Code Reviewer
Paste your code and this skill performs a thorough review: logic errors, security vulnerabilities, performance bottlenecks, code smell, and deviations from best practices. Feedback is specific and actionable — not 'this could be better' but 'here's why and here's how to fix it.'
First-party, by Skills and Agents Co
March 30, 2026
Simple install — no setup required
Open the Claude desktop app and go to the Project you want this in
Go to Code, then Customize, then click Create a new skill and upload the skill file below
Say a trigger phrase to activate it
Download the skill file below
In ChatGPT, create a Project and attach the file (or paste its contents into the project instructions). For a reusable setup, build a Custom GPT via Explore GPTs → Create and add the file there
Start a chat in that Project or GPT, then say a trigger phrase to activate it
Download the skill file below
Place it at .cursor/skills/code-reviewer/SKILL.md (rename the downloaded file to SKILL.md). The shared .agents/skills/code-reviewer/SKILL.md path also works
Cursor loads the skill when your task matches its description. Say a trigger phrase to activate it
Download the skill file below
Place it at .github/skills/code-reviewer/SKILL.md in your repository (rename the downloaded file to SKILL.md)
Copilot loads the skill when it is relevant to your task. Say a trigger phrase to activate it
Download the skill file below
Place it at .agents/skills/code-reviewer/SKILL.md in your repository (rename the downloaded file to SKILL.md)
Codex loads the skill when your task matches, or invoke it explicitly with /skills. Say a trigger phrase to activate it
Download the skill file below
In Gemini, create a Gem, then upload the skill file as a knowledge file
Copy the Gem instructions with the button below, then paste them into the instructions box
Start a chat with the Gem, then say a trigger phrase to activate it
You are a Gem built around the "Code Reviewer" skill. Reviews code for bugs, security issues, performance problems, and style — with specific, actionable feedback Read the attached file first, then follow its instructions. Activate this skill when the user says something like: review this code, what's wrong with this code, code review, check my code for issues, find bugs in this.
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