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Title: Feature: Non-Blocking call_tool and request state externalisation by davemssavage · Pull Request #1209 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: Feature: Non-Blocking call_tool and request state externalisation by davemssavage · Pull Request #1209 · modelcontextprotocol/python-sdk

X Title: Feature: Non-Blocking call_tool and request state externalisation by davemssavage · Pull Request #1209 · modelcontextprotocol/python-sdk

Description: This patch enables a non-blocking mode of running tools and introduces a RequestStateManager plugin api - this allows for long running tasks to be rejoined on the client and across process restarts. Motivation and Context Rather than introducing new protocol messages as per modelcontextprotocol/modelcontextprotocol#617 this patch uses the existing protocol messages with client side changes to allow the client application to submit a call request and then later join that request to get the response and/or any progress notifications that may have occured. This works on top of the existing session resume processes so a client can submit a task in one process and rejoin from another if a persistent version of RequestStateManager is used (this has been tested using a redis implementation - not included in this patch) Long running tasks currently consume resources indefinitely on the client blocking until they return, Tool calls can currently timeout allowing control to return to the client however this leads to a messy control flow that exposes the internal details of the protocol implementaton - having to check the type of code is httpx.codes.REQUEST_TIMEOUT. This patch instead introduces new methods request_call_tool and join_call_tool that handle various complex issues with resume tokens and via state stored in a pluggable RequestStateManager. An InMemoryRequestStateManager is provided as the default, other external state managers can be provided to the ClientSession to allow for persistence outside of process memory. How Has This Been Tested? This has been unit tested and tested on a server application that managed multiple sessions without blocking the server side threads. Breaking Changes None 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 In order to handle some complex logic around resumption this patch introduces a new ResumeCapability which can be returned during initialisation. It currently is hard coded to assume that if streamable_http protocol is used then server sessions are resumeable. It may be worth while extending this along the lines of modelcontextprotocol/modelcontextprotocol#617 where servers can indicate how long clients might expect a session to be resumable for. Testing on a non-trivial application has highlighted that at least one progress notification needs to be sent from the server prior to the start_request call returning a request_id. This is due to needing at least one event to trigger the sse.event_id to be passed back to the client for the resume token to be collected. This is a little opaque and relies on the client having passed a progress callback in the start_call_tool method. A new protocol notification sent from the server to indicate it has received the request could be a viable alternative, however one of the benefits of this is patch over modelcontextprotocol/modelcontextprotocol#617 is it is trying to avoid new protocol messages.

Open Graph Description: This patch enables a non-blocking mode of running tools and introduces a RequestStateManager plugin api - this allows for long running tasks to be rejoined on the client and across process restarts...

X Description: This patch enables a non-blocking mode of running tools and introduces a RequestStateManager plugin api - this allows for long running tasks to be rejoined on the client and across process restarts...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/1209

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4165200 add methods to enable call tool requests to be started and joined at … davemssavage Jul 12, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1209/commits/416520004fb5465a9e6a447b3bdd8e82265f5f1b
04ff73a refactor args for clearer meaning, use error vs returning none on tim… davemssavage Jul 12, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1209/commits/04ff73a13076307a3370cdeaea88987377f27cbc
288ebe3 add resume logic to request/join call_tool functions davemssavage Jul 14, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1209/commits/288ebe33946d38170ca22b2e3cd9f4735c704d02
40028da Remove None as valid return type from join_call_tool, fix typo ImMemo… davemssavage Jul 14, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1209/commits/40028daa6880f086b713a3e220aa03c710aad2be
161da46 send resume on init rather than part of join, refactor resume to be g… davemssavage Jul 14, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1209/commits/161da461428d34e60122a2d012bfaafcc13a69d7
aa2cbec fix import error davemssavage Jul 16, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1209/commits/aa2cbec9340226c2b3a3a53804467a8121c30acd
7329cba Refactor code to send resume as part of join call rather than it, thi… davemssavage Jul 26, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1209/commits/7329cba1f0369eb95d24a0a9322545d697a24ddb
e4c25b7 simplify token capture using events rather than streams, add test for… davemssavage Jul 27, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1209/commits/e4c25b738bacd5dde0e29f89666adb224f8dd4b3
79f3c4e avoid exceptions during join call tool on timeout as this is expected… davemssavage Jul 28, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1209/commits/79f3c4e9d33872400ca788bdc006cf7b2e091fd5
6c47890 Merge branch 'main' into feature/call-futures davemssavage Jul 28, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1209/commits/6c478903148261ef25ee874461d318bd47a13f95
f262bb6 uv ruff fixes davemssavage Jul 28, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1209/commits/f262bb69dd83c2f27078f819cef29528cb060a51
c5eab90 add assert for pyright checks davemssavage Jul 28, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1209/commits/c5eab90c9b1ab68d80105b0e060712e2bb2ffc74
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a8ffd71 pass related request id on progress to allow this to trigger event id… davemssavage Aug 16, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1209/commits/a8ffd713c987ea001d75c753d7c4133ed8649bed
cca5e34 ruff format fixes davemssavage Aug 16, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1209/commits/cca5e342c93b8a70302ad2519389e779858342c2
5750c32 Merge branch 'main' into feature/call-futures davemssavage Aug 16, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1209/commits/5750c3284d5aa6ce09dc47e14e43759a3f6a02aa
f1a973a use move on after rather than fail_after to simplify code for the sam… davemssavage Aug 18, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1209/commits/f1a973af9a2eecfcd578c555e58b5ed297fd93c3
746d3b8 add timeout to request_call_tool to enable clients to unblock if serv… davemssavage Aug 20, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1209/commits/746d3b8024b6aa5e1acdfe6f2e7138d8b5e06420
92a6ead ruff format fixes davemssavage Aug 24, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1209/commits/92a6eadbec99d5556e6910b62b617414c11179a3
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06e356f fix broken tests due to new tool being added davemssavage Aug 24, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1209/commits/06e356fe0dcb3076f85912be5ae860e1da25df39
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