Connect an agent

The endpoint

https://tabtunnel.dev/v1/mcp

Two ways to sign in

The app decides which one you use.

The app signs you in

Give it the address above and nothing else. It opens a TabTunnel page, you approve, and it is connected — nothing to copy. It then shows up in your Tokens list, where you can stop it at any time. Claude.ai, Claude Desktop and ChatGPT work this way; see their page. Use this whenever the app offers it.

You paste a token

Create one on the dashboard's Tokens page and put it in an Authorization header. Claude Code, Cursor, Windsurf, Cline and your own code work this way.

• It works in the organization you created it in, and reaches only the browsers you can already use there.
• Only you can see or stop your tokens — not even an owner of your organization can.
• You see it once. If you lose it, stop it and create another.

Pick a client

• Claude Code — one command.
• Claude.ai, Claude Desktop, ChatGPT — paste a URL, approve in the browser.
• Cursor, Windsurf, Cline — one block of mcp.json.
• Your own code — plain HTTP requests, no SDK needed.

Then what

Ask the agent to list your browsers. Once yours comes back, the tool reference shows what it can do — including why it cannot see the tab you are looking at.