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Model Context Protocol (MCP)
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When does ...
When does MCP use the stdio transport versus the HTTP + SSE transport?
stdio is used when the server runs as a local process on the same machine; HTTP + SSE is used when the server is accessed over a network
stdio is used for small payloads under 1 MB; HTTP + SSE is used for larger streaming responses
stdio is deprecated and only kept for backwards compatibility; HTTP + SSE is the only recommended transport
stdio is for read-only Resource requests; HTTP + SSE is reserved for Tool calls that have side effects
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