbeat:   │         │ heartbeat:   │         │ heartbeat:   │\n│ 15:30:00     │         │ 15:30:10     │         │ 15:20:00     │ ← stale\n│ state: EXEC  │         │ state: SEL   │         │ state: EXEC  │\n│ bead: nd-a3f │         │ bead: null   │         │ bead: nd-x7y │ ← orphaned claim\n└──────────────┘         └──────────────┘         └──────────────┘\n\nWorker B runs Mend strand:\n  1. Reads all heartbeat files\n  2. Detects C's heartbeat is stale (10 min old, TTL is 5 min)\n  3. Checks PID: dead\n  4. Releases nd-x7y: br update nd-x7y --status open --unassign\n  5. Removes C's heartbeat file\n  6. Deregisters C from worker registry\n  7. Emits peer.crashed telemetry\n```\n\n### Detection Parameters\n\n| Parameter | Default | Description |\n|-----------|---------|-------------|\n| `heartbeat_interval` | 30s | How often a worker writes its heartbeat |\n| `heartbeat_ttl` | 5min | How long before a heartbeat is considered stale |\n| `peer_check_interval` | 60s | How often Mend checks peer heartbeats |\n\n**Relationship:** `heartbeat_ttl` should be at least `3 × heartbeat_interval` to tolerate transient delays.\n\n### Stuck vs. Crashed\n\n| Signal | Diagnosis | Action |\n|--------|-----------|--------|\n| Stale heartbeat + PID dead | **Crashed.** Worker terminated unexpectedly. | Release claim, clean up, emit `peer.crashed` |\n| Stale heartbeat + PID alive | **Stuck.** Worker is hung (deadlock, infinite loop, blocked I/O). | Emit `peer.stale` warning. Do NOT kill — may be legitimately slow. Alert via Knot after threshold. |\n| Fresh heartbeat + PID alive | **Healthy.** Normal operation. | No action. |\n\n**NEEDLE does not auto-kill stuck workers.** A stuck worker with a live PID may be executing a legitimately slow agent. Killing it would interrupt work. Instead, NEEDLE alerts via Knot and lets the human decide.\n\n## Database Recovery\n\nbeads_rust uses SQLite with a known corruption issue (FrankenSQLite, upstream #171). NEEDLE must handle this.\n\n### Recovery Procedure\n\n```\nCorruption detected\n       │\n       ▼\n  Run br doctor --repair\n       │\n       ├── Success ──► Resume operation, emit health.db_repaired\n       │\n       └── Failure ──► Full rebuild:\n                          1. rm .beads/beads.db\n                          2. br sync --import\n                          3. Verify: br doctor\n                          │\n                          ├── Success ──► Resume, emit health.db_rebuilt\n                          │\n                          └── Failure ──► ERRORED state (JSONL itself may be corrupt)\n```\n\n**Key insight from `docs/notes/mitosis-explosion-postmortem.md`:** The JSONL file is always the authoritative data source. It is append-only and immune to SQLite corruption. Recovery always rebuilds from JSONL.\n\n### Proactive Health Checks\n\nThe Mend strand runs `br doctor` (without `--repair`) periodically:\n- After every N beads processed (configurable, default: 50)\n- On every Mend strand evaluation\n- If doctor reports warnings, escalate to `--repair` immediately rather than waiting for failure\n\n## Stale Claim Recovery\n\n```\nMend strand evaluates:\n  1. Query beads with status=in_progress\n  2. For each:\n     a. Read assigned worker ID from bead\n     b. Check worker's heartbeat file\n     c. If heartbeat is stale AND PID is dead:\n        - br update <bead_id> --status open --unassign\n        - Emit bead.released telemetry (reason: stale_claim)\n     d. If heartbeat is stale AND PID is alive:\n        - Emit peer.stale warning (do not release — worker may be slow)\n     e. If heartbeat is fresh:\n        - Normal operation, skip\n```\n\nA claimed bead is only released if the owning worker is **confirmed dead** (stale heartbeat AND dead PID). If the PID is alive, the bead is not released, even if the heartbeat is stale.\n\n## Lock File Recovery\n\nMend strand checks lock file age:\n1. Read lock files in `/tmp/needle-claim-*.lock`\n2. If file modification time > `lock_ttl` (default: 10 minutes):\n   - Attempt to acquire flock (non-blocking)\n   - If acquired: no one holds it, delete the file, release flock\n   - If not acquired: someone is actively holding it, skip\n\n## Dependency Link Recovery\n\nMend strand checks for stale dependencies:\n1. Query beads with status `open` that have blockers\n2. For each blocker, check if the blocking bead is closed\n3. If blocker is closed, remove the dependency link\n4. Emit `bead.dependency.cleaned` telemetry\n\nThis is a necessary compensating mechanism because `br` does not automatically resolve dependency links on bead closure (documented in `docs/notes/bead-lifecycle-bugs.md`).\n\n## Graceful Degradation\n\nWhen subsystems fail, NEEDLE degrades gracefully rather than crashing:\n\n| Subsystem Failure | Degradation |\n|-------------------|-------------|\n| Telemetry file sink unwritable | Buffer events in memory, retry. If buffer full, drop events. Worker continues. |\n| Heartbeat file unwritable | Log error. Worker continues but cannot be monitored by peers. If persistent, ERRORED. |\n| Worker registry unwritable | Log error. Worker continues but invisible to `needle list`. |\n| Database corrupt | Auto-repair. If repair fails, ERRORED for that workspace only. |\n| Single workspace unreachable | Skip workspace in Explore, continue with others. |\n| Config file unreadable mid-session | Use cached config from boot. Emit warning. |\n\n## Self-Modification and Release Channels\n\nNEEDLE workers are allowed to modify NEEDLE itself. The v1 failures (see `docs/notes/self-modification-risks.md`) were not caused by self-modification as a concept — they were caused by untested changes deploying directly to the running fleet. The solution is not to ban self-modification but to gate promotion through release channels with canary testing.\n\n### Release Channels\n\n```\n:testing ──► :stable ──► fleet hot-reload\n                │\n                └── rollback to previous :stable on failure\n```\n\nThree channels:\n\n| Channel | Purpose | Who writes | Who reads |\n|---------|---------|------------|-----------|\n| `:testing` | Newly built binary, not yet validated | Worker that built it | Canary test harness only |\n| `:stable` | Validated binary, approved for fleet use | Promotion pipeline (after canary passes) | Running fleet via hot-reload |\n| `:latest` | Alias for the most recent `:stable` | Automatic on promotion | `needle upgrade` default target |\n\n### Canary Testing Pipeline\n\nWhen a worker modifies NEEDLE's source and builds a new binary:\n\n```\nWorker builds new binary\n       │\n       ▼\n  Install as :testing\n  (~/.needle/bin/needle-testing)\n       │\n       ▼\n  Run canary test suite:\n    1. Launch :testing binary with test .beads/ directory\n    2. Test beads have defined inputs and expected outcomes\n    3. :testing processes beads in isolation\n    4. Compare actual outcomes against expected\n       │\n       ├── All pass → Promote :testing to :stable\n       │                 │\n       │                 ▼\n       │              Fleet detects new :stable\n       │              Workers hot-reload on next bead boundary\n       │\n       └── Any fail → Reject :testing\n                        │\n                        ▼\n                     Mark bead as failed\n                     :stable remains unchanged\n                     Fleet continues on previous :stable\n                     Emit canary.failed telemetry\n```\n\n### Canary Test Suite\n\nThe canary suite is a set of test beads with known-good outcomes stored in a dedicated test workspace:\n\n```\n~/.needle/canary/\n├── .beads/                    # test bead store\n│   ├── issues.jsonl\n│   └── beads.db\n├── test-workspace/            # mock workspace with source files\n│   ├── src/\n│   │   └── hello.py           # simple file for beads to modify\n│   └── .beads/\n└── expected/                  # expected outcomes per bead\n    ├── bead-001.expected.json # { \"exit_code\": 0, \"bead_closed\": true }\n    ├── bead-002.expected.json # { \"exit_code\": 0, \"files_modified\": [\"src/hello.py\"] }\n    └── bead-003.expected.json # { \"exit_code\": 1, \"bead_closed\": false }\n```\n\nTest beads cover:\n- **Happy path:** Simple bead that should succeed and close\n- **Failure path:** Bead that should fail (tests outcome handling)\n- **Timeout path:** Bead with intentionally slow agent (tests timeout enforcement)\n- **State machine integrity:** Verify telemetry events match expected state transitions\n- **Mitosis:** Multi-task bead that should split on failure\n\n### Hot-Reload Protocol\n\nRunning workers check for a new `:stable` binary between bead processing cycles (after LOGGING, before SELECTING):\n\n1. Compare current binary hash against `:stable` binary hash\n2. If different:\n   a. Emit `worker.upgrade.detected` telemetry\n   b. Complete current bead cycle (never interrupt mid-execution)\n   c. Re-exec with the new binary: `exec ~/.needle/bin/needle-stable run --resume`\n   d. New binary picks up worker state from heartbeat file and registry\n3. If same: continue normally\n\n**`--resume` flag:** Tells the new binary to inherit the worker's identity (ID, session, tmux) rather than creating a new session. The worker continues from the SELECTING state with a fresh binary.\n\n### Rollback\n\nIf a promoted `:stable` causes failures in the fleet:\n\n1. Fleet workers emit `worker.errored` or repeated `outcome.failure` telemetry\n2. Human (or automated watchdog) runs: `needle rollback`\n3. Rollback restores the previous `:stable` from backup (`~/.needle/bin/needle-stable.prev`)\n4. Workers hot-reload to the rolled-back binary on next cycle\n\nRollback is always available because promotion preserves the previous `:stable` as a backup.\n\n### Binary Paths\n\n```\n~/.needle/bin/\n├── needle-testing             # candidate under canary evaluation\n├── needle-stable              # current fleet binary\n├── needle-stable.prev         # previous stable (rollback target)\n└── needle                     # symlink → needle-stable\n```\n\n### Configuration\n\n```yaml\nself_modification:\n  enabled: true                     # allow workers to process NEEDLE beads\n  canary_workspace: ~/.needle/canary  # test workspace with known-good beads\n  auto_promote: true                # promote to :stable automatically if canary passes\n  hot_reload: true                  # fleet hot-reloads from :stable between beads\n```\n\n### Telemetry\n\n| Event Type | Emitted When | Data Fields |\n|------------|-------------|-------------|\n| `canary.started` | Canary test suite begins | `testing_binary_hash`, `test_count` |\n| `canary.passed` | All canary tests passed | `testing_binary_hash`, `duration_ms` |\n| `canary.failed` | One or more canary tests failed | `testing_binary_hash`, `failures` (list) |\n| `promotion.completed` | :testing promoted to :stable | `old_hash`, `new_hash` |\n| `worker.upgrade.detected` | Worker sees new :stable | `old_hash`, `new_hash` |\n| `worker.upgrade.completed` | Worker re-exec'd with new binary | `new_hash` |\n| `rollback.completed` | :stable rolled back to previous | `rolled_back_hash`, `restored_hash` |\n\n---\n\n# Configuration\n\nNEEDLE uses a hierarchical configuration system. Values are resolved from highest to lowest precedence, with the first defined value winning.\n\n## Precedence Order\n\n```\nCLI arguments          (highest — overrides everything)\n       │\nEnvironment variables\n       │\nWorkspace config       (.needle.yaml in workspace root)\n       │\nGlobal config          (~/.needle/config.yaml)\n       │\nBuilt-in defaults      (lowest — always present)\n```\n\n**Rule:** A value set at a higher level completely replaces the lower level's value. There is no deep merging. For maps (like `strands`), the entire map is replaced, not merged key-by-key.\n\n**Exception:** The `workspaces` list in Explore strand config is additive — workspace configs can add to the global list but not remove from it.\n\n## Global Configuration\n\n**Location:** `~/.needle/config.yaml`\n\n```yaml\n# ── Agent Configuration ──\nagent:\n  default: claude-anthropic-sonnet\n  timeout: 600\n  adapters_dir: ~/.needle/agents\n\n# ── Worker Configuration ──\nworker:\n  max_workers: 0                      # 0 = no hard ceiling, rely on runtime monitoring\n  launch_stagger_seconds: 2\n  idle_timeout: 300\n  idle_action: wait\n  max_claim_retries: 5\n  identifier_scheme: nato\n  cpu_load_warn: 0.8                  # warn when load > 80% of cores\n  memory_free_warn_mb: 512            # warn when free RAM < 512MB\n\n# ── Workspace Configuration ──\nworkspace:\n  default: ~/projects/main\n  home: ~/projects/main\n\n# ── Strand Configuration ──\nstrands:\n  pluck:\n    enabled: true\n    exclude_labels: [deferred, human, blocked]\n  explore:\n    enabled: true\n    workspaces:\n      - ~/projects/api-server\n      - ~/projects/frontend\n  mend:\n    enabled: true\n    stale_claim_ttl: 300\n    lock_ttl: 600\n    db_check_interval: 50\n  weave:\n    enabled: false\n    max_beads_per_run: 5\n    cooldown_hours: 24\n    exclude_workspaces: []\n  unravel:\n    enabled: false\n    max_per_run: 3\n    cooldown_days: 7\n  pulse:\n    enabled: false\n    max_beads_per_run: 10\n    cooldown_hours: 48\n    severity_threshold: warning\n    scanners: []\n  knot:\n    enabled: true\n    alert_cooldown_minutes: 60\n    exhaustion_threshold: 3\n\n# ── Concurrency Limits ──\nlimits:\n  providers:\n    anthropic:\n      max_concurrent: 10\n      requests_per_minute: 60\n    openai:\n      max_concurrent: 5\n      requests_per_minute: 40\n  models: {}\n\n# ── Health Monitoring ──\nhealth:\n  heartbeat_interval: 30\n  heartbeat_ttl: 300\n  peer_check_interval: 60\n\n# ── Telemetry ──\ntelemetry:\n  file_sink:\n    enabled: true\n    directory: ~/.needle/logs\n    rotation: session\n    retention_days: 30\n  stdout_sink:\n    enabled: false\n    format: normal\n    color: auto\n  hooks: []\n  otlp:\n    enabled: false\n    endpoint: \"http://localhost:4317\"\n    protocol: grpc              # grpc | http/protobuf\n    headers: {}                 # e.g., authorization: \"Bearer ${OTEL_TOKEN}\"\n    timeout_ms: 5000\n    compression: gzip           # none | gzip\n    tls:\n      insecure: false\n      ca_file: \"\"\n    signals:\n      traces: true\n      metrics: true\n      logs: true\n    resource_attributes:\n      deployment.environment: \"development\"\n      service.namespace: \"needle-fleet\"\n\n# ── Cost Tracking ──\npricing: {}\nbudget:\n  warn_usd: 0\n  stop_usd: 0\n\n# ── Self-Modification & Release Channels ──\nself_modification:\n  enabled: true\n  canary_workspace: ~/.needle/canary\n  auto_promote: true\n  hot_reload: true\n```\n\n## Workspace Configuration\n\n**Location:** `.needle.yaml` in workspace root (next to `.beads/`)\n\nWorkspace-level configuration overrides global settings for that specific workspace. Only a subset of settings can be overridden at the workspace level.\n\n```yaml\nagent:\n  default: claude-anthropic-opus\n  timeout: 1200\n\nstrands:\n  weave:\n    enabled: true\n    max_beads_per_run: 3\n  pulse:\n    enabled: true\n    scanners:\n      - name: rust-clippy\n        command: \"cargo clippy --message-format=json 2>/dev/null\"\n\nprompt:\n  context_files:\n    - AGENTS.md\n    - docs/architecture.md\n  instructions: |\n    This workspace uses the repository pattern.\n    All database access must go through src/repository/.\n    Run `cargo test` before closing the bead.\n```\n\n### Overridable Settings\n\n| Setting | Workspace Override | Why |\n|---------|-------------------|-----|\n| `agent.default` | Yes | Different projects may need different models |\n| `agent.timeout` | Yes | Complex projects may need longer timeouts |\n| `strands.weave` | Yes | Some projects want gap analysis, others don't |\n| `strands.pulse` | Yes | Scanners are project-specific |\n| `strands.unravel` | Yes | Per-project opt-in |\n| `prompt.*` | Yes | Project-specific context and instructions |\n| `worker.*` | **No** | Worker config is fleet-level, not per-workspace |\n| `limits.*` | **No** | Rate limits are provider-level, not per-workspace |\n| `health.*` | **No** | Health monitoring is fleet-level |\n| `telemetry.*` | **No** | Telemetry config is fleet-level |\n\n## Environment Variables\n\nAll configuration keys can be overridden via environment variables with the `NEEDLE_` prefix. Nested keys use `__` (double underscore) as separator.\n\n| Config Key | Environment Variable |\n|------------|---------------------|\n| `agent.default` | `NEEDLE_AGENT__DEFAULT` |\n| `agent.timeout` | `NEEDLE_AGENT__TIMEOUT` |\n| `worker.max_workers` | `NEEDLE_WORKER__MAX_WORKERS` |\n| `strands.weave.enabled` | `NEEDLE_STRANDS__WEAVE__ENABLED` |\n\n## Configuration Validation\n\nConfiguration is validated at boot time. Invalid configuration causes the worker to enter ERRORED state immediately.\n\n### Required Fields\n\n- `agent.default` must reference a valid adapter (built-in or file exists in adapters dir)\n- `workspace.default` or `--workspace` must be a directory containing `.beads/`\n- Numeric fields must be positive\n- Duration fields must be > 0\n\n### Warnings (non-fatal)\n\n- `worker.max_workers` > 0 and > CPU count (consider runtime monitoring instead)\n- `health.heartbeat_ttl` < `3 * health.heartbeat_interval` (detection may be unreliable)\n- `strands.explore.workspaces` contains paths that don't exist\n- No pricing configured when `telemetry.effort.track_cost: true`\n\n### Config Dump\n\n```bash\nneedle config --dump\nneedle config --dump --show-source\n\n# Example output:\n# agent.default: claude-anthropic-sonnet (from: ~/.needle/config.yaml)\n# agent.timeout: 1200 (from: /home/coder/project/.needle.yaml)\n# worker.max_workers: 20 (from: NEEDLE_WORKER__MAX_WORKERS env var)\n# worker.idle_timeout: 300 (from: built-in default)\n```\n\n---\n\n# Agent Adapters\n\nNEEDLE is agent-agnostic. It wraps any headless CLI that accepts a prompt and exits. The adapter system is the abstraction layer that makes this possible.\n\nNEEDLE does not know how agents work. It knows how to:\n1. Render an invoke template with variables\n2. Pipe a prompt via the configured input method\n3. Wait for the process to exit\n4. Capture exit code, stdout, and stderr\n\nEverything else — authentication, model selection, context handling, tool use — is the agent's responsibility.\n\n## Adapter Interface\n\nAn adapter is a YAML file that describes how to invoke a specific agent:\n\n```yaml\nname: claude-anthropic-sonnet\ndescription: Claude Code with Anthropic Sonnet model\nagent_cli: claude\nversion_command: \"claude --version\"\ninput_method: stdin                   # stdin | file | args\ninvoke_template: >\n  cd {workspace} &&\n  claude --print\n  --model claude-sonnet-4-6\n  --max-turns 30\n  --output-format json\n  < {prompt_file}\nenvironment:\n  CLAUDE_CODE_MAX_TURNS: \"30\"\ntoken_extraction:\n  method: json_field                  # json_field | regex | none\n  input_path: \"usage.input_tokens\"\n  output_path: \"usage.output_tokens\"\nprovider: anthropic\nmodel: claude-sonnet-4-6\n```\n\n## Input Methods\n\n### stdin\n\nPrompt is piped to the agent's stdin. Most common for Claude Code. NEEDLE writes the prompt to a temp file (`{prompt_file}`) and redirects it to stdin to avoid shell escaping issues.\n\n### file\n\nPrompt is written to a file and the file path is passed as an argument.\n\n### args\n\nPrompt is passed as a command-line argument. `{prompt_escaped}` is the prompt with shell metacharacters escaped. For long prompts, NEEDLE may fall back to file-based input.\n\n## Template Variables\n\n| Variable | Description | Example |\n|----------|-------------|---------|\n| `{workspace}` | Absolute path to workspace | `/home/coder/project` |\n| `{prompt_file}` | Path to temp file containing the prompt | `/tmp/needle-prompt-a1b2.txt` |\n| `{prompt_escaped}` | Shell-escaped prompt string | `Fix the auth bug in src/auth.rs` |\n| `{bead_id}` | Current bead ID | `nd-a3f8` |\n| `{model}` | Model identifier from adapter config | `claude-sonnet-4-6` |\n| `{worker_id}` | Worker identifier | `needle-claude-anthropic-sonnet-alpha` |\n| `{timeout}` | Timeout in seconds | `600` |\n\n## Built-in Adapters\n\nNEEDLE ships with adapters for common agents, embedded in the binary. These can be overridden by placing a file with the same name in `~/.needle/agents/`.\n\n### Claude Code (Sonnet)\n\n```yaml\nname: claude-anthropic-sonnet\nagent_cli: claude\ninput_method: stdin\ninvoke_template: >\n  cd {workspace} && claude --print --model claude-sonnet-4-6\n  --max-turns 30 --output-format json --verbose < {prompt_file}\ntoken_extraction:\n  method: json_field\n  input_path: \"result.usage.input_tokens\"\n  output_path: \"result.usage.output_tokens\"\nprovider: anthropic\nmodel: claude-sonnet-4-6\n```\n\n### Claude Code (Opus)\n\n```yaml\nname: claude-anthropic-opus\nagent_cli: claude\ninput_method: stdin\ninvoke_template: >\n  cd {workspace} && claude --print --model claude-opus-4-6\n  --max-turns 50 --output-format json --verbose < {prompt_file}\ntoken_extraction:\n  method: json_field\n  input_path: \"result.usage.input_tokens\"\n  output_path: \"result.usage.output_tokens\"\nprovider: anthropic\nmodel: claude-opus-4-6\n```\n\n### OpenCode\n\n```yaml\nname: opencode-default\nagent_cli: opencode\ninput_method: file\ninvoke_template: >\n  cd {workspace} && opencode run --prompt-file {prompt_file} --non-interactive\ntoken_extraction:\n  method: none\nprovider: configurable\nmodel: configurable\n```\n\n### Codex CLI\n\n```yaml\nname: codex-openai-gpt4\nagent_cli: codex\ninput_method: args\ninvoke_template: >\n  cd {workspace} && codex --model gpt-4 --approval-mode full-auto \"{prompt_escaped}\"\ntoken_extraction:\n  method: none\nprovider: openai\nmodel: gpt-4\n```\n\n### Aider\n\n```yaml\nname: aider-anthropic-sonnet\nagent_cli: aider\ninput_method: args\ninvoke_template: >\n  cd {workspace} && aider --model claude-sonnet-4-6 --yes --message \"{prompt_escaped}\"\ntoken_extraction:\n  method: regex\n  pattern: \"Tokens: ([\\\\d,]+) sent, ([\\\\d,]+) received\"\n  input_group: 1\n  output_group: 2\nprovider: anthropic\nmodel: claude-sonnet-4-6\n```\n\n## Prompt Templates\n\nPrompts are configurable at both the global and workspace level. Every agent-invoking operation (Pluck execution, Weave gap analysis, Unravel alternatives, Pulse scanning, Mitosis splitting) uses a named prompt template. Templates are deterministic functions of their inputs — same bead state produces the same prompt.\n\n### Template Variables\n\nAll templates have access to these variables:\n\n| Variable | Available In | Description |\n|----------|-------------|-------------|\n| `{bead_id}` | All | Current bead ID |\n| `{bead_title}` | All | Bead title |\n| `{bead_body}` | All | Bead body/description |\n| `{workspace_path}` | All | Absolute path to workspace |\n| `{context_file_contents}` | All | Contents of configured context files |\n| `{workspace_instructions}` | All | Instructions from `.needle.yaml` |\n| `{worker_id}` | All | Worker identifier |\n| `{existing_children}` | Mitosis | Parent's current children (titles + IDs) |\n| `{human_bead_context}` | Unravel | The HUMAN-blocked bead being analyzed |\n| `{scan_results}` | Pulse | Output from configured scanners |\n| `{doc_files}` | Weave | Documentation file listing and contents |\n\n### Built-in Templates\n\n**`pluck` — Bead execution (default):**\n\n```markdown\n## Task\n\n{bead_title}\n\n## Description\n\n{bead_body}\n\n## Workspace\n\n{workspace_path}\n\n## Context Files\n\n{context_file_contents}\n\n## Instructions\n\n{workspace_instructions}\n\nComplete the task described above. When finished:\n- Commit your changes with a descriptive message\n- Close the bead: `br close {bead_id} --body \"Summary of what was done\"`\n\nIf you cannot complete the task:\n- Do NOT close the bead\n- The bead will be automatically released for retry\n\nBead ID: {bead_id}\n```\n\n**`mitosis` — Split analysis:**\n\n```markdown\n## Bead Analysis\n\nTitle: {bead_title}\nBody: {bead_body}\n\n## Existing Children\n\n{existing_children}\n\n## Question\n\nDoes this bead describe more than one independent task? A task is independent\nif it produces a distinct deliverable and could be completed without completing\nthe other tasks in this bead.\n\nIf yes, list each independent task as a structured child bead with:\n- title: concise task description\n- body: what needs to be done\n- dependencies: which other children must complete first (by title)\n\nIf this bead describes a single task (even a complex one), respond with: SINGLE_TASK\n\nDo not propose children that duplicate any existing children listed above.\n```\n\n**`weave` — Gap analysis:**\n\n```markdown\n## Workspace Documentation\n\n{doc_files}\n\n## Current Open Beads\n\n{existing_beads}\n\n## Question\n\nReview the documentation above. Identify gaps where documented features,\nAPIs, or workflows are incomplete, missing tests, or have no corresponding\nimplementation bead.\n\nFor each gap found, propose a bead with:\n- title: concise description of what's missing\n- body: what needs to be done to close the gap\n- priority: 1 (critical), 2 (important), or 3 (nice-to-have)\n\nDo not propose beads that duplicate any existing open beads listed above.\nIf no gaps are found, respond with: NO_GAPS\n```\n\n**`unravel` — Alternative proposals:**\n\n```markdown\n## Blocked Bead\n\nTitle: {bead_title}\nBody: {bead_body}\nStatus: Blocked (requires human decision)\n\n## Question\n\nThis bead is blocked because it requires a human decision. Analyze the bead\nand propose alternative approaches that could be executed by an automated\nagent without the human decision.\n\nFor each alternative, provide:\n- title: concise description of the alternative approach\n- body: what would be done differently\n- tradeoffs: what is gained and what is lost compared to the original approach\n\nIf no viable alternatives exist, respond with: NO_ALTERNATIVES\n```\n\n**`pulse` — Health scan bead creation:**\n\n```markdown\n## Scan Results\n\n{scan_results}\n\n## Current Open Beads\n\n{existing_beads}\n\n## Question\n\nReview the scan results above. For issues that are significant enough to\nwarrant a fix, propose a bead with:\n- title: concise description of the issue\n- body: what needs to be fixed and how\n- priority: based on severity (1=critical, 2=important, 3=minor)\n\nDo not propose beads that duplicate any existing open beads listed above.\nIf no significant issues are found, respond with: NO_ISSUES\n```\n\n### Overriding Templates\n\nTemplates are overridable at the workspace level in `.needle.yaml`:\n\n```yaml\nprompt:\n  context_files:\n    - CLAUDE.md\n    - AGENTS.md\n  instructions: |\n    This workspace uses the repository pattern.\n    Run `cargo test` before closing the bead.\n\n  templates:\n    pluck: |\n      {bead_title}\n\n      {bead_body}\n\n      Workspace: {workspace_path}\n      {context_file_contents}\n      {workspace_instructions}\n\n      Close when done: br close {bead_id} --body \"summary\"\n      Bead ID: {bead_id}\n\n    mitosis: |\n      ... custom mitosis prompt ...\n```\n\nIf a template is not overridden at the workspace level, the built-in default is used. Templates can also be overridden globally in `~/.needle/config.yaml` under `prompt.templates`.\n\n### Agent-Owned Closure\n\nThe pluck template instructs the agent to close the bead via `br close`. NEEDLE does not close beads itself. This is a deliberate design decision based on v1 experience:\n\n- The agent knows whether the work is actually done\n- NEEDLE's post-dispatch parsing of agent output was fragile\n- Exit code 0 does not guarantee the work was completed correctly\n- The agent can include a meaningful closure message\n\n## Adapter Validation\n\n```bash\nneedle test-agent claude-anthropic-sonnet\n\n# Output:\n#   Adapter: claude-anthropic-sonnet\n#   CLI:     claude (found at /home/coder/.local/bin/claude)\n#   Version: Claude Code v1.0.30\n#   Input:   stdin\n#   Probe:   echo hello → exit 0 (1.2s)\n#   Tokens:  extraction working (in: 45, out: 12)\n#   Status:  READY\n```\n\n## Adding a Custom Agent\n\n1. Create a YAML file in `~/.needle/agents/`\n2. Edit the file with the agent's invocation details\n3. Test the adapter: `needle test-agent my-agent`\n4. Use it: `needle run --agent my-agent`\n\nNo code changes required. No recompilation. No restart of other workers.\n\n---\n\n# Implementation Phases\n\nNEEDLE is built in three phases. Each phase produces a usable tool. No phase depends on future phases — Phase 1 alone is a complete, working system.\n\n## Phase 1: Core State Machine\n\n**Goal:** A single binary that processes beads from one workspace using one agent. The state machine is complete. Telemetry is complete. The tool works end-to-end.\n\n### Deliverables\n\n| Component | Scope |\n|-----------|-------|\n| **CLI** | `needle run`, `needle stop`, `needle list`, `needle version` |\n| **Worker** | Full state machine: BOOTING → SELECTING → CLAIMING → BUILDING → DISPATCHING → EXECUTING → HANDLING → LOGGING → (loop) |\n| **Strand 1 (Pluck)** | Query, filter, sort beads from single workspace |\n| **Strand 7 (Knot)** | Basic exhaustion handling (backoff, exit) |\n| **Claimer** | Atomic claim via `br update --claim`, single workspace flock |\n| **PromptBuilder** | Deterministic prompt from bead context |\n| **Dispatcher** | Agent adapter loading, process execution, timeout enforcement |\n| **OutcomeHandler** | All 6 outcomes handled (success, failure, timeout, crash, agent_not_found, interrupted) |\n| **Telemetry** | File sink (JSONL), all events in catalog |\n| **Config** | Global config file, CLI argument overrides |\n| **Agent adapters** | Claude Code built-in, generic template |\n| **BeadStore** | `br` CLI wrapper with JSON parsing |\n| **Types** | All enums (State, Outcome, ClaimResult, StrandResult) with exhaustive matching |\n| **tmux** | Session creation, naming, `needle run` self-invokes into tmux |\n\n### Not in Phase 1\n\n- Multi-worker coordination (flock is present but only one worker)\n- Strands 2-6\n- Heartbeat system\n- Peer monitoring\n- Workspace config (.needle.yaml)\n- Multiple agent adapters\n- Cost tracking\n- Budget enforcement\n- OTLP sink (Phase 2; Phase 1 ships JSONL file sink only)\n- `needle attach`, `needle status`, `needle config`\n\n### Success Criteria\n\n- [ ] `needle run --workspace /path --agent claude-anthropic-sonnet` launches a worker in tmux\n- [ ] Worker claims a bead, dispatches to Claude Code, handles outcome\n- [ ] All 6 outcome paths tested with mock agent (exit 0, 1, 124, 127, 130, timeout)\n- [ ] Telemetry JSONL file contains events for every state transition\n- [ ] `needle list` shows running workers\n- [ ] `needle stop` gracefully stops a worker (releases claimed bead)\n- [ ] Worker loops: after handling one bead, it selects the next\n- [ ] Worker exhausts: when no beads remain, enters backoff and eventually exits\n- [ ] Binary compiles for Linux x86_64 and macOS arm64\n\n### Estimated Scope\n\n~15 source files, ~3,000 LOC (Rust).\n\n## Phase 2: Multi-Worker Fleet\n\n**Goal:** Multiple workers operate in the same environment. They coordinate through shared state, detect failures, and self-heal. Workers roam across workspaces.\n\n### Deliverables\n\n| Component | Scope |\n|-----------|-------|\n| **Multi-worker launch** | `needle run --count N` with staggered startup |\n| **Workspace flock** | Per-workspace claim serialization |\n| **Heartbeat** | File-based heartbeat emission and monitoring |\n| **Peer monitoring** | Stale/crashed worker detection |\n| **Strand 2 (Mend)** | Stale claim cleanup, orphaned locks, dependency repair, db health |\n| **Strand 3 (Explore)** | Roam configured workspaces for work |\n| **Worker state registry** | Shared fleet state file |\n| **Concurrency limits** | Provider/model max_concurrent, RPM limiting |\n| **Workspace config** | `.needle.yaml` per-workspace overrides |\n| **Additional adapters** | OpenCode, Codex, Aider built-in |\n| **Cost tracking** | Token extraction, pricing config, effort events |\n| **Budget enforcement** | Warn/stop at daily cost thresholds |\n| **CLI extensions** | `needle attach`, `needle status`, `needle config` |\n| **Database recovery** | Auto-detect corruption, repair from JSONL |\n| **Mitosis** | Child-aware bead splitting on first failure, with dedup and flock serialization |\n| **OTLP sink** | OpenTelemetry exporter emitting traces, metrics, and logs per the semantic mapping in the Telemetry chapter. gRPC + HTTP/protobuf transports. Non-blocking batch processor. Graceful shutdown flush. |\n\n### Success Criteria\n\n- [ ] `needle run --count 5` launches 5 workers with staggered startup\n- [ ] Workers claim different beads (no thundering herd — verify via telemetry)\n- [ ] Crashed worker's claimed bead is released by peer within heartbeat_ttl\n- [ ] Workers discover work in other configured workspaces (Explore strand)\n- [ ] Mend strand cleans stale claims and orphaned locks\n- [ ] Provider concurrency limits enforced (>N workers for same provider wait)\n- [ ] `needle status` shows fleet summary with per-worker and per-bead stats\n- [ ] `needle attach alpha` connects to a running worker's tmux session\n- [ ] Cost tracking produces accurate estimates (±20% of actual)\n- [ ] Database corruption is detected and auto-repaired\n- [ ] Workspace `.needle.yaml` overrides global config correctly\n- [ ] Mitosis splits multi-task beads into children on first failure\n- [ ] Duplicate mitosis on same parent creates no new children (child-aware dedup verified)\n- [ ] With OTLP sink enabled against a local OpenTelemetry Collector, NEEDLE exports: a `worker.session` span per worker, `bead.lifecycle` child spans with `gen_ai.*` attributes, and `needle.beads.completed` / `needle.cost.usd` metrics\n- [ ] OTLP collector unreachable does not block or crash workers (drops are recorded via `telemetry.otlp.dropped` in the file sink)\n- [ ] `trace_id` in JSONL file-sink events matches the corresponding span in the OTel backend\n\n### Estimated Scope\n\n~10 additional source files, ~4,000 additional LOC.\n\n## Phase 3: Advanced Strands and Operations\n\n**Goal:** NEEDLE can create work (not just process it), monitor codebase health, and integrate with external systems. Full operational tooling.\n\n### Deliverables\n\n| Component | Scope |\n|-----------|-------|\n| **Strand 4 (Weave)** | Gap analysis, bead creation from documentation |\n| **Strand 5 (Unravel)** | Alternative proposals for HUMAN-blocked beads |\n| **Strand 6 (Pulse)** | Codebase health scans, auto-bead creation |\n| **Validation gates** | Pluggable pre-closure validation (inspired by bg-gate) |\n| **Hook sink** | Telemetry dispatch to webhooks/commands |\n| **Release channels** | :testing → :stable promotion with canary test suite, fleet hot-reload, rollback |\n| **Self-update** | `needle upgrade` with version checking |\n| **Doctor command** | `needle doctor` for full system health check |\n| **Telemetry queries** | `needle logs --filter`, `needle status --cost` |\n| **Installer** | One-liner install script, GitHub releases |\n\n### Success Criteria\n\n- [ ] Weave strand creates valid beads from documentation gaps (with guardrails)\n- [ ] Unravel strand proposes alternatives for HUMAN beads without modifying originals\n- [ ] Pulse strand detects codebase issues and creates beads (with deduplication)\n- [ ] All opt-in strands respect cooldowns and max-bead limits\n- [ ] Validation gates block bead closure when tests fail\n- [ ] Hook sink delivers events to configured webhooks\n- [ ] `needle upgrade` downloads and installs new version\n- [ ] `needle doctor` reports system health across all subsystems\n- [ ] One-liner install works on Linux and macOS\n- [ ] Worker modifies NEEDLE source → builds :testing → canary passes → promoted to :stable → fleet hot-reloads\n- [ ] Canary failure rejects :testing, fleet continues on previous :stable\n- [ ] `needle rollback` restores previous :stable and fleet hot-reloads\n\n### Estimated Scope\n\n~10 additional source files, ~4,000 additional LOC.\n\n## Migration from v1\n\nNEEDLE v2 is a clean rewrite. There is no in-place upgrade path from v1.\n\n### Migration Steps\n\n1. Stop all v1 workers: `needle stop --all` (v1)\n2. Back up v1 config: `cp -r ~/.needle ~/.needle-v1-backup`\n3. Install v2 binary (overwrites v1)\n4. Create v2 config: `needle init` (v2 detects and migrates compatible settings)\n5. Test with single worker: `needle run --workspace /path --count 1`\n6. Scale up: `needle run --count N`\n\n### What Carries Over\n\n- `.beads/` directories (unchanged, same `br` backend)\n- Workspace structure\n- Agent CLIs (same Claude Code, OpenCode, etc.)\n\n### What Does Not Carry Over\n\n- Config format (new YAML schema)\n- Telemetry logs (new JSONL schema)\n- Worker state files (new format)\n- v1's build system, source files, and bash modules\n\n## Test Strategy\n\n### Unit Tests\n\n| Module | Key Tests |\n|--------|-----------|\n| `outcome` | Every exit code maps to correct outcome variant |\n| `strand` | Each strand returns correct StrandResult for each scenario |\n| `claim` | Race lost, success, store error, max retries |\n| `config` | Precedence: CLI > env > workspace > global > default |\n| `telemetry` | Events serialized correctly, sequence monotonic |\n| `health` | Stale detection, crashed vs stuck distinction |\n| `bead_store` | JSON parsing handles all `br` output formats, including errors |\n| `prompt` | Deterministic: same bead → same prompt hash |\n\n### Integration Tests\n\n| Test | What It Validates |\n|------|-------------------|\n| **End-to-end single worker** | Full loop: select → claim → build → dispatch (mock agent) → outcome → log |\n| **Multi-worker claiming** | N workers, M beads: all beads claimed exactly once, no duplicates |\n| **Crash recovery** | Kill worker mid-execution, verify peer releases claim |\n| **Database corruption** | Corrupt SQLite, verify auto-repair and continued operation |\n| **Timeout enforcement** | Agent that sleeps forever is killed after timeout |\n| **Strand waterfall** | Empty workspace → explore → mend → knot progression |\n| **Mitosis split** | Multi-task bead fails → agent proposes children → children created with correct dependencies |\n| **Mitosis dedup** | Same parent split twice → second pass creates zero new children |\n| **Mitosis concurrency** | Two workers attempt mitosis on same parent → flock serializes, no duplicates |\n\n### Property Tests\n\n| Property | Description |\n|----------|-------------|\n| **Deterministic ordering** | For any queue state, all workers compute the same candidate ordering |\n| **Exhaustive outcomes** | The outcome enum covers all possible exit codes (no `_` wildcard) |\n| **Claim exclusivity** | Given N concurrent claim attempts on 1 bead, exactly 1 succeeds |\n| **Heartbeat liveness** | A healthy worker's heartbeat is always within TTL |\n\n### No Mocking of `br`\n\nFrom `docs/notes/mitosis-explosion-postmortem.md`: v1's tests mocked `br` output and missed that `br show --json` never included labels. v2 integration tests run against a real `br` instance with a test `.beads/` directory.\n\n---\n\n# Phase 4: Self-Learning\n\n**Goal:** NEEDLE workers improve over time. The fleet closes the feedback loop between outcomes and future behavior. Workers learn from their own failures, from each other, and from structured meta-analysis.\n\n**Research basis:** `docs/research/self-learning-agents.md` (2026-04-04). Key influences: AutoAgent (meta-agent harness optimization), KAIROS (memory consolidation daemon), Voyager (skill libraries), and Anthropic's eval roadmap.\n\n## Design Principles (Phase 4-Specific)\n\nThese extend — not replace — the six core principles.\n\n7. **Closed feedback loop.** Every outcome feeds forward into future behavior. A worker that fails today must not fail the same way tomorrow. The path from failure to learning to changed behavior is explicit and auditable.\n\n8. **Separation of learning from execution.** Workers execute tasks. A separate process (reflect strand, meta-agent, or consolidation daemon) synthesizes learnings. This follows AutoAgent's key finding: being good at a domain and being good at improving at that domain are different capabilities.\n\n9. **Traces over scores.** Binary success/failure is insufficient for improvement. Full execution traces (tool calls, agent reasoning, verifier output) are required for root cause analysis. AutoAgent demonstrated that improvement rate drops hard without traces.\n\n10. **Model empathy.** The meta-agent or reflect agent should use the same model family as the task workers. Same-model pairing produces better harness edits because the meta-agent shares implicit understanding of the task model's reasoning patterns and limitations.\n\n## Architecture Addition\n\nPhase 4 adds a **Learning Layer** that sits alongside the existing five layers:\n\n```\n┌──────────────────────────────────────────────────────────────┐\n│                        CLI Layer                              │\n│  needle run | reflect | stats | ... (existing)                │\n├──────────────────────────────────────────────────────────────┤\n│                     Worker Layer                              │\n│  Worker loop, strand waterfall, session management            │\n├──────────────────────────────────────────────────────────────┤\n│                   Learning Layer (NEW)                         │\n│  Retrospectives, consolidation, trace capture, skill library  │\n├──────────────────────────────────────────────────────────────┤\n│                  Coordination Layer                            │\n│  Claiming, locking, heartbeats, peer awareness                │\n├──────────────────────────────────────────────────────────────┤\n│                    Agent Layer                                 │\n│  Adapter interface, dispatch, result capture, TRACE CAPTURE   │\n├──────────────────────────────────────────────────────────────┤\n│                   Foundation Layer                             │\n│  Telemetry, configuration, bead store interface, self-healing │\n└──────────────────────────────────────────────────────────────┘\n```\n\n### New Component Map (Phase 4)\n\n| Component | Responsibility | Inputs | Outputs |\n|-----------|---------------|--------|---------|\n| **TraceCapture** | Capture full execution traces from agent runs | Agent stdout/stderr, tool call logs | Structured trace files (JSONL) |\n| **Retrospective** | Extract learning from completed beads | Bead close body, execution trace, outcome | Structured retrospective entries |\n| **Learnings** | Workspace-scoped knowledge store | Retrospective entries | `learnings.md` updates |\n| **Consolidator** | Periodic pattern extraction and pruning | All retrospectives since last run | Updated learnings, CLAUDE.md proposals |\n| **SkillLibrary** | Indexed store of proven procedures | Validated learnings, successful patterns | Skill files, context injection |\n| **TemplateVersioner** | Track prompt template versions in telemetry | Template content, hash | Versioned telemetry tags |\n| **StatsEngine** | Aggregate outcomes by template version, task type, worker | Telemetry JSONL | Success rates, comparisons |\n\n## Trace Capture\n\n### Problem\n\nNEEDLE currently captures exit code, stdout, and stderr from agent processes. This is sufficient for outcome classification but insufficient for learning. To understand *why* a task failed, we need the full execution trace: every tool call, every decision point, every piece of agent reasoning.\n\n### Design\n\nExtend the `dispatch` module to capture structured traces alongside raw output:\n\n```\nstruct ExecutionResult {\n    exit_code: i32,\n    stdout: String,\n    stderr: String,\n    elapsed: Duration,\n    pid: u32,\n    trace_path: Option<PathBuf>,  // NEW: path to structured trace file\n}\n```\n\nTrace capture is adapter-specific:\n\n| Agent | Trace Source | Format |\n|-------|-------------|--------|\n| Claude Code | `--output-format json` or session transcript | Claude JSONL |\n| Codex | Agent output stream | OpenAI JSONL |\n| Aider | Chat history file | Aider markdown |\n| Generic | stdout/stderr passthrough | Raw text |\n\nTraces are stored in `.beads/traces/<bead-id>/`:\n\n```\n.beads/traces/nd-a3f8/\n  trace.jsonl         # structured tool calls and reasoning\n  stdout.txt          # raw stdout\n  stderr.txt          # raw stderr\n  metadata.json       # timing, tokens, cost, template version\n```\n\n### Trace Sanitization\n\nAgent output routinely contains secrets: API keys, database connection strings, auth tokens, environment variables, and credentials. Storing these as plain JSONL in `.beads/traces/` is a data leak. All traces are sanitized before being written to disk.\n\n**Rule source: gitleaks.** Rather than hand-rolling regex patterns, NEEDLE imports the rule database from [gitleaks](https://github.com/gitleaks/gitleaks) — the industry-standard secret detection tool. Gitleaks ships 222 rules in a single TOML file (`config/gitleaks.toml`) covering 120+ services across cloud providers, AI/ML platforms, CI/CD, payment processors, communication tools, and generic patterns. The regexes use RE2 syntax, which is directly compatible with Rust's `regex` crate.\n\n**Sanitization pipeline (applied to all trace content before write):**\n\n1. **Gitleaks rule set.** NEEDLE vendors a copy of `gitleaks.toml` at build time and parses the `[[rules]]` entries. Each rule provides:\n   - `regex` — RE2 pattern matching the secret\n   - `keywords` — fast pre-filter strings checked before the expensive regex (Aho-Corasick). If keywords are specified and none are found in the content, the regex is skipped.\n   - `secretGroup` — which capture group contains the actual secret (only that portion is redacted, preserving surrounding context)\n   - `entropy` — minimum Shannon entropy threshold. Distinguishes real secrets from placeholders like `your-api-key-here`.\n\n   Key rule categories:\n   | Category | Examples | Rule Count |\n   |----------|----------|------------|\n   | Cloud providers | AWS access keys, Azure AD secrets, GCP API keys | ~25 |\n   | AI/ML | Anthropic, OpenAI, HuggingFace, Cohere API keys | ~8 |\n   | Git/CI/CD | GitHub PATs, GitLab tokens, CircleCI, Drone | ~25 |\n   | Communication | Slack (8 token types), Discord, Telegram, Twilio | ~15 |\n   | Payment/Finance | Stripe, Plaid, Coinbase, Kraken | ~12 |\n   | DevOps/Infra | HashiCorp Vault, Grafana, Datadog, Sentry | ~15 |\n   | Generic | `generic-api-key`, JWT, private keys (RSA/EC), curl auth headers | ~10 |\n   | Package registries | npm, PyPI, NuGet, RubyGems | ~8 |\n\n   Redaction output includes the rule ID for auditability: `[REDACTED:aws-access-token]`\n\n2. **Custom patterns.** Workspace-specific patterns configured in `.needle.yaml`, applied after the gitleaks rules:\n   ```yaml\n   learning:\n     trace_sanitization:\n       custom_patterns:\n         - id: \"kalshi-api-key\"\n           regex: \"KALSHI_API_KEY=[^\\\\s]+\"\n           keywords: [\"kalshi\"]\n         - id: \"openbao-token\"\n           regex: \"openbao\\\\s+token\\\\s+\\\\S+\"\n           keywords: [\"openbao\"]\n       redaction_text: \"[REDACTED]\"    # default: \"[REDACTED:<rule-id>]\"\n   ```\n\n3. **Gitleaks allowlists and stopwords.** The gitleaks rule set includes per-rule allowlists (regexes, paths, stopwords) and ~1,480 global stopwords that suppress common false positives (e.g., `example`, `test`, `placeholder`). NEEDLE applies these to reduce over-redaction.\n\n4. **Known-safe passthrough.** Structured fields that are never secrets (bead IDs, file paths, exit codes, timestamps, tool names) bypass sanitization for performance.\n\n**Implementation approach:**\n\n- **Option A (preferred): Vendor the TOML.** Include `gitleaks.toml` as a build-time asset. Parse it with `toml` crate into rule structs. Apply keyword pre-filter (Aho-Corasick via `aho-corasick` crate), then regex, then entropy check. This gives full control, no runtime dependency, and works offline.\n- **Option B: Shell out to gitleaks.** Pipe trace content through `gitleaks stdin --no-git`. Simpler but adds a runtime dependency and process overhead per trace file.\n\nOption A is preferred because trace sanitization is on the critical write path — it must be fast and cannot fail due to a missing binary.\n\n**Updating the rule set:** `gitleaks.toml` is vendored, not dynamically fetched. To update, run `needle update-rules` which downloads the latest `config/gitleaks.toml` from the gitleaks repository and rebuilds. Rule updates are versioned in NEEDLE's git history.\n\n**Design notes:**\n- Sanitization is best-effort, not a security boundary. Traces should still be treated as sensitive and not committed to git or shared externally.\n- The redaction is one-way — original content is not recoverable from sanitized traces. If a secret appears in a trace, it is replaced with `[REDACTED:<rule-id>]` and the original is lost.\n- Sanitization runs synchronously before the trace file is written. There is no window where unsanitized content exists on disk.\n- Over-redaction is preferred to under-redaction. A false positive (redacting a non-secret that looks like a key) is acceptable; a false negative (leaking a real key) is not.\n- The keyword pre-filter is critical for performance. Without it, running 222 regexes against every line of trace output would be prohibitive. Keywords reduce the candidate set to ~5-10 rules per line on average.\n\n### Trace Retention\n\nTraces are large. Retention policy:\n\n- **Failed beads:** Keep traces for 30 days (needed for failure analysis)\n- **Successful beads:** Keep metadata.json only, delete trace.jsonl after 7 days\n- **Configurable:** `learning.trace_retention_days` in `.needle.yaml`\n\n## Bead Retrospectives\n\n### Integration with Pluck Template\n\nThe pluck template is extended with retrospective instructions. Before closing a bead, the agent writes a structured learning block:\n\n```\n## Retrospective\n- **What worked:** [approach that succeeded]\n- **What didn't:** [approach that failed and why]\n- **Surprise:** [anything unexpected about the codebase/tooling]\n- **Reusable pattern:** [if this task type recurs, do X]\n```\n\nThis block is included in the `br close --body` content. It lives in the JSONL log alongside all other bead data.\n\n### Retrospective Extraction\n\nThe consolidator reads bead close bodies and extracts retrospective blocks into structured data:\n\n```json\n{\n  \"bead_id\": \"nd-a3f8\",\n  \"worker_id\": \"needle-claude-anthropic-sonnet-alpha\",\n  \"timestamp\": \"2026-04-04T15:30:00Z\",\n  \"task_type\": \"bug-fix\",\n  \"what_worked\": \"...\",\n  \"what_didnt\": \"...\",\n  \"surprise\": \"...\",\n  \"reusable_pattern\": \"...\"\n}\n```\n\n## Workspace Learnings File\n\n### Structure\n\nEach workspace has a `.beads/learnings.md` loaded into all prompts via `context_files`:\n\n```yaml\n# .needle.yaml\nprompt:\n  context_files:\n    - CLAUDE.md\n    - plan.md\n    - .beads/learnings.md    # <-- injected automatically when present\n```\n\n### Entry Format\n\n```markdown\n### 2026-04-04 | bead: nd-a3f8 | worker: alpha | type: bug-fix\n- **Observation:** The kalshi API rate-limits at 5 req/s, not 10 as documented\n- **Confidence:** high (verified empirically)\n- **Source:** retrospective from bead nd-a3f8\n```\n\n### Size Management\n\n- Maximum 80 active entries (configurable: `learning.max_learnings`)\n- When exceeded, the consolidator runs automatically\n- Entries older than 90 days without reinforcement are pruned\n- Entries reinforced by multiple beads get higher retention priority\n\n### Automatic Injection\n\nIf `.beads/learnings.md` exists in a workspace, NEEDLE automatically appends it to `context_files` during prompt building. No manual config required. Workers always see the latest learnings.\n\n## Consolidation (Reflect Strand)\n\n### New Strand: Reflect (Strand 7)\n\nPositioned after Pulse and before Splice — the meta-analysis strategy before worker failure documentation. Reflect consolidates learnings from recent work; Splice documents worker failures. Reflect should never preempt actual task execution, remote work discovery, or bead creation strands. A worker only consolidates learnings when there is genuinely nothing else to do.\n\n```\n  Strand 6: PULSE\n       │ no issues or disabled\n       ▼\n  Strand 7: REFLECT ── consolidate learnings from recent beads\n       │ consolidation complete or not needed\n       ▼\n  Strand 8: SPLICE ─── worker failure documentation\n       │ no failures\n       ▼\n  Strand 9: KNOT ───── alert human, enter backoff\n```\n\n(This renumbers Splice from Strand 7 to Strand 8, and Knot from Strand 8 to Strand 9.)\n\n**Invokes agent:** Yes — uses a consolidation-specific prompt.\n\n**Entry conditions:**\n- Strands 1-6 returned no work (reflect only runs when the worker has exhausted all work-finding and work-creation strategies)\n- At least N beads have been closed since last consolidation (default: 10)\n- At least T hours since last consolidation (default: 24)\n\n**Algorithm (KAIROS-inspired four-phase cycle):**\n\n1. **Orient:** Read current `.beads/learnings.md` and existing skills. Check file sizes.\n2. **Gather:** Read bead close bodies from `.beads/issues.jsonl` for beads closed since last consolidation. Read available traces for failed beads.\n3. **Consolidate:**\n   - Extract retrospective blocks from close bodies\n   - Identify patterns across multiple beads (same failure mode, same codebase quirk)\n   - Merge new learnings into `learnings.md`, deduplicating against existing entries\n   - Convert relative references to absolute (bead IDs, dates)\n   - If a learning appears 3+ times, promote to skill file in `.beads/skills/`\n   - If a learning contradicts an existing entry, resolve in favor of the newer evidence\n4. **Prune:**\n   - Remove entries older than 90 days without reinforcement\n   - Compress similar entries into single entries\n   - Ensure total learnings stay under 80 entries\n\n**Guardrails:**\n- Cooldown: minimum 24 hours between consolidation runs (configurable)\n- Max learnings created per run: 10\n- Max skills promoted per run: 3\n- The consolidation agent receives the workspace CLAUDE.md as context but MUST NOT modify it (read-only). CLAUDE.md changes require explicit human approval.\n\n**Exit conditions:**\n| Result | Action |\n|--------|--------|\n| Consolidation performed | Return `WorkCreated` → restart from Strand 1 (in case consolidation unblocked something) |\n| Not enough data since last run | Return `NoWork` → fall through to Strand 8 (Splice) |\n| Disabled or cooldown active | Return `NoWork` → fall through to Strand 8 (Splice) |\n\n**Configuration:**\n```yaml\nstrands:\n  reflect:\n    enabled: true              # on by default (unlike weave/unravel/pulse)\n    min_beads_since_last: 10   # minimum closed beads before consolidation\n    cooldown_hours: 24\n    max_learnings_per_run: 10\n    max_skills_per_run: 3\n    learning_retention_days: 90\n    max_learnings: 80\n```\n\n**Telemetry:**\n| Event Type | Data Fields |\n|------------|-------------|\n| `reflect.started` | `beads_since_last`, `current_learnings_count` |\n| `reflect.consolidated` | `learnings_added`, `learnings_pruned`, `skills_promoted`, `contradictions_resolved` |\n| `reflect.skipped` | `reason` (cooldown, insufficient data) |\n\n## Session Transcript Analysis\n\n### Motivation\n\nBead close bodies are structured summaries written by the agent at the end of a task. They capture *what was done* but lose the process: failed attempts, tool call sequences, recovery strategies, and decision points. The full session transcript — stored by Claude Code as JSONL files in `.claude/projects/` — contains this richer signal.\n\nReflect should analyze both sources: closed bead bodies for structured outcomes, and session transcripts for the decision-making process that led to those outcomes.\n\n### Transcript Discovery\n\nClaude Code stores session transcripts as JSONL files under `.claude/projects/<project-hash>/<session-uuid>.jsonl`. Each line is a JSON object with role, content, tool calls, and timestamps.\n\n```rust\nstruct TranscriptSession {\n    path: PathBuf,\n    workspace: PathBuf,\n    mtime: DateTime<Utc>,\n    entries: Vec<TranscriptEntry>,\n}\n\nstruct TranscriptEntry {\n    role: String,\n    content: String,\n    tool_calls: Vec<ToolCall>,\n    timestamp: Option<DateTime<Utc>>,\n}\n```\n\n**Discovery algorithm:**\n\n1. Map workspace path to `.claude/projects/` subdirectory (hash-based mapping)\n2. Enumerate all JSONL files, sorted by mtime descending\n3. Filter to sessions within configurable recency window (default: 7 days)\n4. Stream-parse each file, skipping malformed lines\n5. Return `Vec<TranscriptSession>`\n\n**Streaming:** Transcript files can be large. Parse line-by-line rather than loading entire files. Skip tool_result blocks containing base64 or binary content (truncate at 1KB).\n\n### Action-Outcome Extraction\n\nRaw transcript entries are too verbose for pattern extraction. Reflect distills them into structured action-outcome pairs:\n\n```rust\nstruct ActionOutcome {\n    action_type: String,       // tool name (Read, Edit, Bash, etc.)\n    target: String,            // file path, command, or query\n    outcome: Outcome,          // Success, Failure, Error, Retry, Workaround\n    reasoning: String,         // agent's text between tool calls (truncated to 200 chars)\n    timestamp: DateTime<Utc>,\n}\n\nenum Outcome { Success, Failure, Error, Retry, Workaround }\n```\n\n**Extraction algorithm:**\n\n1. Walk transcript entries, identify tool_call → tool_result pairs\n2. Classify outcomes: success (exit 0), failure (non-zero exit), retry (same tool, same target), workaround (different tool after failure)\n3. Capture agent reasoning text between consecutive tool calls\n4. Group consecutive related actions into logical \"attempts\"\n\n**Key patterns to extract:**\n- Failed tool calls followed by retries (friction points)\n- Successful workarounds after failures (actionable learnings)\n- Repeated tool call patterns (workflow habits)\n- Error messages encountered (common failure modes)\n\n### Pattern Merging\n\nReflect merges patterns from both sources — bead bodies and transcripts — into a unified set:\n\n1. Run existing bead-body retrospective extraction (unchanged)\n2. Run transcript action-outcome extraction (new)\n3. Deduplicate on semantic similarity:\n   - Exact match: same pattern text → merge counts\n   - Near match: same tool + same outcome + similar reasoning → merge with combined context\n   - Unique to one source: keep as-is with lower confidence score\n4. Weight by frequency across both sources — a pattern seen in beads AND transcripts is higher confidence\n5. Pass merged pattern set to existing promotion logic (learnings.md → skill files)\n\n## Drift Detection\n\n### Motivation\n\nWhen multiple workers solve the same class of problem, they may converge on different approaches. Some drift is healthy (evolving better solutions over time), some is harmful (inconsistent behavior with no progression). Detecting drift turns scattered session data into actionable standardization signals.\n\n### Session Similarity Matching\n\nBefore comparing approaches, reflect must identify which sessions solved comparable problems.\n\n**Fingerprint per session:**\n\n```rust\nstruct SessionFingerprint {\n    file_paths: HashSet<PathBuf>,      // normalized, deduplicated by directory\n    tool_outcomes: HashSet<(String, Outcome)>,  // (tool_name, outcome)\n    bead_types: HashSet<String>,        // types of beads claimed/closed\n    error_patterns: HashSet<String>,    // normalized error substrings\n}\n```\n\nSimilarity is computed as Jaccard overlap on these sets. Sessions sharing >60% overlap (configurable) are grouped into clusters.\n\n### Approach Divergence Detection\n\nFor each session cluster, reflect extracts the solution approach per session and compares them:\n\n| Divergence Category | Meaning | Action |\n|---------------------|---------|--------|\n| **Evolved** | Approaches improve over time (fewer retries, shorter paths) | Promote latest approach as learned pattern |\n| **Inconsistent** | Approaches differ with no clear progression | Flag for human review, suggest standardizing |\n| **Degraded** | Later sessions solve the same problem worse than earlier | Flag as regression, include earlier approach as reference |\n\n**Output:** `DriftReport` per cluster, fed into the consolidation pipeline alongside normal pattern extraction.\n\n**Telemetry:**\n\n| Event Type | Data Fields |\n|------------|-------------|\n| `reflect.drift.detected` | `cluster_size`, `category`, `sessions` |\n| `reflect.drift.promoted` | `pattern`, `category` |\n\n## ADR Decision Records\n\n### Motivation\n\nCurrent learnings capture *what* the agent did. But \"use `br doctor --repair` for corruption\" is less useful than knowing *why*: \"chose doctor --repair over `rm` + `sync --import-only` because the former preserves bead history.\" Reflect should preserve decision rationale alongside patterns.\n\nNot all learnings are decisions. Repeated successful habits (\"agent ran `cargo fmt` before committing\") don't need ADR treatment. Only learnings that involve a choice between alternatives warrant the richer format.\n\n### Decision Point Detection\n\nReflect detects decision points in transcript action-outcome sequences:\n\n**Signals that indicate a decision:**\n- Attempt → failure → different approach → success (implicit choice)\n- Agent reasoning text contains \"instead\", \"alternatively\", \"better approach\", \"let me try\"\n- Agent evaluated multiple options before acting (read two files, then chose one to edit)\n- Failed tool call followed by a different tool call (not a retry)\n\n```rust\nstruct DecisionPoint {\n    attempted_first: String,    // what was tried\n    failed_with: String,        // error or reason for failure\n    chose_instead: String,      // what was chosen after failure\n    rationale: String,          // agent's reasoning between failure and new approach\n    succeeded: bool,\n}\n```\n\n### ADR-Lite Format in CLAUDE.md\n\nWhen a promoted learning has an associated DecisionPoint, it is written in ADR-lite format. Habit/workflow patterns use the simpler flat format. Both are wrapped in HTML comment markers for identification and future updates.\n\n**Decision-type learning:**\n\n```html\n<!-- needle-learning:nd-a3f8 -->\n- **Decision**: Use `br doctor --repair` before `rm` + `sync --import-only`\n  **Context**: FrankenSQLite corruption in `.beads/` databases\n  **Rationale**: `doctor --repair` preserves bead history; full rebuild loses in-progress state\n  **ADR**: `.beads/decisions/nd-a3f8.md`\n<!-- /needle-learning:nd-a3f8 -->\n```\n\n**Habit-type learning (unchanged from current format):**\n\n```html\n<!-- needle-learning:nd-b7c2 -->\n- Always run `cargo fmt` before committing Rust code in this workspace\n<!-- /needle-learning:nd-b7c2 -->\n```\n\n### ADR Condensation into CLAUDE.md\n\nFull ADRs are stored in `.beads/decisions/<bead-id>.md` with complete context (alternatives considered, full reasoning, outcomes). CLAUDE.md entries are **condensed summaries** — the decision, context, and rationale in 2-3 lines — with a reference back to the full ADR via the `**ADR:**` line.\n\nThis keeps CLAUDE.md compact (it's loaded into every system prompt) while preserving the full decision record for deeper review.\n\n**Full ADR file** (`.beads/decisions/nd-a3f8.md`):\n\n```markdown\n# ADR: Database Recovery Strategy\n\n## Context\nFrankenSQLite corruption in .beads/ databases causes \"database disk image is malformed\" errors during br operations.\n\n## Alternatives Considered\n1. `br doctor --repair` — reconstructs DB from JSONL, preserves in-progress state\n2. `rm .beads/beads.db` + `br sync --import-only` — full rebuild, loses in-progress claims\n3. Manual SQLite `PRAGMA integrity_check` + targeted repair — fragile, version-specific\n\n## Decision\nUse `br doctor --repair` as first-line recovery.\n\n## Rationale\n- Preserves bead history and in-progress claim state\n- JSONL is always authoritative — repair reconstructs from source of truth\n- `rm + sync` is a fallback only when repair itself fails\n\n## Outcome\nResolved corruption for workers alpha, echo, foxtrot, hotel on 2026-04-26.\n```\n\n### Placement: Lowest Common Ancestor CLAUDE.md\n\nPromoted learnings are placed in the CLAUDE.md at the **lowest common ancestor** directory covering all workspaces where the pattern was observed. This ensures the learning appears in the system prompt only when working in relevant projects.\n\n**Resolution algorithm:**\n\n1. Track which workspaces contributed each pattern during extraction\n2. Find the deepest directory that is a parent of all contributing workspaces\n3. Check for an existing CLAUDE.md at that directory\n4. If no CLAUDE.md exists, create one with a `## NEEDLE Learnings` section\n5. If a learning applies to a single workspace only, write to that workspace's CLAUDE.md\n6. If a learning applies across all workspaces, write to `~/CLAUDE.md`\n\n**Edge cases:**\n- Pattern observed in repos under `~/ardenone-cluster/` → write to `~/ardenone-cluster/CLAUDE.md`\n- Pattern observed in repos spanning multiple top-level directories → write to `~/CLAUDE.md`\n- CLAUDE.md doesn't exist at target level → create it\n\n**Deduplication:** Before appending, check for existing needle-learning entries with similar content (fuzzy match on first line). Update rather than duplicate.\n\n**Telemetry:**\n\n| Event Type | Data Fields |\n|------------|-------------|\n| `reflect.learning.promoted` | `learning_id`, `target_path`, `workspace_count`, `is_decision` |\n| `reflect.learning.deduplicated` | `learning_id`, `existing_entry` |\n\n## Skill Library\n\n### Structure\n\n```\n.beads/skills/\n  api-rate-limit-handling.md\n  database-migration-pattern.md\n  flaky-test-diagnosis.md\n```\n\n### Skill File Format\n\n```markdown\n---\ntask_types: [bug-fix, api-integration]\nlabels: [api, rate-limiting]\nsuccess_count: 7\nlast_used: 2026-04-03\nsource_beads: [nd-a3f8, nd-b7c2, nd-d1e5]\n---\n\n## API Rate Limit Handling\n\nWhen hitting external APIs, implement exponential backoff with jitter...\n\n### Steps\n1. Check API documentation for stated limits\n2. Implement retry with exponential backoff (base 2s, max 60s, jitter ±500ms)\n3. Log rate limit responses for monitoring\n4. Consider request batching if supported\n\n### Known Limits\n- Kalshi: 5 req/s (documented as 10, actual is 5)\n```\n\n### Skill Retrieval\n\nDuring prompt building (BUILDING state), the PromptBuilder:\n\n1. Reads the bead's labels and title\n2. Matches against skill file `task_types` and `labels` fields\n3. Injects top 3 matching skills (by `success_count`) into the prompt\n4. Skills are appended after learnings, before the task instructions\n\n### Skill Lifecycle\n\n```\nObservation (learnings.md entry)\n    │ appears 3+ times across different beads\n    ▼\nPromoted to skill (.beads/skills/<name>.md)\n    │ used by workers, success_count incremented\n    ▼\nValidated (success_count > threshold)\n    │ optionally proposed as CLAUDE.md convention\n    ▼\nConvention (human approves, added to CLAUDE.md)\n```\n\n## Template Versioning and A/B Testing\n\n### Version Tagging\n\nEach prompt template gets a version string. The version is included in telemetry events:\n\n```json\n{\n  \"event_type\": \"agent.dispatched\",\n  \"data\": {\n    \"template_name\": \"pluck\",\n    \"template_version\": \"pluck-v3\",\n    \"prompt_hash\": \"sha256:a1b2c3...\"\n  }\n}\n```\n\n### Stats Command\n\n```\n$ needle stats --by template_version --since 7d\n\nTemplate Version  | Beads | Pass | Fail | Timeout | Pass Rate | Avg Tokens | Avg Cost\npluck-v2          |    45 |   38 |    5 |       2 |    84.4%  |     12,400 |   $0.42\npluck-v3          |    23 |   21 |    1 |       1 |    91.3%  |     10,800 |   $0.38\n\n$ needle stats --by task_type --since 30d\n\nTask Type    | Beads | Pass | Fail | Timeout | Pass Rate\nbug-fix      |    89 |   78 |    8 |       3 |    87.6%\nfeature      |    45 |   32 |   10 |       3 |    71.1%\nrefactor     |    23 |   21 |    2 |       0 |    91.3%\ntest         |    34 |   31 |    3 |       0 |    91.2%\n\n$ needle stats --by worker --since 7d\n\nWorker   | Beads | Pass | Fail | Pass Rate | Total Cost\nalpha    |    28 |   24 |    4 |    85.7%  |   $11.76\nbravo    |    31 |   27 |    4 |    87.1%  |   $12.09\ncharlie  |    25 |   20 |    5 |    80.0%  |   $10.50\n```\n\n### A/B Testing\n\nWhen modifying a template, assign workers to template variants:\n\n```yaml\n# .needle.yaml\nprompt:\n  templates:\n    pluck:\n      variants:\n        - name: pluck-v3\n          weight: 50        # 50% of workers get v3\n          content_file: templates/pluck-v3.md\n        - name: pluck-v4\n          weight: 50        # 50% of workers get v4\n          content_file: templates/pluck-v4.md\n```\n\nWorker assignment is deterministic: `hash(worker_id) % 100 < weight` determines which variant a worker uses. This ensures the same worker always uses the same variant within a session.\n\nAfter sufficient beads (configurable threshold, default 50 per variant), `needle stats` shows a comparison. The operator promotes the winner.\n\n## Cross-Workspace Knowledge\n\n### Global Learnings\n\nA global learnings file at `~/.config/needle/global-learnings.md` is loaded into all workspace prompts as supplementary context. Contains cross-cutting lessons:\n\n- Infrastructure quirks (git, ssh, API behaviors)\n- Tooling gotchas (br CLI edge cases, compiler warnings)\n- General coding patterns (not workspace-specific)\n\n**Population:** When the consolidator detects a learning that appears across 2+ workspaces, it promotes a copy to global learnings.\n\n**Size limit:** 40 entries (cross-cutting lessons should be distilled).\n\n### Label-Based Skill Sharing\n\nSkills tagged with generic labels (`rust`, `kubernetes`, `api`, `testing`) are available to any workspace with matching labels in `.needle.yaml`:\n\n```yaml\n# .needle.yaml for kalshi-weather\nworkspace:\n  labels: [rust, api, trading]\n```\n\nDuring prompt building, the PromptBuilder checks both workspace-local skills and global skills matching the workspace's label set.\n\n## Future: Meta-Agent Harness Optimization (AutoAgent Pattern)\n\nThis section describes a potential Phase 5 capability. It is not part of Phase 4 but is documented here to inform Phase 4's design decisions (trace capture format, template versioning, stats infrastructure).\n\n### Concept\n\nA meta-agent that reads NEEDLE telemetry, execution traces, and bead outcomes, then modifies prompt templates, tool configurations, and orchestration logic to improve fleet-wide success rates.\n\nFollowing AutoAgent's architecture:\n- **Meta-agent** reads `needle stats`, execution traces, and failure patterns\n- **Task agents** are the normal NEEDLE workers\n- **The edit surface** is the prompt templates, tool configs, and `.needle.yaml` settings\n- **The fixed boundary** is NEEDLE's core: state machine, claiming protocol, telemetry, strand waterfall\n\n### Prerequisites (Built in Phase 4)\n\n- Structured trace capture (traces must be machine-readable)\n- Template versioning (must be able to create and track template variants)\n- Stats infrastructure (must be able to measure improvement)\n- Skill library (must have a place to store discovered tools/procedures)\n\n### Key Design Constraints (from AutoAgent Learnings)\n\n1. **Meta-agent is separate from task agents.** It runs as a distinct process, not within the worker loop.\n2. **Same-model pairing.** Meta-agent should use the same model family as fleet workers.\n3. **Git-versioned edits.** Every template modification is a git commit for traceability and rollback.\n4. **Hill-climb on pass rate.** Keep/discard is strictly score-driven. Traces inform what to try; scores determine what to keep.\n5. **The overfitting test.** \"If this exact bead disappeared, would this still be a worthwhile template improvement?\"\n6. **Prompt tuning has diminishing returns.** The meta-agent should focus on tool design and orchestration improvements, not just prompt rewording.\n\n## Phase 4 Deliverables\n\n| Component | Scope |\n|-----------|-------|\n| **Trace capture** | Adapter-specific structured trace collection, storage in `.beads/traces/` |\n| **Retrospective instructions** | Pluck template extension with learning block |\n| **Workspace learnings** | `.beads/learnings.md` automatic injection, size management |\n| **Reflect strand** | Consolidation daemon as strand 7 + `needle reflect` CLI |\n| **Skill library** | `.beads/skills/` with promotion lifecycle, skill retrieval in PromptBuilder |\n| **Template versioning** | Version tags in telemetry, A/B variant assignment |\n| **Stats engine** | `needle stats` command with template/task-type/worker aggregation |\n| **Global learnings** | Cross-workspace learning promotion |\n| **Label-based skill sharing** | Cross-workspace skill retrieval by label match |\n| **Trace retention** | Configurable cleanup of trace files |\n| **Session transcript analysis** | Parse Claude Code JSONL transcripts, extract action-outcome pairs, merge with bead-body patterns |\n| **Drift detection** | Session similarity clustering, approach divergence classification (evolved/inconsistent/degraded) |\n| **ADR decision records** | Decision point detection from transcripts, ADR-lite format in CLAUDE.md, full ADRs in `.beads/decisions/` |\n| **CLAUDE.md placement** | Lowest-common-ancestor directory resolution for promoted learnings, auto-create if missing |\n\n### Success Criteria\n\n- [ ] Traces are sanitized before write using vendored gitleaks rules (222 patterns) — no unsanitized window on disk\n- [ ] Keyword pre-filter (Aho-Corasick) skips irrelevant rules; sanitization adds <10ms per trace file\n- [ ] Custom sanitization patterns in `.needle.yaml` are applied alongside gitleaks rules\n- [ ] `needle update-rules` fetches latest `gitleaks.toml` from upstream\n- [ ] Workers produce structured execution traces for all adapter types\n- [ ] Pluck template includes retrospective instructions; >80% of closed beads contain a retrospective block\n- [ ] `.beads/learnings.md` is automatically injected into prompts when present\n- [ ] Reflect strand runs after 10+ beads closed, consolidates learnings, prunes stale entries\n- [ ] Learnings that appear 3+ times are promoted to skills in `.beads/skills/`\n- [ ] Skills are retrieved by label/task-type match and injected into prompts\n- [ ] `needle stats` shows pass rates by template version, task type, and worker\n- [ ] A/B template variants assign workers deterministically and track outcomes separately\n- [ ] Learnings appearing in 2+ workspaces are promoted to global learnings\n- [ ] Trace retention automatically cleans old traces per configured policy\n- [ ] A worker that encounters a previously-solved failure mode receives the relevant skill in its prompt\n- [ ] Fleet-wide pass rate measurably improves over a 30-day period (tracked via `needle stats`)\n- [ ] Reflect parses Claude Code session JSONL transcripts and extracts action-outcome pairs\n- [ ] Transcript-derived patterns are merged with bead-body patterns, deduplicated by semantic similarity\n- [ ] Reflect detects session clusters solving similar problems and classifies approach divergence\n- [ ] Drift reports categorize as evolved (promote latest), inconsistent (flag for review), or degraded (flag regression)\n- [ ] Decision points are detected from transcripts (failure → different approach → success sequences)\n- [ ] Promoted learnings with decision context are written in ADR-lite format in CLAUDE.md\n- [ ] Full ADRs stored in `.beads/decisions/<bead-id>.md`, CLAUDE.md entries reference them via `**ADR:**` line\n- [ ] Promoted learnings are placed in the CLAUDE.md at the lowest common ancestor of contributing workspaces\n\n### Estimated Scope\n\n~12 additional source files, ~5,200 additional LOC.\n\nNew module additions:\n```\nneedle (binary)\n├── ... (existing modules)\n├── learning/          Retrospective extraction, learnings management\n├── skill/             Skill library, retrieval, promotion\n├── trace/             Trace capture, storage, retention\n├── transcript/        Session JSONL parsing, action-outcome extraction\n├── drift/             Session similarity, clustering, divergence detection\n├── decision/          Decision point detection, ADR management\n├── placement/         CLAUDE.md lowest-common-ancestor resolution\n└── stats/             Aggregation engine, A/B comparison\n```\n\nDependency additions:\n```\nlearning    ──► bead_store, telemetry, types\nskill       ──► bead_store, config, types\ntrace       ──► dispatch, config, types\ntranscript  ──► config, types\ndrift       ──► transcript, telemetry, types\ndecision    ──► transcript, types\nplacement   ──► config, types\nstats       ──► telemetry, config, types\n```\n","structuredPatch":[{"oldStart":444,"oldLines":12,"newStart":444,"newLines":12,"lines":[" ├── cli/              CLI parsing, session management"," ├── worker/           Worker loop, state machine"," ├── strand/           Strand waterfall evaluation","-│   └── splice/       Worker failure documentation","+│   └── splice.rs     Worker failure documentation"," ├── claim/            Atomic claiming, lock management"," ├── prompt/           Prompt construction from bead context"," ├── dispatch/         Agent adapter loading, process execution"," ├── outcome/          Exit code classification, outcome handlers","-├── commit_hook/      Bead-Id trailer injection for git commits","+├── commit_hook.rs    Bead-Id trailer injection for git commits"," ├── telemetry/        Structured event emission, sinks"," ├── health/           Heartbeat, stuck detection, peer monitoring"," ├── config/           Hierarchical configuration loading"]}],"userModified":false,"replaceAll":false}}
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{"type":"user","message":{"role":"user","content":[{"tool_use_id":"call_1e12dfc480d2433ab288f394","type":"tool_result","content":"870\t- Every flag has a one-line description\n871\t- Default values shown in brackets (sourced from config)\n872\t- Subcommand grouping follows the lifecycle: launch → monitor → operate → maintain\n873\t- `needle help <command>` and `needle <command> --help` are equivalent\n874\t- Help output is plain text, no colors, suitable for piping to other tools or agents\n875\t\n876\t---\n877\t\n878\t# Strand Waterfall\n879\t\n880\tStrands are NEEDLE's strategy for finding work. They are evaluated in strict sequence — the first strand that yields actionable work wins. When a strand returns `NoWork`, the worker falls through to the next.\n881\t\n882\tThe waterfall is the answer to \"what does a worker do when it has no beads?\" It is not a priority system for beads (that's handled by deterministic ordering within each strand). It is a priority system for *strategies*.\n883\t\n884\t## Waterfall Sequence\n885\t\n886\t```\n887\t  Strand 1: PLUCK ──── primary work from assigned workspace\n888\t       │ no work\n889\t       ▼\n890\t  Strand 2: MEND ───── cleanup: stale claims, orphaned locks, health\n891\t       │ nothing to clean\n892\t       ▼\n893\t  Strand 3: EXPLORE ── look for work in other configured workspaces\n894\t       │ no work\n895\t       ▼\n896\t  Strand 4: WEAVE ──── create beads from documentation gaps (opt-in)\n897\t       │ no gaps or disabled\n898\t       ▼\n899\t  Strand 5: UNRAVEL ── propose alternatives for HUMAN-blocked beads (opt-in)\n900\t       │ none or disabled\n901\t       ▼\n902\t  Strand 6: PULSE ──── codebase health scan, auto-generate beads (opt-in)\n903\t       │ no issues or disabled\n904\t       ▼\n905\t  Strand 7: REFLECT ── consolidate learnings from recent beads\n906\t       │ consolidation complete or not needed\n907\t       ▼\n908\t  Strand 8: SPLICE ──── worker failure documentation\n909\t       │ no failures\n910\t       ▼\n911\t  Strand 9: KNOT ───── alert human, enter backoff\n912\t       │\n913\t       ▼\n914\t  → EXHAUSTED (backoff and retry from Strand 1)\n915\t```\n916\t\n917\t## Strand 1: Pluck\n918\t\n919\t**Purpose:** Process beads from the worker's assigned workspace. This is the primary work strand and will handle >90% of all bead processing.\n920\t\n921\t**Invokes agent:** Yes.\n922\t\n923\t**Entry condition:** Worker has an assigned workspace with a `.beads/` directory.\n924\t\n925\t**Algorithm:**\n926\t1. Query bead store: `br ready --unassigned --json` in workspace\n927\t2. Filter: exclude beads with labels `deferred`, `human`, `blocked`\n928\t3. Filter: exclude beads in the current retry exclusion set\n929\t4. Sort: priority (ascending, 0 = highest), then creation time (ascending, oldest first)\n930\t5. Return sorted candidates for claiming\n931\t\n932\t**Exit conditions:**\n933\t| Result | Action |\n934\t|--------|--------|\n935\t| Candidates found | Return `BeadFound(candidates)` → worker proceeds to CLAIMING |\n936\t| No candidates (queue empty) | Return `NoWork` → fall through to Strand 2 |\n937\t| Bead store error | Emit telemetry, return `Error` → fall through to Strand 2 |\n938\t\n939\t**Determinism guarantee:** The sort key `(priority, created_at)` produces the same ordering for all workers viewing the same queue state. Workers will compete for the same top-priority bead, and the claim mechanism resolves contention.\n940\t\n941\t## Strand 2: Mend\n942\t\n943\t**Purpose:** Maintenance and cleanup operations that keep the bead store healthy. Runs before Explore because cleaning up stale claims or broken dependencies in the home workspace may unblock beads here — no need to roam if local work is just stuck.\n944\t\n945\t**Invokes agent:** No.\n946\t\n947\t**Entry condition:** Strand 1 returned no work.\n948\t\n949\t**Algorithm:**\n950\t1. **Stale claim cleanup:** Find beads with status `in_progress` where the assigned worker has no active heartbeat (TTL expired). Release them.\n951\t2. **Orphaned lock cleanup:** Find workspace lock files older than TTL. Remove them.\n952\t3. **Dependency cleanup:** Find closed beads that are still listed as blockers on open beads. Remove the stale dependency links.\n953\t4. **Database health:** Run `br doctor` (not `--repair` unless errors found).\n954\t\n955\t**Exit conditions:**\n956\t| Result | Action |\n957\t|--------|--------|\n958\t| Cleanup performed | Return `WorkCreated` → restart from Strand 1 (released beads may now be claimable) |\n959\t| Nothing to clean | Return `NoWork` → fall through to Strand 3 |\n960\t\n961\t**Design notes (from `docs/notes/bead-lifecycle-bugs.md`):**\n962\t- Stale dependency links caused permanent blocking in NEEDLE-deprecated. Mend must clean these.\n963\t- Distinguish \"did work\" from \"found nothing\" — v1 had an infinite loop where mend returned success on failed releases.\n964\t\n965\t## Strand 3: Explore\n966\t\n967\t**Purpose:** Discover work in other configured workspaces when the home workspace is empty and clean.\n968\t\n969\t**Invokes agent:** No. Explore only finds candidates — execution happens back through the standard CLAIMING → DISPATCHING flow.\n970\t\n971\t**Entry condition:** Strands 1-2 returned no work. Explore is enabled in config. At least one additional workspace is configured.\n972\t\n973\t**Algorithm:**\n974\t1. Read configured workspace list from config (explicit paths, no filesystem scanning)\n975\t2. For each workspace (in configured order):\n976\t   a. Check `.beads/` directory exists\n977\t   b. Query `br ready --unassigned --json`\n978\t   c. If candidates found, return them with workspace context\n979\t3. If no workspace has work, return `NoWork`\n980\t\n981\t**Exit conditions:**\n982\t| Result | Action |\n983\t|--------|--------|\n984\t| Candidates found in another workspace | Return `BeadFound(candidates)` with workspace override |\n985\t| No candidates in any workspace | Return `NoWork` → fall through to Strand 4 |\n986\t\n987\t**Design notes (from `docs/notes/explore-strand-bugs.md`):**\n988\t- **No filesystem scanning.** NEEDLE-deprecated's `find`-based discovery caused 35+ CPU load with 40 workers. Workspaces must be explicitly configured.\n989\t- **No upward traversal.** The v1 explore strand walked up parent directories to `/home`, then `/`. This is eliminated.\n990\t- **Workspace list is static** for the duration of a session. It is read from config at boot and not re-evaluated.\n991\t- **Workers do not permanently relocate.** If a worker finds work in another workspace, it processes that bead and returns to its home workspace for the next cycle.\n992\t\n993\t## Strand 4: Weave (opt-in)\n994\t\n995\t**Purpose:** Analyze workspace documentation for gaps and create new beads to address them.\n996\t\n997\t**Invokes agent:** Yes — uses the agent to analyze documentation and propose beads.\n998\t\n999\t**Entry condition:** Strands 1-3 (Pluck, Mend, Explore) returned no work. Weave is explicitly enabled in workspace config (`strands.weave.enabled: true`).\n1000\t\n1001\t**Algorithm:**\n1002\t1. Identify documentation files (README, AGENTS.md, docs/, etc.)\n1003\t2. Dispatch agent with gap-analysis prompt\n1004\t3. Agent proposes new beads (as structured output)\n1005\t4. Create beads via bead store\n1006\t5. Return `WorkCreated` → restart from Strand 1\n1007\t\n1008\t**Guardrails (from `docs/notes/self-modification-risks.md`):**\n1009\t- **Max beads per weave run:** Configurable, default 5. Prevents unbounded bead creation.\n1010\t- **Cooldown period:** Minimum time between weave runs per workspace, default 24h.\n1011\t- **Seen-issues deduplication:** Track previously created weave beads to prevent duplicates.\n1012\t- **Workspace exclusion:** Weave is disabled for NEEDLE's own workspace by default. Workers must not create work for their own orchestrator without human approval.\n1013\t- **Human review label:** Weave-created beads are labeled `weave-generated` for easy filtering.\n1014\t\n1015\t**Exit conditions:**\n1016\t| Result | Action |\n1017\t|--------|--------|\n1018\t| Beads created | Return `WorkCreated` → restart from Strand 1 |\n1019\t| No gaps found | Return `NoWork` → fall through to Strand 5 |\n1020\t| Disabled | Return `NoWork` → fall through to Strand 5 |\n1021\t\n1022\t## Strand 5: Unravel (opt-in)\n1023\t\n1024\t**Purpose:** For beads labeled `human` (requiring human decision), propose alternative approaches that an agent could execute instead.\n1025\t\n1026\t**Invokes agent:** Yes — uses the agent to analyze the blocked bead and propose workarounds.\n1027\t\n1028\t**Entry condition:** Strands 1-4 returned no work. Unravel is explicitly enabled. There are beads with `human` label in the workspace.\n1029\t\n1030\t**Algorithm:**\n1031\t1. Query beads with `human` label\n1032\t2. For each (up to `max_unravel_per_run`, default 3):\n1033\t   a. Dispatch agent with the bead context and a prompt asking for alternative approaches\n1034\t   b. If agent proposes viable alternatives, create child beads with `alternative` label\n1035\t   c. Do NOT close or modify the original `human` bead\n1036\t3. Return `WorkCreated` if alternatives were created\n1037\t\n1038\t**Guardrails:**\n1039\t- Original `human` bead is never modified or closed\n1040\t- Alternative beads are linked as children (informational, not blocking)\n1041\t- Max alternatives per `human` bead: configurable, default 2\n1042\t- Cooldown: don't re-analyze a `human` bead that was analyzed within the last 7 days\n1043\t\n1044\t**Exit conditions:**\n1045\t| Result | Action |\n1046\t|--------|--------|\n1047\t| Alternatives created | Return `WorkCreated` → restart from Strand 1 |\n1048\t| No `human` beads or no alternatives viable | Return `NoWork` → fall through to Strand 6 |\n1049\t| Disabled | Return `NoWork` → fall through to Strand 6 |\n1050\t\n1051\t## Strand 6: Pulse (opt-in)\n1052\t\n1053\t**Purpose:** Scan the codebase for health issues (stale TODOs, missing tests, dependency drift, linting) and create beads for significant findings.\n1054\t\n1055\t**Invokes agent:** Yes — uses the agent (or external tools) to scan the codebase.\n1056\t\n1057\t**Entry condition:** Strands 1-5 returned no work. Pulse is explicitly enabled. Cooldown has expired.\n1058\t\n1059\t**Algorithm:**\n1060\t1. Run configured scanners (linters, test coverage, dependency checkers, TODO scanners)\n1061\t2. Compare results against previous scan (stored in `~/.needle/state/pulse/`)\n1062\t3. For new issues exceeding severity threshold, create beads\n1063\t4. Update last-scan state\n1064\t\n1065\t**Guardrails:**\n1066\t- **Max beads per pulse run:** Configurable, default 10\n1067\t- **Cooldown:** Default 48h between scans\n1068\t- **Severity threshold:** Only create beads for issues above configured severity\n1069\t- **Deduplication:** Track seen issues to prevent duplicate beads across scans"}]},"parent_tool_use_id":null,"session_id":"72539a33-4a3d-4268-95e8-c3da33ecc3f7","uuid":"9d03aed1-c553-41ad-bc5b-067a451db992","timestamp":"2026-05-30T15:28:47.481Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/NEEDLE/docs/plan/plan.md","content":"- Every flag has a one-line description\n- Default values shown in brackets (sourced from config)\n- Subcommand grouping follows the lifecycle: launch → monitor → operate → maintain\n- `needle help <command>` and `needle <command> --help` are equivalent\n- Help output is plain text, no colors, suitable for piping to other tools or agents\n\n---\n\n# Strand Waterfall\n\nStrands are NEEDLE's strategy for finding work. They are evaluated in strict sequence — the first strand that yields actionable work wins. When a strand returns `NoWork`, the worker falls through to the next.\n\nThe waterfall is the answer to \"what does a worker do when it has no beads?\" It is not a priority system for beads (that's handled by deterministic ordering within each strand). It is a priority system for *strategies*.\n\n## Waterfall Sequence\n\n```\n  Strand 1: PLUCK ──── primary work from assigned workspace\n       │ no work\n       ▼\n  Strand 2: MEND ───── cleanup: stale claims, orphaned locks, health\n       │ nothing to clean\n       ▼\n  Strand 3: EXPLORE ── look for work in other configured workspaces\n       │ no work\n       ▼\n  Strand 4: WEAVE ──── create beads from documentation gaps (opt-in)\n       │ no gaps or disabled\n       ▼\n  Strand 5: UNRAVEL ── propose alternatives for HUMAN-blocked beads (opt-in)\n       │ none or disabled\n       ▼\n  Strand 6: PULSE ──── codebase health scan, auto-generate beads (opt-in)\n       │ no issues or disabled\n       ▼\n  Strand 7: REFLECT ── consolidate learnings from recent beads\n       │ consolidation complete or not needed\n       ▼\n  Strand 8: SPLICE ──── worker failure documentation\n       │ no failures\n       ▼\n  Strand 9: KNOT ───── alert human, enter backoff\n       │\n       ▼\n  → EXHAUSTED (backoff and retry from Strand 1)\n```\n\n## Strand 1: Pluck\n\n**Purpose:** Process beads from the worker's assigned workspace. This is the primary work strand and will handle >90% of all bead processing.\n\n**Invokes agent:** Yes.\n\n**Entry condition:** Worker has an assigned workspace with a `.beads/` directory.\n\n**Algorithm:**\n1. Query bead store: `br ready --unassigned --json` in workspace\n2. Filter: exclude beads with labels `deferred`, `human`, `blocked`\n3. Filter: exclude beads in the current retry exclusion set\n4. Sort: priority (ascending, 0 = highest), then creation time (ascending, oldest first)\n5. Return sorted candidates for claiming\n\n**Exit conditions:**\n| Result | Action |\n|--------|--------|\n| Candidates found | Return `BeadFound(candidates)` → worker proceeds to CLAIMING |\n| No candidates (queue empty) | Return `NoWork` → fall through to Strand 2 |\n| Bead store error | Emit telemetry, return `Error` → fall through to Strand 2 |\n\n**Determinism guarantee:** The sort key `(priority, created_at)` produces the same ordering for all workers viewing the same queue state. Workers will compete for the same top-priority bead, and the claim mechanism resolves contention.\n\n## Strand 2: Mend\n\n**Purpose:** Maintenance and cleanup operations that keep the bead store healthy. Runs before Explore because cleaning up stale claims or broken dependencies in the home workspace may unblock beads here — no need to roam if local work is just stuck.\n\n**Invokes agent:** No.\n\n**Entry condition:** Strand 1 returned no work.\n\n**Algorithm:**\n1. **Stale claim cleanup:** Find beads with status `in_progress` where the assigned worker has no active heartbeat (TTL expired). Release them.\n2. **Orphaned lock cleanup:** Find workspace lock files older than TTL. Remove them.\n3. **Dependency cleanup:** Find closed beads that are still listed as blockers on open beads. Remove the stale dependency links.\n4. **Database health:** Run `br doctor` (not `--repair` unless errors found).\n\n**Exit conditions:**\n| Result | Action |\n|--------|--------|\n| Cleanup performed | Return `WorkCreated` → restart from Strand 1 (released beads may now be claimable) |\n| Nothing to clean | Return `NoWork` → fall through to Strand 3 |\n\n**Design notes (from `docs/notes/bead-lifecycle-bugs.md`):**\n- Stale dependency links caused permanent blocking in NEEDLE-deprecated. Mend must clean these.\n- Distinguish \"did work\" from \"found nothing\" — v1 had an infinite loop where mend returned success on failed releases.\n\n## Strand 3: Explore\n\n**Purpose:** Discover work in other configured workspaces when the home workspace is empty and clean.\n\n**Invokes agent:** No. Explore only finds candidates — execution happens back through the standard CLAIMING → DISPATCHING flow.\n\n**Entry condition:** Strands 1-2 returned no work. Explore is enabled in config. At least one additional workspace is configured.\n\n**Algorithm:**\n1. Read configured workspace list from config (explicit paths, no filesystem scanning)\n2. For each workspace (in configured order):\n   a. Check `.beads/` directory exists\n   b. Query `br ready --unassigned --json`\n   c. If candidates found, return them with workspace context\n3. If no workspace has work, return `NoWork`\n\n**Exit conditions:**\n| Result | Action |\n|--------|--------|\n| Candidates found in another workspace | Return `BeadFound(candidates)` with workspace override |\n| No candidates in any workspace | Return `NoWork` → fall through to Strand 4 |\n\n**Design notes (from `docs/notes/explore-strand-bugs.md`):**\n- **No filesystem scanning.** NEEDLE-deprecated's `find`-based discovery caused 35+ CPU load with 40 workers. Workspaces must be explicitly configured.\n- **No upward traversal.** The v1 explore strand walked up parent directories to `/home`, then `/`. This is eliminated.\n- **Workspace list is static** for the duration of a session. It is read from config at boot and not re-evaluated.\n- **Workers do not permanently relocate.** If a worker finds work in another workspace, it processes that bead and returns to its home workspace for the next cycle.\n\n## Strand 4: Weave (opt-in)\n\n**Purpose:** Analyze workspace documentation for gaps and create new beads to address them.\n\n**Invokes agent:** Yes — uses the agent to analyze documentation and propose beads.\n\n**Entry condition:** Strands 1-3 (Pluck, Mend, Explore) returned no work. Weave is explicitly enabled in workspace config (`strands.weave.enabled: true`).\n\n**Algorithm:**\n1. Identify documentation files (README, AGENTS.md, docs/, etc.)\n2. Dispatch agent with gap-analysis prompt\n3. Agent proposes new beads (as structured output)\n4. Create beads via bead store\n5. Return `WorkCreated` → restart from Strand 1\n\n**Guardrails (from `docs/notes/self-modification-risks.md`):**\n- **Max beads per weave run:** Configurable, default 5. Prevents unbounded bead creation.\n- **Cooldown period:** Minimum time between weave runs per workspace, default 24h.\n- **Seen-issues deduplication:** Track previously created weave beads to prevent duplicates.\n- **Workspace exclusion:** Weave is disabled for NEEDLE's own workspace by default. Workers must not create work for their own orchestrator without human approval.\n- **Human review label:** Weave-created beads are labeled `weave-generated` for easy filtering.\n\n**Exit conditions:**\n| Result | Action |\n|--------|--------|\n| Beads created | Return `WorkCreated` → restart from Strand 1 |\n| No gaps found | Return `NoWork` → fall through to Strand 5 |\n| Disabled | Return `NoWork` → fall through to Strand 5 |\n\n## Strand 5: Unravel (opt-in)\n\n**Purpose:** For beads labeled `human` (requiring human decision), propose alternative approaches that an agent could execute instead.\n\n**Invokes agent:** Yes — uses the agent to analyze the blocked bead and propose workarounds.\n\n**Entry condition:** Strands 1-4 returned no work. Unravel is explicitly enabled. There are beads with `human` label in the workspace.\n\n**Algorithm:**\n1. Query beads with `human` label\n2. For each (up to `max_unravel_per_run`, default 3):\n   a. Dispatch agent with the bead context and a prompt asking for alternative approaches\n   b. If agent proposes viable alternatives, create child beads with `alternative` label\n   c. Do NOT close or modify the original `human` bead\n3. Return `WorkCreated` if alternatives were created\n\n**Guardrails:**\n- Original `human` bead is never modified or closed\n- Alternative beads are linked as children (informational, not blocking)\n- Max alternatives per `human` bead: configurable, default 2\n- Cooldown: don't re-analyze a `human` bead that was analyzed within the last 7 days\n\n**Exit conditions:**\n| Result | Action |\n|--------|--------|\n| Alternatives created | Return `WorkCreated` → restart from Strand 1 |\n| No `human` beads or no alternatives viable | Return `NoWork` → fall through to Strand 6 |\n| Disabled | Return `NoWork` → fall through to Strand 6 |\n\n## Strand 6: Pulse (opt-in)\n\n**Purpose:** Scan the codebase for health issues (stale TODOs, missing tests, dependency drift, linting) and create beads for significant findings.\n\n**Invokes agent:** Yes — uses the agent (or external tools) to scan the codebase.\n\n**Entry condition:** Strands 1-5 returned no work. Pulse is explicitly enabled. 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Read available traces for failed beads to capture failure patterns.\n1091\t3. **Consolidate:**\n1092\t   - Extract retrospective blocks from close bodies\n1093\t   - Identify patterns across multiple beads (same failure mode, same codebase quirk, workaround that works)\n1094\t   - Merge new learnings into `.beads/learnings.md`, deduplicating against existing entries\n1095\t   - Convert relative references to absolute (bead IDs, dates)\n1096\t   - If a learning appears 3+ times across different beads, promote to a skill file in `.beads/skills/`\n1097\t   - If a learning contradicts an existing entry, resolve in favor of the newer evidence\n1098\t4. **Prune:**\n1099\t   - Remove entries older than 90 days without reinforcement\n1100\t   - Compress similar entries into single entries\n1101\t   - Ensure total learnings stay under 80 entries (configurable)\n1102\t\n1103\t**Guardrails:**\n1104\t- **Cooldown:** Minimum 24 hours between consolidation runs (configurable)\n1105\t- **Max learnings created per run:** 10 (configurable)\n1106\t- **Max skills promoted per run:** 3 (configurable)\n1107\t- **Read-only on CLAUDE.md:** The consolidation agent receives the workspace CLAUDE.md as context but MUST NOT modify it. CLAUDE.md changes require explicit human approval.\n1108\t- **Workspace exclusion:** Reflect is disabled for NEEDLE's own workspace by default. Workers must not modify their own orchestrator's knowledge base without human approval.\n1109\t\n1110\t**Exit conditions:**\n1111\t| Result | Action |\n1112\t|--------|--------|\n1113\t| Consolidation performed | Return `WorkCreated` → restart from Strand 1 (learnings may unblock new work) |\n1114\t| Not enough data since last run | Return `NoWork` → fall through to Strand 8 |\n1115\t| Disabled or cooldown active | Return `NoWork` → fall through to Strand 8 |\n1116\t\n1117\t**Telemetry:**\n1118\t| Event Type | Emitted When | Data Fields |\n1119\t|------------|-------------|-------------|\n1120\t| `reflect.started` | Consolidation starts | `beads_since_last`, `current_learnings_count` |\n1121\t| `reflect.consolidated` | Consolidation completes | `learnings_added`, `learnings_pruned`, `skills_promoted`, `contradictions_resolved` |\n1122\t| `reflect.skipped` | Consolidation skipped | `reason` (cooldown, insufficient data, disabled) |\n1123\t\n1124\t**Learning persistence:** `.beads/learnings.md` is the authoritative source. Workers automatically append it to `context_files` during prompt building (via the Config module's `context_files` discovery). No manual config required — workers always see the latest learnings.\n1125\t\n1126\t**Session transcript analysis:** Reflect analyzes both bead close bodies (structured outcomes) and Claude Code session transcripts (decision-making process) when available. Transcripts are stored as JSONL in `.claude/projects/<project-hash>/<session-uuid>.jsonl` and contain richer signal: failed attempts, tool call sequences, recovery strategies, and decision points.\n1127\t\n1128\t**Integration with prompt building:** If `.beads/learnings.md` exists in a workspace, NEEDLE automatically appends it to `context_files` during prompt building. Workers always see the latest learnings without manual configuration.\n1129\t\n1130\t## Strand 8: Splice\n1131\t\n1132\t**Purpose:** Document worker failures (crashed workers and live-but-looping workers) by creating failure beads in a configured report workspace.\n1133\t\n1134\t**Invokes agent:** No.\n1135\t\n1136\t**Entry condition:** Strand 7 returned no work. Splice is enabled in config (default: true). Heartbeat files exist in the heartbeat directory.\n1137\t\n1138\t**Algorithm:**\n1139\t\n1140\t1. **Scan for dead workers (stale heartbeat + dead tmux session):**\n1141\t   - Read all heartbeat files from the heartbeat directory\n1142\t   - For each heartbeat older than `stale_threshold_secs` (default: 300s):\n1143\t     - Check if the tmux session is still alive\n1144\t     - If session is dead, this is a failed worker\n1145\t\n1146\t2. **Scan for live-but-looping workers (optional, when `detect_live_loops: true`):**\n1147\t   - For each worker with a fresh heartbeat:\n1148\t     - Read the tail of their JSONL log file\n1149\t     - Detect three loop patterns:\n1150\t       - **Claim churn:** Repeated `bead.claim.race_lost` events for the same bead\n1151\t       - **State ping-pong:** Rapid cycling between a small set of states without forward progress\n1152\t       - **Log runaway:** Excessive JSONL growth without `agent.completed` events\n1153\t\n1154\t3. **Create failure beads:**\n1155\t   - For each undocumented failure or loop pattern:\n1156\t     - Create a bead in the configured `report_workspace`\n1157\t     - Include worker details, session info, and evidence in the bead body\n1158\t   - Track documented sessions/loops in `splice_state.json` to prevent duplicates\n1159\t\n1160\t4. **Return `WorkCreated` if any beads were created, otherwise `NoWork`**\n1161\t\n1162\t**Exit conditions:**\n1163\t| Result | Action |\n1164\t|--------|--------|\n1165\t| Failure beads created | Return `WorkCreated` → restart from Strand 1 |\n1166\t| No new failures detected | Return `NoWork` → fall through to Strand 9 |\n1167\t\n1168\t**State persistence:** `splice_state.json` tracks which session IDs and loop patterns have already been documented, preventing duplicate failure beads for the same dead/looping worker.\n1169\t\n1170\t**Loop detection thresholds:**\n1171\t- `claim_churn_threshold`: Number of race-lost events for same bead before flagging (default: 20)\n1172\t- `log_runaway_bytes`: Max JSONL growth in `live_loop_window_secs` without completion (default: 10 MiB)\n1173\t- `live_loop_window_secs`: Time window for log runaway check (default: 300s)\n1174\t\n1175\t## Strand 9: Knot\n1176\t\n1177\t**Purpose:** All work-finding strategies are exhausted. Alert the human and enter backoff.\n1178\t\n1179\t**Invokes agent:** No.\n1180\t\n1181\t**Entry condition:** Strands 1-8 all returned `NoWork`.\n1182\t\n1183\t**Algorithm:**\n1184\t1. Determine alert state:\n1185\t   - **First time exhausted:** Emit `worker.idle` telemetry. Start backoff timer.\n1186\t   - **Repeated exhaustion (>N cycles):** Create alert bead (if not already created within cooldown).\n1187\t2. Verify before alerting (three-state check):\n1188\t   a. **No beads exist:** Queue is genuinely empty. Normal idle.\n1189\t   b. **All beads claimed:** Other workers are busy. Normal contention. Wait.\n1190\t   c. **Beads invisible:** Configuration error (wrong workspace, broken filter). Alert.\n1191\t3. Return `NoWork` → worker enters EXHAUSTED state with backoff\n1192\t\n1193\t**Guardrails (from `docs/notes/worker-starvation-lessons.md`):**\n1194\t- **Verify independently before alerting.** The v1 system had 100% false positive rate because it used the same broken code path for verification.\n1195\t- **Three-state model.** \"No work\" is three different conditions with different responses. Conflating them caused the false positive spiral.\n1196\t- **Rate limit alerts:** Max 1 alert bead per workspace per hour.\n1197\t- **Alert includes diagnostics:** Bead counts, worker count, claimed count, config snapshot.\n1198\t\n1199\t**Exit conditions:**\n1200\t| Result | Action |\n1201\t|--------|--------|\n1202\t| Always | Return `NoWork` → EXHAUSTED state |\n1203\t\n1204\t## Strand Configuration\n1205\t\n1206\t```yaml\n1207\t# ~/.needle/config.yaml or .needle.yaml\n1208\tstrands:\n1209\t  pluck:\n1210\t    enabled: true           # always on, cannot be disabled\n1211\t  explore:\n1212\t    enabled: true\n1213\t    workspaces:             # explicit list, no auto-discovery\n1214\t      - /home/coder/project-a\n1215\t      - /home/coder/project-b\n1216\t  mend:\n1217\t    enabled: true\n1218\t    stale_claim_ttl: 300    # seconds before a claimed bead is considered stale\n1219\t    lock_ttl: 600           # seconds before an orphaned lock is removed\n1220\t  weave:\n1221\t    enabled: false          # opt-in\n1222\t    max_beads_per_run: 5\n1223\t    cooldown_hours: 24\n1224\t    exclude_workspaces: []  # workspaces where weave is forbidden\n1225\t  unravel:\n1226\t    enabled: false          # opt-in\n1227\t    max_per_run: 3\n1228\t    cooldown_days: 7\n1229\t  pulse:\n1230\t    enabled: false          # opt-in\n1231\t    max_beads_per_run: 10\n1232\t    cooldown_hours: 48\n1233\t    severity_threshold: warning\n1234\t    scanners:\n1235\t      - name: todo-scanner\n1236\t        command: \"grep -rn 'TODO\\\\|FIXME' {workspace}/src\"\n1237\t      - name: test-coverage\n1238\t        command: \"cargo tarpaulin --skip-clean -o json\"\n1239\t  reflect:\n1240\t    enabled: true           # on by default (unlike weave/unravel/pulse)\n1241\t    min_beads_since_last: 10   # minimum closed beads before consolidation\n1242\t    cooldown_hours: 24\n1243\t    max_learnings_per_run: 10\n1244\t    max_skills_per_run: 3\n1245\t    learning_retention_days: 90\n1246\t    max_learnings: 80\n1247\t  splice:\n1248\t    enabled: true           # always on, cannot be disabled\n1249\t    stale_threshold_secs: 300   # seconds before heartbeat considered stale\n1250\t    report_workspace: null      # workspace for failure beads (null = current store)\n1251\t    detect_live_loops: true     # scan for stuck workers in JSONL tail\n1252\t    live_loop_scan_events: 200  # max events to scan per worker\n1253\t    claim_churn_threshold: 20   # race-lost events for same bead before flagging\n1254\t    log_runaway_bytes: 10485760 # 10 MiB, max growth without completion\n1255\t    live_loop_window_secs: 300   # time window for log runaway check\n1256\t  knot:\n1257\t    enabled: true           # always on, cannot be disabled\n1258\t    alert_cooldown_minutes: 60\n1259\t    exhaustion_threshold: 3 # cycles before creating alert bead\n1260\t```\n1261\t\n1262\t---\n1263\t\n1264\t# Mitosis\n1265\t\n1266\tMitosis is NEEDLE's mechanism for splitting a bead that represents multiple tasks into smaller, focused child beads. It is triggered on failure — when a bead fails execution, NEEDLE evaluates whether it should be decomposed before retrying.\n1267\t\n1268\t## Split Criteria\n1269\t"}]},"parent_tool_use_id":null,"session_id":"72539a33-4a3d-4268-95e8-c3da33ecc3f7","uuid":"350a48b4-43db-4179-a99a-dda20597c371","timestamp":"2026-05-30T15:28:52.274Z","tool_use_result":{"type":"text","file":{"filePath":"/home/coding/NEEDLE/docs/plan/plan.md","content":"- **Workspace exclusion:** Same as Weave — disabled for NEEDLE's own workspace by default\n\n**Exit conditions:**\n| Result | Action |\n|--------|--------|\n| Beads created | Return `WorkCreated` → restart from Strand 1 |\n| No new issues | Return `NoWork` → fall through to Strand 7 |\n| Disabled | Return `NoWork` → fall through to Strand 7 |\n\n## Strand 7: Reflect (opt-in)\n\n**Purpose:** Consolidate learnings from recent bead work into a shared knowledge base (`.beads/learnings.md`), promoting recurring patterns to reusable skill files. This meta-analysis strand ensures that insights from completed work are captured and made available to future work.\n\n**Invokes agent:** Yes — uses a consolidation-specific prompt.\n\n**Entry condition:** Strands 1-6 returned no work. Reflect is explicitly enabled in workspace config (`strands.reflect.enabled: true`). At least N beads have been closed since last consolidation (configurable, default: 10). At least T hours since last consolidation (configurable, default: 24).\n\n**Algorithm (KAIROS-inspired four-phase cycle):**\n\n1. **Orient:** Read current `.beads/learnings.md` and existing skill files in `.beads/skills/`. Check file sizes to ensure they're within bounds.\n2. **Gather:** Read bead close bodies from `.beads/issues.jsonl` for beads closed since last consolidation. Read available traces for failed beads to capture failure patterns.\n3. **Consolidate:**\n   - Extract retrospective blocks from close bodies\n   - Identify patterns across multiple beads (same failure mode, same codebase quirk, workaround that works)\n   - Merge new learnings into `.beads/learnings.md`, deduplicating against existing entries\n   - Convert relative references to absolute (bead IDs, dates)\n   - If a learning appears 3+ times across different beads, promote to a skill file in `.beads/skills/`\n   - If a learning contradicts an existing entry, resolve in favor of the newer evidence\n4. **Prune:**\n   - Remove entries older than 90 days without reinforcement\n   - Compress similar entries into single entries\n   - Ensure total learnings stay under 80 entries (configurable)\n\n**Guardrails:**\n- **Cooldown:** Minimum 24 hours between consolidation runs (configurable)\n- **Max learnings created per run:** 10 (configurable)\n- **Max skills promoted per run:** 3 (configurable)\n- **Read-only on CLAUDE.md:** The consolidation agent receives the workspace CLAUDE.md as context but MUST NOT modify it. CLAUDE.md changes require explicit human approval.\n- **Workspace exclusion:** Reflect is disabled for NEEDLE's own workspace by default. Workers must not modify their own orchestrator's knowledge base without human approval.\n\n**Exit conditions:**\n| Result | Action |\n|--------|--------|\n| Consolidation performed | Return `WorkCreated` → restart from Strand 1 (learnings may unblock new work) |\n| Not enough data since last run | Return `NoWork` → fall through to Strand 8 |\n| Disabled or cooldown active | Return `NoWork` → fall through to Strand 8 |\n\n**Telemetry:**\n| Event Type | Emitted When | Data Fields |\n|------------|-------------|-------------|\n| `reflect.started` | Consolidation starts | `beads_since_last`, `current_learnings_count` |\n| `reflect.consolidated` | Consolidation completes | `learnings_added`, `learnings_pruned`, `skills_promoted`, `contradictions_resolved` |\n| `reflect.skipped` | Consolidation skipped | `reason` (cooldown, insufficient data, disabled) |\n\n**Learning persistence:** `.beads/learnings.md` is the authoritative source. Workers automatically append it to `context_files` during prompt building (via the Config module's `context_files` discovery). No manual config required — workers always see the latest learnings.\n\n**Session transcript analysis:** Reflect analyzes both bead close bodies (structured outcomes) and Claude Code session transcripts (decision-making process) when available. Transcripts are stored as JSONL in `.claude/projects/<project-hash>/<session-uuid>.jsonl` and contain richer signal: failed attempts, tool call sequences, recovery strategies, and decision points.\n\n**Integration with prompt building:** If `.beads/learnings.md` exists in a workspace, NEEDLE automatically appends it to `context_files` during prompt building. Workers always see the latest learnings without manual configuration.\n\n## Strand 8: Splice\n\n**Purpose:** Document worker failures (crashed workers and live-but-looping workers) by creating failure beads in a configured report workspace.\n\n**Invokes agent:** No.\n\n**Entry condition:** Strand 7 returned no work. Splice is enabled in config (default: true). Heartbeat files exist in the heartbeat directory.\n\n**Algorithm:**\n\n1. **Scan for dead workers (stale heartbeat + dead tmux session):**\n   - Read all heartbeat files from the heartbeat directory\n   - For each heartbeat older than `stale_threshold_secs` (default: 300s):\n     - Check if the tmux session is still alive\n     - If session is dead, this is a failed worker\n\n2. **Scan for live-but-looping workers (optional, when `detect_live_loops: true`):**\n   - For each worker with a fresh heartbeat:\n     - Read the tail of their JSONL log file\n     - Detect three loop patterns:\n       - **Claim churn:** Repeated `bead.claim.race_lost` events for the same bead\n       - **State ping-pong:** Rapid cycling between a small set of states without forward progress\n       - **Log runaway:** Excessive JSONL growth without `agent.completed` events\n\n3. **Create failure beads:**\n   - For each undocumented failure or loop pattern:\n     - Create a bead in the configured `report_workspace`\n     - Include worker details, session info, and evidence in the bead body\n   - Track documented sessions/loops in `splice_state.json` to prevent duplicates\n\n4. **Return `WorkCreated` if any beads were created, otherwise `NoWork`**\n\n**Exit conditions:**\n| Result | Action |\n|--------|--------|\n| Failure beads created | Return `WorkCreated` → restart from Strand 1 |\n| No new failures detected | Return `NoWork` → fall through to Strand 9 |\n\n**State persistence:** `splice_state.json` tracks which session IDs and loop patterns have already been documented, preventing duplicate failure beads for the same dead/looping worker.\n\n**Loop detection thresholds:**\n- `claim_churn_threshold`: Number of race-lost events for same bead before flagging (default: 20)\n- `log_runaway_bytes`: Max JSONL growth in `live_loop_window_secs` without completion (default: 10 MiB)\n- `live_loop_window_secs`: Time window for log runaway check (default: 300s)\n\n## Strand 9: Knot\n\n**Purpose:** All work-finding strategies are exhausted. Alert the human and enter backoff.\n\n**Invokes agent:** No.\n\n**Entry condition:** Strands 1-8 all returned `NoWork`.\n\n**Algorithm:**\n1. Determine alert state:\n   - **First time exhausted:** Emit `worker.idle` telemetry. Start backoff timer.\n   - **Repeated exhaustion (>N cycles):** Create alert bead (if not already created within cooldown).\n2. Verify before alerting (three-state check):\n   a. **No beads exist:** Queue is genuinely empty. Normal idle.\n   b. **All beads claimed:** Other workers are busy. Normal contention. Wait.\n   c. **Beads invisible:** Configuration error (wrong workspace, broken filter). Alert.\n3. Return `NoWork` → worker enters EXHAUSTED state with backoff\n\n**Guardrails (from `docs/notes/worker-starvation-lessons.md`):**\n- **Verify independently before alerting.** The v1 system had 100% false positive rate because it used the same broken code path for verification.\n- **Three-state model.** \"No work\" is three different conditions with different responses. Conflating them caused the false positive spiral.\n- **Rate limit alerts:** Max 1 alert bead per workspace per hour.\n- **Alert includes diagnostics:** Bead counts, worker count, claimed count, config snapshot.\n\n**Exit conditions:**\n| Result | Action |\n|--------|--------|\n| Always | Return `NoWork` → EXHAUSTED state |\n\n## Strand Configuration\n\n```yaml\n# ~/.needle/config.yaml or .needle.yaml\nstrands:\n  pluck:\n    enabled: true           # always on, cannot be disabled\n  explore:\n    enabled: true\n    workspaces:             # explicit list, no auto-discovery\n      - /home/coder/project-a\n      - /home/coder/project-b\n  mend:\n    enabled: true\n    stale_claim_ttl: 300    # seconds before a claimed bead is considered stale\n    lock_ttl: 600           # seconds before an orphaned lock is removed\n  weave:\n    enabled: false          # opt-in\n    max_beads_per_run: 5\n    cooldown_hours: 24\n    exclude_workspaces: []  # workspaces where weave is forbidden\n  unravel:\n    enabled: false          # opt-in\n    max_per_run: 3\n    cooldown_days: 7\n  pulse:\n    enabled: false          # opt-in\n    max_beads_per_run: 10\n    cooldown_hours: 48\n    severity_threshold: warning\n    scanners:\n      - name: todo-scanner\n        command: \"grep -rn 'TODO\\\\|FIXME' {workspace}/src\"\n      - name: test-coverage\n        command: \"cargo tarpaulin --skip-clean -o json\"\n  reflect:\n    enabled: true           # on by default (unlike weave/unravel/pulse)\n    min_beads_since_last: 10   # minimum closed beads before consolidation\n    cooldown_hours: 24\n    max_learnings_per_run: 10\n    max_skills_per_run: 3\n    learning_retention_days: 90\n    max_learnings: 80\n  splice:\n    enabled: true           # always on, cannot be disabled\n    stale_threshold_secs: 300   # seconds before heartbeat considered stale\n    report_workspace: null      # workspace for failure beads (null = current store)\n    detect_live_loops: true     # scan for stuck workers in JSONL tail\n    live_loop_scan_events: 200  # max events to scan per worker\n    claim_churn_threshold: 20   # race-lost events for same bead before flagging\n    log_runaway_bytes: 10485760 # 10 MiB, max growth without completion\n    live_loop_window_secs: 300   # time window for log runaway check\n  knot:\n    enabled: true           # always on, cannot be disabled\n    alert_cooldown_minutes: 60\n    exhaustion_threshold: 3 # cycles before creating alert bead\n```\n\n---\n\n# Mitosis\n\nMitosis is NEEDLE's mechanism for splitting a bead that represents multiple tasks into smaller, focused child beads. It is triggered on failure — when a bead fails execution, NEEDLE evaluates whether it should be decomposed before retrying.\n\n## Split Criteria\n","numLines":200,"startLine":1070,"totalLines":3828}}}
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Creates a single bead in a real `br` workspace\\n  2. Spawns N Tokio tasks, each running through the `Claimer::claim_next()` path\\n  3. Asserts exactly 1 task receives `ClaimOutcome::Claimed`, the rest receive `ClaimOutcome::AllRaceLost` or `ClaimOutcome::NoCandidates`\\n- Property should be parameterized over N (2..=20 workers)\\n- Must use real flock via `fs2` (no mocking)\\n\\n## Acceptance Criteria\\n- [ ] Test passes consistently under `cargo test --features integration` with real `br` binary\\n- [ ] N=2, N=5, N=20 all assert exactly 1 success\\n- [ ] Test is documented with 'Property 3 (true concurrent)' comment\",\"design\":\"\",\"acceptance_criteria\":\"\",\"notes\":\"\",\"status\":\"in_progress\",\"priority\":3,\"issue_type\":\"task\",\"assignee\":\"claude-code-glm-4.7-bravo\",\"created_at\":\"2026-05-26T04:03:41.131228540Z\",\"updated_at\":\"2026-05-30T14:55:51.276713543Z\",\"source_repo\":\".\",\"compaction_level\":0}\n{\"id\":\"bf-5pk\",\"title\":\"Add needle init subcommand for v1→v2 migration and config bootstrapping\",\"description\":\"The plan (Migration section, Step 4) specifies `needle init` as the command users run to create a v2 config. 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Prints a summary of what was created/migrated\\n- Help text should match the plan's migration step 4\\n\\n## Acceptance Criteria\\n- [ ] `needle init` creates `~/.needle/config.yaml` when none exists\\n- [ ] `needle init` detects v1 artifacts and migrates compatible settings\\n- [ ] `needle init` is idempotent (safe to run on already-initialized installs)\\n- [ ] `needle --help` lists `init` in the Commands section\",\"design\":\"\",\"acceptance_criteria\":\"\",\"notes\":\"\",\"status\":\"in_progress\",\"priority\":3,\"issue_type\":\"task\",\"assignee\":\"claude-code-glm-4.7-delta\",\"created_at\":\"2026-05-26T04:03:18.329199368Z\",\"updated_at\":\"2026-05-30T15:21:04.056768501Z\",\"source_repo\":\".\",\"compaction_level\":0}\n{\"id\":\"bf-5q7\",\"title\":\"Document Splice strand and commit-trailer injection in plan.md\",\"description\":\"Two significant features exist in code that are absent from `docs/plan/plan.md`:\\n\\n1. **Splice strand** (`src/strand/splice.rs`, ~1074 LOC) — a strand that documents worker failures. Not described anywhere in the plan's Strand Waterfall section, which defines strands 1-7 (Pluck, Mend, Explore, Weave, Unravel, Pulse, Knot) + Reflect (Phase 4). Splice is numbered and sequenced but not in the plan.\\n\\n2. **Commit-trailer injection** (`src/commit_hook.rs`, ~164 LOC) — NEEDLE amends the latest commit to add a `Bead-Id: <id>` trailer after successful bead close, for HOOP bead_commit_index integration. This feature is not mentioned anywhere in the plan.\\n\\nBoth features are implemented, tested, and in production. The plan is the authoritative specification — it should be updated to document these features so future workers understand why they exist.\\n\\n## Deliverables\\n- Add a **Strand 8: Splice** section to the Strand Waterfall chapter in `docs/plan/plan.md`\\n  - Purpose, entry conditions, algorithm, exit conditions, guardrails\\n  - Its position in the waterfall (where it fits relative to Knot/Reflect)\\n- Add a **Commit Trailer Injection** section to the Architecture chapter or Agent Adapters chapter\\n  - Describe the `Bead-Id:` trailer format\\n  - Describe when it fires (success + commits detected)\\n  - Describe the HOOP integration context\\n- Update the module boundary table to include `commit_hook` and `strand/splice`\\n\\n## Acceptance Criteria\\n- [ ] Plan accurately describes Splice strand algorithm and position in waterfall\\n- [ ] Plan accurately describes commit-trailer injection trigger and format\\n- [ ] No code features are undocumented in the plan\",\"design\":\"\",\"acceptance_criteria\":\"\",\"notes\":\"\",\"status\":\"in_progress\",\"priority\":3,\"issue_type\":\"task\",\"assignee\":\"claude-code-glm-4.7-alpha\",\"created_at\":\"2026-05-26T04:03:53.510629174Z\",\"updated_at\":\"2026-05-30T15:27:46.334822247Z\",\"source_repo\":\".\",\"compaction_level\":0}\n{\"id\":\"bf-6cs\",\"title\":\"Emit structured fleet.cpu_saturated and fleet.memory_low telemetry events\",\"description\":\"The plan specifies (Concurrency section, Fleet Sizing) that NEEDLE emits a `fleet.cpu_saturated` event when system load exceeds `cpu_load_warn` threshold, and implies a corresponding memory warning event.\\n\\nCurrently `check_system_resources()` in `src/rate_limit/mod.rs` uses `tracing::warn!` log macros rather than structured telemetry events. This violates design principle 4 (Observable by default: every state transition emits structured telemetry) and the plan's event catalog is incomplete without these events.\\n\\n## Deliverables\\n- Add `FleetCpuSaturated { load_average: f64, threshold: f64, core_count: usize }` variant to `EventKind` in `src/telemetry/mod.rs`\\n- Add `FleetMemoryLow { free_mb: u64, threshold_mb: u64 }` variant to `EventKind`\\n- Update `check_system_resources()` in `src/rate_limit/mod.rs` to accept a `&Telemetry` sink and emit these events instead of (or in addition to) the tracing log\\n- Update call sites in `src/worker/mod.rs` to pass the telemetry sink\\n- Add the two event types to the telemetry documentation in `docs/plan/plan.md` (Health event catalog)\\n\\n## Acceptance Criteria\\n- [ ] `fleet.cpu_saturated` event appears in JSONL log when load exceeds threshold\\n- [ ] `fleet.memory_low` event appears in JSONL log when free RAM drops below threshold\\n- [ ] Both events carry the numeric values (actual vs threshold) in their `data` field\\n- [ ] Events are exported via OTLP sink (severity WARN)\",\"design\":\"\",\"acceptance_criteria\":\"\",\"notes\":\"\",\"status\":\"in_progress\",\"priority\":3,\"issue_type\":\"task\",\"assignee\":\"claude-code-glm-4.7-delta\",\"created_at\":\"2026-05-26T04:03:29.036839104Z\",\"updated_at\":\"2026-05-30T14:48:06.995718777Z\",\"source_repo\":\".\",\"compaction_level\":0}\n{\"id\":\"bf-x1r\",\"title\":\"Add trace sanitization performance benchmark (Phase 4 success criterion)\",\"description\":\"Phase 4 success criteria include: 'Keyword pre-filter (Aho-Corasick) skips irrelevant rules; sanitization adds <10ms per trace file.'\\n\\nThere is currently no benchmark or test that measures sanitization latency. The 222-rule gitleaks scan plus Aho-Corasick pre-filter is on the critical write path (runs synchronously before trace write) and must stay under 10ms per trace file.\\n\\n## Deliverables\\n- Add a Criterion benchmark in `benches/sanitize.rs` (or equivalent) that:\\n  1. Generates representative trace file content (10KB, 100KB, 1MB) of simulated agent output\\n  2. Runs the sanitizer pipeline (keyword pre-filter → regex → entropy check) on each\\n  3. Reports throughput and latency\\n- Add an assertion-style test (not just benchmark) that fails if median latency for a 100KB trace exceeds 10ms on a single core\\n- The 10ms threshold should be configurable via environment variable for CI environments\\n\\n## Acceptance Criteria\\n- [ ] `cargo bench --bench sanitize` produces latency measurements\\n- [ ] A 100KB trace file sanitizes in <10ms median on modern hardware\\n- [ ] The Aho-Corasick keyword pre-filter demonstrably reduces candidate rules (benchmark shows skip rate)\\n- [ ] CI runs the assertion-style test (not full criterion benchmark, which is expensive)\",\"design\":\"\",\"acceptance_criteria\":\"\",\"notes\":\"\",\"status\":\"in_progress\",\"priority\":3,\"issue_type\":\"task\",\"assignee\":\"claude-code-glm-4.7-bravo\",\"created_at\":\"2026-05-26T04:04:04.151923815Z\",\"updated_at\":\"2026-05-30T15:26:02.673016636Z\",\"source_repo\":\".\",\"compaction_level\":0}","is_error":false}]},"parent_tool_use_id":null,"session_id":"72539a33-4a3d-4268-95e8-c3da33ecc3f7","uuid":"721509c1-dfac-4bba-a32d-628803a4b24a","timestamp":"2026-05-30T15:31:39.168Z","tool_use_result":{"stdout":"{\"id\":\"bf-4hq\",\"title\":\"Add real concurrent claim exclusivity property test using actual flock\",\"description\":\"The plan (Test Strategy, Property Tests) specifies: 'Claim Exclusivity: Given N concurrent claim attempts on 1 bead, exactly 1 succeeds.'\\n\\nThe current test in `tests/property_tests.rs` (Property 3) explicitly acknowledges it only tests the structural exclusion set property — not actual concurrent locking. The comment reads: 'We can't easily test concurrent claiming without a real bead store, but we CAN verify the structural property.'\\n\\nThis is a gap. The plan requires a test that actually exercises the flock-based serialization with N goroutine-equivalent workers racing to claim the same bead.\\n\\n## Deliverables\\n- Add a new property test (or integration test in `tests/real_br_integration_tests.rs`) that:\\n  1. Creates a single bead in a real `br` workspace\\n  2. Spawns N Tokio tasks, each running through the `Claimer::claim_next()` path\\n  3. Asserts exactly 1 task receives `ClaimOutcome::Claimed`, the rest receive `ClaimOutcome::AllRaceLost` or `ClaimOutcome::NoCandidates`\\n- Property should be parameterized over N (2..=20 workers)\\n- Must use real flock via `fs2` (no mocking)\\n\\n## Acceptance Criteria\\n- [ ] Test passes consistently under `cargo test --features integration` with real `br` binary\\n- [ ] N=2, N=5, N=20 all assert exactly 1 success\\n- [ ] Test is documented with 'Property 3 (true concurrent)' comment\",\"design\":\"\",\"acceptance_criteria\":\"\",\"notes\":\"\",\"status\":\"in_progress\",\"priority\":3,\"issue_type\":\"task\",\"assignee\":\"claude-code-glm-4.7-bravo\",\"created_at\":\"2026-05-26T04:03:41.131228540Z\",\"updated_at\":\"2026-05-30T14:55:51.276713543Z\",\"source_repo\":\".\",\"compaction_level\":0}\n{\"id\":\"bf-5pk\",\"title\":\"Add needle init subcommand for v1→v2 migration and config bootstrapping\",\"description\":\"The plan (Migration section, Step 4) specifies `needle init` as the command users run to create a v2 config. It detects any compatible v1 settings and migrates them to the v2 YAML schema.\\n\\nCurrently missing from the CLI. All other migration steps work but there is no `needle init` command.\\n\\n## Deliverables\\n- Add `Init` variant to `CliCommand` enum in `src/cli/mod.rs`\\n- Implement `cmd_init()` that:\\n  1. Detects existing `~/.needle/` directory (v1 artifacts)\\n  2. If v1 config found, migrates compatible settings (agent name, workspace path, worker count) to v2 YAML schema\\n  3. If no v1 config, writes a commented default `~/.needle/config.yaml`\\n  4. Validates the resulting config by running it through `ConfigLoader`\\n  5. Prints a summary of what was created/migrated\\n- Help text should match the plan's migration step 4\\n\\n## Acceptance Criteria\\n- [ ] `needle init` creates `~/.needle/config.yaml` when none exists\\n- [ ] `needle init` detects v1 artifacts and migrates compatible settings\\n- [ ] `needle init` is idempotent (safe to run on already-initialized installs)\\n- [ ] `needle --help` lists `init` in the Commands section\",\"design\":\"\",\"acceptance_criteria\":\"\",\"notes\":\"\",\"status\":\"in_progress\",\"priority\":3,\"issue_type\":\"task\",\"assignee\":\"claude-code-glm-4.7-delta\",\"created_at\":\"2026-05-26T04:03:18.329199368Z\",\"updated_at\":\"2026-05-30T15:21:04.056768501Z\",\"source_repo\":\".\",\"compaction_level\":0}\n{\"id\":\"bf-5q7\",\"title\":\"Document Splice strand and commit-trailer injection in plan.md\",\"description\":\"Two significant features exist in code that are absent from `docs/plan/plan.md`:\\n\\n1. **Splice strand** (`src/strand/splice.rs`, ~1074 LOC) — a strand that documents worker failures. Not described anywhere in the plan's Strand Waterfall section, which defines strands 1-7 (Pluck, Mend, Explore, Weave, Unravel, Pulse, Knot) + Reflect (Phase 4). Splice is numbered and sequenced but not in the plan.\\n\\n2. **Commit-trailer injection** (`src/commit_hook.rs`, ~164 LOC) — NEEDLE amends the latest commit to add a `Bead-Id: <id>` trailer after successful bead close, for HOOP bead_commit_index integration. This feature is not mentioned anywhere in the plan.\\n\\nBoth features are implemented, tested, and in production. The plan is the authoritative specification — it should be updated to document these features so future workers understand why they exist.\\n\\n## Deliverables\\n- Add a **Strand 8: Splice** section to the Strand Waterfall chapter in `docs/plan/plan.md`\\n  - Purpose, entry conditions, algorithm, exit conditions, guardrails\\n  - Its position in the waterfall (where it fits relative to Knot/Reflect)\\n- Add a **Commit Trailer Injection** section to the Architecture chapter or Agent Adapters chapter\\n  - Describe the `Bead-Id:` trailer format\\n  - Describe when it fires (success + commits detected)\\n  - Describe the HOOP integration context\\n- Update the module boundary table to include `commit_hook` and `strand/splice`\\n\\n## Acceptance Criteria\\n- [ ] Plan accurately describes Splice strand algorithm and position in waterfall\\n- [ ] Plan accurately describes commit-trailer injection trigger and format\\n- [ ] No code features are undocumented in the plan\",\"design\":\"\",\"acceptance_criteria\":\"\",\"notes\":\"\",\"status\":\"in_progress\",\"priority\":3,\"issue_type\":\"task\",\"assignee\":\"claude-code-glm-4.7-alpha\",\"created_at\":\"2026-05-26T04:03:53.510629174Z\",\"updated_at\":\"2026-05-30T15:27:46.334822247Z\",\"source_repo\":\".\",\"compaction_level\":0}\n{\"id\":\"bf-6cs\",\"title\":\"Emit structured fleet.cpu_saturated and fleet.memory_low telemetry events\",\"description\":\"The plan specifies (Concurrency section, Fleet Sizing) that NEEDLE emits a `fleet.cpu_saturated` event when system load exceeds `cpu_load_warn` threshold, and implies a corresponding memory warning event.\\n\\nCurrently `check_system_resources()` in `src/rate_limit/mod.rs` uses `tracing::warn!` log macros rather than structured telemetry events. This violates design principle 4 (Observable by default: every state transition emits structured telemetry) and the plan's event catalog is incomplete without these events.\\n\\n## Deliverables\\n- Add `FleetCpuSaturated { load_average: f64, threshold: f64, core_count: usize }` variant to `EventKind` in `src/telemetry/mod.rs`\\n- Add `FleetMemoryLow { free_mb: u64, threshold_mb: u64 }` variant to `EventKind`\\n- Update `check_system_resources()` in `src/rate_limit/mod.rs` to accept a `&Telemetry` sink and emit these events instead of (or in addition to) the tracing log\\n- Update call sites in `src/worker/mod.rs` to pass the telemetry sink\\n- Add the two event types to the telemetry documentation in `docs/plan/plan.md` (Health event catalog)\\n\\n## Acceptance Criteria\\n- [ ] `fleet.cpu_saturated` event appears in JSONL log when load exceeds threshold\\n- [ ] `fleet.memory_low` event appears in JSONL log when free RAM drops below threshold\\n- [ ] Both events carry the numeric values (actual vs threshold) in their `data` field\\n- [ ] Events are exported via OTLP sink (severity WARN)\",\"design\":\"\",\"acceptance_criteria\":\"\",\"notes\":\"\",\"status\":\"in_progress\",\"priority\":3,\"issue_type\":\"task\",\"assignee\":\"claude-code-glm-4.7-delta\",\"created_at\":\"2026-05-26T04:03:29.036839104Z\",\"updated_at\":\"2026-05-30T14:48:06.995718777Z\",\"source_repo\":\".\",\"compaction_level\":0}\n{\"id\":\"bf-x1r\",\"title\":\"Add trace sanitization performance benchmark (Phase 4 success criterion)\",\"description\":\"Phase 4 success criteria include: 'Keyword pre-filter (Aho-Corasick) skips irrelevant rules; sanitization adds <10ms per trace file.'\\n\\nThere is currently no benchmark or test that measures sanitization latency. The 222-rule gitleaks scan plus Aho-Corasick pre-filter is on the critical write path (runs synchronously before trace write) and must stay under 10ms per trace file.\\n\\n## Deliverables\\n- Add a Criterion benchmark in `benches/sanitize.rs` (or equivalent) that:\\n  1. Generates representative trace file content (10KB, 100KB, 1MB) of simulated agent output\\n  2. Runs the sanitizer pipeline (keyword pre-filter → regex → entropy check) on each\\n  3. Reports throughput and latency\\n- Add an assertion-style test (not just benchmark) that fails if median latency for a 100KB trace exceeds 10ms on a single core\\n- The 10ms threshold should be configurable via environment variable for CI environments\\n\\n## Acceptance Criteria\\n- [ ] `cargo bench --bench sanitize` produces latency measurements\\n- [ ] A 100KB trace file sanitizes in <10ms median on modern hardware\\n- [ ] The Aho-Corasick keyword pre-filter demonstrably reduces candidate rules (benchmark shows skip rate)\\n- [ ] CI runs the assertion-style test (not full criterion benchmark, which is expensive)\",\"design\":\"\",\"acceptance_criteria\":\"\",\"notes\":\"\",\"status\":\"in_progress\",\"priority\":3,\"issue_type\":\"task\",\"assignee\":\"claude-code-glm-4.7-bravo\",\"created_at\":\"2026-05-26T04:04:04.151923815Z\",\"updated_at\":\"2026-05-30T15:26:02.673016636Z\",\"source_repo\":\".\",\"compaction_level\":0}","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false}}
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