LangGraph 1 · Building graphs
Fan out to parallel workers
Return Send objects from a conditional edge to run one node per item, for example map-reduce.
from langgraph.types import Send
def fan_out(state):
return [Send("worker", {"item": item}) for item in state["items"]]
builder.add_conditional_edges(START, fan_out, ["worker"])
Official LangGraph 1 documentation