Meta Open-Sources Astryx, its Agent-Ready React Design System

Meta open-sourced Astryx, the React design system it built internally over eight years: 150+ accessible components, CSS design tokens, MIT licensed. The notable part is that it ships a CLI and an MCP endpoint, so coding agents can query and use the system the way engineers do. It needs React 19 and StyleX, but coexists with Tailwind, CSS Modules and plain stylesheets. Still beta, and long-term maintenance is the open question.