Agent Bridge: Open-Source MCP Server Drives Your Logged-in Chrome, Cutting Token Use 57% vs Claude in Chrome
falconsw · reddit · 2026-11-11
Developer falconsw released Agent Bridge, an open-source MCP server that lets Claude Code, Cursor, or Codex drive your real, logged-in Chrome — solving the pain of Playwright/DevTools MCP launching fresh sessionless browsers that struggle with login-gated pages like YouTube Studio or Search Console.
How it works: agent ↔ stdio ↔ agent-bridge ↔ WebSocket (127.0.0.1, token) ↔ Chrome extension (chrome.debugger) ↔ page. No remote debugging port needed, nothing leaves the machine, and the agent works in its own yellow "Agent" tab group. Full toolset: navigate, click, fill, screenshot, eval, network, and more.
Token efficiency is the focus: navigate returns compact snapshots with refs (button "Save" r12), actions return only changes, and fill completes a form in one call. Median benchmark vs Claude in Chrome (3 tasks × 3 runs, Sonnet): 146.5k vs 343.2k tokens, 6 vs 22 tool calls, 40s vs 78s, both 9/9 correct.
Caveats: install the extension unpacked from the release zip; since it uses your real sessions, watch for prompt injection on untrusted pages. Install: claude mcp add --scope user agent-bridge -- npx -y chrome-agent-bridge. MIT licensed.
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