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Design systems are becoming the interface AI agents actually read

Blair Metcalf's Lenny's Newsletter writeup of Reddit Proto and the UX Collective's code-first design system piece both describe wiring Figma and AI agents through MCP so component truth lives in code, not in the designer's head. If the design system itself becomes the thing agents query, the real work shifts from drawing screens to deciding which tokens, states and rules are worth encoding as ground truth.

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Reddit Proto maps design systems to code with AI

The MCP pattern connecting a design system to Cursor and achieving 100% adoption is a concrete blueprint you could adapt for any team drowning in prototype-to-production handoff friction.

Read on lennysnewsletter.com
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Pick one component in your design system and write out every hidden state (focus order, error, loading) it needs in code before touching Figma, the way the UX Collective piece describes.

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