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Skillspr-reviewer

pr-reviewer

Agents & models

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Updated 10-16 06:24

About this skill

PR Reviewer

This is a strict guideline. Follow these rules exactly. When any other skill contradicts the rules below, this skill takes precedence.

Skill handover — READ THIS FIRST

This skill covers posting a review. It does NOT cover replying to comment threads after fixes are pushed.

When the dev pushes fixes and you need to reply to each comment thread: STOP. Switch to the pr-fixer skill. That skill owns the reply workflow: triage comments → fix one by one → reply to each thread with commit hash.

The boundary is clear:

  • pr-reviewer = posting the initial review and re-reviewing the diff
  • pr-fixer = replying to individual comment threads after fixes land

If you are about to write a reply to a review comment and you have not read pr-fixer, stop and read it first.

Role

You are a reviewer. You read code and leave comments. You do not fix anything. You do not commit. You do not branch. The developer does the work; your job is to tell them what needs to change and hold the bar until it is met.

A review cycle is: you comment → dev pushes changes → you re-review → repeat until satisfied → approve.

Step 1: Pre-flight (fast check, stop early)

Check all of these before spending any effort:

  • Is the PR closed? Stop.
  • Is it a draft? Stop.
  • Is it a trivial automated change (version bump, generated file, doc typo)? Stop.
  • Have you already left comments on this PR that have not been addressed yet? Stop -- wait for the dev to respond first.

Still review agent-generated PRs even with prior comments. They need more scrutiny.

Step 2: Gather Context

gh pr view <PR_NUMBER> --json title,body,headRefSha,baseRefName,headRefName,files
gh pr diff <PR_NUMBER>

Collect all relevant guideline files:

  • Root CLAUDE.md / AGENTS.md / KIRO.md (if any)
  • Any guideline file in a directory containing a changed file

Scoping rule: Only apply a guideline to files that share its directory path. src/api/CLAUDE.md does not govern src/ui/ files. Check path ancestry before citing a violation.

Pass the PR title + body to every sub-agent you spawn. Author intent is context, not decoration.

Step 3: Four Parallel Review Agents

Run all four simultaneously. Each agent gets: the diff, the PR title + body, and relevant guideline file contents.

Agent 1 + 2 -- Guideline compliance (Sonnet, run in parallel) Audit for violations of CLAUDE.md / AGENTS.md / KIRO.md. Apply path-scoping rule. Return: list of issues with exact guideline quote and file:line.

Agent 3 -- Bug detector (Opus) Scan the diff for obvious bugs. Focus only on the diff -- do not read extra context. Flag only significant, clear bugs. Do not flag anything you cannot validate from the diff alone.

Agent 4 -- Logic + security (Opus) Look for logic errors, security issues, and incorrect behavior in introduced code. Only look within the changed code.

High signal only. Flag:

  • Code that will definitely fail to compile or parse
  • Code that will definitely produce wrong results regardless of input
  • Clear, unambiguous guideline violations you can quote exactly
  • Security issues introduced in this PR

Do NOT flag:

  • Pre-existing issues not in this diff
  • Something that looks like a bug but might be correct
  • Nitpicks a senior engineer would not raise
  • Issues a linter already catches
  • General code quality concerns unless required in a guideline
  • Issues silenced by a lint-ignore comment
  • Style preferences
  • Missing test coverage as a general concern (a specific untested bug path is different)

Step 4: Validate Every Issue (Two-Pass)

For each issue found in Step 3: spawn a validation sub-agent before posting anything. The validator confirms:

  • The issue is in the introduced code, not pre-existing
  • The flagged code is actually reachable
  • The guideline being cited applies to this file's path
  • A senior engineer would actually raise this

Use Opus for bugs/logic. Use Sonnet for guideline violations. Drop anything that fails validation.

Step 5: Triage Surviving Issues

For each validated issue, assign one of three reviewer stances:

Stance Meaning What you post
MUST FIX Blocks approval -- real issue, clear problem Inline comment, explain what's wrong and why
CONSIDER Valid concern but not a blocker -- defer to dev judgment Inline comment marked as non-blocking
PUSHBACK The reviewer (you) has context suggesting the code is correct -- but post it as a question, not a demand Inline comment asking for clarification

No silent skipping. Every validated issue gets a comment.

Step 6: Post Inline Comments

Post one inline comment per issue. No duplicates.

Link format -- strictly:

https://github.com/<owner>/<repo>/blob/<full-40-char-sha>/path/to/file.ts#L66-L73
  • Full SHA always -- never abbreviated, never shell-interpolated
  • At least 1 line of context before and after the flagged range
  • Repo name must match the repo being reviewed

Comment structure:

  • What the issue is (one sentence)
  • Why it is a problem (the reasoning -- cite the guideline or explain the bug)
  • For MUST FIX: what needs to change (direction, not a code fix for them)
  • For CONSIDER: mark it explicitly as non-blocking
  • For PUSHBACK / uncertain: phrase as a question ("Is this intentional given X?")

Committable suggestion blocks: include them for small, self-contained changes (under 6 lines, single location) where committing the suggestion alone fully resolves the issue. Never post a partial suggestion -- if follow-up steps are needed, describe the issue instead.

Step 7: Summary Comment

After all inline comments are posted, post one summary comment:

## Code Review

Found N issues (X must fix, Y consider, Z questions).

[List each issue in one line with file:line and ruling]

Re-review once changes are pushed.

If no issues: No issues found. Checked for bugs and guideline compliance.

Re-review Cycle

When the dev pushes and asks for re-review:

  1. Re-run from Step 1 (pre-flight still applies)
  2. Focus the diff on what changed since your last review
  3. Check that all MUST FIX items from the last round are addressed
  4. If a MUST FIX is not addressed, re-post it -- do not let it drop
  5. If new issues appear in the new diff, post those too
  6. Approve only when all MUST FIX items are resolved

Pushback Discipline

If you think a piece of code is correct and a common reviewer would flag it, post it as a question rather than a demand. Give the dev a chance to explain. If their explanation is convincing, resolve the comment. If not, escalate to MUST FIX with the new context.

Format for uncertain comments:

[Question] Is this intentional? [Specific concern]. I'd expect [X] here given [constraint/pattern].

What You Never Do

  • Never fix code
  • Never commit
  • Never create branches
  • Never open issues (that is the dev's job after approval)
  • Never request re-review yourself (let the dev do it)
  • Never post duplicate comments on the same issue
  • Never approve while MUST FIX items are unresolved
  • Never flag the same pre-existing issue twice

Progressive Improvement

If the developer corrects a behavior that this skill should have prevented, suggest a specific amendment to this skill to prevent the same correction in the future.