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In the Model Context Protocol (MCP) specification, transport channels define how client hosts communicate with tool servers.

Stdio vs SSE Transports

Stdio (Standard Input/Output): Used when the MCP server runs as a local child process on the same machine. Extremely fast, highly secure, zero network overhead.
SSE (Server-Sent Events): Used for remote or multi-tenant MCP servers over HTTP/HTTPS. Supports bi-directional JSON-RPC over web endpoints.

Explore full protocol implementations in our MCP Architecture Guide.

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What is the difference between Stdio and SSE transport in Model Context Protocol?

Stdio vs SSE Transports