cctether

Let Claude Code use your browser over your own connection — no third-party relay.

cctether lets Claude Code (or another MCP client) read and operate tabs in your Chrome, through a connection you run yourself. Nothing goes through a relay or a cctether server. The extension connects only to the service you set up. This extension needs a small service, which you run on the computer where Claude Code runs. The extension does nothing until it is paired with that service. WHAT IT CAN DO When your Claude Code asks, cctether can: list, open and close tabs, and navigate read a page as text, and find elements take screenshots click, type, press keys, scroll, hover and choose menu options show console messages and network requests run JavaScript in the page (the same as DevTools' console) list installed extensions and reload one (for extension developers) HOW IT STAYS SAFE Only tabs in the "cctether" tab group can be used. You choose which tabs to share, and you can drag any tab out at any time. A pause button in the popup stops every action at once. Both sides prove they hold the same 256-bit key before anything happens. After that, every message is encrypted with AES-256-GCM, so a proxy in between can not read or change it. Connections to another computer must use wss://. No analytics, no telemetry, no ads. The code is open source (MIT), has no dependencies, is not minified, and has had a security review (see SECURITY.md). HOW TO SET UP On the computer that runs Claude Code, run: npx cctether@latest setup (needs Node.js 22 or newer). Copy the connection code it prints. Open cctether's settings page in Chrome and paste the code. Open a page you want Claude to use and click Share in the cctether popup, or let Claude open its own tabs. While cctether works on a tab, Chrome shows a bar saying "cctether started debugging this browser". Clicking Cancel on it pauses cctether. PRIVACY The developer receives no data. Page content, screenshots and other results go only to the service you pair with, encrypted. Locally the extension stores your connection code, your settings and a short list of recent actions. Privacy policy: https://github.com/guchaorui/cctether/blob/main/PRIVACY.md Warning: web pages can contain hidden text meant to trick an AI. Keep tabs with sensitive accounts (banking, email, admin consoles) out of the group unless you are watching. cctether is an independent project. It is not made by or affiliated with Anthropic. Source code: https://github.com/guchaorui/cctether