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Google Code Reviewer Skill

Use this skill to perform a structured, high-signal code review inspired by Google Engineering Practices.

Default Mode

• Strictness profile: Balanced.
• Output language: English.
• Comment labeling: Required, Nit, Optional, FYI.

Inputs To Request

• Change context: PR/CL link, summary, related issue/design doc.
• Scope: files to review and any explicit ownership boundaries.
• Risk profile: user-facing impact, security, privacy, data integrity, performance, concurrency.
• Constraints: release deadlines, emergency status, reviewer turnaround expectations.

Review Standard

• Approve when the change clearly improves overall code health, even if not perfect.
• Do not approve if code health clearly regresses, except true emergencies.
• Prefer evidence, style guide rules, and engineering principles over personal preference.

Workflow

1. Triage the CL.

• Check if the change should happen at all.
• Read description for clear "what" and "why".
• If direction is wrong, stop early and suggest a better direction.

1. Review high-leverage parts first.

• Find core files and design decisions.
• Send major design concerns immediately without waiting for full pass.

1. Review all assigned code in sequence.

• Cover every human-written line in assigned scope.
• Pull broader file/system context when local diff is insufficient.

1. Evaluate quality dimensions.

• Design: architecture fit, boundaries, extensibility without over-engineering.
• Functionality: correctness, edge cases, failure modes, UX impact.
• Concurrency and safety: race/deadlock risk, state consistency.
• Complexity: readability, maintainability, avoid speculative abstractions.
• Tests: right level, useful assertions, failure sensitivity, maintainable tests.
• Naming/comments/docs: clear names, comments explain why, docs updated when behavior changes.
• Style/consistency: follow style guides first, then local consistency.

1. Write review comments with explicit severity.

• Required: must change before approval.
• Nit: polish, non-blocking.
• Optional: suggestion, author can choose.
• FYI: informational only.
• Be respectful, explain reasoning, and compliment strong work when present.

1. Decide review outcome.

• Approve/LGTM: no blocking concerns.
• LGTM with comments: only minor non-blocking points remain and author is likely to apply them.
• Request changes: blocking issues remain.
• For partial reviews, state exactly what was reviewed and what was not.

1. Keep review latency low.

• Target a quick first response and short response loops.
• Maximum normal response time target: within one business day.
• If busy, acknowledge and provide ETA or suggest alternate reviewer.
• For oversized CLs, ask to split into smaller self-contained changes.

Branching Logic

• Large CL and no fast full review possible: request split first; if unavoidable, provide immediate high-level design feedback.
• Major design flaw found early: send that feedback immediately; avoid deep nits until direction is settled.
• Style-only disagreement not in style guide: treat as preference, usually non-blocking.
• Multiple reviewers: state your reviewed scope explicitly.
• Time-zone delay risk: prefer LGTM with comments when only minor issues remain.

Completion Checklist

• Outcome stated clearly (approve, lgtm-with-comments, or changes requested).
• Blocking vs non-blocking comments are clearly labeled.
• Comments focus on code and rationale, not person.
• Review explicitly covers design, tests, and maintainability.
• Any missing docs/tests are called out.
• If scope was partial, reviewed scope is documented.

Output Format

• Verdict: one-line decision.
• Blocking Findings: numbered, each with file/path reference and why it matters.
• Non-Blocking Suggestions: numbered and severity-labeled.
• Positives: concrete good practices observed.
• Scope Note: what you did and did not review.

Assets

• Use review output template when generating structured review feedback.

Extra References

• Use eng-practices map to select source docs by review situation.

References

• ./references/eng-practices-full/review/reviewer/index.md
• ./references/eng-practices-full/review/reviewer/standard.md
• ./references/eng-practices-full/review/reviewer/looking-for.md
• ./references/eng-practices-full/review/reviewer/navigate.md
• ./references/eng-practices-full/review/reviewer/speed.md
• ./references/eng-practices-full/review/reviewer/comments.md

Weekly Installs

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Repository

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First Seen

1 day ago

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