Pydantic Graph

An async graph and finite state machine library for Python, defining complex workflows and agentic logic with static type hints.

Pydantic Graph is a high-performance, async graph and state machine library built on Python's type system. It enables developers to model, execute, and visualize complex agentic workflows and decision-making processes with unparalleled type safety and clarity. Nodes are defined as `BaseNode` subclasses: edges are explicitly determined by the `run` method's return type hint, eliminating runtime errors. The library supports state persistence for long-running, interruptible processes, making it ideal for robust GenAI applications, even operating independently of the broader Pydantic AI framework.

https://ai.pydantic.dev/graph/