Google open sources DESIGN.md to give AI agents a universal design language

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Google open-sourced the draft specification for DESIGN.md, a structured format for documenting design systems. This move allows AI agents to follow brand-specific rules and accessibility standards across any platform without manual intervention. By standardizing how design intent is communicated, Google is removing the friction of inconsistent UI generation in agentic workflows.

Google open-sourced the draft specification for DESIGN.md, a structured Markdown format from its Stitch AI-native design tool. The format encodes brand rules, typography, and spacing into a machine-readable file. This allows AI agents to understand design reasoning rather than guessing visual intent.
Format
Markdown-based (.md)
Availability
Open-source draft specification
Repository
GitHub (google-labs-code)
Core capabilities
Brand rules, typography, spacing, component logic
Compliance support
WCAG accessibility validation
Primary integration
Stitch web application

This update addresses the "hallucination" problem in vibe design, where agents often ignore brand constraints or accessibility requirements. By providing a standardized "README" for visual identity, Google is creating an interoperable bridge between design systems and agentic coding tools. It follows Google's push to provide agents with structured primitives.

You can now implement this specification to ensure generated user interfaces remain on-brand. The draft is available on GitHub, and you can generate files within the Stitch web application. This enables a seamless transfer of design rules, ensuring that every AI-generated component validates against WCAG accessibility standards.

View the full update on blog.google
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Google AI Developers
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🪡 @stitchbygoogle app’s DESIGN.md format is now open-source! Designers can seamlessly transfer design rules across projects, tools, and platforms to keep generated UI on brand. https://t.co/lOgUKOxTtR

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Still wondering? A few quick answers below.

DESIGN.md is a structured Markdown file format created by Google to document design systems for AI consumption. It stores specific rules for colors, typography, and spacing, allowing designers to export and import these rules between projects. This ensures that AI tools have a persistent understanding of a brand's visual identity and design reasoning.

Instead of guessing a designer's intent, AI agents use the DESIGN.md file to follow exact brand rules and validate their choices against WCAG accessibility standards, which are global guidelines for inclusive design. This structured context prevents the AI from hallucinating incorrect styles and ensures that generated user interfaces remain consistent with the established design system.

Yes, Google has open-sourced the draft specification for DESIGN.md. By making the format an open standard, Google allows any third-party tool, platform, or developer to implement the format. The specification is currently hosted on GitHub, where the community can contribute to its development and use it to build interoperable design workflows.

You can generate and manage DESIGN.md files directly within Stitch, Google's AI-native design application. Because the format is now an open standard, you can also access the draft specification on GitHub to integrate it into your own custom tools or AI agentic workflows—systems where AI models autonomously perform multi-step tasks—enabling the seamless transfer of design rules.

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