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Title: Asynchronous Tool Execution by LucaButBoring · Pull Request #1398 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: Asynchronous Tool Execution by LucaButBoring · Pull Request #1398 · modelcontextprotocol/python-sdk

X Title: Asynchronous Tool Execution by LucaButBoring · Pull Request #1398 · modelcontextprotocol/python-sdk

Description: The official Python SDK for Model Context Protocol servers and clients - Asynchronous Tool Execution by LucaButBoring · Pull Request #1398 · modelcontextprotocol/python-sdk

Open Graph Description: This PR implements the required changes for modelcontextprotocol/modelcontextprotocol#1391, which adds asynchronous tool execution. This is a large PR, and I expect that if the associated SEP is ac...

X Description: This PR implements the required changes for modelcontextprotocol/modelcontextprotocol#1391, which adds asynchronous tool execution. This is a large PR, and I expect that if the associated SEP is ac...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/1398

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LucaButBoring:feat/async-toolshttps://github.com/LucaButBoring/mcp-python-sdk/tree/feat/async-tools
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Sep 25, 2025https://github.com/modelcontextprotocol/python-sdk/pull/1398#issue-3451626195
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modelcontextprotocol/modelcontextprotocol#1391https://github.com/modelcontextprotocol/modelcontextprotocol/issues/1391
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Please reload this pagehttps://github.com/modelcontextprotocol/python-sdk/pull/1398
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September 19, 2025 13:57https://github.com/modelcontextprotocol/python-sdk/pull/1398#commits-pushed-395194a
https://github.com/LucaButBoring
Implement new data models for async tools (SEP-1391)https://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/395194a960c02d513d16e15bbf031be9302d7f36
395194ahttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/395194a960c02d513d16e15bbf031be9302d7f36
https://github.com/LucaButBoring
Add "next" protocol version to isolate async tools from existing clientshttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/cbda6e336e935c7e29a8cae906a9c691291af31c
cbda6e3https://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/cbda6e336e935c7e29a8cae906a9c691291af31c
https://github.com/LucaButBoring
Implement session functions for async toolshttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/e5e4078bedc1e7b9c5efb443ba45d7232f30de72
e5e4078https://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/e5e4078bedc1e7b9c5efb443ba45d7232f30de72
https://github.com/LucaButBoring
Implement server-side handling for async tool callshttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/7dd550b40867d58571e910235aa4838890908dbd
7dd550bhttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/7dd550b40867d58571e910235aa4838890908dbd
https://github.com/LucaButBoring
Rename types for latest SEP-1391 revisionhttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/8d281be6bb55200db9f7bb06e71f0603087dee8c
8d281behttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/8d281be6bb55200db9f7bb06e71f0603087dee8c
https://github.com/LucaButBoring
Handle cancellation notifications on async opshttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/0dc8d430d614b8c7d55fb63bcfbd68f0f5eb3db7
0dc8d43https://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/0dc8d430d614b8c7d55fb63bcfbd68f0f5eb3db7
https://github.com/LucaButBoring
Implement support for input_required statushttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/e70f44190c78e83e6f6c3da5380fa0788cd616b2
e70f441https://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/e70f44190c78e83e6f6c3da5380fa0788cd616b2
https://github.com/LucaButBoring
Support configuring the broadcasted client versionhttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/207923048448467d6117ba9be0d3a75730041f59
2079230https://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/207923048448467d6117ba9be0d3a75730041f59
https://github.com/LucaButBoring
Pass AsyncOperations from FastMCP to Serverhttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/04bac419f22c2dfb3296d1f7dace776441fe1dd2
04bac41https://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/04bac419f22c2dfb3296d1f7dace776441fe1dd2
https://github.com/LucaButBoring
Implement lowlevel async CallToolhttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/2df5e7cba50450a1315b78421e4ad42181a5ec36
2df5e7chttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/2df5e7cba50450a1315b78421e4ad42181a5ec36
https://github.com/LucaButBoring
Implement async tools snippetshttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/759a9a39928808440bc78176b0c2bdc28c7769dc
759a9a3https://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/759a9a39928808440bc78176b0c2bdc28c7769dc
https://github.com/LucaButBoring
Implement optoken to tool name map on client end for validationhttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/011a363ea3db59baadf1d69e9859d4c0c047144f
011a363https://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/011a363ea3db59baadf1d69e9859d4c0c047144f
https://github.com/LucaButBoring
Support configuring async tool keepaliveshttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/e40055a40f9b65376b7eaaa129feafe2192ff33a
e40055ahttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/e40055a40f9b65376b7eaaa129feafe2192ff33a
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Control async op expiry by resolved_at, not created_athttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/600982effc364f42233256d5bd88087f1c78ee2b
600982ehttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/600982effc364f42233256d5bd88087f1c78ee2b
https://github.com/LucaButBoring
Add snippet for async tool with keepalivehttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/37fb963cf689e4bd3fe7baaa5aa0339c5e2f609c
37fb963https://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/37fb963cf689e4bd3fe7baaa5aa0339c5e2f609c
https://github.com/LucaButBoring
Support progress in async toolshttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/f8ca895454038fe58e7bcd4a230df5d9baafe586
f8ca895https://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/f8ca895454038fe58e7bcd4a230df5d9baafe586
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LucaButBoringhttps://github.com/LucaButBoring
Sep 25, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1398#ref-issue-3357404258
SEP-1391: Long-Running Operations modelcontextprotocol/modelcontextprotocol#1391 https://github.com/modelcontextprotocol/modelcontextprotocol/issues/1391
https://github.com/LucaButBoring
Operation token plumbing to support async elicitation/samplinghttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/b802dc423bc74458830bfdcb3626ac55ca77bcaf
b802dc4https://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/b802dc423bc74458830bfdcb3626ac55ca77bcaf
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Sep 26, 2025https://github.com/modelcontextprotocol/python-sdk/pull/1398#issuecomment-3336624785
commithttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/b802dc423bc74458830bfdcb3626ac55ca77bcaf
Please reload this pagehttps://github.com/modelcontextprotocol/python-sdk/pull/1398
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September 26, 2025 13:33https://github.com/modelcontextprotocol/python-sdk/pull/1398#commits-pushed-047664f
https://github.com/LucaButBoring
Add decorator parameter for immediate return value in LROhttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/047664f63f417eff93ec9ac91881f4c97537a51a
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Support configuring immediate LRO resulthttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/07a2821d0689bb505f65501b7a0a3fde3e2684a6
07a2821https://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/07a2821d0689bb505f65501b7a0a3fde3e2684a6
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Fix code complexity issue in sHTTPhttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/2943631ece87d0c8c8093e2f323dae35cbf71890
2943631https://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/2943631ece87d0c8c8093e2f323dae35cbf71890
https://github.com/LucaButBoring
LucaButBoringhttps://github.com/LucaButBoring
Sep 29, 2025https://github.com/modelcontextprotocol/python-sdk/pull/1398#issuecomment-3348258709
Please reload this pagehttps://github.com/modelcontextprotocol/python-sdk/pull/1398
LucaButBoringhttps://github.com/LucaButBoring
September 29, 2025 12:02https://github.com/modelcontextprotocol/python-sdk/pull/1398#commits-pushed-e6a12e1
https://github.com/LucaButBoring
Merge branch 'main' ofhttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/e6a12e13c5beb364aa49a1d7a3a8ad22901abca4
https://github.com/modelcontextprotocol/python…https://github.com/modelcontextprotocol/python-sdk
e6a12e1https://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/e6a12e13c5beb364aa49a1d7a3a8ad22901abca4
…-sdkhttps://github.com/modelcontextprotocol/python-sdk
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Add basic documentation for async toolshttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/4539c597884acd093fe2ca12ab8ec372824971e2
4539c59https://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/4539c597884acd093fe2ca12ab8ec372824971e2
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Remove misplaced server testhttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/97be6dd26d26a2d2cb4f5ad087548eadd7baa78b
97be6ddhttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/97be6dd26d26a2d2cb4f5ad087548eadd7baa78b
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Split up async tool snippets to improve README readabilityhttps://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/b0d3f305d1dce1a88cbe73d18909d327f22ae010
b0d3f30https://github.com/modelcontextprotocol/python-sdk/pull/1398/commits/b0d3f305d1dce1a88cbe73d18909d327f22ae010
https://github.com/LucaButBoring
LucaButBoringhttps://github.com/LucaButBoring
September 29, 2025 21:25https://github.com/modelcontextprotocol/python-sdk/pull/1398#event-19993815467
https://github.com/Kludex
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Oct 2, 2025https://github.com/modelcontextprotocol/python-sdk/pull/1398#issuecomment-3360193317
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View reviewed changes https://github.com/modelcontextprotocol/python-sdk/pull/1398/files/2ed562eb667a5ba2d4425f6c247ea4361d8b95b8
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