entbappy/Multi-Agent-System-using-LangGraph-MCP-Supervisor-Guardrails-HITL ? reverse-engineered prompt

Build me a simple travel planning web app where I can type a trip idea and get back a draft itinerary that a supervisor agent checks before it’s shown to me.

I want a clean FastAPI based frontend with a chat style page, a way to send travel prompts, and a separate approve or request changes step before the plan is finalized. Please include basic input checks so the app handles unsafe or incomplete requests gracefully, and make the workflow feel like a human still has the final say.

Use the example weather helper too, so the planner can factor in weather when it makes sense. Keep the app easy to run locally, and make sure the main flow works from the browser and from the API. If you need to look up current docs online for LangGraph or MCP details, go ahead.