4.5 ノードの定義

def flight_specialist_node(state: PlannerState) -> PlannerState:
    llm = _create_llm(
    "flight_specialist", temperature=0.4, session_id=state["session_id"]
    )

    step = (
        f"Find an appealing flight from {state['origin']} to {state['destination']} "
        f"departing {state['departure']} for {state['travellers']} travellers."
    )

    messages = [
        SystemMessage(content="You are a flight booking specialist. Provide concise options."),
        HumanMessage(content=step),
    ]

    result = llm.invoke(messages)
    state["flight_summary"] = result.content
    state["messages"].append(result)
    state["current_agent"] = "hotel_specialist"
    return state