how to get a professional website design without giving your agent 1000 design instructions?

you only need 1 GitHub repo for that: awesome-design-md.
instead of trying to describe a whole visual style in prompts every time, you give the agent a DESIGN[.]md.
same way AGENTS[.]md tells the agent how to build, DESIGN[.]md tells it how the product should look.
this repo is basically a curated library of DESIGN[.]md files extracted from real developer-focused websites.
how to use it concretely:
1. go to the repo
2. pick a style you like
3. copy that site’s DESIGN[.]md into your project root
4. ask your coding agent to build using that file
5. if needed, tweak the DESIGN[.]md instead of rewriting huge prompts