Code Reviewer

A solid code reviewer that handles both local git changes and remote PRs through GitHub CLI. It runs your project's preflight checks first to catch the obvious stuff, then digs into correctness, maintainability, security, and test coverage. The structured feedback format separates critical issues from nitpicks, which helps prioritize fixes. What I like is that it actually explains the reasoning behind suggestions instead of just flagging problems. Works well for teams that want consistent review quality without the overhead of waiting for human reviewers on every small change.

skills.sh installs: 9.7K
GitHub stars: 108.7K
last updated: Aug 21, 2026

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Install

$ npx -y skills add google-gemini/gemini-cli --skill code-reviewer --agent claude-code

Installs into .claude/skills of the current project.

Files

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.