Codebase Refactoring
Codebase Refactoring is an agent skill (a SKILL.md file) from kucherenko/jscpd. Three-part workflow to improve overall codebase health with jscpd — find and fix duplicated code, find and remove or refactor dead code, then find and simplify the largest/most complex files. It works with Claude Code and has 6,450 GitHub stars across a repository of 3 listed skills.
github.com/kucherenko/jscpd/skills/codebase-refactoring (opens in a new tab)
Data as of from the GitHub API; description from the skill's SKILL.md. Report an error
Add this skill
Claude
Claude Code loads skills from ~/.claude/skills/ (all projects) or .claude/skills/ (one project):
git clone --depth 1 https://github.com/kucherenko/jscpd.git
cp -r jscpd/skills/codebase-refactoring ~/.claude/skills/codebase-refactoring # personal, or .claude/skills in a projectIn the Claude apps, zip the codebase-refactoring folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).
ChatGPT / Codex
Codex reads skills from .agents/skills/ in a repo or ~/.agents/skills/ for every project:
git clone --depth 1 https://github.com/kucherenko/jscpd.git
cp -r jscpd/skills/codebase-refactoring .agents/skills/codebase-refactoring # repo; ~/.agents/skills for all projectsStandalone skills also load in the ChatGPT desktop app.
Cursor
Cursor loads skills from .cursor/skills/ (or ~/.cursor/skills/) and also reads .claude/skills/:
git clone --depth 1 https://github.com/kucherenko/jscpd.git
cp -r jscpd/skills/codebase-refactoring .cursor/skills/codebase-refactoring # project; ~/.cursor/skills for all projectsSource (checked Oct 7, 2026): code.claude.com/docs/en/skills (opens in a new tab), support.claude.com/en/articles/12512180-using-skills-in-claude (opens in a new tab), learn.chatgpt.com/docs/build-skills (opens in a new tab), cursor.com/docs/context/skills (opens in a new tab)
What this skill does
Three-part workflow to improve overall codebase health with jscpd — find and fix duplicated code, find and remove or refactor dead code, then find and simplify the largest/most complex files. Starts from --dashboard/--health to prioritize and ends by re-measuring the score. A guided pass over a codebase's three biggest maintenance costs — duplicated code, dead code, and complexity — using jscpd to find each and a strategy to fix it.
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How do I install the Codebase Refactoring skill?
Copy the codebase-refactoring folder (the one containing SKILL.md) into ~/.claude/skills/ for Claude Code, .agents/skills/ for Codex or .cursor/skills/ for Cursor. The agent picks it up automatically when a task matches its description.
Is the Codebase Refactoring skill free?
Yes. The repository is open source under the MIT license.
Is Codebase Refactoring maintained?
The repository's most recent commit was on Oct 25, 2026. Its latest release is v5.4.2. appsgit only lists skills from repositories with a commit in the last six months.