Pydantic AI

Pydantic AI is a Python framework for building agents and LLM apps with the same focus on type safety that made Pydantic popular. Outputs are validated against models you define, so you get structured, predictable data back instead of free-form text. It works with many model providers, supports tools and dependency injection, and has good support for testing and debugging. Integration with Pydantic Logfire gives you tracing without much setup. The framework is open source and free. It is a good choice for Python developers who like clean code and strong validation.