Meta just opensourced a 100-File Skill Library for Better UI Designs!
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In this video, I'll be taking a look at Astryx, the design system Meta grew internally over eight years and has now open-sourced under the MIT license, built so that you and your coding agent use the same system from the same docs. I'll go through what you get, from more than 150 accessible React components and page templates to StyleX without any build setup, CSS-variable themes and the swizzle command. Then I'll show the agent side in a real Vite React app, with init writing the rules into CLAUDE.md, the build command picking a template instead of generating code, the lookup commands, the hosted MCP server and the agent skill. After that, I'll look at Meta's nightly vibe tests against shadcn and raw HTML, including the bad night they published. Finally, I'll cover the downsides and who should actually try it.
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Key Takeaways:
🚀 Astryx grew inside Meta over the last eight years and powers more than 13,000 internal apps, and it's now open source under MIT with about 18,700 GitHub stars.
💻 You get more than 150 accessible React components with full TypeScript types (the CLI lists 174), plus page and block templates like dashboard, login, settings and AI chat.
🎨 It's written with StyleX, but you just import two prebuilt CSS files, so there's no build plugin, no PostCSS setup and no Babel config.
🔀 Themes are just CSS variables, there are seven of them plus built-in dark mode, and swizzle copies a component's full source into your project when you need full control.
🧠 The CLI is the docs: the website reads from the CLI, so there's one copy of the docs that your agent can query instead of guessing.
✅ In a fresh Vite React app, init wrote the rules into CLAUDE.md, build picked the settings template, and I had a full settings page in a few minutes, mostly npm install.
🔍 Lookup commands return exact props, variants and defaults, with JSON output, stable error codes and a dense mode, and there's a hosted MCP server with search and get tools.
📊 In Meta's nightly vibe tests, a good night scored Astryx 98, shadcn 95 and raw HTML 82, but they also published a 77 night and admit shadcn wins the most nights.
⚠️ It's still Beta on version 0.7, needs React 19 and Node 22.13 or newer, only the Neutral theme is maintained, and my single demo page was around 600 KB of JavaScript before gzip.
👍 If you're starting a new React 19 app and build a lot of UI with agents, Astryx is worth trying, but for a mature shadcn or MUI app I'd wait until it leaves Beta. Receive SMS online on sms24.me
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