Browser Harness ♞

Connect an LLM directly to your real browser through one editable CDP websocket. The agent writes missing helpers as it works, so the harness improves with every task.

Try browser-harness in Browser Use Cloud or paste the setup prompt into your coding agent.

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

You will never use the browser again.

See it work

Task: "Open my X profile, find my latest 20 video posts, and download them."

Setup prompt

Paste into Claude Code or Codex:

Install or upgrade browser-harness to the latest stable version with uv using Python 3.12, register the skill from `browser-harness skill`, and connect it to my browser. Ask whether I want local browser recordings enabled; default to no and preserve my existing preference on upgrades. Follow https://github.com/browser-use/browser-harness/blob/main/install.md if setup or connection fails.

The agent will open chrome://inspect/#remote-debugging. On first setup, tick the checkbox so the agent can connect to your browser:

How it works

install.md connects the agent to your browser.
SKILL.md teaches it the browser workflow.
src/browser_harness/ stays protected while the agent writes reusable helpers in its local workspace.

Scale with Browser Use Cloud

Use your local browser for logged-in, personal work. When you want many browsers in parallel—with live previews, proxies, stealth, CAPTCHA solving, and more—scale with Browser Use Cloud.

MCP server

browser-harness-mcp exposes the browser control helpers as MCP tools over stdio, so any MCP client (Claude Code, Devin, Cursor, etc.) can drive the browser without writing a second CDP layer. See docs/MCP.md for setup and client configuration.

Contributing

Bug fixes, documentation improvements, and agent-generated domain skills are welcome. See CONTRIBUTING.md.

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

Download files

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Source Distribution

browser_harness-0.1.13.tar.gz (114.9 kB view details)

Uploaded Sep 4, 2026 Source

Built Distribution

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browser_harness-0.1.13-py3-none-any.whl (121.1 kB view details)

Uploaded Sep 4, 2026 Python 3

File details

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File metadata

Download URL: browser_harness-0.1.13.tar.gz
Upload date: Sep 4, 2026
Size: 114.9 kB
Tags: Source
Uploaded using Trusted Publishing? Yes
Uploaded via: twine/7.0.0 CPython/3.13.14

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Provenance

The following attestation bundles were made for browser_harness-0.1.13.tar.gz:

Publisher: release.yml on browser-use/browser-harness

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Statement:
- Statement type: https://in-toto.io/Statement/v1
- Predicate type: https://docs.pypi.org/attestations/publish/v1
- Subject name: browser_harness-0.1.13.tar.gz
- Subject digest: 284dc547a042c309feafd9a9f4a74b2a8651b7963ea3ac6cb2f2d64889f6a8f3
- Sigstore transparency entry: 2706292556
- Sigstore integration time: Sep 4, 2026
Source repository:
- Permalink: browser-use/browser-harness@c24e5072ee66f8499bacd663f4f4bcb089bc4492
- Branch / Tag: refs/tags/v0.1.13
- Owner: https://github.com/browser-use
- Access: public
Publication detail:
- Token Issuer: https://token.actions.githubusercontent.com
- Runner Environment: github-hosted
- Publication workflow: release.yml@c24e5072ee66f8499bacd663f4f4bcb089bc4492
- Trigger Event: release