Iron Law

NO FASTAPI ENDPOINT WITHOUT A PYDANTIC v2 INPUT MODEL — never trust raw request data; validate at the boundary, always

Python 3.14 Development Skill

Code Conventions

• Use Python 3.14 with type hints everywhere
• FastAPI for REST APIs, Pydantic v2 for validation
• Async by default: async def endpoints, asyncpg for PostgreSQL
• Use uv for package management, ruff for linting, mypy for types
• Folder structure: api/routes/ → services/ → repositories/ → models/
• Tests: pytest + pytest-asyncio + httpx

Quick Scaffold — New Python Project