---
session_id: S-2026-0221-2344
timestamp: 2026-02-21T22:44:54Z
predecessor: S-2026-0221-2316
tasks_active: [T-200, T-220, T-227, T-230, T-233, T-237]
tasks_touched: [T-230, T-237, T-233, T-227, T-234, T-232, T-235, T-236, T-229, T-231, T-228]
tasks_completed: []
uncommitted_changes: 3
owner: claude-code
session_narrative: ""
---

# Session Handover: S-2026-0221-2344

## Where We Are

Completed T-237: Watchtower search now uses tantivy BM25 instead of grep — 832 docs indexed, ranked results with snippet highlighting across 7 categories. Also fixed the decision auto-capture template placeholder bug from T-236. Four tasks await human review at :3000.

## Work in Progress

<!-- horizon: now -->

### T-200: "Discovery layer design — pattern detection, omission finding, insight surfacing (T-194 Phase 4)"
- **Status:** captured (horizon: now)
- **Last action:** No work recent sessions
- **Next step:** Begin inception exploration
- **Blockers:** None
- **Insight:** None

### T-220: "Fabric component detail — inline source code viewer"
- **Status:** started-work (horizon: now)
- **Last action:** All agent ACs complete; verification passes
- **Next step:** Human review: dark theme contrast, collapsible section UX at :3000
- **Blockers:** Waiting on human ACs
- **Insight:** None

### T-227: "Fix fabric page — subsystem cards link to themselves, dropdown filters broken"
- **Status:** work-completed (horizon: now)
- **Last action:** Agent ACs passing
- **Next step:** Human review of filtered view quality
- **Blockers:** Waiting on human ACs
- **Insight:** None

### T-230: "Fix MEDIUM severity enforcement bypasses — B-009, B-012, integrity checks"
- **Status:** work-completed (horizon: now)
- **Last action:** Agent ACs passing
- **Next step:** Human review pending
- **Blockers:** Waiting on human ACs
- **Insight:** None

### T-233: "Improve fabric graph layout"
- **Status:** work-completed (horizon: now)
- **Last action:** 3 layout modes implemented (dagre TB, dagre LR, cose with parent detach)
- **Next step:** Human review of label readability at :3000/fabric/graph
- **Blockers:** Waiting on human ACs
- **Insight:** Cytoscape cose broken with compound nodes at scale; dagre works well

### T-237: "Add search infrastructure — tantivy BM25 for Watchtower, plan embedding layer"
- **Status:** work-completed (partial — human ACs pending)
- **Last action:** Agent ACs all pass; tantivy indexing 832 docs, BM25 ranked results with snippets
- **Next step:** Human review of search result quality at :3000/search
- **Blockers:** Waiting on human ACs
- **Insight:** en_stem tokenizer handles stemming; auto-rebuild on 60s staleness keeps index fresh

## Inception Phases

**1 inception task(s) pending decision** — run `fw inception status` for details.

## Gaps Register

**2 spec-reality gap(s) being watched** — see `.context/project/gaps.yaml`

- **G-004** [low]: Multi-agent collaboration untested
- **G-011** [low]: PostToolUse hooks are advisory-only — cannot block actions

Run `fw audit` to check if any trigger conditions are met.

## Decisions Made This Session

1. **Index in /tmp, not .context — ephemeral, rebuilt on demand**
   - Why: Index rebuilds in <1s for 832 docs; no need to persist or track in git
   - Alternatives rejected: `.context/search-index/` (git noise), in-memory only (lost on restart)

2. **en_stem tokenizer for title and body fields**
   - Why: English stemming handles "healing"/"healed"/"heals" correctly; raw tokenizer for path/category/task_id
   - Alternatives rejected: default (no stemming, worse recall)

## Things Tried That Failed

1. **`index_option="untokenized"` for tantivy fields** — Invalid parameter; valid options are basic/freq/position. Used `tokenizer_name="raw"` instead.
2. **`doc.get("field")` on tantivy Document** — No `get` method. Use `doc.get_first("field")` instead.

## Open Questions / Blockers

None

## Gotchas / Warnings for Next Session

- Flask template caching: must restart server after editing templates
- Tantivy index lives in `/tmp/fw-search-index/` — lost on reboot, auto-rebuilt on first search
- `fw search` CLI still uses grep — tantivy only wired into web UI. Could be a future improvement.

## Suggested First Action

Review human ACs on T-220/T-227/T-230/T-233/T-237 at :3000. Or start T-200 (discovery layer design inception).

## Files Changed This Session

- Created: `web/search.py` (tantivy search engine), `.fabric/components/web-search.yaml`
- Modified: `web/blueprints/discovery.py` (search route), `web/templates/search.html` (ranked results), `web/templates/base.html` (url_for rename), `agents/task-create/update-task.sh` (placeholder filter), `.context/project/decisions.yaml` (clean junk D-032)

## Recent Commits

- 93f42e7 T-237: Filter template placeholders from decision auto-capture, clean junk D-032
- 3f1da13 T-237: Fix decision auto-capture — filter template placeholders, clean junk D-032
- f4c84d8 T-237: Complete agent ACs — tantivy BM25 search, 832 docs indexed, human review pending
- 5707770 T-237: Register search component, check all acceptance criteria
- d0e07fc T-237: Replace grep search with tantivy BM25 — 831 docs indexed, ranked results with snippets

---

## Handover Quality Feedback (for next session to complete)

- Did this handover help? [ ]
- What was missing?
- What was unnecessary?
