Google open-sources Stitch's DESIGN.md for brand-consistent AI agent design
TL;DR
Google open-sourced the DESIGN.md file from its Stitch project, providing a structured template for prompting AI agents to produce brand-consistent design output.
What changed
Google released the DESIGN.md file from its Stitch project as an open-source resource. The document is a structured framework for capturing brand identity, visual guidelines, and tone of voice in a format that AI agents can read and follow during generation tasks.
Why it matters
For solo makers using Cursor, Claude Code, Lovable, or v0 to ship products, the failure mode is the same: prompts drift, output looks generic, and every new component requires re-explaining the brand. A persistent constraints file in the repo root is the fix, and DESIGN.md is now a battle-tested version of that file. It turns one-off prompts into a system that compounds across iterations.
What to watch for
Fork the schema, fill it with your actual brand rules, and reference it in your agent's project instructions. Test it by regenerating a component you already have and comparing the output. If the brand alignment improves, expand it to cover voice, layout grids, and component patterns. Treat it as a living spec that gets sharper every time you ship.
Who this matters for
- Vibe Builders: Drop DESIGN.md into your Cursor or Claude Code project root to lock agent output to your brand rules.
Harsh’s take
Vague prompting is why your AI-generated landing pages look like every other AI-generated landing page. Google just handed you a working template for the boring discipline you have been skipping: writing your brand rules in a format the model actually respects. This is the difference between an MVP that looks generic and one that looks like a product.
Commit DESIGN.md to your repo, point your Cursor or Claude Code agent at it, and stop re-explaining your brand in every prompt. The 30 minutes you spend filling it out compounds across every component, every page, every iteration. If you are vibe-coding without a constraints file, you are paying for tokens that produce noise.
by Harsh Desai
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