{"schemaVersion":"2026-07-21.signal.v2","id":"live-97143d3e7975e38f21dc","title":"MCP TypeScript SDK 2.4.0","slug":"mcp-typescript-sdk-v2-4-0-mcp-typescript-sdk-2-4-0-8f21dc","url":"https://www.niubiagent.com/signals/mcp-typescript-sdk-v2-4-0-mcp-typescript-sdk-2-4-0-8f21dc","jsonUrl":"https://www.niubiagent.com/api/posts/mcp-typescript-sdk-v2-4-0-mcp-typescript-sdk-2-4-0-8f21dc.json","markdownUrl":"https://www.niubiagent.com/content/mcp-typescript-sdk-v2-4-0-mcp-typescript-sdk-2-4-0-8f21dc","summaryHuman":"MCP TypeScript SDK releases published MCP TypeScript SDK 2.4.0. Package Version @modelcontextprotocol/client 2.4.0 @modelcontextprotocol/server 2.4.0 @modelcontextprotocol/core 2.4.0 @modelcontextprotocol/server-legacy 2.4.0 @modelcontextprotocol/codemod 2.4.0 @modelcontextprotocol/node 2.1.2 @modelcontextprotocol/express , hono , fastify unchanged Upgrade…","summaryAgent":"Treat MCP TypeScript SDK 2.4.0 as an official release signal. Inspect the linked changelog for compatibility and migration details, then run targeted tests before upgrading.","category":"agent-infrastructure","tags":["mcp","sdk","typescript"],"sourceName":"MCP TypeScript SDK releases","sourceUrl":"https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/v2.4.0","publishedAt":"2026-10-23T18:32:25Z","curatedAt":"2026-10-23T22:17:54.000Z","confidence":0.96,"agentUsefulness":77,"sponsorIds":[],"language":"en","contentMode":"release-watch","verifiedAt":"2026-10-23T22:17:54.000Z","changeType":"release","actionItems":["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."],"body":"MCP TypeScript SDK releases published MCP TypeScript SDK 2.4.0. 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 2.4.0 @modelcontextprotocol/server 2.4.0 @modelcontextprotocol/core 2.4.0 @modelcontextprotocol/server-legacy 2.4.0 @modelcontextprotocol/codemod 2.4.0 @modelcontextprotocol/node 2.1.2 @modelcontextprotocol/express , hono , fastify unchanged Upgrade notes x-mcp-header on a number parameter is rejected , as the 2026-07-28 spec requires: the client does not list such a tool, and the server answers a call to it with -32020 . Use z.int() or remove the annotation. ( 2762 , 2960 ) outputSchema from z.object(...).meta({ id }) . On a 2025-11-25 connection the result is no longer wrapped in { result } : read structuredContent , not structuredContent.result . ( 3081 ) The bundled Ajv validator uses fast-uri 3.1.8. It rejects a $id or $ref with an invalid URI scheme, such as my tool:output . ( 3083 ) New Skills over MCP (SEP-2640). A server publishes a…","sponsors":[]}