7 DESIGN.md Tips for Consistent AI-Generated UI
Key strategies to create design systems for AI coding tools.
1What is DESIGN.md?
DESIGN.md is a Markdown file serving as a portable design system for AI coding tools like Claude Code. It standardizes design principles, color palettes, typography rules, and component behaviors in a single document. This ensures visual consistency across interfaces generated by AI, particularly valuable in team collaborations and multi-project environments. The file acts as a single source of truth for all design decisions.
2Why It Matters for AI
AI tools require explicit guidelines when making design decisions. DESIGN.md ensures consistency in every detail from color choices to spacing ratios. For instance, if you specify a button's hover opacity at 70%, the AI will apply this value uniformly. This enables the creation of professional-looking interfaces without human intervention. The more detailed the specifications, the higher the output quality from generative AI tools.
31. Core Design Principles
Begin your DESIGN.md with the project's fundamental design philosophy. State key principles like 'mobile-first approach', 'accessibility-first', or 'minimalist aesthetic'. These principles guide all subsequent AI design decisions. For example, a rule like 'dark mode support is mandatory' will make the AI automatically adjust color contrasts accordingly. Well-articulated principles prevent inconsistent or contradictory outputs across different interface elements.
42. Define Color System
Document your color palette using CSS variables or HEX codes. Clearly define primary, secondary, and accent colors along with their usage purposes (background, text, accent). Include minimum contrast ratios for accessibility compliance. With this information, AI can generate WCAG 2.1 compliant color combinations. Noting the emotional impact of colors helps the AI make context-appropriate choices for different components and sections.
53. Typography Hierarchy
Specify heading, subheading, and paragraph styles with precise pixel values for size, line height, and letter spacing. Indicate whether to use Google Fonts or system fonts. The AI uses this hierarchy to create highly readable text layouts. For example, defining h1 headings at 2.5rem with 1.3 line height ensures consistent scaling across all pages. Remember to include alternative sizes for mobile devices to maintain readability across devices.
64. Component Library
Thoroughly document UI components like buttons, form elements, cards, and navigation. Define different states (active, disabled, hover) for each component. The AI uses these specifications to generate and reuse components correctly. For instance, specifying a dropdown's shadow effect and animation duration in open state ensures all menus exhibit identical behavior. Include interactive prototypes or Figma links for complex components when possible.
75. Spacing and Alignment
Establish an 8px-based spacing system (8, 16, 24, 32, 64) with usage examples for each value. The AI uses this grid to create balanced interfaces. Include basic layout patterns for Flexbox and CSS Grid. For example, specify 24px for horizontal spacing between cards and 16px between headings and content. Consistent spacing rules prevent cluttered or uneven layouts in AI-generated interfaces.
86. Responsive Behaviors
Define breakpoints and how components should adapt across different screen sizes. The AI generates optimized interfaces for mobile, tablet, and desktop based on these rules. For example, a rule like 'navigation converts to hamburger menu below 768px' enables automatic adaptive menus. Consider adding test scenarios to account for various device types and orientations in today's diverse digital landscape.
97. Maintenance Best Practices
Include guidelines for future DESIGN.md updates. Establish processes for change logs, versioning systems, and review cycles. The quality of AI-generated designs directly correlates with the document's freshness. Recommend token-based approaches (color, typography, spacing tokens) for scalability. Explain how the AI should use these design tokens to ensure system-wide consistency as the project evolves over time.
Original article: UX Planet — AI ile Tutarlı Arayüz Tasarımı için DESIGN.md Kılavuzu