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Title: SEP-834: Tools `inputSchema` & `outputSchema` conform to JSON Schema 2020-12 by jpmcb · Pull Request #881 · modelcontextprotocol/modelcontextprotocol · GitHub

Open Graph Title: SEP-834: Tools `inputSchema` & `outputSchema` conform to JSON Schema 2020-12 by jpmcb · Pull Request #881 · modelcontextprotocol/modelcontextprotocol

X Title: SEP-834: Tools `inputSchema` & `outputSchema` conform to JSON Schema 2020-12 by jpmcb · Pull Request #881 · modelcontextprotocol/modelcontextprotocol

Description: Specification and documentation for the Model Context Protocol - SEP-834: Tools `inputSchema` & `outputSchema` conform to JSON Schema 2020-12 by jpmcb · Pull Request #881 · modelcontextprotocol/modelcontextprotocol

Open Graph Description: Motivation and Context TLDR: Loosens inputSchema to be an object with type: object and any additional property to support JSON schema Draft 2020-12 and more powerful validation compositions (like ...

X Description: Motivation and Context TLDR: Loosens inputSchema to be an object with type: object and any additional property to support JSON schema Draft 2020-12 and more powerful validation compositions (like ...

Opengraph URL: https://github.com/modelcontextprotocol/modelcontextprotocol/pull/881

X: @github

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Tool inputSchema and outputSchema do not support JSON Schema typescript-sdk#685https://github.com/modelcontextprotocol/typescript-sdk/issues/685
Support JSON Schema allOf, oneOf, etc. inspector#496https://github.com/modelcontextprotocol/inspector/issues/496
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8afdce3https://github.com/modelcontextprotocol/modelcontextprotocol/commit/8afdce3b00be94adc26724ec572e3b6eee713298
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Compare https://github.com/modelcontextprotocol/modelcontextprotocol/compare/8afdce3b00be94adc26724ec572e3b6eee713298..0b1c2b5ae902595e66e75a591347fdab2d587721
September 25, 2025 15:01https://github.com/modelcontextprotocol/modelcontextprotocol/pull/881#event-19922586682
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Oct 6, 2025 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/881#ref-issue-3487919219
SEP-1613: Establish JSON Schema 2020-12 as Default Dialect for MCP #1613 https://github.com/modelcontextprotocol/modelcontextprotocol/issues/1613
https://github.com/lawrencepit
lawrencepithttps://github.com/lawrencepit
Oct 25, 2025 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/881#ref-issue-3551580247
Output schema type array modelcontextprotocol/ruby-sdk#170 https://github.com/modelcontextprotocol/ruby-sdk/issues/170
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Oct 29, 2025https://github.com/modelcontextprotocol/modelcontextprotocol/pull/881#issuecomment-3461888564
Make schema object compatible with JSON Schema draft4 OAI/OpenAPI-Specification#333https://github.com/OAI/OpenAPI-Specification/issues/333
JSON Schema for the OpenAPI 3.0 Specification OAI/OpenAPI-Specification#1032https://github.com/OAI/OpenAPI-Specification/issues/1032
https://www.openapis.org/blog/2021/02/18/openapi-specification-3-1-releasedhttps://www.openapis.org/blog/2021/02/18/openapi-specification-3-1-released
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Nov 12, 2025https://github.com/modelcontextprotocol/modelcontextprotocol/pull/881#issuecomment-3522008863
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SEP-1613https://github.com/modelcontextprotocol/modelcontextprotocol/pull/881#1613
list of accepted SEPs for the 2025-11-25 spec versionhttps://github.com/orgs/modelcontextprotocol/projects/26/views/8
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November 25, 2025 19:37https://github.com/modelcontextprotocol/modelcontextprotocol/pull/881#event-21172647010
https://github.com/dsp-ant
dsp-anthttps://github.com/dsp-ant
SEP https://github.com/modelcontextprotocol/modelcontextprotocol/issues?q=state%3Aopen%20label%3ASEP
proposal https://github.com/modelcontextprotocol/modelcontextprotocol/issues?q=state%3Aopen%20label%3Aproposal
Jan 14, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/881#event-22051688292
https://github.com/olaservo
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Jan 17, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/881#ref-pullrequest-3825897254
SEP-2106: Tools inputSchema & outputSchema Conform to JSON Schema 2020-12 #2106 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2106
olaservohttps://github.com/olaservo
Jan 17, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/881#ref-commit-9cfcdf9
https://github.com/olaservo
https://github.com/jpmcb
https://github.com/claude
Align SEP with John's original PRhttps://github.com/olaservo/modelcontextprotocol/commit/9cfcdf9790ca879c00c253a6af9a4541b2f37f9d
modelcontextprotocol#881https://github.com/modelcontextprotocol/modelcontextprotocol/pull/881
intenthttps://github.com/olaservo/modelcontextprotocol/commit/9cfcdf9790ca879c00c253a6af9a4541b2f37f9d
9cfcdf9https://github.com/olaservo/modelcontextprotocol/commit/9cfcdf9790ca879c00c253a6af9a4541b2f37f9d
olaservohttps://github.com/olaservo
Jan 17, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/881#ref-commit-acdad08
https://github.com/olaservo
https://github.com/jpmcb
https://github.com/claude
Fix inputSchema to require type: "object" per original intenthttps://github.com/olaservo/modelcontextprotocol/commit/acdad08ecbcc24ea7d784847fa538e61ac03b941
acdad08https://github.com/olaservo/modelcontextprotocol/commit/acdad08ecbcc24ea7d784847fa538e61ac03b941
modelcontextprotocol#881https://github.com/modelcontextprotocol/modelcontextprotocol/pull/881
https://github.com/localden
localdenhttps://github.com/localden
SEP Review Pipelinehttps://github.com/orgs/modelcontextprotocol/projects/12
Jan 21, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/881#event-22180520608
https://github.com/localden
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@olaservohttps://github.com/olaservo
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Jan 21, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/881#event-22197700098
https://github.com/localden
localdenhttps://github.com/localden
SEP Review Pipelinehttps://github.com/orgs/modelcontextprotocol/projects/12
Jan 28, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/881#event-22358840995
https://github.com/apps/github-actions
github-actionshttps://github.com/apps/github-actions
Jan 29, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/881#ref-issue-3871743950
[in-review] SEP-834: SEP-834 Support full JSON Schema 2020-12 joshrotenberg/tower-mcp#253 https://github.com/joshrotenberg/tower-mcp/issues/253
https://github.com/apps/github-actions
github-actionshttps://github.com/apps/github-actions
Mar 9, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/881#ref-issue-4044418225
[in-review] SEP-834: Support full JSON Schema 2020-12 joshrotenberg/tower-mcp#697 https://github.com/joshrotenberg/tower-mcp/issues/697
olaservohttps://github.com/olaservo
May 6, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/881#ref-commit-9e878c0
https://github.com/olaservo
Distinguish original author from current shepherd in SEP-2106https://github.com/olaservo/modelcontextprotocol/commit/9e878c0ef3e3ac71f54c95242c11b61a30b09778
9e878c0https://github.com/olaservo/modelcontextprotocol/commit/9e878c0ef3e3ac71f54c95242c11b61a30b09778
@jpmcbhttps://github.com/jpmcb
modelcontextprotocol#881https://github.com/modelcontextprotocol/modelcontextprotocol/pull/881
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mcp-commanderhttps://github.com/apps/mcp-commander
May 18, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/881#ref-commit-142b3c3
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https://github.com/jpmcb
https://github.com/claude
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SEP-2106: Tools inputSchema & outputSchema Conform to JSON Schema…https://github.com/modelcontextprotocol/modelcontextprotocol/commit/142b3c3cffcd10012e3dc1b07db5818877e64f9b
142b3c3https://github.com/modelcontextprotocol/modelcontextprotocol/commit/142b3c3cffcd10012e3dc1b07db5818877e64f9b
#2106https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2106
#834https://github.com/modelcontextprotocol/modelcontextprotocol/issues/834
#834https://github.com/modelcontextprotocol/modelcontextprotocol/issues/834
#2106https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2106
#881https://github.com/modelcontextprotocol/modelcontextprotocol/pull/881
#881https://github.com/modelcontextprotocol/modelcontextprotocol/pull/881
#1906https://github.com/modelcontextprotocol/modelcontextprotocol/issues/1906
#1149https://github.com/modelcontextprotocol/modelcontextprotocol/discussions/1149
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#881https://github.com/modelcontextprotocol/modelcontextprotocol/pull/881
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https://github.com/apps/coderabbitai
coderabbitaihttps://github.com/apps/coderabbitai
Jun 6, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/881#ref-pullrequest-4603531059
Advertise MCP bounty list output schema ramimbo/mergework#1017 https://github.com/ramimbo/mergework/pull/1017
https://github.com/apps/coderabbitai
coderabbitaihttps://github.com/apps/coderabbitai
Jul 3, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/881#ref-pullrequest-4803887041
Stabilize memory context output (roadmap Sprint 1) besfeng23/Memory#123 https://github.com/besfeng23/Memory/pull/123
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https://github.com/modelcontextprotocol/modelcontextprotocol/pull/881/files/6164798f8efff21775978e652cb8b64400ae4151
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SEP https://github.com/modelcontextprotocol/modelcontextprotocol/issues?q=state%3Aopen%20label%3ASEP
SEP-834 Support full JSON Schema 2020-12 https://github.com/modelcontextprotocol/modelcontextprotocol/issues/834
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