---
session_id: S-2026-0223-2204
timestamp: 2026-02-23T21:04:23Z
predecessor: S-2026-0223-2143
tasks_active: [T-245, T-256, T-257]
tasks_touched: [T-257, T-256, T-245, T-258, T-253, T-255, T-048, T-254, T-259]
tasks_completed: []
uncommitted_changes: 17
owner: claude-code
session_narrative: ""
---

# Session Handover: S-2026-0223-2204

## Where We Are

All 5 build tasks from T-254 inception (LLM Q&A) are implemented and committed. The "Ask a Question" feature is live on /search — retrieves 10 chunks via hybrid RRF, streams answers from qwen2.5-coder-32b via SSE with inline citations. T-256 and T-257 have human ACs pending (answer quality, streaming UX). Everything pushed to remote.

## Work in Progress

<!-- horizon: now -->

### T-256: "Ask endpoint — /search/ask with ollama SSE streaming"
- **Status:** work-completed, owner: human (horizon: now)
- **Last action:** Built `/search/ask` SSE endpoint in `web/ask.py` + discovery blueprint. Streams tokens from ollama with model fallback.
- **Next step:** Human verifies answer quality and streaming responsiveness
- **Blockers:** None
- **Insight:** qwen2.5-coder-32b takes ~5s TTFT + 4.8 tok/s. Model cold start adds ~20s first time.

### T-257: "Frontend — Ask Q&A section with htmx SSE streaming"
- **Status:** work-completed, owner: human (horizon: now)
- **Last action:** Built collapsible Ask section with EventSource streaming, inline [N] citations, Sources panel with clickable links
- **Next step:** Human verifies UX quality — streaming feel, markdown rendering, source panel layout
- **Blockers:** None
- **Insight:** Used vanilla JS EventSource instead of htmx SSE extension for finer control over token-by-token rendering

<!-- horizon: later -->

### T-245: "sqlite-vec embedding layer — semantic search for project knowledge"
- **Status:** work-completed, owner: human (horizon: later)
- **Last action:** Thread-safety fix applied (previous session)
- **Next step:** Human verifies semantic search finds content keyword search misses
- **Blockers:** None
- **Insight:** sqlite-vec needs `check_same_thread=False` for Flask threading

## 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. **Vanilla JS EventSource over htmx SSE extension for Ask UI**
   - Why: Need fine-grained control — token-by-token append, source panel rendering, error handling. htmx SSE extension replaces content rather than appending.
   - Alternatives rejected: htmx `hx-ext="sse"` — too coarse for streaming token display

2. **Single `web/ask.py` module for both T-256 and T-258**
   - Why: Model management and streaming are tightly coupled — splitting would create unnecessary indirection
   - Alternatives rejected: Separate model_manager.py — over-engineering for ~30 lines of model logic

## Things Tried That Failed

1. **curl to test SSE endpoint** — curl buffers by default, needed `-N` (no-buffer) flag and 90s timeout due to model cold start + generation time

## Open Questions / Blockers

1. Human ACs on T-256/T-257 — answer quality and streaming UX need human evaluation

## Gotchas / Warnings for Next Session

- qwen2.5-coder-32b cold start takes ~20s first query. Subsequent queries are faster (~5s TTFT).
- Flask template caching — restart server after template edits (`bin/watchtower.sh restart`)
- T-256 and T-257 are in `active/` with `owner: human` — human must check ACs and finalize

## Suggested First Action

Test the Ask Q&A feature at http://localhost:3000/search — open the "Ask a Question" section, ask a framework question, verify answer quality and citation accuracy. Then check human ACs on T-256 and T-257.

## Files Changed This Session

- Created: `web/ask.py`, `web/static/htmx-ext-sse.js`
- Modified: `web/embeddings.py` (rag_retrieve), `web/blueprints/discovery.py` (/search/ask endpoint), `web/templates/search.html` (Ask section), `web/templates/base.html` (SSE extension script tag)

## Recent Commits

- 265c8e3 T-257: Add Ask Q&A frontend with SSE streaming + source citations
- edd620c T-256: Add /search/ask SSE endpoint + T-258: Model management with fallback
- 96ba6e7 T-255: Add rag_retrieve() wrapper for RAG pipeline + T-259: Add htmx SSE extension
- 69333e7 T-012: Session handover S-2026-0223-2143
- 9b173c8 T-012: Fill handover S-2026-0223-2141

---

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

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