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API Breaking Change Detector

API Breaking Change Detector is an agent skill (a SKILL.md file) from github/awesome-copilot. Cross-references C# Web API controllers/DTOs against their TypeScript/JavaScript consumers (React, Angular, Vue, Svelte, Node.js, or hand-written/auto-generated HTTP clients like Fetch, Axios. It works with Claude Code and GitHub Copilot and has 40,416 GitHub stars across a repository of 7 listed skills.

github.com/github/awesome-copilot/skills/api-breaking-change-detector (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/github/awesome-copilot.git
cp -r awesome-copilot/skills/api-breaking-change-detector ~/.claude/skills/api-breaking-change-detector   # personal, or .claude/skills in a project

In the Claude apps, zip the api-breaking-change-detector 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/github/awesome-copilot.git
cp -r awesome-copilot/skills/api-breaking-change-detector .agents/skills/api-breaking-change-detector   # 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/github/awesome-copilot.git
cp -r awesome-copilot/skills/api-breaking-change-detector .cursor/skills/api-breaking-change-detector   # 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

Cross-references C# Web API controllers/DTOs against their TypeScript/JavaScript consumers (React, Angular, Vue, Svelte, Node.js, or hand-written/auto-generated HTTP clients like Fetch, Axios, NSwag) to catch contract drift in both directions: backend changes that break client applications (renamed/removed JSON keys, new required parameters, status code shifts) and frontend code sending fields the backend no longer reads. Works directly against source code, not exported OpenAPI spec files.

When it triggers

  • Use when the user asks to check for breaking API changes, verify frontend/backend contract sync, or audit a DTO/controller change against its TypeScript/JS consumers before merging.

More skills in github/awesome-copilot

7 skills are listed from this repository.

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FAQ

API Breaking Change Detector FAQ

Still curious? Email info@appsgit.com.

How do I install the API Breaking Change Detector skill?

Copy the api-breaking-change-detector 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 API Breaking Change Detector skill free?

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

Is API Breaking Change Detector maintained?

The repository's most recent commit was on Oct 26, 2026. appsgit only lists skills from repositories with a commit in the last six months.