Google released DESIGN.md as open source on April 23, 2026, a machine-readable format that gives AI agents a structured blueprint for brand-consistent design. Derived from Google Stitch, the AI design tool, DESIGN.md stores design tokens (colors, font sizes, spacing) in YAML alongside plain-text explanations of their purpose. The project is available under an Apache 2.0 license at github.com/google-labs-code/design.md and is currently in alpha.

What Happened

Google open-sourced the DESIGN.md specification from its Stitch design tool. The format pairs precise design values with human-readable context so that AI coding agents can generate interfaces that match a specific brand without guessing. Users can generate a custom DESIGN.md file for any project through Stitch at no cost.

Google also ships a CLI tool with the spec. The CLI handles validation (checking a design file for consistency), comparison (diffing two design versions), and export (converting to Tailwind CSS or W3C DTCG format). The move mirrors Anthropic launching Claude Design for visual prototyping, signaling a broader push to make AI useful for brand-consistent creative workflows.

Why It Matters

AI coding agents -- from Figma to Canva to Gamma -- today can write a component, but they cannot reliably maintain your brand without explicit constraints. DESIGN.md addresses this by encoding brand rules in a format agents can read directly, rather than relying on prompts or screenshots.

For independent creators and small studios, the practical effect is simpler: drop a DESIGN.md file into your project repository, and any AI agent you use for front-end work starts from your actual brand tokens instead of defaults. The format works across projects and platforms, meaning one file serves a website, an app, and a marketing template without manual re-specification each time.

The WCAG accessibility validation is an underrated feature. Brand compliance and accessibility compliance are often handled separately; combining them in a single structured file reduces the manual QA pass required before shipping.

Key Details

  • Released: April 23, 2026, from Google Stitch as open source
  • License: Apache 2.0
  • Status: Alpha
  • GitHub: github.com/google-labs-code/design.md
  • Format: YAML design tokens + plain-text explanations in a single Markdown file
  • CLI commands: validate, compare, export
  • Export targets: Tailwind CSS, W3C DTCG token format
  • Accessibility: Built-in WCAG compliance validation
  • Generate for free: Via stitch.withgoogle.com
  • Cross-platform: Works across projects and design tools

What to Do Next

DESIGN.md is in alpha, so it is most useful today for early adopters and teams already using AI coding agents in their front-end workflow. Here is how to evaluate it:

  • Generate your file: Go to stitch.withgoogle.com, input your brand colors and fonts, and export a DESIGN.md. The process is free and takes a few minutes.
  • Drop it in your repo: Place the file at the root of your project. AI coding agents that support context files will pick it up automatically when generating UI components.
  • Run the CLI validator: Install the CLI and run the validate command against your existing design assets to find inconsistencies you may not have noticed.
  • Watch the spec evolve: Since it is Apache 2.0, community contributions are likely. The GitHub repository is the place to track changes and file issues before the format stabilizes.

The Decoder covered the announcement at the-decoder.com.