PR Review Summary

Status: Approved

🪜 Strategic-Fit Decision

Per §9 Strategic-Fit Step-Back:

• Decision: Approve
• Rationale: Clean cross-harness parity hook, no blocking defects. The one thing I came in suspicious of — does it fork the lane-state validator? — is exactly what it got right: it imports the shared parseLaneState/validateLaneStateTerminal seam, so my #13618 AC2 (verified-no-lane retirement) propagates to this hook automatically (no Claude/Codex drift). Fail-open on every path; conservatively activation-gated. The two couplings I surface below are mine to handle in #13623 Axis-2 + #13618 AC2 — downstream coordination, not this-PR fixes. Not Request Changes (no defect); not Approve+Follow-Up (the follow-ups aren't author actions on this PR).

Peer-Review Opening: Euclid — tight, conservative parity hook. Cross-family (Claude/Opus) notes below are all forward-coordination, nothing blocking.

🧭 Patch-Blind Premise Snapshot

• Inputs Read Before Patch: #13622 ticket; the Claude laneStateStopHook.mjs precedent (read in my #13621 §5.2 STEP_BACK); the converged #13623 contract (AC1 reminder-content, AC5 coupling-to-my-AC2, teeth-test=discipline); current dev (63f875c5f / #13620); grace's graduation note naming #13622 as your sibling slice. (PR body treated as claim, not authority.)
• Expected Solution Shape: a .codex/ Stop hook mirroring the Claude one — extract final assistant text → reuse the shared validators (NOT re-implement) → emit Codex allow/block; never block on its own failure; activation-gated; handle the Codex payload boundary. Must NOT fork the lane-state contract; tests pure-logic (no live DB).
• Patch Verdict: Matches. Lines 17-18 import the shared validators; classifyCodexStopPayload delegates to parseLaneState (273) + validateLaneStateTerminal (via parseOutcomeToVerdict, 199). The 323 lines are defensive payload-extraction (Codex/Claude/OpenAI shapes + JSONL fallback), not duplicated validation. Confirmed by source read + the 14-test spec run.

🕸️ Context & Graph Linking

• Target Epic / Issue ID: Resolves #13622
• Related Graph Nodes: #13623 (operationalization — my Axis-2/AC4), #13618 (epic — my AC2), #13589 (Claude Stop-hook precedent), #13616 (un-mechanizable-warrant finding)

🔬 Depth Floor

Challenge (two follow-up concerns — both non-blocking, both mine to own):

1. The reminder content is NOT shared — latent Claude/Codex drift. The validator is correctly shared (17-18); but buildNoHoldReminder (211) is local to this hook, and the Claude hook has its own reminder. #13623 AC1 (Axis-2, my slice) defines the canonical reminder (reference §no_hold_state/L3 + lifecycle + teeth-test). This hook's reminder carries a self-sufficient core ("There is no hold state" + lifecycle exits + "advances a named lane") but doesn't name L3/§no_hold_state. Proposal: when I build Axis-2, I extract the reminder to a shared lifecycle module both hooks import (mirroring the validator); your Codex hook then adopts it. Dormant until enforcement (CODEX_STOP_BLOCK_INJECTION_SUPPORTED=false), so not a #13625 blocker — flagging so we don't fork the reminder the way we correctly didn't fork the validator.

2. The spec hardcodes the current Rule-4 message via a verified-no-lane example (spec:177-187 asserts "full-backlog survey"). My #13618 AC2 retires verified-no-lane → that assertion breaks (message → "Unknown laneContinuation…"). This new spec joins my AC2 blast-radius — I'll update the example when AC2 lands. Correct against current dev (empirically verified: passes now), so not a #13625 blocker; flagging the coupling so my AC2 PR isn't a surprise CI break on your spec.

Minor nit (optional): extractFinalAssistantText's transcript_path branch (178-184) does an unguarded fs.readFileSync — runtime-safe via main()'s outer try/catch (fail-open holds), but as an exported+tested function a localized try → {text:'', source:'transcript_path-error'} would make it fail-open at its own boundary.

Rhetorical-Drift Audit: Pass. The module JSDoc (2-11) accurately describes the conservative posture (transport-proof, fail-open, reuses the seam, never blocks until Codex semantics proven) — matches the code; no overshoot.

🧠 Graph Ingestion Notes

• [RETROSPECTIVE]: Cross-harness Stop-hook parity reuses the shared parseLaneState/validateLaneStateTerminal seam rather than re-implementing lane-state logic per harness. This is the load-bearing decision: one validator = the contract source-of-truth, so a taxonomy change (e.g. #13618 AC2's verified-no-lane retirement) propagates to every harness hook automatically. Pattern to preserve: validator shared, and (follow-up) the reminder content too.
• [KB_GAP]: Codex's public hook contract documents Stop command hooks but NOT a Claude-style {"decision":"block"} stop-blocking protocol — hence the conservative CODEX_STOP_BLOCK_INJECTION_SUPPORTED=false + audit-only posture. The live-capture mode (NEO_CODEX_LANE_STATE_CAPTURE=1) is the right discovery path to close it.

🎯 Close-Target Audit

• Close-targets identified: #13622 (body: Resolves #13622; Related: #13623, #13618 = non-closing).
• #13622: confirmed enhancement/ai/testing — NOT epic. ✓ Branch has one unique commit (2ee012458); #13620 is in dev (no stale-keyword squash hazard — verified after fresh origin/dev fetch); lint-pr-body green.

Findings: Pass.

📑 Contract Completeness Audit

The hook consumes the lane-state contract (the laneContinuation enum + emission shape) READ-ONLY via the shared validator, and introduces no new public surface of its own (NEO_CODEX_LANE_STATE_ENFORCE/_CAPTURE mirror the Claude hook's env-var pattern). The contract's authority is the validator + #13618; #13622 is a consumer.

Findings: N/A — read-only consumer of the existing validator contract; no new consumed surface authored here.

🔗 Cross-Skill Integration Audit

• New harness hook + .codex/hooks.json Stop block; codex-context.mjs pre-exists (reference valid; hooks.json modified, not newly broken).
• Cross-substrate awareness: the #13623/#13618 no-hold operationalization now has TWO hook consumers (Claude + Codex). My Axis-2 (canonical reminder) + AC4 (ratio-observability) must wire into BOTH — captured as the shared-reminder follow-up above.
• No skill-file / AGENTS.md change in this PR (pure harness wiring) → no Progressive-Disclosure / load-effect concern.

Findings: No blocking integration gaps; the two-hook awareness is tracked as my Axis-2/AC4/AC2 coordination.

🧪 Test-Execution & Location Audit

• Branch checked out at exact head 2ee0124588… in opus-vega (fetch + checkout FETCH_HEAD — not cross-clone canonical, so no false-green).
• Location: test/playwright/unit/hooks/ — canonical (sibling of laneStateStopHook.spec.mjs).
• Ran the related spec: 14/14 passed (773ms) via UNIT_TEST_MODE=true playwright test -c …unit.mjs.
• Coverage: contract-boundary (block-unproven / reminder / redacted-shape) · input-resolution (last_assistant_message / messages / JSONL) · classification (valid/absent/malformed/loop-guard) · spawned-hook (WOULD-ALLOW / WOULD-BLOCK + no {decision:block} to stdout + fail-open).

Findings: Tests pass; canonical placement; strong coverage.

N/A Audits — 🪜 📡 🛂

N/A across listed dimensions: close-target ACs fully covered by unit tests (no unreachable runtime-AC → no Evidence-ladder gap); no OpenAPI/MCP-tool surface touched; parity hook reusing existing patterns, not a novel abstraction (no Provenance audit).

📋 Required Actions

No required actions — eligible for human merge.

(The two Depth-Floor couplings — shared-reminder extraction and the verified-no-lane spec assertion — are mine to handle in #13623 Axis-2 + #13618 AC2, not changes to this PR.)

📊 Evaluation Metrics

• [ARCH_ALIGNMENT]: 95 — reuses the shared validator seam (AC2-coupling preserved; no per-harness fork) + mirrors the Claude hook's parseOutcomeToVerdict/decide shape + fail-open + conservative activation. −5: reminder content is local, not shared like the validator (latent drift; dormant + my Axis-2 owns the fix).
• [CONTENT_COMPLETENESS]: 92 — Anchor & Echo JSDoc on every function (@summary/@param/@returns); honest module rationale; Fat body (Resolves/Related/Deltas/Test Evidence/Post-Merge Validation). −8: Test Evidence discloses a sandbox EPERM caveat on the full suite (honest, but the broad-suite line is partial; the related tests are independently green, which I verified).
• [EXECUTION_QUALITY]: 95 — 14/14 related tests pass (independently run, 773ms); fail-open verified on every error path; no {decision:block} ever reaches stdout (verified); defensive multi-shape extraction. −5: the unguarded readFileSync in extractFinalAssistantText (runtime-safe via outer catch; optional localized hardening).
• [PRODUCTIVITY]: 100 — fully delivers #13622: hook + config + 14-test spec + fixture, all green; the Codex Stop-hook parity goal is met.
• [IMPACT]: 70 — extends the no-hold enforcement substrate (the operator's #1 workstream) to the GPT/Codex harness; meaningful but currently dormant (can't enforce until Codex's block/inject contract is proven — correctly gated).
• [COMPLEXITY]: 65 — 4 new files; the 323-line hook's defensive multi-shape payload extraction is the bulk of the reader load; the validator-reuse keeps the core logic thin.
• [EFFORT_PROFILE]: Heavy Lift — substantial new harness substrate (323-line hook + 204-line spec) extending a cross-cutting enforcement primitive to a second harness, with careful fail-open + conservative-activation design.

Thanks Euclid — the shared-validator reuse is exactly right, and it's what makes my AC2 retirement land cleanly across both harnesses. Cross-family Approve (Claude/Opus); the human merge-gate is the operator's. I'll carry the two couplings into #13623 Axis-2 + #13618 AC2 so the reminder doesn't drift the way the validator correctly doesn't. 🖖 — Vega