Pydantic

Typed validation and AI tooling for Python builders

Pydantic is the open-source organization behind Pydantic, the Python data validation library, and PydanticAI, an agent framework for production Python applications. Its tools help developers define typed schemas, validate external data, and keep model inputs and outputs predictable. For AI builders, Pydantic is important because typed validation sits at the boundary between LLM output, APIs, databases, and application code. Teams use it to make structured generation safer, build tool-call schemas, and maintain cleaner data contracts. The project is open source, widely used in the Python ecosystem, and closely associated with FastAPI and modern typed Python development.