MCP Interceptor

Debug MCP requests in real-time. Create a proxy URL, point your Claude (or any MCP client) at it, and watch the traffic flow.

Home	Monitor

Try it out here: mcp-interceptor.appsinprogress.com

What it does

• Creates unique proxy URLs for your MCP servers
• Intercepts and logs all requests/responses
• Real-time monitoring via WebSocket connection
• Built on Cloudflare Workers + Durable Objects

Quick start

# Backend (API + proxy)
cd backend
npm install
npm run dev

# Frontend (monitoring UI)
cd frontend  
npm install
npm run dev

How to use

1. Create interceptor: Enter your MCP server URL at /
2. Get proxy URL: Use the generated proxy URL in your MCP client
3. Monitor traffic: View real-time requests at /monitor/{id}

Demo

Try it with the test MCP server: https://random-weather-mcp.tgauvin.workers.dev/mcp

Deploy

# Deploy both frontend + backend to Cloudflare
cd backend && npm run deploy
cd frontend && npm run deploy

Built with Hono, ReactRouter, and WebSockets. Only supports HTTP transport (MCP 2025-03-26+).