See what an MCP server actually says.

Point it at any streamable HTTP or SSE endpoint. Read the tools, run them against real arguments, and watch every JSON-RPC frame go past, handshake included.

No install

A URL is the whole setup. Nothing to npx, nothing to configure.

Real frames

The transcript is the wire, not a summary of it.

Honest timing

Handshake and call are measured separately.