MCP Explained

What is MCP? An open standard for connecting AI apps to the tools and data they use. A server says what it can do, the app shows that to the model, and when the model wants something the app calls the server and hands the result back. Host the AI app you use: Claude, Cursor, ChatGPT, an agent Server a small program exposing tools, data or prompts Model decides what to use; never talks to a server directly Not REST JSON-RPC over stdin/stdout or one HTTP endpoint, and servers can talk back Not just JSON-RPC JSON-RPC is the envelope. MCP defines what goes in it: the methods, capability negotiation, transports and auth or jump to Tools · the spec time machine · Break it Spec # From To Method Info