Google officially announced the open sourcing of the core format in its AI design tool Stitch — DESIGN.md, aiming to solve the industry challenge of maintaining brand consistency for AI Agents in interface generation through a machine-readable standardized protocol. This format integrates design tags (such as color and font parameters in YAML format) and plain text comments into machine-readable files, providing AI agents with intuitive design guidelines and logical support, enabling them to generate UI interfaces that conform to brand identity while simultaneously adhering to WCAG accessibility standards.

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As an open-source project released under the Apache 2.0 license, DESIGN.md is currently in the alpha testing phase, with its core value lying in achieving seamless transfer of design rules across projects and platforms. To support the application of this format, Google also released a command-line tool that supports validation and comparison of design files and allows exporting them into mainstream formats such as Tailwind or W3C DTCG. Users can now freely generate such custom files using Google's AI design tool Stitch, which was launched in mid-March.

Industry observers note that as Anthropic recently launched Claude Design for front-end design, the focus of competition in the AI field is shifting from pure code generation to a deeper understanding and compliant expression of UI/UX.

The release of DESIGN.md by Google essentially attempts to define a standard for design language in the AI era. By transforming abstract design aesthetics into structured data that machines can understand, this initiative has the potential to significantly reduce design loss in AI development processes and accelerate the evolution of AI Agents from simple conversational interactions to professional design-capable productivity tools.