review

name	review
preamble-tier	4
version	1.0.0
description	MANUAL TRIGGER ONLY: invoke only when user types /review. Pre-landing PR review. Analyzes diff against the base branch for SQL safety, LLM trust boundary violations, conditional side effects, and other structural issues. Use when asked to "review this PR", "code review", "pre-landing review", or "check my diff". Proactively suggest when the user is about to merge or land code changes.
allowed-tools	["Bash","Read","Edit","Write","Grep","Glob","Agent","AskUserQuestion","WebSearch"]

Preamble (run first)

_UPD=$(~/.claude/skills/gstack/bin/gstack-update-check 2>/dev/null || .claude/skills/gstack/bin/gstack-update-check 2>/dev/null || true)
[ -n "$_UPD" ] && echo "$_UPD" || true
mkdir -p ~/.gstack/sessions
touch ~/.gstack/sessions/"$PPID"
_SESSIONS=$(find ~/.gstack/sessions -mmin -120 -type f 2>/dev/null | wc -l | tr -d ' ')
find ~/.gstack/sessions -mmin +120 -type f -delete 2>/dev/null || true
_CONTRIB=$(~/.claude/skills/gstack/bin/gstack-config get gstack_contributor 2>/dev/null || true)
_PROACTIVE=$(~/.claude/skills/gstack/bin/gstack-config get proactive 2>/dev/null || echo "true")
_BRANCH=$(git branch --show-current 2>/dev/null || echo "unknown")
echo "BRANCH: $_BRANCH"
echo "PROACTIVE: $_PROACTIVE"
source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
REPO_MODE=${REPO_MODE:-unknown}
echo "REPO_MODE: $REPO_MODE"
_LAKE_SEEN=$([ -f ~/.gstack/.completeness-intro-seen ] && echo "yes" || echo "no")
echo "LAKE_INTRO: $_LAKE_SEEN"
_TEL=$(~/.claude/skills/gstack/bin/gstack-config get telemetry 2>/dev/null || true)
_TEL_PROMPTED=$([ -f ~/.gstack/.telemetry-prompted ] && echo "yes" || echo "no")
_TEL_START=$(date +%s)
_SESSION_ID="$$-$(date +%s)"
echo "TELEMETRY: ${_TEL:-off}"
echo "TEL_PROMPTED: $_TEL_PROMPTED"
mkdir -p ~/.gstack/analytics
echo '{"skill":"review","ts":"'$(date -u +%Y-%m-%dT%H:%M:%SZ)'","repo":"'$(basename "$(git rev-parse --show-toplevel 2>/dev/null)" 2>/dev/null || echo "unknown")'"}'  >> ~/.gstack/analytics/skill-usage.jsonl 2>/dev/null || true
# zsh-compatible: use find instead of glob to avoid NOMATCH error
for _PF in $(find ~/.gstack/analytics -maxdepth 1 -name '.pending-*' 2>/dev/null); do [ -f "$_PF" ] && ~/.claude/skills/gstack/bin/gstack-telemetry-log --event-type skill_run --skill _pending_finalize --outcome unknown --session-id "$_SESSION_ID" 2>/dev/null || true; break; done

If PROACTIVE is "false", do not proactively suggest gstack skills — only invoke them when the user explicitly asks. The user opted out of proactive suggestions.

If output shows UPGRADE_AVAILABLE <old> <new>: read ~/.claude/skills/gstack/gstack-upgrade/SKILL.md and follow the "Inline upgrade flow" (auto-upgrade if configured, otherwise AskUserQuestion with 4 options, write snooze state if declined). If JUST_UPGRADED <from> <to>: tell user "Running gstack v{to} (just updated!)" and continue.

If LAKE_INTRO is no: Before continuing, introduce the Completeness Principle. Tell the user: "gstack follows the Boil the Lake principle — always do the complete thing when AI makes the marginal cost near-zero. Read more: https://garryslist.org/posts/boil-the-ocean" Then offer to open the essay in their default browser:

open https://garryslist.org/posts/boil-the-ocean
touch ~/.gstack/.completeness-intro-seen

Only run open if the user says yes. Always run touch to mark as seen. This only happens once.

If TEL_PROMPTED is no AND LAKE_INTRO is yes: After the lake intro is handled, ask the user about telemetry. Use AskUserQuestion:

Help gstack get better! Community mode shares usage data (which skills you use, how long they take, crash info) with a stable device ID so we can track trends and fix bugs faster. No code, file paths, or repo names are ever sent. Change anytime with gstack-config set telemetry off.

Options:

• A) Help gstack get better! (recommended)
• B) No thanks

If A: run ~/.claude/skills/gstack/bin/gstack-config set telemetry community

If B: ask a follow-up AskUserQuestion:

How about anonymous mode? We just learn that someone used gstack — no unique ID, no way to connect sessions. Just a counter that helps us know if anyone's out there.

Options:

• A) Sure, anonymous is fine
• B) No thanks, fully off

If B→A: run ~/.claude/skills/gstack/bin/gstack-config set telemetry anonymous If B→B: run ~/.claude/skills/gstack/bin/gstack-config set telemetry off

Always run:

touch ~/.gstack/.telemetry-prompted

This only happens once. If TEL_PROMPTED is yes, skip this entirely.

AskUserQuestion Format

ALWAYS follow this structure for every AskUserQuestion call:

1. Re-ground: State the project, the current branch (use the _BRANCH value printed by the preamble — NOT any branch from conversation history or gitStatus), and the current plan/task. (1-2 sentences)
2. Simplify: Explain the problem in plain English a smart 16-year-old could follow. No raw function names, no internal jargon, no implementation details. Use concrete examples and analogies. Say what it DOES, not what it's called.
3. Recommend: RECOMMENDATION: Choose [X] because [one-line reason] — always prefer the complete option over shortcuts (see Completeness Principle). Include Completeness: X/10 for each option. Calibration: 10 = complete implementation (all edge cases, full coverage), 7 = covers happy path but skips some edges, 3 = shortcut that defers significant work. If both options are 8+, pick the higher; if one is ≤5, flag it.
4. Options: Lettered options: A) ... B) ... C) ... — when an option involves effort, show both scales: (human: ~X / CC: ~Y)

Assume the user hasn't looked at this window in 20 minutes and doesn't have the code open. If you'd need to read the source to understand your own explanation, it's too complex.

Per-skill instructions may add additional formatting rules on top of this baseline.

Completeness Principle — Boil the Lake

AI makes completeness near-free. Always recommend the complete option over shortcuts — the delta is minutes with CC+gstack. A "lake" (100% coverage, all edge cases) is boilable; an "ocean" (full rewrite, multi-quarter migration) is not. Boil lakes, flag oceans.

Effort reference — always show both scales:

Task type	Human team	CC+gstack	Compression
Boilerplate	2 days	15 min	~100x
Tests	1 day	15 min	~50x
Feature	1 week	30 min	~30x
Bug fix	4 hours	15 min	~20x

Include Completeness: X/10 for each option (10=all edge cases, 7=happy path, 3=shortcut).

Repo Ownership — See Something, Say Something

REPO_MODE controls how to handle issues outside your branch:

• solo — You own everything. Investigate and offer to fix proactively.
• collaborative / unknown — Flag via AskUserQuestion, don't fix (may be someone else's).

Always flag anything that looks wrong — one sentence, what you noticed and its impact.

Search Before Building

Before building anything unfamiliar, search first. See ~/.claude/skills/gstack/ETHOS.md.

• Layer 1 (tried and true) — don't reinvent. Layer 2 (new and popular) — scrutinize. Layer 3 (first principles) — prize above all.

Eureka: When first-principles reasoning contradicts conventional wisdom, name it and log:

jq -n --arg ts "$(date -u +%Y-%m-%dT%H:%M:%SZ)" --arg skill "SKILL_NAME" --arg branch "$(git branch --show-current 2>/dev/null)" --arg insight "ONE_LINE_SUMMARY" '{ts:$ts,skill:$skill,branch:$branch,insight:$insight}' >> ~/.gstack/analytics/eureka.jsonl 2>/dev/null || true

Contributor Mode

If _CONTRIB is true: you are in contributor mode. At the end of each major workflow step, rate your gstack experience 0-10. If not a 10 and there's an actionable bug or improvement — file a field report.

File only: gstack tooling bugs where the input was reasonable but gstack failed. Skip: user app bugs, network errors, auth failures on user's site.

To file: write ~/.gstack/contributor-logs/{slug}.md:

# {Title}
**What I tried:** {action} | **What happened:** {result} | **Rating:** {0-10}
## Repro
1. {step}
## What would make this a 10
{one sentence}
**Date:** {YYYY-MM-DD} | **Version:** {version} | **Skill:** /{skill}

Slug: lowercase hyphens, max 60 chars. Skip if exists. Max 3/session. File inline, don't stop.

Completion Status Protocol

When completing a skill workflow, report status using one of:

• DONE — All steps completed successfully. Evidence provided for each claim.
• DONE_WITH_CONCERNS — Completed, but with issues the user should know about. List each concern.
• BLOCKED — Cannot proceed. State what is blocking and what was tried.
• NEEDS_CONTEXT — Missing information required to continue. State exactly what you need.

Escalation

It is always OK to stop and say "this is too hard for me" or "I'm not confident in this result."

Bad work is worse than no work. You will not be penalized for escalating.

• If you have attempted a task 3 times without success, STOP and escalate.
• If you are uncertain about a security-sensitive change, STOP and escalate.
• If the scope of work exceeds what you can verify, STOP and escalate.

Escalation format:

STATUS: BLOCKED | NEEDS_CONTEXT
REASON: [1-2 sentences]
ATTEMPTED: [what you tried]
RECOMMENDATION: [what the user should do next]

Telemetry (run last)

After the skill workflow completes (success, error, or abort), log the telemetry event. Determine the skill name from the name: field in this file's YAML frontmatter. Determine the outcome from the workflow result (success if completed normally, error if it failed, abort if the user interrupted).

PLAN MODE EXCEPTION — ALWAYS RUN: This command writes telemetry to ~/.gstack/analytics/ (user config directory, not project files). The skill preamble already writes to the same directory — this is the same pattern. Skipping this command loses session duration and outcome data.

Run this bash:

_TEL_END=$(date +%s)
_TEL_DUR=$(( _TEL_END - _TEL_START ))
rm -f ~/.gstack/analytics/.pending-"$_SESSION_ID" 2>/dev/null || true
~/.claude/skills/gstack/bin/gstack-telemetry-log \
  --skill "SKILL_NAME" --duration "$_TEL_DUR" --outcome "OUTCOME" \
  --used-browse "USED_BROWSE" --session-id "$_SESSION_ID" 2>/dev/null &

Replace SKILL_NAME with the actual skill name from frontmatter, OUTCOME with success/error/abort, and USED_BROWSE with true/false based on whether $B was used. If you cannot determine the outcome, use "unknown". This runs in the background and never blocks the user.

Plan Status Footer

When you are in plan mode and about to call ExitPlanMode:

1. Check if the plan file already has a ## GSTACK REVIEW REPORT section.
2. If it DOES — skip (a review skill already wrote a richer report).
3. If it does NOT — run this command:

```bash ~/.claude/skills/gstack/bin/gstack-review-read ```

Then write a ## GSTACK REVIEW REPORT section to the end of the plan file:

• If the output contains review entries (JSONL lines before ---CONFIG---): format the standard report table with runs/status/findings per skill, same format as the review skills use.
• If the output is NO_REVIEWS or empty: write this placeholder table:

```markdown

GSTACK REVIEW REPORT

Review	Trigger	Why	Runs	Status	Findings
CEO Review	`/plan-ceo-review`	Scope & strategy	0	—	—
Codex Review	`/codex review`	Independent 2nd opinion	0	—	—
Eng Review	`/plan-eng-review`	Architecture & tests (required)	0	—	—
Design Review	`/plan-design-review`	UI/UX gaps	0	—	—

VERDICT: NO REVIEWS YET — run `/autoplan` for full review pipeline, or individual reviews above. ```

PLAN MODE EXCEPTION — ALWAYS RUN: This writes to the plan file, which is the one file you are allowed to edit in plan mode. The plan file review report is part of the plan's living status.

Step 0: Detect base branch

Determine which branch this PR targets. Use the result as "the base branch" in all subsequent steps.

1. Check if a PR already exists for this branch: gh pr view --json baseRefName -q .baseRefName If this succeeds, use the printed branch name as the base branch.

2. If no PR exists (command fails), detect the repo's default branch: gh repo view --json defaultBranchRef -q .defaultBranchRef.name

3. If both commands fail, fall back to main.

Print the detected base branch name. In every subsequent git diff, git log, git fetch, git merge, and gh pr create command, substitute the detected branch name wherever the instructions say "the base branch."

---

Pre-Landing PR Review

You are running the /review workflow. Analyze the current branch's diff against the base branch for structural issues that tests don't catch.

---

Step 1: Check branch

1. Run git branch --show-current to get the current branch.
2. If on the base branch, output: "Nothing to review — you're on the base branch or have no changes against it." and stop.
3. Run git fetch origin <base> --quiet && git diff origin/<base> --stat to check if there's a diff. If no diff, output the same message and stop.

---

Step 1.5: Scope Drift Detection

Before reviewing code quality, check: did they build what was requested — nothing more, nothing less?

1. Read TODOS.md (if it exists). Read PR description (gh pr view --json body --jq .body 2>/dev/null || true). Read commit messages (git log origin/<base>..HEAD --oneline). If no PR exists: rely on commit messages and TODOS.md for stated intent — this is the common case since /review runs before /ship creates the PR.

2. Identify the stated intent — what was this branch supposed to accomplish?

3. Run git diff origin/<base>...HEAD --stat and compare the files changed against the stated intent.

4. Evaluate with skepticism:

   SCOPE CREEP detection:

   • Files changed that are unrelated to the stated intent
   • New features or refactors not mentioned in the plan
   • "While I was in there..." changes that expand blast radius

   MISSING REQUIREMENTS detection:

   • Requirements from TODOS.md/PR description not addressed in the diff
   • Test coverage gaps for stated requirements
   • Partial implementations (started but not finished)

5. Output (before the main review begins):

   Scope Check: [CLEAN / DRIFT DETECTED / REQUIREMENTS MISSING]
   Intent: <1-line summary of what was requested>
   Delivered: <1-line summary of what the diff actually does>
   [If drift: list each out-of-scope change]
   [If missing: list each unaddressed requirement]
   

6. This is INFORMATIONAL — does not block the review. Proceed to Step 2.

---

Step 2: Read the checklist

Read .claude/skills/review/checklist.md.

If the file cannot be read, STOP and report the error. Do not proceed without the checklist.

---

Step 2.5: Check for Greptile review comments

Read .claude/skills/review/greptile-triage.md and follow the fetch, filter, classify, and escalation detection steps.

If no PR exists, gh fails, API returns an error, or there are zero Greptile comments: Skip this step silently. Greptile integration is additive — the review works without it.

If Greptile comments are found: Store the classifications (VALID & ACTIONABLE, VALID BUT ALREADY FIXED, FALSE POSITIVE, SUPPRESSED) — you will need them in Step 5.

---

Step 3: Get the diff

Fetch the latest base branch to avoid false positives from stale local state:

git fetch origin <base> --quiet

Run git diff origin/<base> to get the full diff. This includes both committed and uncommitted changes against the latest base branch.

---

Step 4: Two-pass review

Apply the checklist against the diff in two passes:

1. Pass 1 (CRITICAL): SQL & Data Safety, Race Conditions & Concurrency, LLM Output Trust Boundary, Enum & Value Completeness
2. Pass 2 (INFORMATIONAL): Conditional Side Effects, Magic Numbers & String Coupling, Dead Code & Consistency, LLM Prompt Issues, Test Gaps, View/Frontend, Performance & Bundle Impact

Enum & Value Completeness requires reading code OUTSIDE the diff. When the diff introduces a new enum value, status, tier, or type constant, use Grep to find all files that reference sibling values, then Read those files to check if the new value is handled. This is the one category where within-diff review is insufficient.

Search-before-recommending: When recommending a fix pattern (especially for concurrency, caching, auth, or framework-specific behavior):

• Verify the pattern is current best practice for the framework version in use
• Check if a built-in solution exists in newer versions before recommending a workaround
• Verify API signatures against current docs (APIs change between versions)

Takes seconds, prevents recommending outdated patterns. If WebSearch is unavailable, note it and proceed with in-distribution knowledge.

Follow the output format specified in the checklist. Respect the suppressions — do NOT flag items listed in the "DO NOT flag" section.

---

Step 4.5: Design Review (conditional)

Design Review (conditional, diff-scoped)

Check if the diff touches frontend files using gstack-diff-scope:

source <(~/.claude/skills/gstack/bin/gstack-diff-scope <base> 2>/dev/null)

If SCOPE_FRONTEND=false: Skip design review silently. No output.

If SCOPE_FRONTEND=true:

1. Check for DESIGN.md. If DESIGN.md or design-system.md exists in the repo root, read it. All design findings are calibrated against it — patterns blessed in DESIGN.md are not flagged. If not found, use universal design principles.

2. Read .claude/skills/review/design-checklist.md. If the file cannot be read, skip design review with a note: "Design checklist not found — skipping design review."

3. Read each changed frontend file (full file, not just diff hunks). Frontend files are identified by the patterns listed in the checklist.

4. Apply the design checklist against the changed files. For each item:

   • [HIGH] mechanical CSS fix (outline: none, !important, font-size < 16px): classify as AUTO-FIX
   • [HIGH/MEDIUM] design judgment needed: classify as ASK
   • [LOW] intent-based detection: present as "Possible — verify visually or run /design-review"

5. Include findings in the review output under a "Design Review" header, following the output format in the checklist. Design findings merge with code review findings into the same Fix-First flow.

6. Log the result for the Review Readiness Dashboard:

~/.claude/skills/gstack/bin/gstack-review-log '{"skill":"design-review-lite","timestamp":"TIMESTAMP","status":"STATUS","findings":N,"auto_fixed":M,"commit":"COMMIT"}'

Substitute: TIMESTAMP = ISO 8601 datetime, STATUS = "clean" if 0 findings or "issues_found", N = total findings, M = auto-fixed count, COMMIT = output of git rev-parse --short HEAD.

7. Codex design voice (optional, automatic if available):

which codex 2>/dev/null && echo "CODEX_AVAILABLE" || echo "CODEX_NOT_AVAILABLE"

If Codex is available, run a lightweight design check on the diff:

TMPERR_DRL=$(mktemp /tmp/codex-drl-XXXXXXXX)
codex exec "Review the git diff on this branch. Run 7 litmus checks (YES/NO each): 1. Brand/product unmistakable in first screen? 2. One strong visual anchor present? 3. Page understandable by scanning headlines only? 4. Each section has one job? 5. Are cards actually necessary? 6. Does motion improve hierarchy or atmosphere? 7. Would design feel premium with all decorative shadows removed? Flag any hard rejections: 1. Generic SaaS card grid as first impression 2. Beautiful image with weak brand 3. Strong headline with no clear action 4. Busy imagery behind text 5. Sections repeating same mood statement 6. Carousel with no narrative purpose 7. App UI made of stacked cards instead of layout 5 most important design findings only. Reference file:line." -s read-only -c 'model_reasoning_effort="high"' --enable web_search_cached 2>"$TMPERR_DRL"

Use a 5-minute timeout (timeout: 300000). After the command completes, read stderr:

cat "$TMPERR_DRL" && rm -f "$TMPERR_DRL"

Error handling: All errors are non-blocking. On auth failure, timeout, or empty response — skip with a brief note and continue.

Present Codex output under a CODEX (design): header, merged with the checklist findings above.

Include any design findings alongside the findings from Step 4. They follow the same Fix-First flow in Step 5 — AUTO-FIX for mechanical CSS fixes, ASK for everything else.

---

Step 4.75: Test Coverage Diagram

100% coverage is the goal. Evaluate every codepath changed in the diff and identify test gaps. Gaps become INFORMATIONAL findings that follow the Fix-First flow.

Test Framework Detection

Before analyzing coverage, detect the project's test framework:

1. Read CLAUDE.md — look for a ## Testing section with test command and framework name. If found, use that as the authoritative source.
2. If CLAUDE.md has no testing section, auto-detect:

# Detect project runtime
[ -f Gemfile ] && echo "RUNTIME:ruby"
[ -f package.json ] && echo "RUNTIME:node"
[ -f requirements.txt ] || [ -f pyproject.toml ] && echo "RUNTIME:python"
[ -f go.mod ] && echo "RUNTIME:go"
[ -f Cargo.toml ] && echo "RUNTIME:rust"
# Check for existing test infrastructure
ls jest.config.* vitest.config.* playwright.config.* cypress.config.* .rspec pytest.ini phpunit.xml 2>/dev/null
ls -d test/ tests/ spec/ __tests__/ cypress/ e2e/ 2>/dev/null

3. If no framework detected: still produce the coverage diagram, but skip test generation.

Step 1. Trace every codepath changed using git diff origin/<base>...HEAD:

Read every changed file. For each one, trace how data flows through the code — don't just list functions, actually follow the execution:

1. Read the diff. For each changed file, read the full file (not just the diff hunk) to understand context.
2. Trace data flow. Starting from each entry point (route handler, exported function, event listener, component render), follow the data through every branch:
   • Where does input come from? (request params, props, database, API call)
   • What transforms it? (validation, mapping, computation)
   • Where does it go? (database write, API response, rendered output, side effect)
   • What can go wrong at each step? (null/undefined, invalid input, network failure, empty collection)
3. Diagram the execution. For each changed file, draw an ASCII diagram showing:
   • Every function/method that was added or modified
   • Every conditional branch (if/else, switch, ternary, guard clause, early return)
   • Every error path (try/catch, rescue, error boundary, fallback)
   • Every call to another function (trace into it — does IT have untested branches?)
   • Every edge: what happens with null input? Empty array? Invalid type?

This is the critical step — you're building a map of every line of code that can execute differently based on input. Every branch in this diagram needs a test.

Step 2. Map user flows, interactions, and error states:

Code coverage isn't enough — you need to cover how real users interact with the changed code. For each changed feature, think through:

• User flows: What sequence of actions does a user take that touches this code? Map the full journey (e.g., "user clicks 'Pay' → form validates → API call → success/failure screen"). Each step in the journey needs a test.
• Interaction edge cases: What happens when the user does something unexpected?
  • Double-click/rapid resubmit
  • Navigate away mid-operation (back button, close tab, click another link)
  • Submit with stale data (page sat open for 30 minutes, session expired)
  • Slow connection (API takes 10 seconds — what does the user see?)
  • Concurrent actions (two tabs, same form)
• Error states the user can see: For every error the code handles, what does the user actually experience?
  • Is there a clear error message or a silent failure?
  • Can the user recover (retry, go back, fix input) or are they stuck?
  • What happens with no network? With a 500 from the API? With invalid data from the server?
• Empty/zero/boundary states: What does the UI show with zero results? With 10,000 results? With a single character input? With maximum-length input?

Add these to your diagram alongside the code branches. A user flow with no test is just as much a gap as an untested if/else.

Step 3. Check each branch against existing tests:

Go through your diagram branch by branch — both code paths AND user flows. For each one, search for a test that exercises it:

• Function processPayment() → look for billing.test.ts, billing.spec.ts, test/billing_test.rb
• An if/else → look for tests covering BOTH the true AND false path
• An error handler → look for a test that triggers that specific error condition
• A call to helperFn() that has its own branches → those branches need tests too
• A user flow → look for an integration or E2E test that walks through the journey
• An interaction edge case → look for a test that simulates the unexpected action

Quality scoring rubric:

• ★★★ Tests behavior with edge cases AND error paths
• ★★ Tests correct behavior, happy path only
• ★ Smoke test / existence check / trivial assertion (e.g., "it renders", "it doesn't throw")

E2E Test Decision Matrix

When checking each branch, also determine whether a unit test or E2E/integration test is the right tool:

RECOMMEND E2E (mark as [→E2E] in the diagram):

• Common user flow spanning 3+ components/services (e.g., signup → verify email → first login)
• Integration point where mocking hides real failures (e.g., API → queue → worker → DB)
• Auth/payment/data-destruction flows — too important to trust unit tests alone

RECOMMEND EVAL (mark as [→EVAL] in the diagram):

• Critical LLM call that needs a quality eval (e.g., prompt change → test output still meets quality bar)
• Changes to prompt templates, system instructions, or tool definitions

STICK WITH UNIT TESTS:

• Pure function with clear inputs/outputs
• Internal helper with no side effects
• Edge case of a single function (null input, empty array)
• Obscure/rare flow that isn't customer-facing

REGRESSION RULE (mandatory)

IRON RULE: When the coverage audit identifies a REGRESSION — code that previously worked but the diff broke — a regression test is written immediately. No AskUserQuestion. No skipping. Regressions are the highest-priority test because they prove something broke.

A regression is when:

• The diff modifies existing behavior (not new code)
• The existing test suite (if any) doesn't cover the changed path
• The change introduces a new failure mode for existing callers

When uncertain whether a change is a regression, err on the side of writing the test.

Format: commit as test: regression test for {what broke}

Step 4. Output ASCII coverage diagram:

Include BOTH code paths and user flows in the same diagram. Mark E2E-worthy and eval-worthy paths:

CODE PATH COVERAGE
===========================
[+] src/services/billing.ts
    │
    ├── processPayment()
    │   ├── [★★★ TESTED] Happy path + card declined + timeout — billing.test.ts:42
    │   ├── [GAP]         Network timeout — NO TEST
    │   └── [GAP]         Invalid currency — NO TEST
    │
    └── refundPayment()
        ├── [★★  TESTED] Full refund — billing.test.ts:89
        └── [★   TESTED] Partial refund (checks non-throw only) — billing.test.ts:101

USER FLOW COVERAGE
===========================
[+] Payment checkout flow
    │
    ├── [★★★ TESTED] Complete purchase — checkout.e2e.ts:15
    ├── [GAP] [→E2E] Double-click submit — needs E2E, not just unit
    ├── [GAP]         Navigate away during payment — unit test sufficient
    └── [★   TESTED]  Form validation errors (checks render only) — checkout.test.ts:40

[+] Error states
    │
    ├── [★★  TESTED] Card declined message — billing.test.ts:58
    ├── [GAP]         Network timeout UX (what does user see?) — NO TEST
    └── [GAP]         Empty cart submission — NO TEST

[+] LLM integration
    │
    └── [GAP] [→EVAL] Prompt template change — needs eval test

─────────────────────────────────
COVERAGE: 5/13 paths tested (38%)
  Code paths: 3/5 (60%)
  User flows: 2/8 (25%)
QUALITY:  ★★★: 2  ★★: 2  ★: 1
GAPS: 8 paths need tests (2 need E2E, 1 needs eval)
─────────────────────────────────

Fast path: All paths covered → "Step 4.75: All new code paths have test coverage ✓" Continue.

Step 5. Generate tests for gaps (Fix-First):

If test framework is detected and gaps were identified:

• Classify each gap as AUTO-FIX or ASK per the Fix-First Heuristic:
  • AUTO-FIX: Simple unit tests for pure functions, edge cases of existing tested functions
  • ASK: E2E tests, tests requiring new test infrastructure, tests for ambiguous behavior
• For AUTO-FIX gaps: generate the test, run it, commit as test: coverage for {feature}
• For ASK gaps: include in the Fix-First batch question with the other review findings
• For paths marked [→E2E]: always ASK (E2E tests are higher-effort and need user confirmation)
• For paths marked [→EVAL]: always ASK (eval tests need user confirmation on quality criteria)

If no test framework detected → include gaps as INFORMATIONAL findings only, no generation.

Diff is test-only changes: Skip Step 4.75 entirely: "No new application code paths to audit."

This step subsumes the "Test Gaps" category from Pass 2 — do not duplicate findings between the checklist Test Gaps item and this coverage diagram. Include any coverage gaps alongside the findings from Step 4 and Step 4.5. They follow the same Fix-First flow — gaps are INFORMATIONAL findings.

---

Step 5: Fix-First Review

Every finding gets action — not just critical ones.

Output a summary header: Pre-Landing Review: N issues (X critical, Y informational)

Step 5a: Classify each finding

For each finding, classify as AUTO-FIX or ASK per the Fix-First Heuristic in checklist.md. Critical findings lean toward ASK; informational findings lean toward AUTO-FIX.

Step 5b: Auto-fix all AUTO-FIX items

Apply each fix directly. For each one, output a one-line summary: [AUTO-FIXED] [file:line] Problem → what you did

Step 5c: Batch-ask about ASK items

If there are ASK items remaining, present them in ONE AskUserQuestion:

• List each item with a number, the severity label, the problem, and a recommended fix
• For each item, provide options: A) Fix as recommended, B) Skip
• Include an overall RECOMMENDATION

Example format:

I auto-fixed 5 issues. 2 need your input:

1. [CRITICAL] app/models/post.rb:42 — Race condition in status transition
   Fix: Add `WHERE status = 'draft'` to the UPDATE
   → A) Fix  B) Skip

2. [INFORMATIONAL] app/services/generator.rb:88 — LLM output not type-checked before DB write
   Fix: Add JSON schema validation
   → A) Fix  B) Skip

RECOMMENDATION: Fix both — #1 is a real race condition, #2 prevents silent data corruption.

If 3 or fewer ASK items, you may use individual AskUserQuestion calls instead of batching.

Step 5d: Apply user-approved fixes

Apply fixes for items where the user chose "Fix." Output what was fixed.

If no ASK items exist (everything was AUTO-FIX), skip the question entirely.

Verification of claims

Before producing the final review output:

• If you claim "this pattern is safe" → cite the specific line proving safety
• If you claim "this is handled elsewhere" → read and cite the handling code
• If you claim "tests cover this" → name the test file and method
• Never say "likely handled" or "probably tested" — verify or flag as unknown

Rationalization prevention: "This looks fine" is not a finding. Either cite evidence it IS fine, or flag it as unverified.

Greptile comment resolution

After outputting your own findings, if Greptile comments were classified in Step 2.5:

Include a Greptile summary in your output header: + N Greptile comments (X valid, Y fixed, Z FP)

Before replying to any comment, run the Escalation Detection algorithm from greptile-triage.md to determine whether to use Tier 1 (friendly) or Tier 2 (firm) reply templates.

1. VALID & ACTIONABLE comments: These are included in your findings — they follow the Fix-First flow (auto-fixed if mechanical, batched into ASK if not) (A: Fix it now, B: Acknowledge, C: False positive). If the user chooses A (fix), reply using the Fix reply template from greptile-triage.md (include inline diff + explanation). If the user chooses C (false positive), reply using the False Positive reply template (include evidence + suggested re-rank), save to both per-project and global greptile-history.

2. FALSE POSITIVE comments: Present each one via AskUserQuestion:

   • Show the Greptile comment: file:line (or [top-level]) + body summary + permalink URL
   • Explain concisely why it's a false positive
   • Options:
     • A) Reply to Greptile explaining why this is incorrect (recommended if clearly wrong)
     • B) Fix it anyway (if low-effort and harmless)
     • C) Ignore — don't reply, don't fix

   If the user chooses A, reply using the False Positive reply template from greptile-triage.md (include evidence + suggested re-rank), save to both per-project and global greptile-history.

3. VALID BUT ALREADY FIXED comments: Reply using the Already Fixed reply template from greptile-triage.md — no AskUserQuestion needed:

   • Include what was done and the fixing commit SHA
   • Save to both per-project and global greptile-history

4. SUPPRESSED comments: Skip silently — these are known false positives from previous triage.

---

Step 5.5: TODOS cross-reference

Read TODOS.md in the repository root (if it exists). Cross-reference the PR against open TODOs:

• Does this PR close any open TODOs? If yes, note which items in your output: "This PR addresses TODO: "
• Does this PR create work that should become a TODO? If yes, flag it as an informational finding.
• Are there related TODOs that provide context for this review? If yes, reference them when discussing related findings.

If TODOS.md doesn't exist, skip this step silently.

---

Step 5.6: Documentation staleness check

Cross-reference the diff against documentation files. For each .md file in the repo root (README.md, ARCHITECTURE.md, CONTRIBUTING.md, CLAUDE.md, etc.):

1. Check if code changes in the diff affect features, components, or workflows described in that doc file.
2. If the doc file was NOT updated in this branch but the code it describes WAS changed, flag it as an INFORMATIONAL finding: "Documentation may be stale: [file] describes [feature/component] but code changed in this branch. Consider running /document-release."

This is informational only — never critical. The fix action is /document-release.

If no documentation files exist, skip this step silently.

---

Step 5.7: Adversarial review (auto-scaled)

Adversarial review thoroughness scales automatically based on diff size. No configuration needed.

Detect diff size and tool availability:

DIFF_INS=$(git diff origin/<base> --stat | tail -1 | grep -oE '[0-9]+ insertion' | grep -oE '[0-9]+' || echo "0")
DIFF_DEL=$(git diff origin/<base> --stat | tail -1 | grep -oE '[0-9]+ deletion' | grep -oE '[0-9]+' || echo "0")
DIFF_TOTAL=$((DIFF_INS + DIFF_DEL))
which codex 2>/dev/null && echo "CODEX_AVAILABLE" || echo "CODEX_NOT_AVAILABLE"
# Respect old opt-out
OLD_CFG=$(~/.claude/skills/gstack/bin/gstack-config get codex_reviews 2>/dev/null || true)
echo "DIFF_SIZE: $DIFF_TOTAL"
echo "OLD_CFG: ${OLD_CFG:-not_set}"

If OLD_CFG is disabled: skip this step silently. Continue to the next step.

User override: If the user explicitly requested a specific tier (e.g., "run all passes", "paranoid review", "full adversarial", "do all 4 passes", "thorough review"), honor that request regardless of diff size. Jump to the matching tier section.

Auto-select tier based on diff size:

• Small (< 50 lines changed): Skip adversarial review entirely. Print: "Small diff ($DIFF_TOTAL lines) — adversarial review skipped." Continue to the next step.
• Medium (50–199 lines changed): Run Codex adversarial challenge (or Claude adversarial subagent if Codex unavailable). Jump to the "Medium tier" section.
• Large (200+ lines changed): Run all remaining passes — Codex structured review + Claude adversarial subagent + Codex adversarial. Jump to the "Large tier" section.

---

Medium tier (50–199 lines)

Claude's structured review already ran. Now add a cross-model adversarial challenge.

If Codex is available: run the Codex adversarial challenge. If Codex is NOT available: fall back to the Claude adversarial subagent instead.

Codex adversarial:

TMPERR_ADV=$(mktemp /tmp/codex-adv-XXXXXXXX)
codex exec "Review the changes on this branch against the base branch. Run git diff origin/<base> to see the diff. Your job is to find ways this code will fail in production. Think like an attacker and a chaos engineer. Find edge cases, race conditions, security holes, resource leaks, failure modes, and silent data corruption paths. Be adversarial. Be thorough. No compliments — just the problems." -s read-only -c 'model_reasoning_effort="xhigh"' --enable web_search_cached 2>"$TMPERR_ADV"

Set the Bash tool's timeout parameter to 300000 (5 minutes). Do NOT use the timeout shell command — it doesn't exist on macOS. After the command completes, read stderr:

cat "$TMPERR_ADV"

Present the full output verbatim. This is informational — it never blocks shipping.

Error handling: All errors are non-blocking — adversarial review is a quality enhancement, not a prerequisite.

• Auth failure: If stderr contains "auth", "login", "unauthorized", or "API key": "Codex authentication failed. Run `codex login` to authenticate."
• Timeout: "Codex timed out after 5 minutes."
• Empty response: "Codex returned no response. Stderr: ."

On any Codex error, fall back to the Claude adversarial subagent automatically.

Claude adversarial subagent (fallback when Codex unavailable or errored):

Dispatch via the Agent tool. The subagent has fresh context — no checklist bias from the structured review. This genuine independence catches things the primary reviewer is blind to.

Subagent prompt: "Read the diff for this branch with git diff origin/<base>. Think like an attacker and a chaos engineer. Your job is to find ways this code will fail in production. Look for: edge cases, race conditions, security holes, resource leaks, failure modes, silent data corruption, logic errors that produce wrong results silently, error handling that swallows failures, and trust boundary violations. Be adversarial. Be thorough. No compliments — just the problems. For each finding, classify as FIXABLE (you know how to fix it) or INVESTIGATE (needs human judgment)."

Present findings under an ADVERSARIAL REVIEW (Claude subagent): header. FIXABLE findings flow into the same Fix-First pipeline as the structured review. INVESTIGATE findings are presented as informational.

If the subagent fails or times out: "Claude adversarial subagent unavailable. Continuing without adversarial review."

Persist the review result:

~/.claude/skills/gstack/bin/gstack-review-log '{"skill":"adversarial-review","timestamp":"'"$(date -u +%Y-%m-%dT%H:%M:%SZ)"'","status":"STATUS","source":"SOURCE","tier":"medium","commit":"'"$(git rev-parse --short HEAD)"'"}'

Substitute STATUS: "clean" if no findings, "issues_found" if findings exist. SOURCE: "codex" if Codex ran, "claude" if subagent ran. If both failed, do NOT persist.

Cleanup: Run rm -f "$TMPERR_ADV" after processing (if Codex was used).

---

Large tier (200+ lines)

Claude's structured review already ran. Now run all three remaining passes for maximum coverage:

1. Codex structured review (if available):

TMPERR=$(mktemp /tmp/codex-review-XXXXXXXX)
codex review --base <base> -c 'model_reasoning_effort="xhigh"' --enable web_search_cached 2>"$TMPERR"

Set the Bash tool's timeout parameter to 300000 (5 minutes). Do NOT use the timeout shell command — it doesn't exist on macOS. Present output under CODEX SAYS (code review): header. Check for [P1] markers: found → GATE: FAIL, not found → GATE: PASS.

If GATE is FAIL, use AskUserQuestion:

Codex found N critical issues in the diff.

A) Investigate and fix now (recommended)
B) Continue — review will still complete

If A: address the findings. Re-run codex review to verify.

Read stderr for errors (same error handling as medium tier).

After stderr: rm -f "$TMPERR"

2. Claude adversarial subagent: Dispatch a subagent with the adversarial prompt (same prompt as medium tier). This always runs regardless of Codex availability.

3. Codex adversarial challenge (if available): Run codex exec with the adversarial prompt (same as medium tier).

If Codex is not available for steps 1 and 3, note to the user: "Codex CLI not found — large-diff review ran Claude structured + Claude adversarial (2 of 4 passes). Install Codex for full 4-pass coverage: npm install -g @openai/codex"

Persist the review result AFTER all passes complete (not after each sub-step):

~/.claude/skills/gstack/bin/gstack-review-log '{"skill":"adversarial-review","timestamp":"'"$(date -u +%Y-%m-%dT%H:%M:%SZ)"'","status":"STATUS","source":"SOURCE","tier":"large","gate":"GATE","commit":"'"$(git rev-parse --short HEAD)"'"}'

Substitute: STATUS = "clean" if no findings across ALL passes, "issues_found" if any pass found issues. SOURCE = "both" if Codex ran, "claude" if only Claude subagent ran. GATE = the Codex structured review gate result ("pass"/"fail"), or "informational" if Codex was unavailable. If all passes failed, do NOT persist.

---

Cross-model synthesis (medium and large tiers)

After all passes complete, synthesize findings across all sources:

ADVERSARIAL REVIEW SYNTHESIS (auto: TIER, N lines):
════════════════════════════════════════════════════════════
  High confidence (found by multiple sources): [findings agreed on by >1 pass]
  Unique to Claude structured review: [from earlier step]
  Unique to Claude adversarial: [from subagent, if ran]
  Unique to Codex: [from codex adversarial or code review, if ran]
  Models used: Claude structured ✓  Claude adversarial ✓/✗  Codex ✓/✗
════════════════════════════════════════════════════════════

High-confidence findings (agreed on by multiple sources) should be prioritized for fixes.

---

Step 5.8: Persist Eng Review result

After all review passes complete, persist the final /review outcome so /ship can recognize that Eng Review was run on this branch.

Run:

~/.claude/skills/gstack/bin/gstack-review-log '{"skill":"review","timestamp":"TIMESTAMP","status":"STATUS","issues_found":N,"critical":N,"informational":N,"commit":"COMMIT"}'

Substitute:

• TIMESTAMP = ISO 8601 datetime
• STATUS = "clean" if there are no remaining unresolved findings after Fix-First handling and adversarial review, otherwise "issues_found"
• issues_found = total remaining unresolved findings
• critical = remaining unresolved critical findings
• informational = remaining unresolved informational findings
• COMMIT = output of git rev-parse --short HEAD

If the review exits early before a real review completes (for example, no diff against the base branch), do not write this entry.

Important Rules

• Read the FULL diff before commenting. Do not flag issues already addressed in the diff.
• Fix-first, not read-only. AUTO-FIX items are applied directly. ASK items are only applied after user approval. Never commit, push, or create PRs — that's /ship's job.
• Be terse. One line problem, one line fix. No preamble.
• Only flag real problems. Skip anything that's fine.
• Use Greptile reply templates from greptile-triage.md. Every reply includes evidence. Never post vague replies.