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The HTTP+SSE transport was superseded by Streamable HTTP in the 2025-03-26 spec revision and is formally deprecated under SEP-2596. Mark every public entry point with typing_extensions.deprecated so type checkers flag it and a runtime MCPDeprecationWarning fires: sse_client, SseServerParameters, SseServerTransport, MCPServer.sse_app / run_sse_async, and the run(transport="sse") overload. Nested constructions suppress the inner warning so callers see exactly one. Also: mcp run --transport help text drops sse, python -m mcp.client connects with Streamable HTTP, and the url_elicitation client snippet moves to Streamable HTTP. Docs and migration guide updated. No-Verification-Needed: user requested immediate push, verification explicitly waived