By now, "vibe coding" is completely normalized. You describe a thing, AI builds it, you nudge it until it gets it right. Nobody bats an eye. But what about vibe designing ? The idea has come up in cycles. AI-generated UI, prompt-driven mockups, no-Figma workflows. Every time it almost gets traction, it fizzles. The outputs are too generic, you lose control of consistency, or it only works for throwaway prototypes you'd never ship. I've been poking at Google Stitch lately, and something about it finally made the concept feel workable. Specifically DESIGN.md , a spec format that quietly reframes how AI and design systems talk to each other. Google open-sourced it last week under Apache 2.0, so any agent that writes UI code can use it, not just Stitch. What Even Is Google Stitch? Stitch is Google's AI-native design tool. You describe an app (vibe, colors, features), it generates screens, you iterate on them with natural language.…