MCP server connects AI agents to existing Chrome sessions with cookies and auth

@playwright-repl/mcp is an MCP server that lets AI agents control your real Chrome browser with access to your existing session, including cookies and authentication. Unlike most AI browser tools that launch fresh browsers each time, this connects to your current Chrome instance via a small extension called Dramaturg.

Installation and Usage

Install via npm:

npm install -g @playwright-repl/mcp playwright-repl-mcp

To connect to your existing Chrome:

playwright-repl-mcp # connects to your Chrome via bridge

To launch a fresh browser instead:

playwright-repl-mcp --standalone

Key Features

• Uses your real browser session (not a fresh Chromium instance)
• Provides full Playwright JavaScript capabilities including page.evaluate(), custom locators, and network interception
• Supports expect() assertions for verifying page state
• Works with Claude Desktop, Claude Code, Cursor, or any MCP client
• Agents see pages through accessibility snapshots (same approach as Playwright MCP)
• Part of a larger toolkit that includes a CLI REPL, VS Code extension, and Chrome extension

How It Differs from Playwright MCP

This tool differs from standard Playwright MCP by connecting to your actual Chrome browser session rather than launching fresh instances. This means agents have access to your existing cookies, authentication, and browser state.

Example Use Cases

• Navigate internal admin dashboards while already logged in
• Scrape data from SaaS tools using existing sessions
• Fill out forms across authenticated pages
• Run assertions to verify results

The agent isn't limited to built-in tools and can run any Playwright code. This approach maintains your browser state across agent interactions rather than requiring fresh logins for each task.