Claude in Chrome
Lets Claude read pages in Chrome, then click, type and fill in forms for you
by Anthropic
Browser Harness
by Browser UseConnectorGet organised
Lets your coding agent use your own Chrome, signed in as you, to click, type and download
About Browser Harness
Browser Harness lets coding agents such as Claude Code, Codex or Cursor use the Chrome you already have open, signed in as you. They can open pages, click, type, read and download files. It is open source.
For Claude Code, Codex and Cursor usersPeople with repetitive web chores
Made by Browser Use
Browser Use is a software company that builds browser automation for AI agents, including an open-source browser agent and cloud browsers. Browser Harness is one of its open-source projects.
- Stars
- ★ 19k
- License
- MIT
- Cost
- Free
- Level
- Intermediate
- Runs
- Local
Overview
Browser Harness is an open-source tool from Browser Use that lets Claude Code, Codex or Cursor work in the Chrome browser you already use. You paste one setup prompt into your agent, tick a remote-debugging box in Chrome, and the agent can then open pages, click, type, read and download files with your existing logins. It also ships as an MCP server for other agents. It suits people who want an agent to handle web chores on sites where they are already signed in.
It works in your real Chrome with your own logins, and the agent writes small helpers for new tasks as it goes.
Try these first
Start with the first one: it is a small task you can check easily.
- Open [public page], tell me the page title and take a screenshot.First try · read-only
- List the tabs I have open and the title of each one.read-only
- Go to [site I'm signed in to] and download the last five [invoices or reports] into my Downloads folder.uses your logins
- Fill in the form at [page] with these details: [details]. Stop before you submit it.writes to a site
Example prompts written by Agent Flows Hub.
Capabilities
From the creator's documentation.
| Toolset | What your agent can do | Access |
|---|---|---|
| Navigation and tabs | Open, switch and close tabs, go to pages and wait for them to load | Read |
| Page reading | Read page details and take screenshots | Read |
| Clicks and typing | Click, type, fill fields and press keys on pages where you are signed in | Read + write |
| Files | Upload files to pages and download files to your computer | Read + write |
| Scripts in the page | Run JavaScript and Chrome DevTools commands in the page | Read + write |
| Local recordings | Save screenshots and action traces on your computer, only if you agree at setup | Read |
Good to know
You want a coding agent to finish a web task on a site where you are already signed in. Browser Harness connects the agent to your running Chrome, so it can open pages, click, type and download files as you.
Limits
- Once you allow remote debugging, the agent works in your whole running Chrome, logged in as you, not in a separate profile. Decide which actions need your approval before the first task.
- On macOS, its helper for Chrome's Allow sheet needs Accessibility permission for the app that runs it. Usage telemetry can be turned off with its telemetry command.
Notes by Agent Flows Hub (original project name: browser-harness), written from the creator's documentation, not from running it ourselves. Browser Harness: setup prompt and comparison · Browser Harness: install and connection guide
Stuck setting it up?
Tell us what happened. We take a look first; if it needs paid work, you get an estimate before anything starts.
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