Code Review Assistant Skill
A practical AI code reviewer that finds bugs, security risks, and readability issues — and explains why each one matters.
Code Review Assistant Skill is a free AI skill for code improvement. A practical AI code reviewer that finds bugs, security risks, and readability issues — and explains why each one matters. It works with Claude, Claude Code, Cowork and is ready to use out of the box.
- • Reviewing a pull request before merge
- • Auditing an endpoint for security issues
- • Explaining why a function is buggy in plain language
About this skill
Code Review Assistant Skill turns Claude into a careful, structured code reviewer. It checks code for correctness, security vulnerabilities, performance problems, readability, maintainability, and test coverage, then delivers a clear report that separates confirmed issues from possible ones. It's built for both professional developers reviewing production code and "vibe coders" using AI tools to build projects who want a second pair of eyes before shipping.
What it does
Reviews code for bugs, security issues, performance, readability, maintainability, and missing test coverage — with a structured report that separates confirmed issues from possible ones and explains why each matters.
Use cases
- Reviewing a pull request before merge
- Auditing an endpoint for security issues
- Explaining why a function is buggy in plain language
- Refactoring long or unclear code safely
- Spot-checking AI-generated code before shipping
- Debugging a failing function with a structured trace
What is included
- SKILL.md
- workflow.md
- code-review-checklist.md
- output-templates.md
- examples.md
- piskill-page-content.md
How to use it
1. Download the ZIP using the Download button. 2. Unzip the code-review-assistant-skill folder. 3. Load SKILL.md into your Claude-compatible interface as a skill / system prompt. 4. Paste the code you want reviewed and (optionally) specify the review type.
Examples
Review this function for security issues:
app.post('/login', (req, res) => {
const q = `SELECT * FROM users WHERE email='${req.body.email}' AND pass='${req.body.password}'`;
db.query(q, (err, rows) => res.json(rows));
});## Security Review ### Confirmed Security Issues 1. SQL Injection via unsanitized email/password concatenation — fix with parameterized queries. 2. Passwords appear to be compared in plaintext — should be hashed and verified with bcrypt or similar. 3. Full user rows (including password hash) are returned to the client — return only necessary fields. ## Plain-Language Takeaway This login endpoint has serious security flaws that could let attackers bypass authentication or steal data — do not deploy as-is.
Quality and safety notes
- ✓ Separates confirmed issues from possible ones
- ✓ Explains reasoning, not just fixes
- ✓ Uses consistent output templates
- ✓ Never claims to have executed code without a tool
- Flags hardcoded secrets and credentials as top-priority.
- Refuses to write exploit code or disable security checks.
- Prefers the smallest safe fix; flags any change that alters public APIs.
FAQ
Does it actually run my code?
Will it rewrite my whole file?
Can it review any language?
Is it safe for beginners?
Related Prompts
Grammar, Style and Readability Editor Prompt
Checks grammar, style, readability, and wording while explaining the most important corrections.
Improve Clarity and Flow Prompt
Improves structure, readability, flow, and sentence clarity without changing the core message.