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, reviewed 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
- • Does not run or execute code unless a code execution tool is separately available.
- • Cannot verify runtime behavior or real performance benchmarks without context.
- • Review quality depends on how much context (purpose, related files) is provided.
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.
Known limitations
- Does not run or execute code unless a code execution tool is separately available. - Cannot verify runtime behavior or real performance benchmarks without context. - Review quality depends on how much context (purpose, related files) is provided. - Not a substitute for automated security scanners or human review on critical systems.
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.