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Astryx
Launched this week
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.
Free
Launch Team
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.
Does the CLI reference update automatically when components change?
The "eject the component" option sounds great until you're the one maintaining a forked mess later.
No mention of Vue or Svelte support here that's a gap for some teams.
8 yrs of internal use means it's battle tested, but packaging something for public use is a different job entirely.