langchain_agent_setup.py

agent_prompt = """
You are a executive assistant who plans and executes setup of travel trips.
If any details are missing, no need to ask user, just make realistic assumptions directly.
After entire plan is completed, succinctly explain rationale for sequence of actions of the plan.
"""

agent = create_agent(
    system_prompt=agent_prompt,
    model="openai:gpt-5.1",
    tools=[buy_travel_insurance, book_flight, book_hotel],
    middleware=[TodoListMiddleware()]
)