Astryx - A customizable, agent-ready open-source design system
Astryx is Meta’s open-source design system built on React and StyleX. It includes accessible components, brand-level themes, templates, dark mode, CLI/MCP docs, and customization paths for both developers and AI agents.
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Agent-readable design-system APIs are a practical shift. The key is making the allowed component contracts easier for agents to follow than inventing their own props; otherwise the system still depends on a human cleaning up drift after the fact.
token-level theming plus a full source eject covers the exact case that always bites me. every design system i've built on eventually hits one component the tokens can't express, and then it's fork-the-whole-thing or wrap it in hack divs. 90% through tokens, own the source for the last 10% — that's the escape valve i want.