import asyncio
from langchain_core.messages import AIMessage, HumanMessage
from langgraph.graph import StateGraph
from langgraph.checkpoint.memory import MemorySaver

# Simple state with messages list
class AgentState:
    def __init__(self):
        self.messages = []

async def main():
    # Placeholder for stream logic
    print("Stream AI agent placeholder")

if __name__ == "__main__":
    asyncio.run(main())