Google's open-source DESIGN.md gives AI agents a prompt-ready blueprint for brand-consistent design

THE DECODER / 4/24/2026

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Key Points

  • Google has open-sourced the agent prompt behind its AI design tool Stitch, releasing it via a new DESIGN.md format.
  • The DESIGN.md format is intended to instruct AI agents to follow brand rules and maintain brand consistency in generated designs.
  • By packaging brand guidance into a prompt-ready blueprint, the release aims to make it easier to standardize design behavior across AI agents.
  • This move lowers barriers for developers and teams to integrate brand governance into AI-assisted design workflows.

Google is open-sourcing the agent prompt behind its AI design tool Stitch. The DESIGN.md format is built to teach AI agents how to follow brand rules.

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