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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: 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 handler runs in the receive loop's context instead, breaking trace propagation. This PR propagates contextvars.Context through anyio memory streams without adding any field to SessionMessage, addressing Kludex's review comment on the previous approach (#1996). How it works ContextSendStream / ContextReceiveStream wrappers capture the sender's context at send() time and expose it via last_context on the receive side BaseSession._receive_loop reads last_context and passes it to RequestResponder, which carries it to the server handler boundary lowlevel/server.py uses context.run(tg.start_soon, handler) so handler tasks inherit the sender's context Client transport post_writer functions restore sender context the same way Protocol-based ReadStream / WriteStream replace concrete MemoryObjectSendStream / MemoryObjectReceiveStream types, so both raw and context-aware streams are accepted create_context_streams[T](n) mirrors anyio's bracket syntax with proper generic propagation Additional changes Switch coverage config from exclude_lines to exclude_also to inherit coverage.py's built-in defaults (which handle ... stubs and pragma: no cover) Fixes #1969 Part of #421 Test plan test_context_propagation: sets a contextvar via a context manager (which resets on exit), calls a tool, verifies the server handler sees the sender's value. Fails on main, passes with this PR. All existing tests pass pyright passes with 0 errors

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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6fef500 Propagate contextvars.Context through anyio streams without modifying… Kludex Mar 16, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/6fef500116b353a8c00a26bbbe24bca378bb6a8c
2513380 Add pragma: no cover to Protocol stubs and unused clone() methods Kludex Mar 16, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/2513380f03bba03cb2e5d5fa5c82a68dcbf9965b
1b34f2e Use pragma: no branch for Protocol stubs to satisfy strict-no-cover Kludex Mar 16, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/1b34f2eb21c5382f83b712dce2952fcc15dff6c0
32565b3 Address review feedback: ExceptionGroup bug, reverse dependency, type… Kludex Mar 16, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/32565b3ebe3b0aba566a7150f637b0b3f86af7ac
b321dd2 Restore correct context propagation for async handlers Kludex Mar 16, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/b321dd206bb318e4ccec416fd26f07d773b76efb
ef7e4b4 Remove unnecessary pragmas and fix generic type propagation Kludex Mar 31, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/ef7e4b4fa1b3a0a199153c4d9273accf9f739624
ab4f1c5 Move sender context lookup into _handle_session_message Kludex Mar 31, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/ab4f1c54fd68465a0e74f6a105bbcbba073ab703
dc8d842 Merge remote-tracking branch 'origin/main' into try-no-context-field Kludex Mar 31, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/dc8d842d1b0f0b65822eb8791b2d9b9cbda01c25
1517b79 Add pragma: no branch to Protocol stubs Kludex Mar 31, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/1517b79bc9ae96d36ed6fbf7852741a8f639dd29
379fe57 Use exclude_also instead of exclude_lines for coverage config Kludex Mar 31, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/379fe57261edddf26e37abe4fb27745d3c435cf6
8dd89fd Use exclude_also instead of exclude_lines for coverage config Kludex Mar 31, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/8dd89fd19a0d6056e2160f4e43356b6fe76ebc51
aec97fb Merge branch 'try-no-context-field' of github.com:modelcontextprotoco… Kludex Mar 31, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/aec97fb81e591c23e84f734f10b2627cd9a3169f
df6df0e Remove pragma: no branch from Protocol stubs Kludex Mar 31, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/df6df0ec0525023acc5b77d6325f97f87e23513f
da049fb Add test for contextvars propagation from client to server handler Kludex Mar 31, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/da049fb42ffea534464a3c7861cb53b6661c6f1f
dee1291 Rewrite context propagation test to actually verify the feature Kludex Mar 31, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/dee12910b9e0c061501d52a232d1d35925b947a9
6956854 Add assertion message to context propagation test Kludex Mar 31, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2298/commits/69568544a00a10347bd22a51ff91abb436434a6c
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