Plain-AyI
← All projects
Add-ons for AI coding tools

Browser Harness

Lets AI coding assistants use your own Chrome browser, already logged in, to do web tasks for you.

What it does

Browser Harness connects AI assistants such as Claude Code, Codex or Cursor to your real Chrome browser. The AI can open pages, click, type, read and download, using the accounts you're already logged in to.

You set it up by pasting one prompt into your assistant, then ticking a box in Chrome to allow the connection. When the AI needs something it can't do yet, it writes a small reusable helper for itself.

Because the AI acts as you in your browser, it's wise to watch what it does. Its makers also compare it with other browser tools and say when those may fit better.

Who it's for

People already using an AI coding assistant who want it to handle tasks on websites.

Can I use it without coding?

With some setup. Needs an AI coding tool; setup is done by pasting a prompt and allowing access in Chrome. New to this? Start here.

Can I run it?

Cost
Free, but needs an AI accountThe software is free, but it uses an online AI service (like OpenAI or Anthropic), which usually charges for use.
Computer
An ordinary computer is fine
Privacy
Sends what you give it to an online service
API key
Not needed

Try it

  1. Paste the setup prompt from the README into Claude Code or Codex.
  2. When Chrome opens its remote debugging page, tick the checkbox so the agent can connect.
  3. Then ask your coding agent to do a web task for you.

Using Claude Code, Cursor or another AI coding assistant? Paste the prompt and it will walk you through the setup.New to this?

Before you install

  • Only download from the official GitHub page. Copies with similar names exist for many popular projects.
  • License (MIT): Very permissive: free to use, change and share, including for business.
  • What you type or upload is sent to an online service. Avoid sharing private or sensitive information.
  • More on staying safe

Where people are talking about it