modelcontextprotocol/typescript-sdk @modelcontextprotocol/server@2.0.0-beta.2

on GitHub

Patch Changes

• #2405 f172626 Thanks @mattzcarey! - Ship CommonJS builds alongside ESM. Each package now emits both .mjs/.d.mts
  and .cjs/.d.cts (via tsdown format: ['esm', 'cjs']), and its exports map
  adds a require condition so require('@modelcontextprotocol/…') works from
  CommonJS consumers. Output extensions are normalized across all packages
  (@modelcontextprotocol/core moves from .js/.d.ts to .mjs/.d.mts); the
  public import paths are unchanged.

• #2399 3c7ddaf Thanks @felixweinberger! - Return HTTP 400 for a MissingRequiredClientCapabilityError (-32021) produced after dispatch. The spec mandates 400 Bad Request for this error with no condition on where it arose, but only the pre-dispatch capability gate honored that; the post-handler emission — the input_required gate rejecting an embedded request whose required capability the caller did not declare — surfaced in-band on HTTP 200. The JSON-RPC error body is unchanged, every other error code (including a handler relaying a downstream peer's -32020/-32022) keeps the origin-keyed in-band behavior, and the mapping only applies while the response is uncommitted: an exchange that already streamed — or one hosted with responseMode: 'sse', which opens its stream at dispatch end — keeps its committed 200 and carries the error in-stream.