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FastMCP 201 Weather Server

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FastMCP 201: from a server that works to a server you can govern

The hands-on for the MCP 201 session (GSA MCP Hackathon, 2026-10-28). One server, four acts, one command per act.

  • server.py: the 101 weather server at the top, unchanged, then four acts that each add one layer to it, narrated in the comments. This is the file on screen.

  • demo.py: uv run python demo.py 1 through 4 plays that act against a live copy of server.py with labeled output, then shuts it down. demo.py proxy and demo.py skill are the optional extras.

  • lab.py: the plumbing behind demo.py (subprocess server, token minting, client calls).

  • weather/keys.py: the demo identity provider's key pair, generated into keys/ on first use.

  • tests/: in-memory tests for every act plus one subprocess smoke test per demo (uv run pytest).

  • setup_client.py, PROMPTS.md: the Claude Code side of the live show, one .mcp.json entry and the talk track per act.

  • skills_server.py, skills/rain-outlook/: the server plus one skill, FastMCP 4.2.0a1 only.

  • RUN.md: the four commands with expected output, and the live Claude Code setup.

Act

Adds

Minutes

I · Who's calling

JWTVerifier, a locally minted token, require_scopes on one tool

12

II · The path, not the prompt

LoggingMiddleware plus a dozen-line redaction middleware; optional ProxyProvider

13

III · Tasks and questions

TasksExtension on memory://, a task=True tool with Progress, an elicitation

14

IV · The agent's head

BM25SearchTransform and CodeMode on two in-process views of the server; optional Skill

12

Versions: fastmcp[tasks,code-mode]==4.1.4 (.venv); fastmcp==4.2.0a1 (.venv-skills) only for the optional skill. Port 8201.

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