MCP over Websockets on Cloudflare Durable Objects

This is a proof of concept Model Context Protocol (MCP) server running on a Cloudflare Durable Object.

The agent connects to the DO Server via a proxy using the JSON stdio transport, which is then forwarded to the DO Server via Websockets.

Agent <-stdio-> Proxy <-ws-> DO Server

Usage

• Deploy to CloudFlare with npm run deploy.
• Run the proxy server with npx tsx src/client.ts wss://my-durable-object.foo.workers.dev.
• Use mcp inspector to test the server npx -y @modelcontextprotocol/inspector npx -y tsx src/client.ts wss://...