bu

LLM-first browser control via CDP. No CLI, no wrappers, just Python and CDP.

Setup

1. Install deps (uses uv):

   uv sync
   

2. Enable Chrome remote debugging: open chrome://inspect/#remote-debugging, check the box. Chrome now listens at 127.0.0.1:9222.

3. (Optional) For remote browsers: cp .env.example .env and fill in BROWSER_USE_API_KEY.

4. Start the daemon:

   uv run daemon.py &
   

Usage

uv run run.py <<'PY'
goto("https://example.com")
wait(1)
screenshot("/tmp/shot.png")
print(page_info())
PY

Parallel agents / remote browsers: BU_NAME=<n> uv run run.py. See SKILL.md.

Read SKILL.md for both usage and maintenance guidance. Read helpers.py for every function — they're all ~5 lines each and you can edit any of them.

Files

• daemon.py — holds the WebSocket, listens on /tmp/bu-<name>.sock
• helpers.py — ~250 lines of transparent helpers
• run.py — 3 lines: from helpers import *; exec(stdin)
• SKILL.md — usage guidance, design constraints, and extension gotchas

Stop

uv run python -c "from helpers import kill_daemon; kill_daemon()"        # default daemon
uv run python -c "from helpers import kill_daemon; kill_daemon('work')"  # named daemon (also stops remote browser)
# or
pkill -f bu/daemon.py