SEP-2133: Extensions framework for MCP - #2133
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We should add the extension page outline to this PR.
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This was accepted by @modelcontextprotocol/core-maintainers unanimously: Voting results:
Once comments are addressed, this can be merged and status changed to final. @pja-ant please ensure that SDK's are implementing the necessary changes. |
This was referenced Aug 10, 2026
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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 interoperability, clear governance, and appropriate legal structure.
Key Points
io.modelcontextprotocol/oauth-client-credentials)github.com/modelcontextprotocol/ext-*repositoriesextensionsfield in ClientCapabilities/ServerCapabilitiesDesign Consistency
The patterns described are consistent with existing official extensions (ext-apps and ext-auth).
References