MCP (Model Context Protocol) is an open standard that lets AI agents connect to external tools and data sources. Instead of building a custom integration for every AI client, you build one MCP server, and any compatible client (Claude, Cursor, Windsurf, custom agents) can plug into it.
This guide walks you through building an MCP server from scratch using TypeScript and the official SDK. By the end, you'll have a working server that Claude can connect to and query.
Prerequisites:
Node.js 18+ installed
TypeScript basics






