# Performance Review Report

**Branch**: feat-135-custom-orchestrators -> main
**Date**: 2026-04-22T01:58

## Issues in Your Changes (BLOCKING)

_No blocking performance issues found._

## Issues in Code You Touched (Should Fix)

### MEDIUM

**Orphaned state files from custom orchestrators have no automatic cleanup** - `src/core/orchestrator-scaffold.ts:67`
**Confidence**: 85%
- Problem: `scaffoldCustomOrchestrator` creates state files and exit condition scripts in `~/.autobeat/orchestrator-state/` but does not register them in the orchestrations DB table (by design -- no orchestration row is created). The existing `cleanupOldOrchestrations` in `recovery-manager.ts:236` only cleans up files associated with DB-tracked orchestrations. Custom orchestrator files accumulate indefinitely unless users manually run `find ~/.autobeat/orchestrator-state -mtime +7 -delete` (documented in `docs/CUSTOM_ORCHESTRATORS.md:276`).
- Impact: Over time, each `beat orchestrate init` or `InitCustomOrchestrator` call leaves two files (~1-2KB each) that are never automatically reclaimed. For frequent users or automated systems, this constitutes unbounded disk growth -- a slow memory/storage leak pattern. The impact is LOW in practice (files are tiny) but the pattern is architecturally unsound.
- Fix: Extend `cleanupOldOrchestrations` to also scan for orphan state files in the state directory that are not referenced by any orchestration row and are older than the retention threshold. Alternatively, add a `--prune` flag to `beat orchestrate` that cleans up files older than N days. This is a follow-up item, not a merge blocker.

## Pre-existing Issues (Not Blocking)

### MEDIUM

**Synchronous file I/O in MCP server request path** - `src/core/orchestrator-state.ts:95-100`, `src/core/orchestrator-state.ts:129-141`
**Confidence**: 82%
- Problem: `writeStateFile` and `writeExitConditionScript` use `mkdirSync`, `writeFileSync`, and `renameSync` which block the Node.js event loop. These are called from `handleInitCustomOrchestrator` (new code) and `createOrchestration` (existing code) in the MCP server's request handler.
- Impact: For the tiny files involved (~200 bytes state file, ~150 bytes exit script), the blocking duration is negligible (sub-millisecond on SSD). This is a pre-existing pattern established by `orchestration-manager.ts:105-115` and follows the `configuration.ts` file I/O conventions documented in the codebase. Not a practical concern for current workloads.
- Note: This is a pre-existing architectural choice, not introduced by this PR. The new code correctly follows the established pattern. Flagged for awareness only.

## Suggestions (Lower Confidence)

- **String duplication between snippet builders and buildOrchestratorPrompt** - `src/services/orchestrator-prompt.ts:77-104` vs `src/services/orchestrator-prompt.ts:210-237` (Confidence: 65%) -- The WORKER MANAGEMENT, LOOP MANAGEMENT, and AGENT EVAL MODE text appears in both the exported `buildDelegationInstructions` and the inline `buildOrchestratorPrompt` template. The DECISION comment explicitly acknowledges this as intentional (no output drift risk). If the prompts are later unified, there is a minor memory optimization from deduplication, but current duplication has zero runtime performance cost since these are short-lived string literals generated per-call.

## Summary

| Category | CRITICAL | HIGH | MEDIUM | LOW |
|----------|----------|------|--------|-----|
| Blocking | 0 | 0 | 0 | - |
| Should Fix | - | 0 | 1 | - |
| Pre-existing | - | - | 1 | 0 |

**Performance Score**: 9/10
**Recommendation**: APPROVED

The new code introduces no meaningful performance regressions. All I/O operations follow established codebase patterns (synchronous file writes for tiny state files). The snippet builders are pure functions with no side effects or allocations beyond the returned strings. The orphaned-file accumulation concern is a minor architectural gap that warrants a follow-up cleanup mechanism but does not block merge.
