Building Your First MCP Server in TypeScript: Give AI Access to Your Data

If you've been in the AI space in 2026, you've heard about MCP. The Model Context Protocol, created by Anthropic and now an open standard, is being called the "USB-C for AI" — a universal way to connect AI models to external tools, data sources, and services. Before MCP, every AI integration was a custom snowflake. Want Claude to query your database? Write a custom tool. Want GPT to search your docs? Build another integration. MCP changes this by providing a standard protocol that any AI host can use to connect to any data source. In this tutorial, we'll build a fully functional MCP server in TypeScript from scratch. What Is MCP and Why Should You Care? MCP follows a client-server architecture: Host : The application the user interacts with (Claude Desktop, VS Code, your custom app) Client : A protocol client inside the host that maintains a 1:1 connection with a server Server : Your code that exposes tools, resources, and prompts to the AI The protocol defines three core primitives: T