Instead of going back and forth with prompts, you give the agent a DESIGN.md that defines the design system up front, and it generally sticks to it when generating UI.
Google Stitch seems to be moving in this direction as a standard, so we put together a small collection of DESIGN.md files based on popular web sites.
Moreover, the contributing.md doesn’t mention new designs:
https://github.com/VoltAgent/awesome-design-md/blob/main/CON...
Also, folks are creating issues in the repo requesting new designs and leaving their actual email address:
The DESIGN.md files look good but I would suggest expanding on it. For example, could it include brand tone and descriptions of visual style. That way it would be helpful for writing copy text and creating art assets.