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modelcontextprotocol / python-sdk Public

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Add a pluggable server extension API with MCP Apps - #3003

#3003

Merged

maxisbey merged 14 commits into

mainmodelcontextprotocol/python-sdk:mainfrom

extension-api-sep-2133modelcontextprotocol/python-sdk:extension-api-sep-2133Copy head branch name to clipboard

Jun 29, 2026

Conversation Commits14 (14)Checks Files changed

Merged

Add a pluggable server extension API with MCP Apps#3003
maxisbey merged 14 commits into
mainfrom
extension-api-sep-2133

Commits

Commits on Jun 26, 2026

Surface the SEP-2133 extensions capability map
Kludex
committed
Add the pluggable Extension API to MCPServer
Kludex
committed
Add the MCP Apps extension (io.modelcontextprotocol/ui)
Kludex
committed
Add the Tasks extension (io.modelcontextprotocol/tasks)
Kludex
committed
Add apps and tasks example stories and migration notes
Kludex
committed
Make extensions construction-only and improve the tasks example
Kludex
committed
Clarify Tasks opt-in and per-tool task_support scope
Kludex
committed
Merge remote-tracking branch 'origin/main' into extension-api-sep-2133
Kludex
committed
Drop the Tasks extension; defer to a SEP-2663 rewrite
Kludex
committed
Address extension-API review: layering, enforcement, version gating, Apps fixes
Kludex
committed

Commits on Jun 28, 2026

Address extension review: identifier grammar, additive-only methods, Apps checks
maxisbey
committed
Add extensions and MCP Apps docs, an extensions story, and Apps polish
maxisbey
committed
Bound the client-controlled limit in the extension examples
maxisbey
committed
Back every docs code block with a tested docs_src file
maxisbey
committed

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