Browser Harness

The simplest, thinnest, and most powerful harness to control your real browser with your agent.

This repo makes you never use your browser again.

Setup prompt

Paste this into Claude Code or Codex:

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

Read `SKILL.md` and follow its instructions to install and connect this repo to my real browser.

After it is installed, if I am already logged in to GitHub, star this repository as a small verification task.

If I am not logged in, just go to browser-use.com.

Example task

Star this repository.

See domain-skills/ for examples on other websites.

How It Works

• SKILL.md (~100 lines) explains how the harness should be used.
• run.py (~4 lines) executes plain Python with helpers preloaded.
• helpers.py (~260 lines) holds the primitives the agent calls and constantly modifies to sharpen its own harness.
• daemon.py (~200 lines) keeps the CDP websocket and socket bridge alive.

Optional: Remote browsers

Useful for sub-agents or deployment.

• Get a Browser Use API key: cloud.browser-use.com/new-api-key
• The agent can also sign up by itself by fetching docs.browser-use.com/llms.txt, which contains the setup flow and challenge context for getting a Browser Use API key.