mcpsnoop makes MCP tool traffic inspectable

mcpsnoop is an open-source transparent MCP proxy and TUI for inspecting JSON-RPC traffic between AI clients and MCP servers, including calls, capabilities, replay data, and hung requests. Why it matters: MCP integrations often fail at the boundary between the client and server. Seeing the actual frames makes tool-call debugging more concrete than reading application logs alone.

Try this: Put mcpsnoop between one low-risk MCP client and server, run a known tool call, and compare the observed request and response with the expected schema.