LangGraph Parallel Execution

Run independent nodes concurrently for performance.

Fan-Out/Fan-In Pattern

from langgraph.graph import StateGraph

def fan_out(state):
    """Split work into parallel tasks."""
    state["tasks"] = [{"id": 1}, {"id": 2}, {"id": 3}]
    return state

def worker(state):
    """Process one task."""
    task = state["current_task"]
    result = process(task)
    return {"results": [result]}