Build a Python MCP Server and Connect It to Claude Code
The tutorial builds a Python MCP server that exposes local tools to Claude Code over stdio. It explains MCP, covers an Intel Mac installation workaround, and replaces the older FastMCP import with MCPServer.
The walkthrough defines tools with decorators, docstrings, and type hints, tests them with the SDK client, and connects the server to Claude Code. A local model invents RSS feed addresses, so the revised tool fixes the address in code and returns the requested posts.
The tutorial also covers file-access guards, ToolError responses, and logging to standard error. It closes with server permissions, tool poisoning, and the risks of untrusted packages and web content.
Key points
- MCP lets AI apps access external tools and data, while stdio runs the server as a local program.
- The setup addresses an Intel Mac dependency issue and the SDK change from FastMCP to MCPServer.
- Decorated Python functions define tools, with path checks, ToolError responses, and limits on RSS input.
- The SDK client tests the tools before the server is registered with Claude Code.
- Fixing the RSS feed address in code prevents the model from inventing URLs and produces a successful result.
- MCP servers run with the user's permissions, and tool descriptions or fetched content can carry malicious instructions.
Chapters
The description and key points were written with AI from the video's transcript and checked against it, then reviewed by Vishal on . The video plays from YouTube. How we write and check our work.
