Version Packages (alpha)

Author: github-actions[bot]

.changeset/pre.json

@@ -42,13 +42,15 @@
     "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",
     "funky-baths-attack",
     "heavy-walls-swim",
     "oauth-error-http200",
+    "odd-forks-enjoy",
     "quick-islands-occur",
     "reconnection-scheduler",
     "remove-websocket-transport",
@@ -63,6 +65,7 @@
     "tender-snails-fold",
     "token-provider-composable-auth",
     "twelve-dodos-taste",
-    "use-scopes-supported-in-dcr"
+    "use-scopes-supported-in-dcr",
+    "zod-json-schema-compat"
   ]
 }

packages/client/CHANGELOG.md

@@ -1,5 +1,15 @@
 # @modelcontextprotocol/client
 
+## 2.0.0-alpha.3
+
+### Patch Changes
+
+- [#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.
+
 ## 2.0.0-alpha.2
 
 ### Patch Changes

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)",

packages/core/CHANGELOG.md

@@ -1,5 +1,12 @@
 # @modelcontextprotocol/core
 
+## 2.0.0-alpha.2
+
+### Patch Changes
+
+- [#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.
+
 ## 2.0.0-alpha.1
 
 ### Minor Changes

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)",

packages/server/CHANGELOG.md

@@ -1,5 +1,12 @@
 # @modelcontextprotocol/server
 
+## 2.0.0-alpha.3
+
+### Patch Changes
+
+- [#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
+
 ## 2.0.0-alpha.2
 
 ### Patch Changes

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)",