MCP TypeScript SDK 2.3.0

MCP TypeScript SDK releases published MCP TypeScript SDK 2.3.0. This automated release-watch entry was generated from the project's official GitHub release feed and is kept separate from human-reviewed editorial analysis. Release notes: Package Version @modelcontextprotocol/client 2.3.0 @modelcontextprotocol/server 2.3.0 @modelcontextprotocol/core 2.3.0 @modelcontextprotocol/server-legacy 2.3.0 @modelcontextprotocol/codemod 2.3.0 @modelcontextprotocol/node 2.1.1 @modelcontextprotocol/express , hono 2.0.2 @modelcontextprotocol/fastify 2.0.1 Upgrade notes One server per request. Server.connect() now rejects while the instance is already connected, and a stateless Streamable HTTP transport handles one request. Create the McpServer and the transport inside the request handler (or in the createMcpHandler factory) instead of sharing one instance across requests. Creating a server is cheap since 2889 . ( 2918 ) Redirects stay on the same origin. The HTTP client transports now follow a redirect only when it stays on the same origin (same scheme, host and port; http to https on the same host is allowed). A deployment whose…

• Review the official MCP TypeScript SDK releases release notes before upgrading.
• Check compatibility, migration, and security notes against your current agent stack.
• Run focused regression tests before production rollout.