MCP FastMCP Patterns

FastMCP is the "FastAPI of MCP." It simplifies tool and resource registration.

Core Patterns

• Decorators: Using @mcp.tool() and @mcp.resource() for declaration.
• Auto-Schema: FastMCP automatically generates JSON Schema from Python type hints and docstrings.
• Dependency Injection: Managing shared resources (e.g., DB connections) within the server instance.

Workflow

1. Define: Create your server class.
2. Register: Decorate your functions.
3. Run: Start the server using mcp.run().

Best Practices

• Type Safety: Lean on Pydantic models for complex inputs.
• Modularization: Split large servers into multiple files using routers.