MCP Transport

The transport carries JSON-RPC messages between client and server. stdio spawns the server as a child process. Streamable HTTP uses POST for client→server and Server-Sent Events for server→client streaming.

Local only. Client launches server process. No network. Inherits client environment.

Remote. Client POSTs JSON-RPC to server endpoint. Server uses SSE for notifications and streaming responses. Requires TLS and authentication in production.