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.
Install
npx skills add vercel-labs/agent-browser --skill derive-clientnpx skills add vercel-labs/agent-browser --skill derive-client -a claude-code -gnpx skills add vercel-labs/agent-browser --skill derive-client -a codex -ggemini skills install https://github.com/vercel-labs/agent-browser.git --path skill-data/derive-clientgh skill install vercel-labs/agent-browser derive-clientgit clone --depth 1 https://github.com/vercel-labs/agent-browser /tmp/vercel-labs__agent-browser
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/vercel-labs__agent-browser/skill-data/derive-client ~/.claude/skills/derive-client # Claude Code
cp -R /tmp/vercel-labs__agent-browser/skill-data/derive-client ~/.agents/skills/derive-client # Codex, Cursor, Gemini CLI, Copilot, OpenCode