Pydantic AI: Build Type-Safe LLM Agents in Python – Real Python

Pydantic AI is a Python framework for building LLM agents that return validated, structured outputs. The tutorial covers installation and setup with Google Gemini, defining Pydantic BaseModel schemas for type-safe structured outputs, registering Python functions as agent tools using @agent.tool decorators, and injecting runtime dependencies (like database connections) with full type safety via RunContext. It also covers practical trade-offs including token costs from validation retries, tool-calling overhead, and varying LLM provider support for structured outputs.