Version Packages (beta) (#2416)

github-actions[bot] · web-flow · commit 35f6856a17a0 · 2026-07-02T13:26:04.000+01:00
Co-authored-by: github-actions[bot] &lt;41898282+github-actions[bot]@users.noreply.github.com&gt;
diff --git a/.changeset/pre.json b/.changeset/pre.json
@@ -25,6 +25,9 @@
     "@modelcontextprotocol/test-integration": "2.0.0-alpha.1"
   },
   "changesets": [
-    "beta-release"
+    "beta-release",
+    "cjs-support-v2-packages",
+    "codemod-iterations-5",
+    "post-dispatch-32021-http-400"
   ]
 }
diff --git a/packages/client/CHANGELOG.md b/packages/client/CHANGELOG.md
@@ -1,5 +1,16 @@
 # @modelcontextprotocol/client
 
+## 2.0.0-beta.2
+
+### Patch Changes
+
+- [#2405](https://github.com/modelcontextprotocol/typescript-sdk/pull/2405) [`f172626`](https://github.com/modelcontextprotocol/typescript-sdk/commit/f172626a8e98b2ae2f0f690e4afb4dc74dbf6011) Thanks [@mattzcarey](https://github.com/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.
+
 ## 2.0.0-beta.1
 
 ### Patch Changes
diff --git a/packages/client/package.json b/packages/client/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@modelcontextprotocol/client",
-    "version": "2.0.0-beta.1",
+    "version": "2.0.0-beta.2",
     "description": "Model Context Protocol implementation for TypeScript - Client package",
     "license": "MIT",
     "author": "Anthropic, PBC (https://anthropic.com)",
diff --git a/packages/codemod/CHANGELOG.md b/packages/codemod/CHANGELOG.md
@@ -1,5 +1,18 @@
 # @modelcontextprotocol/codemod
 
+## 2.0.0-beta.2
+
+### Patch Changes
+
+- [#2405](https://github.com/modelcontextprotocol/typescript-sdk/pull/2405) [`f172626`](https://github.com/modelcontextprotocol/typescript-sdk/commit/f172626a8e98b2ae2f0f690e4afb4dc74dbf6011) Thanks [@mattzcarey](https://github.com/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.
+
+- [#2412](https://github.com/modelcontextprotocol/typescript-sdk/pull/2412) [`ef120b2`](https://github.com/modelcontextprotocol/typescript-sdk/commit/ef120b2be0c3c3d80468c3d4a9f79be30bb0c0a3) Thanks [@felixweinberger](https://github.com/felixweinberger)! - v1-to-v2 migration fixes from continued real-world migrations (codemod iterations 5).
+
 ## 2.0.0-beta.1
 
 ### Patch Changes
diff --git a/packages/codemod/package.json b/packages/codemod/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@modelcontextprotocol/codemod",
-    "version": "2.0.0-beta.1",
+    "version": "2.0.0-beta.2",
     "description": "Codemod to migrate MCP TypeScript SDK code from v1 to v2",
     "license": "MIT",
     "author": "Anthropic, PBC (https://anthropic.com)",
diff --git a/packages/core-internal/CHANGELOG.md b/packages/core-internal/CHANGELOG.md
@@ -1,5 +1,11 @@
 # @modelcontextprotocol/core-internal
 
+## 2.0.0-beta.1
+
+### Patch Changes
+
+- [#2399](https://github.com/modelcontextprotocol/typescript-sdk/pull/2399) [`3c7ddaf`](https://github.com/modelcontextprotocol/typescript-sdk/commit/3c7ddafa05d8f17fb52168bf4638f09251c3d0ff) Thanks [@felixweinberger](https://github.com/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.
+
 ## 2.0.0-alpha.3
 
 ### Major Changes
diff --git a/packages/core-internal/package.json b/packages/core-internal/package.json
@@ -1,7 +1,7 @@
 {
     "name": "@modelcontextprotocol/core-internal",
     "private": true,
-    "version": "2.0.0-beta.0",
+    "version": "2.0.0-beta.1",
     "description": "Model Context Protocol implementation for TypeScript - Core package",
     "license": "MIT",
     "author": "Anthropic, PBC (https://anthropic.com)",
diff --git a/packages/core/CHANGELOG.md b/packages/core/CHANGELOG.md
@@ -1,5 +1,16 @@
 # @modelcontextprotocol/core
 
+## 2.0.0-beta.2
+
+### Patch Changes
+
+- [#2405](https://github.com/modelcontextprotocol/typescript-sdk/pull/2405) [`f172626`](https://github.com/modelcontextprotocol/typescript-sdk/commit/f172626a8e98b2ae2f0f690e4afb4dc74dbf6011) Thanks [@mattzcarey](https://github.com/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.
+
 ## 2.0.0-beta.1
 
 ### Patch Changes
diff --git a/packages/core/package.json b/packages/core/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@modelcontextprotocol/core",
-    "version": "2.0.0-beta.1",
+    "version": "2.0.0-beta.2",
     "description": "Model Context Protocol for TypeScript — public Zod schemas (spec + OAuth/OpenID)",
     "license": "MIT",
     "author": "Anthropic, PBC (https://anthropic.com)",
diff --git a/packages/middleware/express/CHANGELOG.md b/packages/middleware/express/CHANGELOG.md
@@ -1,5 +1,18 @@
 # @modelcontextprotocol/express
 
+## 2.0.0-beta.2
+
+### Patch Changes
+
+- [#2405](https://github.com/modelcontextprotocol/typescript-sdk/pull/2405) [`f172626`](https://github.com/modelcontextprotocol/typescript-sdk/commit/f172626a8e98b2ae2f0f690e4afb4dc74dbf6011) Thanks [@mattzcarey](https://github.com/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.
+- Updated dependencies [[`f172626`](https://github.com/modelcontextprotocol/typescript-sdk/commit/f172626a8e98b2ae2f0f690e4afb4dc74dbf6011), [`3c7ddaf`](https://github.com/modelcontextprotocol/typescript-sdk/commit/3c7ddafa05d8f17fb52168bf4638f09251c3d0ff)]:
+    - @modelcontextprotocol/server@2.0.0-beta.2
+
 ## 2.0.0-beta.1
 
 ### Patch Changes
diff --git a/packages/middleware/express/package.json b/packages/middleware/express/package.json
@@ -1,7 +1,7 @@
 {
     "name": "@modelcontextprotocol/express",
     "private": false,
-    "version": "2.0.0-beta.1",
+    "version": "2.0.0-beta.2",
     "description": "Express adapters for the Model Context Protocol TypeScript server SDK - Express middleware",
     "license": "MIT",
     "author": "Anthropic, PBC (https://anthropic.com)",
diff --git a/packages/middleware/fastify/CHANGELOG.md b/packages/middleware/fastify/CHANGELOG.md
@@ -1,5 +1,18 @@
 # @modelcontextprotocol/fastify
 
+## 2.0.0-beta.2
+
+### Patch Changes
+
+- [#2405](https://github.com/modelcontextprotocol/typescript-sdk/pull/2405) [`f172626`](https://github.com/modelcontextprotocol/typescript-sdk/commit/f172626a8e98b2ae2f0f690e4afb4dc74dbf6011) Thanks [@mattzcarey](https://github.com/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.
+- Updated dependencies [[`f172626`](https://github.com/modelcontextprotocol/typescript-sdk/commit/f172626a8e98b2ae2f0f690e4afb4dc74dbf6011), [`3c7ddaf`](https://github.com/modelcontextprotocol/typescript-sdk/commit/3c7ddafa05d8f17fb52168bf4638f09251c3d0ff)]:
+    - @modelcontextprotocol/server@2.0.0-beta.2
+
 ## 2.0.0-beta.1
 
 ### Patch Changes
diff --git a/packages/middleware/fastify/package.json b/packages/middleware/fastify/package.json
@@ -1,7 +1,7 @@
 {
     "name": "@modelcontextprotocol/fastify",
     "private": false,
-    "version": "2.0.0-beta.1",
+    "version": "2.0.0-beta.2",
     "description": "Fastify adapters for the Model Context Protocol TypeScript server SDK - Fastify middleware",
     "license": "MIT",
     "author": "Anthropic, PBC (https://anthropic.com)",
diff --git a/packages/middleware/hono/CHANGELOG.md b/packages/middleware/hono/CHANGELOG.md
@@ -1,5 +1,18 @@
 # @modelcontextprotocol/hono
 
+## 2.0.0-beta.2
+
+### Patch Changes
+
+- [#2405](https://github.com/modelcontextprotocol/typescript-sdk/pull/2405) [`f172626`](https://github.com/modelcontextprotocol/typescript-sdk/commit/f172626a8e98b2ae2f0f690e4afb4dc74dbf6011) Thanks [@mattzcarey](https://github.com/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.
+- Updated dependencies [[`f172626`](https://github.com/modelcontextprotocol/typescript-sdk/commit/f172626a8e98b2ae2f0f690e4afb4dc74dbf6011), [`3c7ddaf`](https://github.com/modelcontextprotocol/typescript-sdk/commit/3c7ddafa05d8f17fb52168bf4638f09251c3d0ff)]:
+    - @modelcontextprotocol/server@2.0.0-beta.2
+
 ## 2.0.0-beta.1
 
 ### Patch Changes
diff --git a/packages/middleware/hono/package.json b/packages/middleware/hono/package.json
@@ -1,7 +1,7 @@
 {
     "name": "@modelcontextprotocol/hono",
     "private": false,
-    "version": "2.0.0-beta.1",
+    "version": "2.0.0-beta.2",
     "description": "Hono adapters for the Model Context Protocol TypeScript server SDK - Hono middleware",
     "license": "MIT",
     "author": "Anthropic, PBC (https://anthropic.com)",
diff --git a/packages/middleware/node/CHANGELOG.md b/packages/middleware/node/CHANGELOG.md
@@ -1,5 +1,18 @@
 # @modelcontextprotocol/node
 
+## 2.0.0-beta.2
+
+### Patch Changes
+
+- [#2405](https://github.com/modelcontextprotocol/typescript-sdk/pull/2405) [`f172626`](https://github.com/modelcontextprotocol/typescript-sdk/commit/f172626a8e98b2ae2f0f690e4afb4dc74dbf6011) Thanks [@mattzcarey](https://github.com/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.
+- Updated dependencies [[`f172626`](https://github.com/modelcontextprotocol/typescript-sdk/commit/f172626a8e98b2ae2f0f690e4afb4dc74dbf6011), [`3c7ddaf`](https://github.com/modelcontextprotocol/typescript-sdk/commit/3c7ddafa05d8f17fb52168bf4638f09251c3d0ff)]:
+    - @modelcontextprotocol/server@2.0.0-beta.2
+
 ## 2.0.0-beta.1
 
 ### Patch Changes
diff --git a/packages/middleware/node/package.json b/packages/middleware/node/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@modelcontextprotocol/node",
-    "version": "2.0.0-beta.1",
+    "version": "2.0.0-beta.2",
     "description": "Model Context Protocol implementation for TypeScript - Node.js middleware",
     "license": "MIT",
     "author": "Anthropic, PBC (https://anthropic.com)",
diff --git a/packages/server-legacy/CHANGELOG.md b/packages/server-legacy/CHANGELOG.md
@@ -1,5 +1,16 @@
 # @modelcontextprotocol/server-legacy
 
+## 2.0.0-beta.2
+
+### Patch Changes
+
+- [#2405](https://github.com/modelcontextprotocol/typescript-sdk/pull/2405) [`f172626`](https://github.com/modelcontextprotocol/typescript-sdk/commit/f172626a8e98b2ae2f0f690e4afb4dc74dbf6011) Thanks [@mattzcarey](https://github.com/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.
+
 ## 2.0.0-beta.1
 
 ### Patch Changes
diff --git a/packages/server-legacy/package.json b/packages/server-legacy/package.json
@@ -1,7 +1,7 @@
 {
     "name": "@modelcontextprotocol/server-legacy",
     "private": false,
-    "version": "2.0.0-beta.1",
+    "version": "2.0.0-beta.2",
     "description": "Frozen v1 SSE transport and OAuth Authorization Server helpers for the Model Context Protocol TypeScript SDK. Deprecated; use StreamableHTTP and a dedicated OAuth server in production.",
     "deprecated": "This package is a frozen copy of v1's SSE transport and OAuth Authorization Server helpers for migration purposes only. Use StreamableHTTP from @modelcontextprotocol/server and a dedicated OAuth server in production. Will not receive new features.",
     "license": "MIT",
diff --git a/packages/server/CHANGELOG.md b/packages/server/CHANGELOG.md
@@ -1,5 +1,18 @@
 # @modelcontextprotocol/server
 
+## 2.0.0-beta.2
+
+### Patch Changes
+
+- [#2405](https://github.com/modelcontextprotocol/typescript-sdk/pull/2405) [`f172626`](https://github.com/modelcontextprotocol/typescript-sdk/commit/f172626a8e98b2ae2f0f690e4afb4dc74dbf6011) Thanks [@mattzcarey](https://github.com/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](https://github.com/modelcontextprotocol/typescript-sdk/pull/2399) [`3c7ddaf`](https://github.com/modelcontextprotocol/typescript-sdk/commit/3c7ddafa05d8f17fb52168bf4638f09251c3d0ff) Thanks [@felixweinberger](https://github.com/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.
+
 ## 2.0.0-beta.1
 
 ### Patch Changes
diff --git a/packages/server/package.json b/packages/server/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@modelcontextprotocol/server",
-    "version": "2.0.0-beta.1",
+    "version": "2.0.0-beta.2",
     "description": "Model Context Protocol implementation for TypeScript - Server package",
     "license": "MIT",
     "author": "Anthropic, PBC (https://anthropic.com)",

Original file line number	Diff line number	Diff line change
`@@ -25,6 +25,9 @@`
`25`	`25`	`"@modelcontextprotocol/test-integration": "2.0.0-alpha.1"`
`26`	`26`	`},`
`27`	`27`	`"changesets": [`
`28`		`- "beta-release"`
	`28`	`+ "beta-release",`
	`29`	`+ "cjs-support-v2-packages",`
	`30`	`+ "codemod-iterations-5",`
	`31`	`+ "post-dispatch-32021-http-400"`
`29`	`32`	`]`
`30`	`33`	`}`
Original file line number	Diff line number	Diff line change
`@@ -1,6 +1,6 @@`
`1`	`1`	`{`
`2`	`2`	`"name": "@modelcontextprotocol/client",`
`3`		`- "version": "2.0.0-beta.1",`
	`3`	`+ "version": "2.0.0-beta.2",`
`4`	`4`	`"description": "Model Context Protocol implementation for TypeScript - Client package",`
`5`	`5`	`"license": "MIT",`
`6`	`6`	`"author": "Anthropic, PBC (https://anthropic.com)",`
Original file line number	Diff line number	Diff line change
`@@ -1,6 +1,6 @@`
`1`	`1`	`{`
`2`	`2`	`"name": "@modelcontextprotocol/codemod",`
`3`		`- "version": "2.0.0-beta.1",`
	`3`	`+ "version": "2.0.0-beta.2",`
`4`	`4`	`"description": "Codemod to migrate MCP TypeScript SDK code from v1 to v2",`
`5`	`5`	`"license": "MIT",`
`6`	`6`	`"author": "Anthropic, PBC (https://anthropic.com)",`
Original file line number	Diff line number	Diff line change
`@@ -1,7 +1,7 @@`
`1`	`1`	`{`
`2`	`2`	`"name": "@modelcontextprotocol/core-internal",`
`3`	`3`	`"private": true,`
`4`		`- "version": "2.0.0-beta.0",`
	`4`	`+ "version": "2.0.0-beta.1",`
`5`	`5`	`"description": "Model Context Protocol implementation for TypeScript - Core package",`
`6`	`6`	`"license": "MIT",`
`7`	`7`	`"author": "Anthropic, PBC (https://anthropic.com)",`
Original file line number	Diff line number	Diff line change
`@@ -1,6 +1,6 @@`
`1`	`1`	`{`
`2`	`2`	`"name": "@modelcontextprotocol/core",`
`3`		`- "version": "2.0.0-beta.1",`
	`3`	`+ "version": "2.0.0-beta.2",`
`4`	`4`	`"description": "Model Context Protocol for TypeScript — public Zod schemas (spec + OAuth/OpenID)",`
`5`	`5`	`"license": "MIT",`
`6`	`6`	`"author": "Anthropic, PBC (https://anthropic.com)",`