fastmcp

npx skills add majiayu000/claude-skill-registry --skill fastmcp-secondsky-claude-skills-3 --agent claude-code

Same command for any agent — swap --agent for codex, cursor, copilot.

# FastMCP - Build MCP Servers in Python FastMCP is a Python framework for building Model Context Protocol (MCP) servers that expose tools, resources, and prompts to Large Language Models like Claude. ## Quick Start ### Installation ```bash pip install fastmcp # or: uv pip install fastmcp ``` ### Minimal Server ```python from fastmcp import FastMCP # MUST be at module level for FastMCP Cloud mcp = FastMCP("My Server") @mcp.tool() async def hello(name: str) -> str: """Say hello to someone.""" return f"Hello, {name}!" if __name__ == "__main__": mcp.run() ``` **Run:** ```bash python server.py # Local development fastmcp dev server.py # With FastMCP CLI python server.py --transport http --port 8000 # HTTP mode ``` **Copy-Paste Template**: See `templates/basic-server.py` ## Core Concepts ### Tools Functions that LLMs can call: ```python @mcp.tool() def calculate(operation: str, a: float, b: float) -> float: """Perform mathematical operations.""" operations = { "add": lambda x, y: x + y, "subtract": lambda x, y: x - y, "multiply": lambda x, y: x * y, "divide": lambda x, y: x / y if y != 0 else None } return operations.get(operation, lambda x, y: None)(a, b) ``` **Best Practices:** - Clear

pip install fastmcp
python server.py              # Local development
fastmcp dev server.py         # With FastMCP CLI
python server.py --transport http --port 8000  # HTTP mode
fastmcp deploy server.py
fastmcp dev server.py              # Development mode with hot reload
fastmcp run server.py              # Production mode
fastmcp deploy server.py           # Deploy to FastMCP Cloud
fastmcp test server.py             # Run tests