MCP Apps 2.0 adopts split MCP TypeScript SDK packages while preserving wire compatibility
MCP Apps 2.0 moves to split MCP TypeScript SDK 2.0 client and server packages, Zod 4.2 and Node.js 20 while keeping 1.x and 2.x Views and hosts interoperable on the wire.
Event Source published Indexed Verified
Why it matters
The release demonstrates that an interactive UI extension can evolve developer APIs without immediately breaking deployed hosts and views.
A closer look
Breaking changes affect dependencies, handler context, registration APIs and error types. A migration guide and cross-version tests accompany schema updates aligned with MCP 2.0 core types.
Who this is for
MCP Apps View, host and TypeScript service developers
Original sources
Revisions & corrections (1)
— Historical 90-day catch-up found the official 2.0 release absent from the catalog. Signed release notes, date, interoperability scope and caveats were read.