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Title: SEP-2133: Extensions framework for MCP by pja-ant · Pull Request #2133 · modelcontextprotocol/modelcontextprotocol · GitHub

Open Graph Title: SEP-2133: Extensions framework for MCP by pja-ant · Pull Request #2133 · modelcontextprotocol/modelcontextprotocol

X Title: SEP-2133: Extensions framework for MCP by pja-ant · Pull Request #2133 · modelcontextprotocol/modelcontextprotocol

Description: Specification and documentation for the Model Context Protocol - SEP-2133: Extensions framework for MCP by pja-ant · Pull Request #2133 · modelcontextprotocol/modelcontextprotocol

Open Graph Description: This SEP ports the Extensions proposal from issue #1724 to the new PR-based SEP format (per SEP-1850). Summary Establishes a framework for extending the Model Context Protocol while maintaining int...

X Description: This SEP ports the Extensions proposal from issue #1724 to the new PR-based SEP format (per SEP-1850). Summary Establishes a framework for extending the Model Context Protocol while maintaining int...

Opengraph URL: https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2133

X: @github

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Domain: github.com

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pja-anthttps://github.com/pja-ant
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accepted https://github.com/modelcontextprotocol/modelcontextprotocol/issues?q=state%3Aopen%20label%3Aaccepted
Jan 27, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2133#event-22303939305
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felixweinbergerhttps://github.com/felixweinberger
Jan 29, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2133#ref-pullrequest-3857670716
v2 draft - RFC on features refactor modelcontextprotocol/typescript-sdk#1426 https://github.com/modelcontextprotocol/typescript-sdk/pull/1426
Implement SEP-1724: Extensions modelcontextprotocol/typescript-sdk#1063 https://github.com/modelcontextprotocol/typescript-sdk/issues/1063
Add extensions modelcontextprotocol/typescript-sdk#1475 https://github.com/modelcontextprotocol/typescript-sdk/pull/1475
https://github.com/vinoo999
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Feb 10, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2133#ref-issue-3919776365
[Feat]: Extension Governance Framework for A2A a2aproject/A2A#1464 https://github.com/a2aproject/A2A/issues/1464
Add Extensions support to ClientCapabilities and ServerCapabilities (SEP-2133) modelcontextprotocol/csharp-sdk#1292 https://github.com/modelcontextprotocol/csharp-sdk/pull/1292
Add Extensions support to ClientCapabilities and ServerCapabilities modelcontextprotocol/csharp-sdk#1317 https://github.com/modelcontextprotocol/csharp-sdk/pull/1317
https://github.com/omar-scio
omar-sciohttps://github.com/omar-scio
Mar 13, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2133#ref-pullrequest-4073727366
add support for extensions in ClientCapabilities and ServerCapabilities mark3labs/mcp-go#749 https://github.com/mark3labs/mcp-go/pull/749
https://github.com/apps/mcp-virtual-tpm
mcp-virtual-tpmhttps://github.com/apps/mcp-virtual-tpm
2026-06-30-RChttps://github.com/modelcontextprotocol/modelcontextprotocol/milestone/4
Apr 17, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2133#event-24620935864
https://github.com/mikekistler
mikekistlerhttps://github.com/mikekistler
Apr 30, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2133#ref-issue-4354468114
2026-07-28 Spec Compliance modelcontextprotocol/csharp-sdk#1539 https://github.com/modelcontextprotocol/csharp-sdk/issues/1539
[2026-07-28] Extensions framework + Tasks + MCP Apps modelcontextprotocol/php-sdk#335 https://github.com/modelcontextprotocol/php-sdk/issues/335
[Schema][Server][Client] SEP-2133: Extensions framework (capability negotiation + ExtensionRegistry + extensible dispatch) modelcontextprotocol/php-sdk#344 https://github.com/modelcontextprotocol/php-sdk/issues/344
https://github.com/felixweinberger
felixweinbergerhttps://github.com/felixweinberger
May 29, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2133#ref-issue-4547536490
Implement SEP-2133: Extensions framework for MCP modelcontextprotocol/typescript-sdk#2188 https://github.com/modelcontextprotocol/typescript-sdk/issues/2188
https://github.com/SamMorrowDrums
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Jun 1, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2133#ref-pullrequest-4527314399
SEP-2792: Internationalization via Per-Request Language Negotiation #2792 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2792
https://github.com/localden
localdenhttps://github.com/localden
2026-07-28 Spec Implementationhttps://github.com/orgs/modelcontextprotocol/projects/41
Jun 6, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2133#event-26416908975
https://github.com/apps/github-project-automation
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2026-07-28 Spec Implementationhttps://github.com/orgs/modelcontextprotocol/projects/41
Jun 6, 2026https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2133#event-26416909100
SEP-2133: Extensions framework for MCP modelcontextprotocol/csharp-sdk#1631 https://github.com/modelcontextprotocol/csharp-sdk/issues/1631
Implement SEP-2133: Extensions framework for MCP modelcontextprotocol/go-sdk#991 https://github.com/modelcontextprotocol/go-sdk/issues/991
Implement SEP-2133: Extensions framework for MCP modelcontextprotocol/rust-sdk#892 https://github.com/modelcontextprotocol/rust-sdk/issues/892
Implement SEP-2133: Extensions framework for MCP modelcontextprotocol/kotlin-sdk#804 https://github.com/modelcontextprotocol/kotlin-sdk/issues/804
Implement SEP-2133: Extensions framework for MCP modelcontextprotocol/python-sdk#2793 https://github.com/modelcontextprotocol/python-sdk/issues/2793
SEP-2133: Extensions framework for MCP modelcontextprotocol/ruby-sdk#378 https://github.com/modelcontextprotocol/ruby-sdk/issues/378
Implement SEP-2133: Extensions framework for MCP modelcontextprotocol/swift-sdk#234 https://github.com/modelcontextprotocol/swift-sdk/issues/234
(implementation): SEP-2133 - Extensions framework for MCP #2872 https://github.com/modelcontextprotocol/modelcontextprotocol/issues/2872
https://github.com/koic
koichttps://github.com/koic
Jun 14, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2133#ref-pullrequest-4658427010
Support Capability Extensions per SEP-2133 modelcontextprotocol/ruby-sdk#405 https://github.com/modelcontextprotocol/ruby-sdk/pull/405
koichttps://github.com/koic
Jun 14, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2133#ref-commit-2c62139
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modelcontextprotocol/modelcontextprotocol#2133https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2133
#378https://github.com/modelcontextprotocol/ruby-sdk/issues/378
https://github.com/maxisbey
maxisbeyhttps://github.com/maxisbey
Jun 17, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2133#ref-issue-4682674253
Capabilities API + server/discover handler modelcontextprotocol/python-sdk#2896 https://github.com/modelcontextprotocol/python-sdk/issues/2896
https://github.com/JoseBueno-plytix
JoseBueno-plytixhttps://github.com/JoseBueno-plytix
Jun 20, 2026 https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2133#ref-issue-4602775110
Implement SEP-2663: Tasks Extension modelcontextprotocol/python-sdk#2806 https://github.com/modelcontextprotocol/python-sdk/issues/2806
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2026-07-28 Spec Implementation https://github.com/orgs/modelcontextprotocol/projects/41
SEP Review Pipeline https://github.com/orgs/modelcontextprotocol/projects/12
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