MCP TypeScript SDK (official)

The official TypeScript SDK for building MCP servers and clients, maintained by the Model Context Protocol project itself. It is what you use when no server on the list does what you need and you have to wrap an internal API or a client's API. Starting with the official SDK keeps you from getting tied to a third-party implementation when the protocol changes, which still happens often. It requires knowing TypeScript, it is not a configuration tool.