Code Improvement

Code Review & Refactor Assistant

Reviews a pasted code snippet for bugs, readability, and performance issues, then delivers a prioritized refactor with explanations for each change.

Last updated Jul 11, 2026
FreeClaudeChatGPTCursor
TL;DR

Code Review & Refactor Assistant is a free AI skill for code improvement. Reviews a pasted code snippet for bugs, readability, and performance issues, then delivers a prioritized refactor with explanations for each change. It works with Claude, ChatGPT, Cursor and is ready to use out of the box.

Download Skill.md Package

About this skill

Code Review & Refactor Assistant performs a structured review of any pasted code snippet: it flags actual bugs and edge-case failures, readability and naming issues, and performance or complexity concerns, then produces a refactored version with inline comments explaining what changed and why. It's built to behave like a thoughtful senior engineer doing a pull request review — specific, prioritized, and focused on real issues rather than generic style nitpicks.

What it does

Given a code snippet in any common language, the skill outputs a categorized review (bugs, readability, performance), followed by a refactored version of the code with explanatory comments on each meaningful change.

What is included

  • Categorized review: bugs, readability, performance
  • Severity/priority ranking per issue
  • Fully refactored code with inline explanations
  • Language-agnostic — works across common languages
  • Pull-request-style review tone

How to use it

1. Download the SKILL.md file
2. Upload it to a new Claude conversation
3. Paste the code snippet you want reviewed
4. Receive a full review and refactored version

Examples

Example input
function getActiveUsers(users) {
  let result = []
  for (let i = 0; i < users.length; i++) {
    if (users[i].active == true) {
      result.push(users[i])
    }
  }
  return result
}
Example output
REVIEW:

BUGS: None functionally breaking, but == true is a loose equality risk if 'active' isn't strictly boolean (e.g. truthy string 'true'). Priority: Low

READABILITY: Manual for-loop with index access is less idiomatic than array methods; 'result' is a vague variable name. Priority: Medium

PERFORMANCE: No issues at typical scale; array methods below have equivalent performance for reasonable list sizes. Priority: N/A

REFACTORED CODE:
function getActiveUsers(users) {
  // Use .filter for clearer intent and to avoid manual loop bookkeeping
  return users.filter(user => user.active === true) // strict equality avoids truthy-value bugs
}

SUMMARY: Simplified from imperative loop to declarative filter, fixed loose equality, improved naming clarity via direct return.

FAQ

What is this skill for?
It reviews pasted code for bugs, readability, and performance issues, then provides a refactored version with explanations.
How do I install it?
Upload the SKILL.md file to a Claude conversation and paste the code you want reviewed.
What languages does it support?
It works across common languages including JavaScript, Python, TypeScript, Java, Go, and others — it adapts its review to the language provided.
Will it rewrite my entire codebase?
No, it reviews and refactors the specific snippet you paste — for larger codebases, paste relevant files or functions individually.
How is this different from a linter?
It reasons about actual bugs, logic issues, and design clarity like a human reviewer, not just style/syntax rules a linter would catch.
Does it explain why it made each change?
Yes, every meaningful change in the refactored code includes an inline comment explaining the reasoning.

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