Review Implementation (post-implementation)

Review a completed task's diff through three lenses, each a read-only critic subagent. The counterpart to ../critique-plan/SKILL.md: that guards the plan before coding; this guards the result after.

Silence is the default output. A clean diff produces no findings — that is the normal case. A finding survives only if a senior engineer, looking at this diff, would actually make the change. State each as a concrete cost, not a preference. Never invent refactors to look thorough.

ALWAYS check .ab-method/structure/index.yaml FIRST for paths (task location, domain model, review.md). Review only what this task changed — the cohesive diff across its missions (git diff for the commit range). This is not a whole-codebase audit; that's /improve-codebase-architecture.

Process

1. Gather diff + context

The changed files and their git diff, plus (read only what exists): UBIQUITOUS_LANGUAGE.md / CONTEXT.md (canonical terms, spotting reinvented concepts), docs/architecture/* (the documented way things are built here), docs/adr/ (don't propose what an ADR settled), and the task's unresolved-questions.md if it has one.

Black boxes are deliberate — seed every critic with the file. A TODO(UQ-n) seam whose entry is recorded there is a decision the user signed off on: ship a placeholder rather than guess. No lens may flag it as slop, a shallow module, a speculative abstraction, or dead code, and none may propose "just implement it properly" — the answer isn't theirs to pick. Two things are fair game and should be reported: a TODO(UQ-n) marker with no matching entry (an orphan black box nobody recorded), and a placeholder that leaked past its named seam into several call sites — the seam was supposed to contain it, and containing it again is a safe fix.

2. Spin up THREE read-only critics — in parallel

Spawn three subagents in one batch, named exactly:

Agent	Lens	Brief
cleaner-architecture	depth / deepening	ARCHITECTURE.md
slop-defender	AI code-slop	SLOP.md
reusability-inspector	duplication / reuse	REUSE.md

Each is read-only — analyses the diff, returns a findings list (often empty), edits nothing. Seed each with the diff + context + its lens file — including the task's unresolved-questions.md when it exists, since every lens would otherwise read its placeholders as defects (each lens file says so too). On Codex (spawn_agent is one level deep) spawn them at the orchestrator's own level — flat; on Claude they may nest. Flat works on both.

3. Collect + classify

Merge the lists. Drop anything that's a preference (not a concrete cost), an ADR already settled, or a design change bigger than this task (note it open, don't act). Classify each survivor:

• safe-fix — confirmed, mechanical, covered by existing tests, no interface/behavior change (delete dead code, inline a pass-through, drop a redundant comment, call an existing util of identical semantics).
• needs-judgment — real but design-level, risky, behavior/interface-affecting, or not test-covered.

4. Act — by mode

Interactive (manual create-task tail, or standalone): present findings grouped by lens, each marked safe-fix/needs-judgment; apply what the user approves; run tests; report.

Autonomous (start-task / start-roadmap — afk): the orchestrator (never the parallel critics) applies fixes, so there are no concurrent writes:

1. For each safe-fix: apply it, re-run the test suite (command from tech-stack.md). Green → keep. Red → revert it, downgrade to needs-judgment with a note (attempted, reverted — broke <test>).
2. Commit kept fixes as one refactor(<task>): post-review cleanup (repo convention). Nothing kept → no commit.
3. Write docs/tasks/<task>/review.md (below) — every finding, applied or open. Never prompt; anything uncertain stays open rather than being changed.

5. review.md format

Written next to progress-tracker.md. Always write it in autonomous mode — even when clean — so the afk user knows the review ran.

# Post-Implementation Review: <Task Name>
**Reviewed**: YYYY-MM-DD   **Scope**: missions <a–z> / commit <range>

## Applied — safe fixes ✅ (commit <hash>)
- [slop-defender] removed pass-through wrapper `fooProxy` — src/foo.ts
- [cleaner-architecture] inlined shallow `formatName` into its one caller — src/user.ts

## Open — need your judgment ⬜
### [reusability-inspector] duplicates `paymentService.calculateTax`
- **Files**: src/checkout/tax.ts
- **Why it matters**: two tax formulas will drift; a rate change must be made twice.
- **Suggested change**: call the existing `paymentService.calculateTax` instead.

## Clean lenses
- slop-defender: no further findings

If all three lenses are clean and nothing was applied, the whole body is one line: All three lenses clean — no findings.