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typescript-sdk/.changeset/streamable-http-sse-keepalive.md

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@modelcontextprotocol/sdk
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StreamableHTTPServerTransport and WebStandardStreamableHTTPServerTransport now write SSE keep-alive comment frames (: keepalive) to open SSE streams so idle connections (e.g. the standalone GET stream, or a POST stream during a long-running tool call) are not killed by intermediaries or server idle timeouts. Configurable via the new keepAliveMs option (default 15000; set 0 to disable).