Mark SSE transport as deprecated in favor of Streamable HTTP#2310
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alexchenai wants to merge 1 commit intomodelcontextprotocol:mainfrom
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Mark SSE transport as deprecated in favor of Streamable HTTP#2310alexchenai wants to merge 1 commit intomodelcontextprotocol:mainfrom
alexchenai wants to merge 1 commit intomodelcontextprotocol:mainfrom
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Add DeprecationWarning and docstring deprecation notices to: - sse_client() in client/sse.py - SseServerTransport in server/sse.py - MCPServer.run(transport="sse"), run_sse_async(), and sse_app() The HTTP+SSE transport was replaced by Streamable HTTP in protocol revision 2025-03-26. The TypeScript SDK already marks SSEClientTransport as deprecated; this brings the Python SDK into alignment. Closes modelcontextprotocol#2278 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
warnings.warn(..., DeprecationWarning, stacklevel=2)runtime warnings and.. deprecated::docstring markers to all SSE transport entry pointsSSEClientTransportas@deprecatedFiles changed
src/mcp/client/sse.py—sse_client(): deprecation warning + docstringsrc/mcp/server/sse.py—SseServerTransportclass: deprecation warning in__init__, module docstring, and class docstringsrc/mcp/server/mcpserver/server.py—run(transport="sse"),run_sse_async(), andsse_app(): deprecation warnings + docstringsContext
The HTTP+SSE transport was replaced by Streamable HTTP in protocol revision 2025-03-26. The spec now refers to it as the "deprecated HTTP+SSE transport".
Closes #2278
Test plan
DeprecationWarningis emitted when callingsse_client()DeprecationWarningis emitted when instantiatingSseServerTransportDeprecationWarningis emitted when callingMCPServer.run(transport="sse")DeprecationWarningis emitted when callingrun_sse_async()andsse_app()🤖 Generated with Claude Code