Ex-Meta Engineer: AI Coding Agents Should Avoid Custom CSS

Vjeux · x · 2026-08-05

A former Meta front-end engineer argues that a robust component library should allow developers to build screens purely through composition. Relying on custom CSS often creates technical debt, causing issues with dark mode, design updates, and cross-app embedding.

He applied this philosophy to the AI coding tool Astryx. The team tried to prompt AI agents to write custom styles, but heavily fine-tuned models naturally resist this and prefer standard code. Avoiding custom CSS ultimately leads to more consistent UI, fewer bugs, and easier global theming.

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