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Title: Sending cancellation notification to server based on client anyio.CancelScope status by davemssavage · Pull Request #628 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: Sending cancellation notification to server based on client anyio.CancelScope status by davemssavage · Pull Request #628 · modelcontextprotocol/python-sdk

X Title: Sending cancellation notification to server based on client anyio.CancelScope status by davemssavage · Pull Request #628 · modelcontextprotocol/python-sdk

Description: Motivation and Context MCP 2025-03-26 introduces a cancellation notification [1] this patch simplifies the usage of this function for the ClientSession by using the anyio.CancelScope as a trigger to send the cancellation notification and is a potential fix for #160 How Has This Been Tested? Added unit tests to assert behaviour and tidied up previous work around for lack of this behaviour in tests/shared/test_session.py#test_request_cancellation Breaking Changes This patch sends a CancelNotification to any in flight requests to the server at the point the client is cancelled. Clients that would have expected calls to complete on the server regardless of status of cancel scope on the client will need to be updated. As a work around for any clients where this behavior is not desired this patch adds a cancellable flag to send_request and call_tool to enable clients to opt out of this behaviour so server tasks must respond prior to exitting. This cancellable=False behaviour is required for the initialised call from the client as described in [1] though this does open up a raft of questions on what is supposed to happen if the initialised call blocks on the server. A timeout on the client might be appropriate however this opens up follow on questions on what subsequent behaviour should be after an initialisation timeout. This approach of a breaking change is suggested as author expects in general most clients would prefer to cancel an expensive server tasks if client is cancelled and initialisation tasks are expected to be quick and non-blocking on the server. Types of changes Bug fix (non-breaking change which fixes an issue) New feature (non-breaking change which adds functionality) Breaking change (fix or feature that would cause existing functionality to change) Documentation update Checklist I have read the MCP Documentation My code follows the repository's style guidelines New and existing tests pass locally I have added appropriate error handling I have added or updated documentation as needed Additional context I've added a docstring to describe the behaviour to send request. I suspect wider documentation updates would be sensible, I'm happy to write something if this patch looks useful. It might also be useful to separate out the idea of client cancelation with server cancelation such that a client can cancel its work but leave the server task running. Comments on the pull request on the best approach is probably necessary. [1] https://modelcontextprotocol.io/specification/2025-03-26/basic/utilities/cancellation

Open Graph Description: Motivation and Context MCP 2025-03-26 introduces a cancellation notification [1] this patch simplifies the usage of this function for the ClientSession by using the anyio.CancelScope as a trigger t...

X Description: Motivation and Context MCP 2025-03-26 introduces a cancellation notification [1] this patch simplifies the usage of this function for the ClientSession by using the anyio.CancelScope as a trigger t...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/628

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f9598ad attempt to support cancelation davemssavage May 4, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/f9598ad80719ec72320d6d34bca1b899613b8510
dfb3686 fix sending cancel davemssavage May 4, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/dfb3686a5d1f7385f31b714d5a420af630ae773c
abda067 add decorator for handling cancelation davemssavage May 4, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/abda067134a421878a9ce0fd6e99ed3b2c09122b
24553c6 fix capitalisation on error message davemssavage May 4, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/24553c65abd4944eeb4209955a85500ef6362ded
fe49931 try to check notification event received davemssavage May 4, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/fe49931a390f0a2e2cda651dc230e404c470f671
efd0ffd fix test davemssavage May 4, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/efd0ffdd8ed5e2d0bfe2a19811473312032364a4
1364b7a fix debug message davemssavage May 4, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/1364b7a358421d202563032cc73cee741d389fc4
17ae44c prevent cancel on intialisation as per https://modelcontextprotocol.i… davemssavage May 4, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/17ae44cec83543c7deba209702e4373b05d2da04
06f4b3c remove unused imports davemssavage May 4, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/06f4b3c5a3108ace2bd7028e562bd13d82b56dc7
07e1a52 fixed long line davemssavage May 4, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/07e1a525b02faff8f2fee9894daaaaeffc57afa5
92f806b fixed long line davemssavage May 4, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/92f806b95912575673116c46511253c0756d8eb7
e46c693 updates from ruff format davemssavage May 4, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/e46c693290afd29c178467fc7d25ebe87cecbc34
2a24e0c removed dev print statements committed by mistake davemssavage May 4, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/2a24e0cba16d21e68d93e79e7d61d834a9ae9bf5
87722f8 add constant for request cancelled and use it in case of cancelled task davemssavage May 4, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/87722f8bfdf8876400207cdcf940fd4dc1e3a5e9
f0782d2 fix long line davemssavage May 4, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/f0782d251c64275df6a248bb1a779f5d2dc24699
a0164f9 fix import order davemssavage May 4, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/a0164f989904e6f649df64ab057ac3e88cfc1bf9
bf220d5 add assert that cancel scope triggered on server, add comments for re… davemssavage May 5, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/bf220d58b534d9de68386bb565b19e6c8c0ee392
45ac52a trivial update to comment capitalisation davemssavage May 5, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/45ac52ae33105c489aaba1f014cb27759085fee7
8b7f1cd simplify test code davemssavage May 5, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/8b7f1cda328c2119883ab5e1d8822bc1faf64154
ac4b822 add tests to assert cancellable=False behaves as expected davemssavage May 5, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/ac4b8226069f53dff177cfe2d80bdaa6120e1546
d86b4a5 tidy up ruff check davemssavage May 5, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/d86b4a51934d2a5954a6116f06386fd5007959b4
6f4ae44 ruff format update davemssavage May 5, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/6f4ae44cad46342e6c0154848b7a8b96aad2eeda
11d2e52 fixed test description davemssavage May 5, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/11d2e5296c9b47af312a0abc595248a4d0aa1b1d
235df35 use defined types in decorator davemssavage May 5, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/235df35de77e039653af0e20cf48f029225ec38c
f96aaa5 Add docstring info for cancellable and add TODO note for initialised … davemssavage May 5, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/f96aaa58dc4c7f8f894c7c300ee65e34cbadded5
bd73448 set read_timeout_seconds to avoid test blocking for ever in case some… davemssavage May 5, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/bd73448b72897d1f18ca063e6cfd35b049c1216c
3817fe2 remove unnecessary shielded cancel scope davemssavage May 5, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/3817fe2f9d178ea1bea7f9354ff18b3315d805ba
2fd27a2 whitespace davemssavage May 5, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/2fd27a28e883f27ee5c6a17a5c547cc19790c3e2
2e86d32 clarified doc string comment davemssavage May 6, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/2e86d32de05334e0f2cff4591d929631ca3f30db
1039b99 fixed doc string and added comment on internal notification method davemssavage May 6, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/1039b993ee8d11474f0d1a98668694f3cca91fc2
b926970 Merge branch 'main' into cancellation davemssavage May 9, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/b926970b960368b95230c295ac2e05efe2e9e33c
cf1bb2b merge from upstream main davemssavage May 17, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/cf1bb2b95ad386c0a7566bf6b289c654b6bc3b3e
39f7739 ignore type warning for internal use of send_notification davemssavage May 17, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/39f7739a8fbb2f05d2d0a0d0c8d2f8cf71f218b7
598756d Merge branch 'main' into cancellation davemssavage May 24, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/598756d2a23afc08d5b2c6c8ae16e2ff9811cbe6
4842cee Merge branch 'main' into cancellation davemssavage Jun 27, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/4842cee2965597599063c989c1e2b698e130e29d
8f2cfca ruff format davemssavage Jun 28, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/8f2cfcaf0b27dd3e3b5c9d10422deb8397d48e02
64a2ae0 remove unused import davemssavage Jun 28, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/628/commits/64a2ae084aafccb357022566ef2167f9b605e5b1
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