structured outputs help, paired with regular old systems design I think you can get pretty far. it really depends what you're building though.

>If your AI travel agent books vacations to the correct destination only 90% of the time

that would be using the wrong tool for the job. an AI travel agent would be very useful for making suggestions, either for destinations or giving a list of suggested flights, hotels etc, and then hand off to your standard systems to complete the transaction.

there are also a lot of systems that tolerate "faults" just fine such as image/video/audio gen