typescript-sdk
The official TypeScript SDK for Model Context Protocol servers and clients
Overview
The official TypeScript SDK for implementing Model Context Protocol (MCP), which enables applications to provide standardized context to Large Language Models. MCP separates the concerns of providing context from actual LLM interactions, creating a cleaner architecture for AI applications. This SDK supports building both MCP servers (that provide tools, resources, and prompts) and clients (that consume them), running across Node.js, Bun, and Deno environments. It includes comprehensive libraries for authentication, transport protocols, and streamable HTTP connections. The SDK also provides optional middleware packages for popular frameworks like Express and Hono, making integration straightforward. With over 12,000 GitHub stars, it represents the standard implementation for MCP in the TypeScript ecosystem. Currently, v1.x is recommended for production use while v2 is in pre-alpha development with a stable release planned for Q1 2026.
Pros
- + Official SDK with comprehensive server and client libraries supporting multiple runtimes (Node.js, Bun, Deno)
- + Includes middleware packages for popular frameworks (Express, Hono) enabling easy integration
- + Strong community adoption with 12,000+ GitHub stars and active development
Cons
- - Version 2 is currently in pre-alpha development, making it unstable for production use
- - Requires peer dependency on Zod v4 for schema validation, adding complexity to setup
- - May be over-engineered for simple context provision scenarios that don't need full MCP protocol
Use Cases
- • Building MCP servers that provide tools, resources, and prompts to LLM applications
- • Creating MCP clients that consume standardized context from various servers
- • Integrating MCP capabilities into existing Express or Hono web applications