Debug MCP Like Network Tab: Seeing Every Tool Call in Real Time

You triggered a tool call from Cursor, something went wrong, and the only feedback was silence—or a vague error. The server is running, the tool is registered, but you have no idea what actually crossed the wire. This article walks through getting a browser-based trace of every JSON-RPC message without touching your server code. Disclosure I maintain mcpkit . This article explains how I use it to inspect Model Context Protocol traffic—I am biased, but the problem is real whether you use this too