Connect an LLM directly to your real browser with a thin, editable CDP harness. For browser tasks where you need complete freedom.

One websocket to Chrome, nothing between. The agent writes what's missing during execution. The harness improves itself every run.

  ● agent: wants to upload a file
  │
  ● agent-workspace/agent_helpers.js → helper missing
  │
  ● agent writes it                         agent_helpers.js
  │                                                       + custom helper
  ✓ file uploaded

You will never use the browser again.

Paste into Claude Code or Codex:

Set up https://github.com/browser-use/browser-harness for me.

Read `install.md` and follow the steps to install browser-harness and connect it to my browser.

The agent will open chrome://inspect/#remote-debugging. Tick the checkbox so the agent can connect to your browser:

Click Allow when the per-attach popup appears (Chrome 144+):

See agent-workspace/domain-skills/ for example tasks.

Stealth, sub-agents, or headless deployment.
Browser Use Cloud free tier: 3 concurrent browsers, proxies, captcha solving, and more. No card required.

• Grab a key at cloud.browser-use.com/new-api-key
• Or let the agent sign up itself via docs.browser-use.com/llms.txt (setup flow + challenge context included).

• src/browser_harness/ — core daemon and connection management
• src/browser_use/ — hard-ported browser-use framework (Agent, DOM, Controller)
• helpers.js — Puppeteer-powered browser control primitives
• agent-workspace/agent_helpers.js — helper code the agent edits
• agent-workspace/domain-skills/ — reusable site-specific skills the agent edits

• Puppeteer Backend: Reliable interaction via the world's most popular automation library.
• Autonomous Agent: Integrated Agent loop that observes, thinks, and acts using vision and DOM data.
• Smart DOM Extraction: Extracts only interactive and visible elements to minimize LLM context.
• Action Controller: High-level actions like search, scroll, and upload_file.
• Multi-Tab Support: Manage and switch between multiple browser sessions seamlessly.

The Bitter Lesson of Agent Harnesses · Web Agents That Actually Learn