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Title: [v2] ClientSession runs on JSONRPCDispatcher; BaseSession removed by maxisbey · Pull Request #2838 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: [v2] ClientSession runs on JSONRPCDispatcher; BaseSession removed by maxisbey · Pull Request #2838 · modelcontextprotocol/python-sdk

X Title: [v2] ClientSession runs on JSONRPCDispatcher; BaseSession removed by maxisbey · Pull Request #2838 · modelcontextprotocol/python-sdk

Description: The official Python SDK for Model Context Protocol servers and clients - [v2] ClientSession runs on JSONRPCDispatcher; BaseSession removed by maxisbey · Pull Request #2838 · modelcontextprotocol/python-sdk

Open Graph Description: V2 client receive path: Transport -> JSONRPCDispatcher -> ClientSession callbacks, replacing the BaseSession receive loop. Companion to #2710, which did the same for the server seat; BaseSess...

X Description: V2 client receive path: Transport -> JSONRPCDispatcher -> ClientSession callbacks, replacing the BaseSession receive loop. Companion to #2710, which did the same for the server seat; ...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2838

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[v2] ClientSession runs on JSONRPCDispatcher; BaseSession removedhttps://github.com/modelcontextprotocol/python-sdk/pull/2838#top
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Jun 11, 2026https://github.com/modelcontextprotocol/python-sdk/pull/2838#issue-4642346713
Please reload this pagehttps://github.com/modelcontextprotocol/python-sdk/pull/2838
#2710https://github.com/modelcontextprotocol/python-sdk/pull/2710
Fix unknown-method error code and add a protocol version registry #2836https://github.com/modelcontextprotocol/python-sdk/pull/2836
#2489https://github.com/modelcontextprotocol/python-sdk/issues/2489
#2507https://github.com/modelcontextprotocol/python-sdk/issues/2507
#2490https://github.com/modelcontextprotocol/python-sdk/pull/2490
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https://github.com/maxisbey
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June 12, 2026 14:29https://github.com/modelcontextprotocol/python-sdk/pull/2838#event-26679749205
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Cover the remaining client-session branches and document the migrationhttps://github.com/modelcontextprotocol/python-sdk/pull/2838/commits/ad471bed43a8ccfdbb7ca94ee6983b103d260f52
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Remove the client-side related_request_id surfacehttps://github.com/modelcontextprotocol/python-sdk/pull/2838/commits/07f1b6d195da62a24492a0bdc43c12c5a4c06025
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June 15, 2026 12:21https://github.com/modelcontextprotocol/python-sdk/pull/2838#commits-pushed-9dedb40
https://github.com/maxisbey
Heal 3.11 coverage tracing in the new dispatcher testshttps://github.com/modelcontextprotocol/python-sdk/pull/2838/commits/9dedb40ef4f76e28fcbf106439ddda8c8817bc29
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ci(conformance): run server --suite draft and baseline the 2026-07-28 scenarios #2878 https://github.com/modelcontextprotocol/python-sdk/pull/2878
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ClientSession never sends notifications/cancelled when call_tool is cancelled — server-side coroutines leak https://github.com/modelcontextprotocol/python-sdk/issues/2507
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