How do I stop my AI feature from making things up in front of customers?

Models hallucinate because they are trained to always answer; your job is to constrain them, not to hope. The biggest wins in order: ground answers in your own retrieved data with citations (RAG), force structured outputs so responses are validated before display, let the model say "I don't know", and add guardrails plus human review on high-stakes actions. Air Canada and Cursor both learned publicly that you own whatever your bot says, so treat reliability as a launch requirement, not a polish item.

A quick orientation. The real value is below: resources worth your time, from people who've actually done it.