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Title: Propagate contextvars.Context through anyio streams without modifying SessionMessage by Kludex · Pull Request #2298 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: Propagate contextvars.Context through anyio streams without modifying SessionMessage by Kludex · Pull Request #2298 · modelcontextprotocol/python-sdk

X Title: Propagate contextvars.Context through anyio streams without modifying SessionMessage by Kludex · Pull Request #2298 · modelcontextprotocol/python-sdk

Description: The official Python SDK for Model Context Protocol servers and clients - Propagate contextvars.Context through anyio streams without modifying SessionMessage by Kludex · Pull Request #2298 · modelcontextprotocol/python-sdk

Open Graph Description: Summary MCP server handlers currently lose the sender's contextvars.Context. When a client sets context variables (e.g. OpenTelemetry trace/span IDs) before sending a request, the server handle...

X Description: Summary MCP server handlers currently lose the sender's contextvars.Context. When a client sets context variables (e.g. OpenTelemetry trace/span IDs) before sending a request, the server ha...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2298

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Add pragma: no cover to Protocol stubs and unused clone() methodshttps://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/2513380f03bba03cb2e5d5fa5c82a68dcbf9965b
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Use pragma: no branch for Protocol stubs to satisfy strict-no-coverhttps://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/1b34f2eb21c5382f83b712dce2952fcc15dff6c0
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Address review feedback: ExceptionGroup bug, reverse dependency, type…https://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/32565b3ebe3b0aba566a7150f637b0b3f86af7ac
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Propagate contextvars through anyio streams #1996 https://github.com/modelcontextprotocol/python-sdk/pull/1996
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Remove unnecessary pragmas and fix generic type propagationhttps://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/ef7e4b4fa1b3a0a199153c4d9273accf9f739624
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Move sender context lookup into _handle_session_messagehttps://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/ab4f1c54fd68465a0e74f6a105bbcbba073ab703
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Merge remote-tracking branch 'origin/main' into try-no-context-fieldhttps://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/dc8d842d1b0f0b65822eb8791b2d9b9cbda01c25
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Add pragma: no branch to Protocol stubshttps://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/1517b79bc9ae96d36ed6fbf7852741a8f639dd29
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Use exclude_also instead of exclude_lines for coverage confighttps://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/379fe57261edddf26e37abe4fb27745d3c435cf6
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Use exclude_also instead of exclude_lines for coverage confighttps://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/8dd89fd19a0d6056e2160f4e43356b6fe76ebc51
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Merge branch 'try-no-context-field' of github.com:modelcontextprotoco…https://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/aec97fb81e591c23e84f734f10b2627cd9a3169f
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Remove pragma: no branch from Protocol stubshttps://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/df6df0ec0525023acc5b77d6325f97f87e23513f
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March 31, 2026 11:44https://github.com/modelcontextprotocol/python-sdk/pull/2298#commits-pushed-da049fb
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Add test for contextvars propagation from client to server handlerhttps://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/da049fb42ffea534464a3c7861cb53b6661c6f1f
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Rewrite context propagation test to actually verify the featurehttps://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/dee12910b9e0c061501d52a232d1d35925b947a9
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Add assertion message to context propagation testhttps://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/69568544a00a10347bd22a51ff91abb436434a6c
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Add basic OpenTelemetry tracing for client and server requests #2381 https://github.com/modelcontextprotocol/python-sdk/pull/2381
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Apr 15, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2298#ref-issue-4105947696
Python: [Bug]: Unable to pass AgentContext to MCPStreamableHTTPTool microsoft/agent-framework#4808 https://github.com/microsoft/agent-framework/issues/4808
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May 13, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2298#ref-issue-4439965033
Python: [Bug]: MCPStreamableHTTPTool re-injects header_provider headers on cross-origin redirects (latent until #4808 / mcp-sdk#2298 ship) microsoft/agent-framework#5820 https://github.com/microsoft/agent-framework/issues/5820
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Jul 10, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2298#ref-pullrequest-4858859829
Document per-user MCP authentication: build MCPToolset per run via @agent.toolset pydantic/pydantic-ai#6425 https://github.com/pydantic/pydantic-ai/pull/6425
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Propagate ContextVars to Transport Layer in MCP Clients https://github.com/modelcontextprotocol/python-sdk/issues/1969
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