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8/2/2026
How to build an MCP server, step by step

How to build an MCP server, step by step

Short summary

A practical step-by-step guide to building an MCP server using the Python SDK with FastMCP. Covers installing the SDK, declaring typed tools, exposing resources and prompts via URIs, and testing with Claude Desktop or the MCP Inspector. Targets MCP revision 2025-11-25 with notes on the upcoming 2026-07-28 wire-format changes.

  • •Install MCP Python SDK and create a minimal FastMCP server over stdio
  • •Declare tools with typed inputs, resources via URIs, and reusable prompt templates
  • •Test with Claude Desktop or MCP Inspector; plan migration to spec revision 2026-07-28

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