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Code Migration

Code Migration is an agent skill (a SKILL.md file) from kucherenko/jscpd. Move code from one implementation to another function by function, tests first and code second, and check two implementations of one app for parity, with jscpd --compare as the progress… It works with Claude Code and has 6,450 GitHub stars across a repository of 3 listed skills.

github.com/kucherenko/jscpd/skills/code-migration (opens in a new tab)

Data as of from the GitHub API; description from the skill's SKILL.md. Report an error

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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/code-migration ~/.claude/skills/code-migration   # personal, or .claude/skills in a project

In the Claude apps, zip the code-migration 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/code-migration .agents/skills/code-migration   # repo; ~/.agents/skills for all projects

Standalone 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/code-migration .cursor/skills/code-migration   # project; ~/.cursor/skills for all projects

Source (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

Move code from one implementation to another function by function, tests first and code second, and check two implementations of one app for parity, with jscpd --compare as the progress measure and a coverage map binding each function to its tests. Use when porting a library or app to another language or framework (Java to Kotlin, JavaScript to Rust, a Python library to TypeScript, an iOS app to Android), when asked what is left to port, or when comparing the Android and iOS versions of an…

When it triggers

  • Use when porting a library or app to another language or framework (Java to Kotlin, JavaScript to Rust, a Python library to TypeScript, an iOS app to Android), when asked what is left to port, or when comparing the Android and iOS versions

More skills in kucherenko/jscpd

3 skills are listed from this repository.

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All Coding

FAQ

Code Migration FAQ

Still curious? Email info@appsgit.com.

How do I install the Code Migration skill?

Copy the code-migration 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 Code Migration skill free?

Yes. The repository is open source under the MIT license.

Is Code Migration 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.