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CDP Bridge MCP —— a bridge service that connects MCP clients to real browser sessions
lala Par · 2026-05-10 · via DEV Community

CDP Bridge MCP is a bridge service that connects MCP clients to real browser sessions. Through its companion Chromium extension, model clients can access browser pages, list tabs, scan page content, execute JavaScript, capture screenshots, navigate pages, and read cookies.

Demo Videos

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Introduction

CDP Bridge MCP is designed for scenarios where large language models need to work with a real browser. Unlike stateless HTTP fetching, it connects to browser pages that are already open and already logged in, so it can reuse the browser's login state, cookies, page state, and rendered frontend result.

Repository: https://github.com/Unagi-cq/cdp-bridge-mcp

This project is written and distributed in Python.

Why CDP Bridge MCP?

Why use CDP Bridge MCP instead of Playwright MCP or Chrome DevTools MCP?

Playwright MCP and Chrome DevTools MCP are both powerful, but they are more oriented toward workflows such as automated testing, debugging protocols, or newly launched browser instances. CDP Bridge MCP has a different goal: it focuses on letting an LLM directly work with the real browser session you are already using.

  • Reuse real login state: CDP Bridge MCP connects to browser tabs that are already open and logged in. It can directly use existing cookies, login state, page context, and rendered frontend output. For many account-based websites, there is no need to log in again or manually transfer cookies.
  • Better for everyday browser collaboration: Playwright is a strong fit for repeatable and scriptable automation workflows. CDP Bridge MCP is better suited for interactive tasks on the user's current page, such as reading, analyzing, checking before clicking, executing scripts, and taking screenshots.
  • Page content is optimized for LLMs: browser_scan simplifies page HTML by filtering scripts, styles, and invisible elements while keeping useful text, controls, and structure, reducing token waste.
  • Lightweight startup flow: Once published to PyPI, the server can be started with uvx cdp-bridge. The browser side only needs the extension to be loaded. There is no need to write Playwright scripts or configure debug parameters for each browser instance.

If your goal is to let a model control a dedicated automation browser, Playwright MCP is a good fit. If your goal is to debug Chrome or work closely with the DevTools protocol, Chrome DevTools MCP is a good fit. If your goal is to let a model read and operate on the real browser page you are currently using, CDP Bridge MCP is closer to that scenario.

Available Tools

The MCP server currently exposes these tools:

Tool Description
browser_get_tabs Get the list of connected browser tabs
browser_scan Scan the active page as simplified HTML or plain text
browser_execute_js Execute JavaScript in the active tab
browser_switch_tab Switch the active MCP tab without changing the user's visible Chrome tab
browser_batch Run extension/CDP commands in a single request for complex flows
browser_wait Poll a JavaScript condition until it returns a truthy value or times out
browser_navigate Navigate the active tab to a URL
browser_screenshot Capture a page screenshot
browser_cookies Read cookies

Usage

Installation Steps

  1. Load the browser extension folder src/cdp_bridge/tmwd_cdp_bridge into Chrome or another Chromium-based browser.
  2. Configure CDP Bridge MCP in your MCP client.

After that, the MCP server can be used normally. The detailed steps are listed below.

Load the Browser Extension

In Chrome or another Chromium-based browser:

  1. Open chrome://extensions/.
  2. Enable "Developer mode".
  3. Click "Load unpacked".
  4. Select the src/cdp_bridge/tmwd_cdp_bridge folder.

By default, the extension connects to the local service at 127.0.0.1:18765.

Configure MCP

First, install uv on your computer.

uvx was officially introduced in uv 0.2.0. If your uv version is lower than 0.2.0, the uvx command may not be available. In older versions, similar functionality can be used through uv tool run, which is also the underlying behavior of uvx.

Script Test

uvx cdp-bridge # uv >= 0.2.0
uv tool run # uv < 0.2.0

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Standard Configuration

You can configure it in an MCP client like this:

{
  "mcpServers": {
    "cdp-bridge": {
      "command": "uvx",
      "args": ["cdp-bridge"]
    }
  }
}

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Claude Code

claude mcp add cdp-bridge uvx cdp-bridge

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Codex

codex mcp add cdp-bridge uvx cdp-bridge

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opencode

Configure it in ~/.config/opencode/opencode.json:

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "cdp-bridge": {
      "type": "local",
      "command": [
        "uvx",
        "cdp-bridge"
      ],
      "enabled": true
    }
  }
}

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OpenClaw

You can write the MCP configuration with the OpenClaw CLI:

openclaw mcp set cdp-bridge '{"command":"uvx","args":["cdp-bridge@latest"]}'

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Equivalent configuration shape:

{
  "mcp": {
    "servers": {
      "cdp-bridge": {
        "command": "uvx",
        "args": ["cdp-bridge@latest"]
      }
    }
  }
}

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Notes

  • This project requires Python 3.10 or newer.
  • The browser extension and MCP server must run at the same time. Otherwise, the tools will report that no browser tabs are connected.
  • Browser automation runs in your real browser session, so only connect MCP clients that you trust.