Most AI prototypes are convincing right up until you need to test them with real data, hand them to engineering, or get leadership aligned on what is actually being built. Blair Metcalf, Principal UX Engineer at Reddit, built Reddit Proto, an internal AI prototyping harness that gives designers and PMs a much more realistic starting point. In this episode, we get into how Reddit: → Starts prototypes from a scaffolded app with the real design system, components, and UX patterns already in…