Version Packages (alpha)

github-actions[bot] · github-actions[bot] · commit 73d66f4c1223 · 2026-04-28T12:40:50.000Z
diff --git a/.changeset/pre.json b/.changeset/pre.json
@@ -29,26 +29,32 @@
     "brave-lions-glow",
     "busy-rice-smoke",
     "busy-weeks-hang",
+    "cfworker-out-of-barrel",
     "cyan-cycles-pump",
     "drop-zod-peer-dep",
+    "export-inmemory-transport",
     "expose-auth-server-discovery",
     "extract-task-manager",
     "fast-dragons-lead",
     "finish-sdkerror-capability",
     "fix-abort-listener-leak",
+    "fix-failed-task-result-retrieval",
     "fix-oauth-5xx-discovery",
     "fix-onerror-callbacks",
     "fix-server-protocol-version",
     "fix-session-status-codes",
     "fix-stdio-epipe-crash",
     "fix-stdio-windows-hide",
+    "fix-streamable-close-reentrant",
     "fix-streamable-http-error-response",
     "fix-task-session-isolation",
     "fix-transport-exact-optional-property-types",
     "fix-unknown-tool-protocol-error",
+    "fix-validate-client-metadata-url",
     "funky-baths-attack",
     "heavy-walls-swim",
     "oauth-error-http200",
+    "odd-forks-enjoy",
     "quick-islands-occur",
     "reconnection-scheduler",
     "remove-websocket-transport",
@@ -63,6 +69,8 @@
     "tender-snails-fold",
     "token-provider-composable-auth",
     "twelve-dodos-taste",
-    "use-scopes-supported-in-dcr"
+    "use-scopes-supported-in-dcr",
+    "zod-json-schema-compat",
+    "zod-jsonschema-fallback"
   ]
 }
diff --git a/packages/client/CHANGELOG.md b/packages/client/CHANGELOG.md
@@ -1,5 +1,34 @@
 # @modelcontextprotocol/client
 
+## 2.0.0-alpha.3
+
+### Minor Changes
+
+- [#1653](https://github.com/modelcontextprotocol/typescript-sdk/pull/1653) [`6bec24a`](https://github.com/modelcontextprotocol/typescript-sdk/commit/6bec24a14cb7e3dbe9f5e04aeb893cd0d6e8cb83) Thanks [@rechedev9](https://github.com/rechedev9)! - Add `validateClientMetadataUrl()`
+  utility for early validation of `clientMetadataUrl`
+
+    Exports a `validateClientMetadataUrl()` function that `OAuthClientProvider` implementations can call in their constructors to fail fast on invalid URL-based client IDs, instead of discovering the error deep in the auth flow.
+
+### Patch Changes
+
+- [#1897](https://github.com/modelcontextprotocol/typescript-sdk/pull/1897) [`434b2f1`](https://github.com/modelcontextprotocol/typescript-sdk/commit/434b2f11ecec452f3dca0199f68afccd8b119dd4) Thanks [@felixweinberger](https://github.com/felixweinberger)! - Stop bundling
+  `@cfworker/json-schema` into the main package barrel. Previously `CfWorkerJsonSchemaValidator` was re-exported from the core internal barrel, so tsdown inlined the `@cfworker/json-schema` dev dependency into every consumer's bundle even when it was never used. The validator is
+  now reachable only via the `_shims` conditional (workerd/browser) and the explicit `@modelcontextprotocol/{server,client}/validators/cf-worker` subpath, so consumers that don't opt into it no longer ship that code. No public API change.
+
+- [#1834](https://github.com/modelcontextprotocol/typescript-sdk/pull/1834) [`42cb6b2`](https://github.com/modelcontextprotocol/typescript-sdk/commit/42cb6b2b728347d8b58a0d1940b7e63366a29ab9) Thanks [@felixweinberger](https://github.com/felixweinberger)! - Export
+  `InMemoryTransport` for in-process testing.
+
+- [#1655](https://github.com/modelcontextprotocol/typescript-sdk/pull/1655) [`1eb3123`](https://github.com/modelcontextprotocol/typescript-sdk/commit/1eb31236e707c4f4ab9234d87db21ab3f34bf0bc) Thanks [@nielskaspers](https://github.com/nielskaspers)! - fix(client): append custom
+  Accept headers to spec-required defaults in StreamableHTTPClientTransport
+
+    Custom Accept headers provided via `requestInit.headers` are now appended to the spec-mandated Accept types instead of being overwritten. This ensures the required media types (`application/json, text/event-stream` for POST; `text/event-stream` for GET SSE) are always present
+    while allowing users to include additional types for proxy/gateway routing.
+
+- [#1895](https://github.com/modelcontextprotocol/typescript-sdk/pull/1895) [`b256546`](https://github.com/modelcontextprotocol/typescript-sdk/commit/b256546750277faeb7c886792aae5ed26e6904d5) Thanks [@felixweinberger](https://github.com/felixweinberger)! - Fix runtime crash on
+  `tools/list` when a tool's `inputSchema` comes from zod 4.0–4.1. The SDK requires `~standard.jsonSchema` (StandardJSONSchemaV1, added in zod 4.2.0); previously a missing `jsonSchema` crashed at `undefined[io]`. `standardSchemaToJsonSchema` now detects zod 4 schemas lacking
+  `jsonSchema` and falls back to the SDK-bundled `z.toJSONSchema()`, emitting a one-time console warning. zod 3 schemas (which the bundled zod 4 converter cannot introspect) and non-zod schema libraries without `jsonSchema` get a clear error pointing to `fromJsonSchema()`. The
+  workspace zod catalog is also bumped to `^4.2.0`.
+
 ## 2.0.0-alpha.2
 
 ### 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-alpha.2",
+    "version": "2.0.0-alpha.3",
     "description": "Model Context Protocol implementation for TypeScript - Client package",
     "license": "MIT",
     "author": "Anthropic, PBC (https://anthropic.com)",
diff --git a/packages/core/CHANGELOG.md b/packages/core/CHANGELOG.md
@@ -1,5 +1,20 @@
 # @modelcontextprotocol/core
 
+## 2.0.0-alpha.2
+
+### Patch Changes
+
+- [#1930](https://github.com/modelcontextprotocol/typescript-sdk/pull/1930) [`bdfd7f0`](https://github.com/modelcontextprotocol/typescript-sdk/commit/bdfd7f0154e2afd4fd6d2e95e6aadd924c3775f2) Thanks [@Christian-Sidak](https://github.com/Christian-Sidak)! - Fix `requestStream` to
+  call `tasks/result` for failed tasks instead of yielding a hardcoded `ProtocolError`. When a task reaches the `failed` terminal status, the stream now retrieves and yields the actual stored result (matching the behavior for `completed` tasks), as required by the spec.
+
+- [#1768](https://github.com/modelcontextprotocol/typescript-sdk/pull/1768) [`866c08d`](https://github.com/modelcontextprotocol/typescript-sdk/commit/866c08d3640c5213f80c3b4220e24c42acfc2db8) Thanks [@felixweinberger](https://github.com/felixweinberger)! - Allow additional JSON
+  Schema properties in elicitInput's requestedSchema type by adding .catchall(z.unknown()), matching the pattern used by inputSchema. This fixes type incompatibility when using Zod v4's .toJSONSchema() output which includes extra properties like $schema and additionalProperties.
+
+- [#1895](https://github.com/modelcontextprotocol/typescript-sdk/pull/1895) [`b256546`](https://github.com/modelcontextprotocol/typescript-sdk/commit/b256546750277faeb7c886792aae5ed26e6904d5) Thanks [@felixweinberger](https://github.com/felixweinberger)! - Fix runtime crash on
+  `tools/list` when a tool's `inputSchema` comes from zod 4.0–4.1. The SDK requires `~standard.jsonSchema` (StandardJSONSchemaV1, added in zod 4.2.0); previously a missing `jsonSchema` crashed at `undefined[io]`. `standardSchemaToJsonSchema` now detects zod 4 schemas lacking
+  `jsonSchema` and falls back to the SDK-bundled `z.toJSONSchema()`, emitting a one-time console warning. zod 3 schemas (which the bundled zod 4 converter cannot introspect) and non-zod schema libraries without `jsonSchema` get a clear error pointing to `fromJsonSchema()`. The
+  workspace zod catalog is also bumped to `^4.2.0`.
+
 ## 2.0.0-alpha.1
 
 ### Minor Changes
diff --git a/packages/core/package.json b/packages/core/package.json
@@ -1,7 +1,7 @@
 {
     "name": "@modelcontextprotocol/core",
     "private": true,
-    "version": "2.0.0-alpha.1",
+    "version": "2.0.0-alpha.2",
     "description": "Model Context Protocol implementation for TypeScript - Core package",
     "license": "MIT",
     "author": "Anthropic, PBC (https://anthropic.com)",
diff --git a/packages/server/CHANGELOG.md b/packages/server/CHANGELOG.md
@@ -1,5 +1,24 @@
 # @modelcontextprotocol/server
 
+## 2.0.0-alpha.3
+
+### Patch Changes
+
+- [#1897](https://github.com/modelcontextprotocol/typescript-sdk/pull/1897) [`434b2f1`](https://github.com/modelcontextprotocol/typescript-sdk/commit/434b2f11ecec452f3dca0199f68afccd8b119dd4) Thanks [@felixweinberger](https://github.com/felixweinberger)! - Stop bundling
+  `@cfworker/json-schema` into the main package barrel. Previously `CfWorkerJsonSchemaValidator` was re-exported from the core internal barrel, so tsdown inlined the `@cfworker/json-schema` dev dependency into every consumer's bundle even when it was never used. The validator is
+  now reachable only via the `_shims` conditional (workerd/browser) and the explicit `@modelcontextprotocol/{server,client}/validators/cf-worker` subpath, so consumers that don't opt into it no longer ship that code. No public API change.
+
+- [#1834](https://github.com/modelcontextprotocol/typescript-sdk/pull/1834) [`42cb6b2`](https://github.com/modelcontextprotocol/typescript-sdk/commit/42cb6b2b728347d8b58a0d1940b7e63366a29ab9) Thanks [@felixweinberger](https://github.com/felixweinberger)! - Export
+  `InMemoryTransport` for in-process testing.
+
+- [#1788](https://github.com/modelcontextprotocol/typescript-sdk/pull/1788) [`df4b6cc`](https://github.com/modelcontextprotocol/typescript-sdk/commit/df4b6cc88d6f24fc857519cf506a7a039f532637) Thanks [@claygeo](https://github.com/claygeo)! - Prevent stack overflow in
+  StreamableHTTPServerTransport.close() with re-entrant guard
+
+- [#1895](https://github.com/modelcontextprotocol/typescript-sdk/pull/1895) [`b256546`](https://github.com/modelcontextprotocol/typescript-sdk/commit/b256546750277faeb7c886792aae5ed26e6904d5) Thanks [@felixweinberger](https://github.com/felixweinberger)! - Fix runtime crash on
+  `tools/list` when a tool's `inputSchema` comes from zod 4.0–4.1. The SDK requires `~standard.jsonSchema` (StandardJSONSchemaV1, added in zod 4.2.0); previously a missing `jsonSchema` crashed at `undefined[io]`. `standardSchemaToJsonSchema` now detects zod 4 schemas lacking
+  `jsonSchema` and falls back to the SDK-bundled `z.toJSONSchema()`, emitting a one-time console warning. zod 3 schemas (which the bundled zod 4 converter cannot introspect) and non-zod schema libraries without `jsonSchema` get a clear error pointing to `fromJsonSchema()`. The
+  workspace zod catalog is also bumped to `^4.2.0`.
+
 ## 2.0.0-alpha.2
 
 ### 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-alpha.2",
+    "version": "2.0.0-alpha.3",
     "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
`@@ -1,6 +1,6 @@`
`1`	`1`	`{`
`2`	`2`	`"name": "@modelcontextprotocol/client",`
`3`		`- "version": "2.0.0-alpha.2",`
	`3`	`+ "version": "2.0.0-alpha.3",`
`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
`@@ -1,7 +1,7 @@`
`1`	`1`	`{`
`2`	`2`	`"name": "@modelcontextprotocol/core",`
`3`	`3`	`"private": true,`
`4`		`- "version": "2.0.0-alpha.1",`
	`4`	`+ "version": "2.0.0-alpha.2",`
`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/server",`
`3`		`- "version": "2.0.0-alpha.2",`
	`3`	`+ "version": "2.0.0-alpha.3",`
`4`	`4`	`"description": "Model Context Protocol implementation for TypeScript - Server package",`
`5`	`5`	`"license": "MIT",`
`6`	`6`	`"author": "Anthropic, PBC (https://anthropic.com)",`