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What it does
Full docs index: https://docs.steel.dev/llms.txt Steel Documentation Steel is the open-source browser API for AI agents — managed cloud browsers with stealth, residential proxies, CAPTCHA solving, persistent profiles, session replays, and agent observability. Use Steel to launch cloud browsers, scrape content, and automate web tasks. Quick Reference - Install: npm install steel-sdk (Node.js) or pip install steel-sdk (Python) - CLI: curl -sSf https://setup.steel.dev | sh - Auth header: steel-api-key: <your-key - Auth env var: STEEL API KEY - API base URL: https://api.steel.dev - WebSocket: wss://connect.steel.dev?apiKey=<key &sessionId=<id - API reference: https://steel.apidocumentation.com/api-reference - Brand design language (DESIGN.md): https://docs.steel.dev/DESIGN.md Agent Instructions - For the simplest one-liner scrape, use the CLI: - For simple scraping without a browser session, use the REST scrape endpoint: - For browser automation, connect Puppeteer or Playwright via WebSocket: - Python SDK: - client.scrape() returns a ScrapeResponse with: - result.content.html — full HTML string - result.content.markdown — markdown version - result.content.cleaned html — cleaned HTML - result.content.readability — readability text - result.metadata.status code — HTTP status (int) - result.metadata.title — page title - result.links — list of extracted links - Always release sessions when done: client.sessions.release(sessionId) - Do NOT use session.websocketUrl directly — construct the WSS URL as shown above - The Node SDK constructor param is steelAPIKey (not apiKey) - The Python SDK constructor param is steel api key (not api key) - The Python package installs as pip install steel-sdk but imports as from steel import Steel - sessions.create() accepts an optional sessionId (Node) / session id (Python) UUID when you need the ID before the session exists; omit it and Steel generates one - The Python sessions.create() session timeout param is api timeout (not timeout, which is the HTTP request timeout) - Any docs page is available as markdown by appending .md to its URL, for example https://docs.steel.dev/overview/steel-cli.md; AI user agents (Claude, Cursor, GPT) receive markdown automatically at the canonical URL - /llms-full.txt concatenates every page into one file (large, roughly 230k tokens); prefer fetching the individual .md pages you need over reading the whole bundle
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