Meta open-sources its internal React design system, Astryx

Meta open-sourced Astryx, the React and StyleX-based design system it used internally for eight years across more than 13,000 apps. It ships over 150 accessible components, seven themes, dark mode, templates, and an 'agent-ready' CLI under the MIT license, requiring React 19 or later.

Why it matters: Billing the release as 'agent-ready' signals Meta is building UI infrastructure meant for AI coding agents to generate consistent, accessible interfaces, not just for human developers. It's a sign that design systems are becoming a target layer for agentic coding tools, adding to the growing stack of scaffolding built specifically for AI-driven development.