**Owner:** Proveo (Angie Jones) **Date:** 2026-05-18 **MC:** #101336 **Input:** phase3-p1-sweep-log.md (CodeCraft MC #101335) **Top Verdict:** PASS
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## Top-Level Verdict: PASS
All 6 P1 harness fixes verified SAFE. All 3 deprecation warn hooks fire on legacy paths with backward compat preserved. Both append paths SAFE under 4-concurrent-writer load. MEMORY.md daemon serialises correctly (tmp clone test). All 3 DEFERRED items confirmed honestly tagged with grep-verified rationale.
**Result from probe.jsonl** (`/tmp/session-collision-20260518T201737/probe.jsonl`): - `lightrag_health: LAST_WRITER_WINS`
Confirms: old TOCTOU path (no lockf) still produces LAST_WRITER_WINS at w=4. The lockf fix is the actual delta. No regression introduced — the legacy path is intentionally left unfixed (it's the BEFORE state).
**Track 2 Verdict: PASS (contrast confirmed, no regression of fixed path)**
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## Track 3 — Deprecation Warn Hooks
### Track 3a — pre-dispatch-gate.sh (P1-4)
**Command:** `echo '{"tool_name":"Task","tool_input":{"prompt":"... MC #99999"}}' | bash pre-dispatch-gate.sh` **Fixture:** Legacy `/tmp/mehanik-cleared-99999` placed, no session-scoped path, `CLAUDE_SESSION_ID` unset **Observed stderr:** `[pre-dispatch-gate] DEPRECATION WARN: mehanik-cleared-99999 found at legacy flat path /tmp/mehanik-cleared-99999. Two concurrent sessions on same MC both accept this — potential double-dispatch. Migrate to session-scoped path.` **Exit code:** 0 (hook continued, subsequent gate fired for unrelated probe reason — backward compat preserved) **DEPRECATION_WARN_COUNT:** 1
**Track 3a Verdict: PASS**
### Track 3b — schema-stub-gate.sh (P1-6)
**Command:** `echo '{"tool_name":"Bash","tool_input":{"command":"node mc.js ready 88888"}}' | bash schema-stub-gate.sh` **Fixture:** Legacy `/tmp/claim-schema-88888.json` placed, no session-scoped path **Observed stderr:** `[schema-stub-gate] DEPRECATION WARN: claim-schema-88888.json found at legacy flat path /tmp/claim-schema-88888.json. Two sessions on same MC ID share this file. Migrate to session-scoped path.` **Exit code:** 0 (backward compat preserved) **DEPRECATION_WARN_COUNT:** 1
**Track 3b Verdict: PASS**
### Track 3c — session-output-validator.sh (P1-5)
**Command:** Synthetic JSONL transcript with legacy `/tmp/evidence-77777/` path in John's message, fed to hook via `{"session_id":...,"transcript_path":...}` stdin **Fixture:** Legacy `/tmp/evidence-77777/verification.json` with mtime past grandfather epoch (2026-05-18T01:00 > cutoff 2026-05-11T17:15) **Observed stderr:** `[session-output-validator] DEPRECATION WARN: legacy evidence dir /tmp/evidence-77777/ used. Two sessions may create same numeric dir. Migrate to /tmp/alai//evidence-/.` **Exit code:** 0 (validation SCORE=100, VIOLATIONS=0, ACTION=none — backward compat preserved) **DEPRECATION_WARN_COUNT:** 1
**Track 3c Verdict: PASS**
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## Track 4 — Append-Path Safety (P1-2, P1-3)
**Pattern verification (grep on mc.js):** - `evidence-ledger.jsonl`: `fs.openSync(ledgerPath, 'a')` + `fs.writeSync` + `fs.fsyncSync` + `fs.closeSync` (mc.js:329-334) — O_APPEND with fsync, single-write per entry - `evidence-index.jsonl`: `fs.appendFileSync(indexPath, ...)` (mc.js:226) — O_APPEND, single JSON line per call
**Daemon status check:** ``` node memory-writer.js status → daemon: RUNNING | socket: /tmp/alai/memory-writer.sock | pid: 82720 ```
**Serialisation test:** Inline test daemon started with socket at `/tmp/t10-quad-track5-81233/test-memory-writer.sock`, writing to `/tmp/t10-quad-track5-81233/MEMORY-clone.md` (production MEMORY.md NOT touched).
**4 concurrent `Promise.all` append calls result:** - All 4 responses: `{"ok":true,"op":"append","bytes":58}` - Pre line count: 2, Post line count: 6 (expected 6) - Writer hits per line: [1, 1, 1, 1] — each writer's line appears exactly once, no interleave - `ALL_WRITERS_EXACTLY_ONE: true`
**Note:** Test used a tmp-clone daemon with identical serialisation queue logic from production memory-writer.js. Production MEMORY.md was not modified.
**Track 5 Verdict: SAFE (VERIFIED-PARTIAL note: tested via tmp clone daemon, not live production socket — production daemon confirmed RUNNING at pid 82720)**
**Grep:** `grep -n "hop-build-started" ~/system/kernel/pi-orchestrator.js` **Result:** Line 4028: `fs.writeFileSync('/tmp/hop-build-started-${task.id}', ...)` **Observation:** Path is `/tmp/hop-build-started-${task.id}` — per-task-id, not per-session. The marker is task-scoped, so the collision vector is two sessions dispatching the same task simultaneously. A lockf on the file path cannot prevent this — the race is at task-dispatch decision level. Fix requires CAS at task-start in mc.js, not a file-path fix. **Deferral reason: HONEST**
**Grep:** `grep -n "playwright" ~/.claude/settings.json` **Result:** Line 21: `"mcp__playwright__*"` in allow list; Line 327: matcher for MCP tool. No hook file wraps MCP dispatch before the Playwright server — confirmed by `grep -rn "playwright" ~/.claude/hooks/` returning only `settings.json:21`. **Observation:** Playwright is an out-of-process singleton spawned by Claude Code runtime. There is no hook intercept point before MCP tool calls. Session isolation requires MCP-side browser context implementation. **Deferral reason: HONEST**
**Grep:** `sed -n '72,84p' ~/.claude/hooks/session-task-lock-gate.sh` **Result:** Lines 75-81 contain explicit comment: `# /tmp/mc-active-task is single-writer, world-writable, shared across all sessions and daemons → cross-session contamination. Global lock as shared mutable state in concurrent system = design flaw, not partial problem. Per-PPID and per-PID markers are now the ONLY authoritative blocking source.` **Observation:** The design flaw is explicitly acknowledged in code. T3 probed SAFE at both w=2 and w=4. The world-writable global file is read for audit/debug only (line 82+), not for enforcement. Deferred to technical debt backlog. **Deferral reason: HONEST**
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