# Work Log: codex/issue-156-spec-drift-linter

## Header

- Branch: `codex/issue-156-spec-drift-linter`
- Classification: feature
- Classified by: Codex
- Frozen: true
- Created Date: 2026-06-04
- Owner: Codex contributor session
- Guardrails Mode: Full
- Current Phase: ship
- Checkpoint SHA: c76812d6b1a71ee7e857543789ca88ab7934d2d0
- Recommended Skills: karpathy-principles (auto), test-driven-development (auto), red-team-adversarial (auto), verification-before-completion (auto)
- Primary Domain Snapshot: governance-tooling
- SSoT Sequence: 31

---

## Session Info

- Agent: Codex
- Session: 2026-06-04T10:34:59+08:00
- Platform: Codex App
- Guardrails loaded: AGENTS.md + engineering_guardrails.md §1, §2, §4, §7, §8.1, §10 (core) + security_guardrails.md
- Override: none
- Files Read: current_state.md, routing.md, bootstrap.md, spec.md, plan.md, implement.md, shared-contracts.md, review.md, skill_conflict_matrix.md, selected skill bodies, backlog row, relevant tests/tools

---

## Task Description

Implement GitHub issue #156: add an advisory spec drift linter that compares branch-changed files against path references in a feature spec's Acceptance Criteria, then wire it into `/review` as a non-blocking signal.

Full phase chain: /bootstrap -> /spec -> /plan -> /implement -> /review -> /test -> /handoff -> /ship.

---

## Phase Sequence

- bootstrap
- plan
- implement
- review
- test
- handoff
- ship

---

## Phase Summary

- bootstrap: classified as feature because the change adds a new tool, test coverage, workflow behavior, and a governing spec; matched TDD/Karpathy/red-team/verification skills.
- spec: created frozen spec `docs/specs/spec-drift-linter.md` for #156 under direct user execution approval.
- plan: target files are `.agentcortex/tools/lint_spec_drift.py`, `tests/guard/test_spec_drift_linter.py`, and `.agent/workflows/review.md`; TDD-first implementation; mode Normal. | Confidence: 93% - high
- implement: added advisory spec drift linter, focused tests, `/review` hook, and revision-option validation; focused and full guard/CI tests pass.
- review: PASS; AC-1..AC-5 proven by code/test/workflow line refs; security clean; red-team findings none.
- test: PASS; focused unittest, full `tests/ci tests/guard`, validate.ps1, and Git Bash validate.sh all pass.
- handoff: delivered resumable state for #156; implementation commit `c76812d`; next action is `/ship`.
- ship: shipped #156; spec/backlog/SSoT/domain log updated; Work Log archived to `.agentcortex/context/archive/codex-issue-156-spec-drift-linter-20260604.md`.
- ⚡ ACX

---

## Gate Evidence

- Gate: bootstrap | Verdict: PASS | Classification: feature | Timestamp: 2026-06-04T10:34:59+08:00
- Gate: plan | Verdict: PASS | Classification: feature | Timestamp: 2026-06-04T10:35:30+08:00
- Gate: implement | Verdict: PASS | Classification: feature | Timestamp: 2026-06-04T10:58:00+08:00
- Gate: review | Verdict: PASS | Classification: feature | Timestamp: 2026-06-04T11:08:00+08:00
- Gate: test | Verdict: PASS | Classification: feature | Timestamp: 2026-06-04T11:08:30+08:00
- Gate: handoff | Verdict: PASS | Classification: feature | Timestamp: 2026-06-04T11:18:00+08:00
- Gate: ship | Verdict: PASS | Classification: feature | Timestamp: 2026-06-04T11:30:00+08:00

---

## External References

| Type | Path / URL | Notes |
|---|---|---|
| Issue | https://github.com/KbWen/agentic-os/issues/156 | Source request and scope |
| Spec | docs/specs/spec-drift-linter.md | Frozen task spec |

---

## Known Risk

- Advisory output could become noisy if AC prose mentions broad directories; mitigation: deterministic path extraction, explicit limits, and tests for partial/missing coverage.
- Review workflow could accidentally make advisory lint feel mandatory; mitigation: wording says it never blocks and exits 0.
- Rollback plan: revert this branch/commit; no migrations or persistent data changes.

## Plan

- Target Files: `.agentcortex/tools/lint_spec_drift.py`, `tests/guard/test_spec_drift_linter.py`, `.agent/workflows/review.md`
- Step 1: Add failing linter tests for spec/worklog detection and advisory output; verify with `python -m unittest tests.guard.test_spec_drift_linter -v`.
- Step 2: Implement the stdlib-only linter CLI; verify focused unittest passes.
- Step 3: Add `/review` advisory invocation text; verify command and non-blocking wording exist.
- Step 4: Run focused tests plus repository validation; verify zero failures.
- AC Coverage: AC-1 -> Step 2; AC-2 -> Step 2; AC-3 -> Step 2; AC-4 -> Step 1; AC-5 -> Step 3.
- Risk/Rollback: false-positive advisory noise; revert branch commit if the linter proves too noisy.

---

## Conflict Resolution

- karpathy-principles + verification-before-completion: compatible; Karpathy scopes implementation, verification enforces evidence.

---

## Skill Notes

### karpathy-principles
- Checklist: keep the linter small, avoid speculative configuration, and ensure every changed line traces to #156.
- Checklist: during review, verify no drive-by refactor or unrelated workflow edits were introduced.
- Constraint: do not add abstractions unless there is an immediate second consumer.

### test-driven-development
- Checklist: write tests for path extraction, worklog/spec detection, advisory mismatch output, and exit-code behavior before implementation.
- Checklist: use Red -> Green cycles for each behavior slice.
- Constraint: no production linter logic before a failing test exists for that behavior.

### verification-before-completion
- Checklist: compare actual changed files against planned target files before claiming completion.
- Checklist: run focused tests plus repository validation before ship.
- Constraint: no evidence means no completion claim.

---

## Drift Log

- Skip Attempt: NO
- Gate Fail Reason: N/A
- Token Leak: NO
- ADR coverage skipped: `check_adr_coverage.py` returned `no_covering_adr`; no new architectural boundary is introduced, and the change is scoped to an advisory review-time tool.
- Backlog reclassification: row #50 listed Tier `quick-win`, but implementation requires feature flow because it adds a spec, tool, test, and workflow hook.
- SSoT Spec Index updated during spec/implement because validation requires non-draft specs to be indexed before review.
- Primary domain corrected at ship: bootstrap snapshot said `governance-tooling`, but existing domain taxonomy maps this change to `document-governance`; L2 consolidation was written to `docs/architecture/document-governance.log.md`.

---

## Design Reference

none

---

## Observability

Sink: CLI stderr/stdout | Scope: `.agentcortex/tools/lint_spec_drift.py` invalid invocation diagnostics | Verified: yes

---

## Review Findings

- Burden of Proof: AC-1 proven by `.agentcortex/tools/lint_spec_drift.py:92` and `.agentcortex/tools/lint_spec_drift.py:133`; AC-2 by `.agentcortex/tools/lint_spec_drift.py:53`, `.agentcortex/tools/lint_spec_drift.py:69`, and `.agentcortex/tools/lint_spec_drift.py:106`; AC-3 by `.agentcortex/tools/lint_spec_drift.py:145` and `.agentcortex/tools/lint_spec_drift.py:168`; AC-4 by `tests/guard/test_spec_drift_linter.py:139` and focused test output; AC-5 by `.agent/workflows/review.md:16` and `tests/guard/test_spec_drift_linter.py:163`.
- Security: clean. No auth, crypto, dependency, or shell execution expansion; git revisions reject option-like values via `.agentcortex/tools/lint_spec_drift.py:86`.
- Red Team Findings: none. Full feature review found no concrete exploit path; subprocess calls use fixed argv lists and reject option-like revisions.

---

## Resume

- State: HANDEDOFF
- Completed: bootstrap, spec, plan, implement, review, test, handoff for GitHub issue #156.
- Next: Run `/ship`; update shipped spec/backlog/SSoT/archive state and commit ship metadata.
- Context: #156 shipped an advisory, stdlib-only spec drift linter. It intentionally warns without blocking review verdicts; Burden of Proof remains the hard review evidence path.

### Read Map (for next agent)
Files the next agent MUST read:
- `.agentcortex/context/work/codex-issue-156-spec-drift-linter.md` -> Resume, Gate Evidence, Evidence
- `docs/specs/spec-drift-linter.md` -> full
- `.agentcortex/tools/lint_spec_drift.py` -> full
- `.agent/workflows/review.md` -> Spec Drift Advisory

### Skip List
Files the next agent can SKIP (already processed, no changes expected):
- `tests/guard/test_spec_drift_linter.py` - reviewed and passing; read only if changing linter behavior
- `.agent/rules/engineering_guardrails.md` - already loaded for this session; no edits in scope
- `.agent/rules/security_guardrails.md` - security scan completed; no findings

### Context Snapshot (≤ 200 tokens)
The branch implements #156 with a small CLI linter that extracts path-like references from a spec Acceptance Criteria section, compares them to git changed files (including untracked files for local review), and prints advisory warnings while returning 0. `/review` now tells reviewers to run it as non-blocking context. Tests cover clean, uncovered, untouched, worklog detection, advisory exit behavior, and unsafe git revision values.

### Backlog Status (if applicable)
- Active Backlog: `docs/specs/_product-backlog.md`
- Current Feature: #50 Spec drift linter - In Progress
- Shipped Feature: #50 Spec drift linter - Shipped 2026-06-04
- Remaining: 23 pending, 0 deferred
- Next Recommended: user choice

---

## Test Gate Results

- `python -m unittest tests.guard.test_spec_drift_linter -v` -> OK (8 tests)
- `python -m pytest tests/ci tests/guard -q` -> 188 passed
- `powershell -ExecutionPolicy Bypass -File .agentcortex/bin/validate.ps1` -> Summary: pass=102 warn=6 fail=0 skip=2
- `C:\Program Files\Git\bin\bash.exe .agentcortex/bin/validate.sh` -> Summary: pass=102 warn=6 fail=0 skip=2

---

## Evidence

- Command: python -m unittest tests.guard.test_spec_drift_linter -v
  Result: FAIL
  Summary: ModuleNotFoundError: No module named 'tests.guard.test_spec_drift_linter' (expected Red step before adding tests)
- Command: python -m unittest tests.guard.test_spec_drift_linter -v
  Result: PASS
  Summary: Ran 8 tests in 0.010s; OK
- Command: python -m pytest tests/ci tests/guard -q
  Result: PASS
  Summary: 188 passed in 296.57s
- Command: powershell -ExecutionPolicy Bypass -File .agentcortex/bin/validate.ps1
  Result: PASS
  Summary: pass=102 warn=6 fail=0 skip=2
- Command: C:\Program Files\Git\bin\bash.exe .agentcortex/bin/validate.sh
  Result: PASS
  Summary: pass=102 warn=6 fail=0 skip=2
