Mastering Flow State Management
This lesson teaches you how to manage state across multi-step CrewAI Flows, from simple prototypes to production full-stack apps.
You'll learn the two core approaches—unstructured (dictionary) state for quick experiments and structured (Pydantic) state for type-safe, validated workflows—plus how to use the @persist decorator to make flows resumable after crashes or HITL pauses.
The guide also covers advanced patterns like routers for conditional branching, helper methods for clean state transformations, and wiring flow state into Crews so agents can read and write shared context.
Finally, it walks through a complete FastAPI + React integration that exposes flow state via REST and SSE, giving your frontend real-time progress tracking and a custom PostgreSQL persistence backend for production deployments.