MCP Server Demo

Watch the Model Context Protocol in action. Every tool call, JSON-RPC message, and protocol event is shown live in the trace panel.

Enter to send · Shift+Enter for newline

Protocol Trace

No events yet

Send a message to watch the MCP protocol in action. Every JSON-RPC message will appear here in real time.

You'll see:

initializeProtocol handshake

tools/listTool discovery

tools/callTool execution

tool resultRaw tool output

token usageCost metrics

JSON-RPC 2.0 over HTTP