#design-system

Meta has released Astryx, a React design system it used internally for eight years and that powers over 13,000 apps, on GitHub under the MIT license, with themes, templates, and a hosted MCP and command-line tool for AI coding assistants. It is currently in Beta and requires React 19.

Use when a user is building a React UI and the project uses Astryx (@astryxdesign/core), or when they name Astryx or ask about its components, themes, or upgrades. Check component docs and templates first via the hosted MCP (search, get) or @astryxdesign/cli before writing code; get consent before running commands that write files; never run the unscoped npx astryx. Use case: Have the agent write UIs following Meta's Astryx component conventions instead of guessing from memory