code-reviewer

name	code-reviewer
description	This skill guides the agent in conducting professional and thorough code reviews for both local development and remote Pull Requests. Use when this capability is needed.
metadata	{"author":"google-gemini"}

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:

1. Checkout: Use the GitHub CLI to checkout the PR.

   gh pr checkout <PR_NUMBER>
   

2. Preflight: Execute the project's standard verification suite to catch automated failures early.

   npm run preflight
   

3. Context: Read the PR description and any existing comments to understand the goal and history.

For Local Changes:

1. Identify Changes:
   • Check status: git status
   • Read diffs: git diff (working tree) and/or git diff --staged (staged).
2. 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).

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