Build a CrewAI Flow

How to write a Flow that wires correctly, keeps typed state, persists and resumes, and calls crews and agents, on the current API.

Verified against crewai 1.15.22 and 1.15.23 on 2026-10-01. Live-tested on CrewAI AMP and real LLMs on 2026-10-01. Run crewai version first; if the major/minor differs from 1.15, re-verify version-sensitive rows with the ask-docs skill before trusting them.

1. Scaffold and run a flow project

crewai create flow lead-router      # the package is still lead_router
cd lead_router
crewai install                      # uv sync; writes uv.lock
crewai run                          # runs the `kickoff` script in pyproject.toml
crewai flow plot                    # runs the `plot` script