Letting an AI Book Travel Without Giving It Your Real Card

I keep seeing people paste a credit card into a chatbot so it can book a hotel.

That is a terrible plan.

Someone on X said it bluntly this week. Raw cards and passwords in an LLM’s context are a massive risk. People still want agents that can book travel. Handing the model the real number is how that wish turns into trouble.

I’ve written before about why AI can’t count the letters in “strawberry”. Same habit here: understand what the system actually sees. There it was letter pieces. Here it’s your card.

Don’t give the model the real card

The safer shape is simple. The agent never holds your actual card number.

A payment layer hands it a virtual card — or a one-time, spend-capped token — with a short life. The agent pays with that. The airline or hotel sees a real-enough charge. Your real card stays with you, or with the vault. Not inside the prompt history.

One post put the punchline clean: agents can’t leak what they never had.

That’s the whole point.

I’m not reviewing a product. I’m not saying I use any particular vault. I’m saying: if you ever let software book a flight or a hotel for you — the kind of trip where fewer moving parts already matter — the payment path matters more than the chat demo. Temporary logins are a related idea. I’m staying on the card. That’s the part that burns money if it goes wrong.

Same filter I use on tech tools in general: does it actually help, or does it just look clever? A booking agent that needs your real card in the prompt fails that test.

If an agent ever books travel for me, I want three boring things. A virtual card or token — not the real number in the prompt. A hard spend cap. A way to kill the token the second the booking is done.

No magic. Just less blast radius.

Stay tuned… I’ll keep translating AI travel tools into plain English when the claims get ahead of the safety.