Step-by-step guide: Building a Model Context Protocol server in Python

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Developers can build a Model Context Protocol (MCP) server using an official SDK, with Python and TypeScript being the most mature options available. A minimal working server requires just a few lines of code using the FastMCP high-level API, running over stdio or HTTP transport. The server exposes three core primitives to AI models: tools (callable functions), resources (readable data), and prompts (reusable templates). The current guide targets MCP spec revision 2025-11-25, though a newer revision dated 2026-07-28 that substantially reworks the wire format has also been published. No cloud credentials are needed to build or test locally, and the MCP Inspector tool or Claude Desktop can be used as a client for validation.

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