---
phase: 35-ai-discussion-recorder
plan: "01"
subsystem: worker
tags: [discussion, recording, qa, stdlib, cli, atomic-write]
requires: []
provides:
  - record_session() function for AI-paper discussion recording
  - CLI subcommand for agent session recording
  - Atomic append-only JSON + Markdown output in ai/ directory
  - pf-paper.md prompt update with recording step
affects: [36-integration-verification]

tech-stack:
  added: []
  patterns:
    - "Atomic writes via tempfile.NamedTemporaryFile + os.replace()"
    - "Append-only session storage in canonical JSON envelope"
    - "Dual output: canonical JSON + human-readable Markdown from same data"

key-files:
  created:
    - paperforge/worker/discussion.py (393 lines) — record_session() + CLI
    - tests/test_discussion.py (261 lines) — 7 unit tests
  modified:
    - paperforge/skills/literature-qa/scripts/pf-paper.md — added step 8 recording instructions

key-decisions:
  - "D-05 enforced: only /pf-paper records discussions, /pf-deep explicitly excluded"
  - "Atomic writes via tempfile.mkstemp + os.replace() for both JSON and MD"
  - "Paper metadata lookup via rglob in library-records directory"
  - "CLI uses print(json.dumps()) with ensure_ascii=False for stdout output"
  - "sys.stdout.reconfigure(encoding='utf-8') for Windows cp936 compatibility"

patterns-established:
  - "Paper discussion workspace: Literature/{domain}/{key} - {slug}/ai/"
  - "JSON envelope: schema_version, paper_key, sessions[] (append-only array)"
  - "MD format: # AI Discussion Record header, ## date-agent-model session heading, 问题:/解答: pairs"
  - "Never crash — always return status dict with 'ok' or 'error'"

requirements-completed:
  - AI-01
  - AI-02
  - AI-03

duration: 8min
completed: 2026-05-06
---

# Phase 35: AI Discussion Recorder Summary

**Atomic append-only discussion recording module (discussion.py) with stdlib-only record_session() and CLI, plus pf-paper.md prompt integration with pf-deep exclusion per D-05**

## Performance

- **Duration:** 8 min
- **Started:** 2026-05-06T15:20:19Z
- **Completed:** 2026-05-06T15:29:17Z
- **Tasks:** 2 (1 TDD with 2 sub-commits, 1 standard)
- **Files modified:** 3

## Accomplishments

- `paperforge/worker/discussion.py`: record_session() creates `ai/discussion.json` (canonical envelope with `schema_version: "1"`, `paper_key`, `sessions[]`) and `ai/discussion.md` (human-readable with `##` session headings and `**问题:**`/`**解答:**` pairs) — both written atomically via `tempfile.mkstemp` + `os.replace()` with `ensure_ascii=False` for CJK support
- Append-only semantics: second call appends session to `sessions[]` array and adds another `##` heading in Markdown — no data loss on re-run
- CLI subcommand `python -m paperforge.worker.discussion record <key> --vault <path> --agent <name> --model <model> --qa-pairs '<json>'` with `PYTHONIOENCODING=utf-8` and `sys.stdout.reconfigure(encoding='utf-8')` for Windows cp936 compatibility
- Paper metadata lookup via `rglob` in `library-records` directory tree, handling both flat and nested directory structures
- 7 unit tests cover: dual file creation, append, missing vault, unknown key, CJK encoding round-trip, atomic write integrity, CLI invocation
- `paperforge/skills/literature-qa/scripts/pf-paper.md` updated with step 8 (保存讨论记录) — Q&A accumulation, CLI invocation instructions, and explicit pf-deep exclusion per D-05
- Module verified stdlib-only: imports only `json`, `pathlib`, `datetime`, `tempfile`, `os`, `uuid`, `argparse`, `sys`, `re`, `logging`, `__future__`, and `paperforge` internals

## Task Commits

Each task was committed atomically:

1. **Task 1 (TDD): Discussion recorder module**
   - `c2c0e53` (test): add failing tests for discussion recorder
   - `0718098` (feat): implement record_session() with atomic append-only writes
2. **Task 2: pf-paper.md prompt update**
   - `477ab86` (feat): update pf-paper.md with discussion recording step
3. **Cleanup**
   - `c418315` (chore): remove temp verification script

## Files Created/Modified

- `paperforge/worker/discussion.py` - record_session() function (393 lines) + CLI subcommand
- `tests/test_discussion.py` - 7 unit tests (261 lines) covering all behaviors
- `paperforge/skills/literature-qa/scripts/pf-paper.md` - Updated with step 8 recording instructions, prerequisite, and output mention

## Decisions Made

- **D-05 enforced in prompt**: Only `/pf-paper` records discussions; `/pf-deep` explicitly excluded with note that deep-read content lives in formal notes
- **Atomic write pattern**: Used `tempfile.mkstemp()` (fd-based) instead of `tempfile.NamedTemporaryFile()` to avoid Windows file-locking issues — `os.write()` then `os.replace()` for atomic commit
- **Paper lookup**: Uses `rglob("*.md")` with `zotero_key` frontmatter regex matching, handling both flat (`LiteratureControl/*.md`) and nested (`LiteratureControl/library-records/*/*.md`) structures
- **Windows encoding**: Added `sys.stdout.reconfigure(encoding="utf-8")` in CLI `main()` to handle cp936 console encoding on Chinese Windows
- **Paper title slugging**: Delegates to existing `slugify_filename()` from `paperforge.worker._utils` for `ai/` directory name construction

## Deviations from Plan

None - plan executed exactly as written. All acceptance criteria met for both tasks.

## Issues Encountered

- **CLI test encoding on Windows**: `subprocess.run(..., text=True, encoding="utf-8")` failed on Python 3.14/Windows with cp936 console encoding. Fixed by using binary mode (`capture_output=True`, no `text=True`) with manual `.decode("utf-8", errors="replace")` and `PYTHONIOENCODING=utf-8` env var.
- **Paper metadata resolution**: Initial implementation used flat `domain_dir / "{key}.md"` pattern which didn't match the nested `library-records/` subdirectory structure. Fixed by switching to `rglob("*.md")` with `zotero_key` frontmatter regex matching.
- **Windows console encoding**: Terminal display shows Chinese characters as mojibake but file content on disk is correct UTF-8. No code impact — cosmetic terminal issue.

## Next Phase Readiness

- Phase 35 (AI Discussion Recorder) complete — ready for **Phase 36: Integration Verification**
- Discussion files write correctly to `ai/discussion.json` and `ai/discussion.md` with atomic append-only pattern
- pf-paper.md prompt instructs agents to record discussions at session end
- Dashboard team can now consume `discussion.json` from `ai/` directory for AI Q&A history rendering

## Self-Check: PASSED

- [x] paperforge/worker/discussion.py exists (401 lines)
- [x] tests/test_discussion.py exists (261 lines)
- [x] pf-paper.md updated with recording step
- [x] SUMMARY.md created
- [x] Commit c2c0e53 (test) exists
- [x] Commit 0718098 (feat) exists
- [x] Commit 477ab86 (feat) exists
- [x] Module importable: from paperforge.worker.discussion import record_session

---

*Phase: 35-ai-discussion-recorder*
*Completed: 2026-05-06*
