Derive Client
Derive Client is an agent skill (a SKILL.md file) from vercel-labs/agent-browser. Reverse-engineer a website's internal API by recording browser traffic into a HAR file, then generate a standalone client or CLI that calls the endpoints directly, with no browser… It works with Claude Code and Cursor and has 43,583 GitHub stars across a repository of 7 listed skills.
github.com/vercel-labs/agent-browser/skill-data/derive-client (opens in a new tab)
- Official
- Multi-skill repo
- Plugin marketplace
- Coding
- Actively maintained
Add this skill
Claude
This repository is a Claude Code plugin marketplace. In Claude Code:
/plugin marketplace add vercel-labs/agent-browser
/plugin install agent-browser@agent-browserIn the Claude apps, zip the derive-client 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/vercel-labs/agent-browser.git
cp -r agent-browser/skill-data/derive-client .agents/skills/derive-client # 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/vercel-labs/agent-browser.git
cp -r agent-browser/skill-data/derive-client .cursor/skills/derive-client # project; ~/.cursor/skills for all projectsSource (checked Oct 7, 2026): code.claude.com/docs/en/skills (opens in a new tab), code.claude.com/docs/en/plugin-marketplaces (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
Reverse-engineer a website's internal API by recording browser traffic into a HAR file, then generate a standalone client or CLI that calls the endpoints directly, with no browser needed after the first recording. Use when asked to "derive a client", "build a CLI for ", "reverse engineer this site's API", "record network requests", "turn this site into an API", or when the same site will be automated repeatedly and direct HTTP calls would beat driving the browser every time.
When it triggers
- Use when asked to "derive a client", "build a CLI for ", "reverse engineer this site's API", "record network requests", "turn this site into an API", or when the same site will be automated repeatedly and direct HTTP calls would beat drivin
- "derive a client"
- "build a CLI for"
- "reverse engineer this site's API"
- "record network requests"
- "turn this site into an API"
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What is the Derive Client skill?
Derive Client is an agent skill (a SKILL.md file) from vercel-labs/agent-browser. Reverse-engineer a website's internal API by recording browser traffic into a HAR file, then generate a standalone client or CLI that calls the endpoints directly, with no browser… It works with Claude Code and Cursor and has 43,583 GitHub stars across a repository of 7 listed skills. Its SKILL.md lives at github.com/vercel-labs/agent-browser/skill-data/derive-client.
How do I install the Derive Client skill?
In Claude Code, run /plugin marketplace add vercel-labs/agent-browser and then /plugin install agent-browser@agent-browser. For Codex or Cursor, copy the derive-client folder into .agents/skills/ or .cursor/skills/.
Is the Derive Client skill free?
Yes. The repository is open source under the Apache-2.0 license.
Is Derive Client maintained?
The repository's most recent commit was on Oct 6, 2026. Its latest release is v0.38.2. appsgit only lists skills from repositories with a commit in the last six months.