Why a DESIGN.md file beats screenshots for steering coding agents' UI work

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A developer found that asking coding agents to copy a site's look from screenshots or vague adjectives produced generic, inconsistent designs. Screenshots convey pixels rather than decisions, such as where an accent colour may be used, and hex lists lack roles, so colours spread everywhere. Their fix was a Markdown DESIGN.md file that records each colour's role, plus type scale, spacing, and do's and don'ts. This approach grew into a library of 1,239 such style files at ui.gradientdeck.com, available in compact and extended versions and exportable to Tailwind, CSS variables, or token JSON. Each style includes a live-site capture, and a file can be downloaded straight into a project root.

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