code-reviewer

Name: code-reviewer - Agent Skill
Rating: 5.0 (92171 reviews)
Author: google-gemini

92,171

Use this skill to review code. It supports both local changes (staged or working tree) and remote Pull Requests (by ID or URL). It focuses on correctness, maintainability, and adherence to project standards.

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CLI Install

Recommended

Use the skills CLI to install this skill with one command. Auto-detects all installed AI assistants.

Method 1 - skills CLI

npx skills i google-gemini/gemini-cli/.gemini/skills/code-reviewer

Method 2 - openskills (supports sync & update)

npx openskills install google-gemini/gemini-cli

Auto-detects Claude Code, Cursor, Codex CLI, Gemini CLI, and more. One install, works everywhere.

Installation Path

Download and extract to one of the following locations:

~/.claude/skills/code-reviewer/

SKILL.md

Skill Instructions

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Claude Sonnet 4.5

$0.20/task

Best for coding tasks

No setup required

Code Reviewer

This skill guides the agent in conducting professional and thorough code reviews for both local development and remote Pull Requests.

Workflow

1. Determine Review Target

Remote PR: If the user provides a PR number or URL (e.g., "Review PR #123"), target that remote PR.
Local Changes: If no specific PR is mentioned, or if the user asks to "review my changes", target the current local file system states (staged and unstaged changes).

2. Preparation

For Remote PRs:

Checkout: Use the GitHub CLI to checkout the PR.
```
gh pr checkout <PR_NUMBER>
```
Preflight: Execute the project's standard verification suite to catch automated failures early.
```
npm run preflight
```
Context: Read the PR description and any existing comments to understand the goal and history.

For Local Changes:

Identify Changes:
- Check status: git status
- Read diffs: git diff (working tree) and/or git diff --staged (staged).
Preflight (Optional): If the changes are substantial, ask the user if they want to run npm run preflight before reviewing.

3. In-Depth Analysis

Analyze the code changes based on the following pillars:

Correctness: Does the code achieve its stated purpose without bugs or logical errors?
Maintainability: Is the code clean, well-structured, and easy to understand and modify in the future? Consider factors like code clarity, modularity, and adherence to established design patterns.
Readability: Is the code well-commented (where necessary) and consistently formatted according to our project's coding style guidelines?
Efficiency: Are there any obvious performance bottlenecks or resource inefficiencies introduced by the changes?
Security: Are there any potential security vulnerabilities or insecure coding practices?
Edge Cases and Error Handling: Does the code appropriately handle edge cases and potential errors?
Testability: Is the new or modified code adequately covered by tests (even if preflight checks pass)? Suggest additional test cases that would improve coverage or robustness.

4. Provide Feedback

Structure

Summary: A high-level overview of the review.
Findings:
- Critical: Bugs, security issues, or breaking changes.
- Improvements: Suggestions for better code quality or performance.
- Nitpicks: Formatting or minor style issues (optional).
Conclusion: Clear recommendation (Approved / Request Changes).

Tone

Be constructive, professional, and friendly.
Explain why a change is requested.
For approvals, acknowledge the specific value of the contribution.

5. Cleanup (Remote PRs only)

After the review, ask the user if they want to switch back to the default branch (e.g., main or master).