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Title: SEP-2322: Multi Round-Trip Requests by CaitieM20 · Pull Request #2322 · modelcontextprotocol/modelcontextprotocol · GitHub

Open Graph Title: SEP-2322: Multi Round-Trip Requests by CaitieM20 · Pull Request #2322 · modelcontextprotocol/modelcontextprotocol

X Title: SEP-2322: Multi Round-Trip Requests by CaitieM20 · Pull Request #2322 · modelcontextprotocol/modelcontextprotocol

Description: Specification and documentation for the Model Context Protocol - SEP-2322: Multi Round-Trip Requests by CaitieM20 · Pull Request #2322 · modelcontextprotocol/modelcontextprotocol

Open Graph Description: This is a draft SEP for Multi Round-Trip Requests (MRTR) from the Transports Working Group. It is one of the changes discussed and planned at the December 2025 Core Maintainer Meetup. Exploring the...

X Description: This is a draft SEP for Multi Round-Trip Requests (MRTR) from the Transports Working Group. It is one of the changes discussed and planned at the December 2025 Core Maintainer Meetup. Exploring the...

Opengraph URL: https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322

X: @github

direct link

Domain: github.com

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SEP-2322: Multi Round-Trip Requests https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322#top
CaitieM20https://github.com/CaitieM20
modelcontextprotocol:mainhttps://github.com/modelcontextprotocol/modelcontextprotocol/tree/main
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https://github.com/CaitieM20
CaitieM20https://github.com/CaitieM20
Feb 28, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322#issue-4005097442
Please reload this pagehttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322
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Conformance Tests for SEP-2322 MRTR conformance#188https://github.com/modelcontextprotocol/conformance/pull/188
Please reload this pagehttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322
CaitieM20https://github.com/CaitieM20
February 20, 2026 10:36https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322#commits-pushed-b4f29a6
https://github.com/CaitieM20
add SEP doc from transport-wghttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/b4f29a636d669a932f833ad8921e416511c378a2
b4f29a6https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/b4f29a636d669a932f833ad8921e416511c378a2
https://github.com/CaitieM20
copilot initial pass, still WIP and under my reviewhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/a1b65dc8ced1eecda87462b6523f0019114af065
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Merge branch 'modelcontextprotocol:main' into SEP-MRTRhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/12d910cbf3d6e167923c5371ff19c68f538becfc
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hand editshttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/21b44818646b310c28da98591a4da090bf4909e8
21b4481https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/21b44818646b310c28da98591a4da090bf4909e8
https://github.com/CaitieM20
add Incomplete Result to server result, add sections to schema.mdx, r…https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/df843c7b75eaec752a07a5df5a39eb41f73451d3
df843c7https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/df843c7b75eaec752a07a5df5a39eb41f73451d3
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1. Moved inputResponses/requestState from CallToolRequestParams → Req…https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/2bec19bcc1f790f9d72e866ab80dfa5aceed10eb
2bec19bhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/2bec19bcc1f790f9d72e866ab80dfa5aceed10eb
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renamed ElicitationInputRequest → ElicitationCreateRequest and Sampli…https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/7519d64bd2169a6381ec65db58d51090f1dbd06e
7519d64https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/7519d64bd2169a6381ec65db58d51090f1dbd06e
https://github.com/CaitieM20
removing standalone ServerRequests for CreateMessageRequests and Elic…https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/8b66f20d4bc451cdfdd6658348feba6cf2013ef5
8b66f20https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/8b66f20d4bc451cdfdd6658348feba6cf2013ef5
https://github.com/CaitieM20
update exampleshttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/ca03c4eeb521554de875bc1d65f4490e49998927
ca03c4ehttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/ca03c4eeb521554de875bc1d65f4490e49998927
https://github.com/CaitieM20
moving JSONRPCIncompleteResultResponse location in schema.tshttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/944a6a52450844f1a9f5d2999778b4feb921b931
944a6a5https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/944a6a52450844f1a9f5d2999778b4feb921b931
https://github.com/CaitieM20
update GetTaskPayloadResultResponse to be a JSONRPCResultResponse or …https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/ac8b3e6b5a7d2a79c5929ea767f377419ef42a21
ac8b3e6https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/ac8b3e6b5a7d2a79c5929ea767f377419ef42a21
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update SEP.md to reflect schema changes. Decision: Remove results wra…https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/4f859d1c183434ce270fd9759c9e6bafac71d555
4f859d1https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/4f859d1c183434ce270fd9759c9e6bafac71d555
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remove URLElicitationRequiredErrorhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/053d9cba09a31e30078bc32a171b3420a938b9c7
053d9cbhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/053d9cba09a31e30078bc32a171b3420a938b9c7
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updating SEP examples to adhere strictly to schemahttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/9fd8ddec89ddb5e5cc70e6e3236416c3e0ffe857
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WIP on updating Spec to be more readable, added new spec V2 to test o…https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/c741ca4eccd8a125d8891fe7f9741f398d067a7b
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schema changes for ephemeral workflowhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/2d37d9de6d0828dbc11b922e6733480ff9f00952
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schema changes for persistent workflowhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/08cffb17180c070c8d0efc01d2bba1e1fbf6f782
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Merge branch 'main' into SEP-MRTRhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/7980bf56dea85876b5a72d2a63f475e7bfb23059
7980bf5https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/7980bf56dea85876b5a72d2a63f475e7bfb23059
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Merge branch 'main' into SEP-MRTRhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/4e68c962b2fb2e409a4886f82863dd902f1475e1
4e68c96https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/4e68c962b2fb2e409a4886f82863dd902f1475e1
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fix examples form parameter accidentally removedhttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/0a778244a0a69839edabcbb024b7257ea98fabaa
0a77824https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/0a778244a0a69839edabcbb024b7257ea98fabaa
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removing experimental editshttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/65772eddb2a972af9f440ce7d46984407713a4fb
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merging in XXXX-MRTR.md changes in from transport-wg repohttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/5cc289d57e6c72070932a2807b81ddb3422ca9c7
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fix date typohttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/901013777f7a7d9a84546159a8e48ba38fb94e80
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Merge branch 'SEP-MRTR' into mrtr-sephttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/ef5dabc0aa0d7e125e3a08baf9034523969b62ff
ef5dabchttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/ef5dabc0aa0d7e125e3a08baf9034523969b62ff
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Merge pull requesthttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/fbb388e1f0c0d7b910b2a387ab4290755b69f403
#2https://github.com/CaitieM20/modelcontextprotocol/pull/2
from markdroth/mrtr-sephttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/fbb388e1f0c0d7b910b2a387ab4290755b69f403
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fixing some schema merge errors and deleting no longer used examplehttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/f01df3c3141ba150df587842584c5688447faed9
f01df3chttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/f01df3c3141ba150df587842584c5688447faed9
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remove JSONRPCIncompleteResultTypehttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/aaa44a3eff9e4e433fd115ec4b438bb27482ff99
aaa44a3https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/aaa44a3eff9e4e433fd115ec4b438bb27482ff99
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add back examples fix GetTaskPayloadResultResponsehttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/3fc57a1b03e2cc1d9f036dfd41df40e137d16851
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removing duplicate typeshttps://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322/commits/bdc62ac719338bbc78595101e41dceec1de95d55
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May 11, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322#ref-issue-3530932859
SEP-1685: Add State Meta Field to ServerRequest and ServerResponse #1685 https://github.com/modelcontextprotocol/modelcontextprotocol/issues/1685
https://github.com/CaitieM20
CaitieM20https://github.com/CaitieM20
May 12, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322#ref-pullrequest-4425339911
Write updated docs and port SEP-2663 content modelcontextprotocol/ext-tasks#2 https://github.com/modelcontextprotocol/ext-tasks/pull/2
https://github.com/CaitieM20
CaitieM20https://github.com/CaitieM20
May 21, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322#ref-pullrequest-4498256859
Fixing doc bugs, missing required fields #2764 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2764
https://github.com/LucaButBoring
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May 22, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322#ref-pullrequest-4505356633
fix(SEP-2322): Explicitly support extending ResultType #2773 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2773
[2026-07-28] Stateless Core overhaul modelcontextprotocol/php-sdk#334 https://github.com/modelcontextprotocol/php-sdk/issues/334
[Server][Transport] SEP-2322: Multi Round-Trip Requests on Streamable HTTP modelcontextprotocol/php-sdk#342 https://github.com/modelcontextprotocol/php-sdk/issues/342
https://github.com/jayaraman-venkatesan
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May 27, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322#ref-issue-4479902290
SEP-2260: Require Server requests to be associated with a Client request modelcontextprotocol/csharp-sdk#1589 https://github.com/modelcontextprotocol/csharp-sdk/issues/1589
https://github.com/felixweinberger
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May 29, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322#ref-issue-4547535782
Implement SEP-2322: Multi Round-Trip Requests modelcontextprotocol/typescript-sdk#2187 https://github.com/modelcontextprotocol/typescript-sdk/issues/2187
https://github.com/alexhancock
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Jun 2, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322#ref-issue-4573024584
Implement SEP-2322: Multi Round-Trip Requests modelcontextprotocol/rust-sdk#871 https://github.com/modelcontextprotocol/rust-sdk/issues/871
https://github.com/localden
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Jun 4, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322#event-26317912888
https://github.com/localden
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Implement SEP-2322: Multi Round-Trip Requests modelcontextprotocol/go-sdk#993 https://github.com/modelcontextprotocol/go-sdk/issues/993
SEP-2322: Multi Round-Trip Requests modelcontextprotocol/java-sdk#1004 https://github.com/modelcontextprotocol/java-sdk/issues/1004
Implement SEP-2322: Multi Round-Trip Requests modelcontextprotocol/kotlin-sdk#808 https://github.com/modelcontextprotocol/kotlin-sdk/issues/808
Implement SEP-2322: Multi Round-Trip Requests modelcontextprotocol/python-sdk#2797 https://github.com/modelcontextprotocol/python-sdk/issues/2797
SEP-2322: Multi Round-Trip Requests modelcontextprotocol/ruby-sdk#382 https://github.com/modelcontextprotocol/ruby-sdk/issues/382
Implement SEP-2322: Multi Round-Trip Requests modelcontextprotocol/swift-sdk#238 https://github.com/modelcontextprotocol/swift-sdk/issues/238
(implementation): SEP-2322 - Multi Round-Trip Requests #2877 https://github.com/modelcontextprotocol/modelcontextprotocol/issues/2877
chore(core): remove the RootsRegistry placeholder cyanheads/mcp-ts-core#218 https://github.com/cyanheads/mcp-ts-core/issues/218
chore(context): remove ctx.sample — Sampling deprecated by SEP-2577 (MCP 2026-07-28) cyanheads/mcp-ts-core#220 https://github.com/cyanheads/mcp-ts-core/issues/220
https://github.com/maxisbey
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Jun 17, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322#ref-issue-4682674950
MRTR (multi-round-trip requests) modelcontextprotocol/python-sdk#2898 https://github.com/modelcontextprotocol/python-sdk/issues/2898
feat: support dynamic MCP primitive repositories modelcontextprotocol/java-sdk#953 https://github.com/modelcontextprotocol/java-sdk/pull/953
Add Primitive repository APIs (ResourceRepository, ToolsRepository, ... ) modelcontextprotocol/java-sdk#578 https://github.com/modelcontextprotocol/java-sdk/issues/578
https://github.com/sosh-ncampbell
sosh-ncampbellhttps://github.com/sosh-ncampbell
Jun 22, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322#ref-issue-4716988706
MCP-001: Migrate workspace to MCP 2026-07-28 RC spec greysquirr3l/stygian#95 https://github.com/greysquirr3l/stygian/issues/95
https://github.com/felixweinberger
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Jun 26, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322#ref-pullrequest-4650383987
Implement MCP 2026-07-28 modelcontextprotocol/typescript-sdk#2286 https://github.com/modelcontextprotocol/typescript-sdk/pull/2286
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Jun 29, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322#ref-issue-4767370155
[MCP: SEP Tracker] Week of 2026-06-29 jeffhandley/dotnet-vitals-servicing-release-manager#27 https://github.com/jeffhandley/dotnet-vitals-servicing-release-manager/issues/27
https://github.com/koic
koichttps://github.com/koic
Jun 30, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322#ref-pullrequest-4775522526
Recognize multi round-trip input_required results per SEP-2322 modelcontextprotocol/ruby-sdk#433 https://github.com/modelcontextprotocol/ruby-sdk/pull/433
koichttps://github.com/koic
Jul 11, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322#ref-commit-4401833
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Recognize multi round-trip input_required results per SEP-2322https://github.com/modelcontextprotocol/ruby-sdk/commit/4401833333944bc5176ca86eefd23480beb4c8c3
4401833https://github.com/modelcontextprotocol/ruby-sdk/commit/4401833333944bc5176ca86eefd23480beb4c8c3
modelcontextprotocol/modelcontextprotocol#2322https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322
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