I always recommend my clients advocate for themselves and let their servers know, when they are dining out, that they must avoid gluten. If your server isn’t clear, have them check with the chef.
By the way, did you know that most restaurant french fries are now made from a concoction of frozen dehydrated potatoes and wheat flour? Make sure to check. Dusting, dredging, and mixing flours is very common, and can be dangerous to those of us who are gluten free.