Pydantic AI Agent Builder Purpose Create production-ready AI agents with type safety, automatic validation, and minimal boilerplate using Pydantic AI framework. When to Use - Building FastAPI backend with AI capabilities - Need strict type checking and validation - Want auto-retry on malformed LLM responses - Creating agents with custom tools Architecture Pattern Project Structure Installation Base Agent Pattern Integration with OpenRouter Setup Environment Variables Tool Definition Pattern Streaming Pattern Error Handling & Retry FastAPI Integration Testing Pattern Best Practices 1. Type Saf…