Pydantic AI
Type-safe agent framework for Python with structured output validation.
Open source
Best for Python backend teams that want schema-aware agents where tool parameters, structured outputs, and model responses are validated at runtime against Pydantic models.
Official resources
Selection advice
Choose Pydantic AI when type safety and structured output are non-negotiable — the framework validates model responses against Pydantic schemas before the agent acts on them.
Best for
- type-safe agents
- structured output
- Python backend teams
- schema validation
Not ideal for
- TypeScript/JS teams
- projects that don't need strict schema enforcement
Core concepts
type safetystructured outputschema validationtool parameters
Minimal implementation shape
Define tool parameters and agent responses as Pydantic models, let the agent call tools with validated arguments, and receive structured, typed outputs.