Asynchronous Tool Execution#1398

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LucaButBoring wants to merge 45 commits intomodelcontextprotocol:mainfrom

LucaButBoring:feat/async-tools

Commits on Sep 19, 2025

Implement new data models for async tools (SEP-1391)
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Add "next" protocol version to isolate async tools from existing clients
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Implement session functions for async tools
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Commits on Sep 22, 2025

Implement server-side handling for async tool calls
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Commits on Sep 23, 2025

Rename types for latest SEP-1391 revision
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Handle cancellation notifications on async ops
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Implement support for input_required status
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Commits on Sep 24, 2025

Support configuring the broadcasted client version
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Pass AsyncOperations from FastMCP to Server
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Implement lowlevel async CallTool
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Implement async tools snippets
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Implement optoken to tool name map on client end for validation
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Support configuring async tool keepalives
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Control async op expiry by resolved_at, not created_at
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Add snippet for async tool with keepalive
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Support progress in async tools
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Commits on Sep 26, 2025

Operation token plumbing to support async elicitation/sampling
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Add decorator parameter for immediate return value in LRO
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Commits on Sep 27, 2025

Support configuring immediate LRO result
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Fix code complexity issue in sHTTP
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Commits on Sep 29, 2025

Merge branch 'main' of https://github.com/modelcontextprotocol/python-sdk into feat/async-tools
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Add basic documentation for async tools
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Remove misplaced server test
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Split up async tool snippets to improve README readability
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Commits on Oct 1, 2025

Move operations into "working" state before tool execution
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Add reconnect example for async tools
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Merge branch 'main' into feat/async-tools
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0a5373e
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Fix README formatting
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Remove usages of asyncio in tests
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Update README snippets
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Use anyio instead of asyncio in lowlevel server
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Apply Copilot suggestions
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Commits on Oct 3, 2025

Use server TaskGroup to fix operations blocking CallTool requests
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Merge branch 'main' into feat/async-tools
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Remove vestigial session operation cancellation
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Commits on Oct 6, 2025

Merge branch 'main' of https://github.com/modelcontextprotocol/python-sdk into feat/async-tools
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c2f8bb1
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Fully switch AsyncOperationManager to anyio
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import Self from typing_extensions for Python 3.10
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Fix sync/async detection and add failing test for reconnects
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428e7a4
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Fix async test assertion
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Commits on Oct 7, 2025

Convert ServerAsyncOperationManager into async context manager
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Tidy up debug/test cruft
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Commits on Oct 8, 2025

Split ServerAsyncOperationManager into AsyncOperationStore and AsyncOperationBroker components
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Commits on Oct 11, 2025

Add dedicated event queues to fix IO and be transport-agnostic
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Clean up LRO code and update docs
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