Create Design System Rules
Overview
This skill helps you generate custom design system rules tailored to your project's specific needs. These rules guide Claude to produce consistent, high-quality code when implementing Figma designs, ensuring that your team's conventions, component patterns, and architectural decisions are followed automatically.
What Are Design System Rules?
Design system rules are project-level instructions that encode the "unwritten knowledge" of your codebase - the kind of expertise that experienced developers know and would pass on to new team members:
- Which layout primitives and components to use
- Where component files should be located
- How components should be named and structured
- What should never be hardcoded
- How to handle design tokens and styling
- Project-specific architectural patterns
Once defined, these rules dramatically reduce repetitive prompting and ensure consistent output across all Figma implementation tasks.
Prerequisites
- Figma MCP server must be connected and accessible
- Access to the project codebase for analysis
- Understanding of your team's component conventions (or willingness to establish them)
When to Use This Skill
Use this skill when:
- Starting a new project that will use Figma designs
- Onboarding Claude to an existing project with established patterns
- Standardizing Figma-to-code workflows across your team
- Updating or refining existing design system conventions
- Users explicitly request: "create design system rules", "set up Figma guidelines", "customize rules for my project"
Required Workflow
Follow these steps in order. Do not skip steps.
Step 1: Run the Create Design System Rules Tool
Call the Figma MCP server's create_design_system_rules tool to get the foundational prompt and template.
Parameters:
clientLanguages: Comma-separated list of languages used in the project (e.g., "typescript,javascript", "python", "javascript")clientFrameworks: Framework being used (e.g., "react", "vue", "svelte", "angular", "unknown")
This tool returns guidance and a template for creating design system rules.
Structure your design system rules following the template format provided in the tool's response.
Step 2: Analyze the Codebase
Before finalizing rules, analyze the project to understand existing patterns:
Component Organization:
- Where are UI components located? (e.g.,
src/components/,app/ui/,lib/components/) - Is there a dedicated design system directory?
- How are components organized? (by feature, by type, flat structure)
Styling Approach:
- What CSS framework or approach is used? (Tailwind, CSS Modules, styled-components, etc.)
- Where are design tokens defined? (CSS variables, theme files, config files)
- Are there existing color, typography, or spacing tokens?
Component Patterns:
- What naming conventions are used? (PascalCase, kebab-case, prefixes)
- How are component props typically structured?
- Are there common composition patterns?
Architecture Decisions:
- How is state management handled?
- What routing system is used?
- Are there specific import patterns or path aliases?
Step 3: Generate Project-Specific Rules
Based on your codebase analysis, create a comprehensive set of rules. Include:
General Component Rules
markdown- IMPORTANT: Always use components from `[YOUR_PATH]` when possible - Place new UI components in `[COMPONENT_DIRECTORY]` - Follow `[NAMING_CONVENTION]` for component names - Components must export as `[EXPORT_PATTERN]`
Styling Rules
markdown- Use `[CSS_FRAMEWORK/APPROACH]` for styling - Design tokens are defined in `[TOKEN_LOCATION]` - IMPORTANT: Never hardcode colors - always use tokens from `[TOKEN_FILE]` - Spacing values must use the `[SPACING_SYSTEM]` scale - Typography follows the scale defined in `[TYPOGRAPHY_LOCATION]`
Figma MCP Integration Rules
markdown## Figma MCP Integration Rules These rules define how to translate Figma inputs into code for this project and must be followed for every Figma-driven change. ### Required Flow (do not skip) 1. Run get_design_context first to fetch the structured representation for the exact node(s) 2. If the response is too large or truncated, run get_metadata to get the high-level node map, then re-fetch only the required node(s) with get_design_context 3. Run get_screenshot for a visual reference of the node variant being implemented 4. Only after you have both get_design_context and get_screenshot, download any assets needed and start implementation 5. Translate the output (usually React + Tailwind) into this project's conventions, styles, and framework 6. Validate against Figma for 1:1 look and behavior before marking complete ### Implementation Rules - Treat the Figma MCP output (React + Tailwind) as a representation of design and behavior, not as final code style - Replace Tailwind utility classes with `[YOUR_STYLING_APPROACH]` when applicable - Reuse existing components from `[COMPONENT_PATH]` instead of duplicating functionality - Use the project's color system, typography scale, and spacing tokens consistently - Respect existing routing, state management, and data-fetch patterns - Strive for 1:1 visual parity with the Figma design - Validate the final UI against the Figma screenshot for both look and behavior
Asset Handling Rules
markdown## Asset Handling - The Figma MCP server provides an assets endpoint which can serve image and SVG assets - IMPORTANT: If the Figma MCP server returns a localhost source for an image or SVG, use that source directly - IMPORTANT: DO NOT import/add new icon packages - all assets should be in the Figma payload - IMPORTANT: DO NOT use or create placeholders if a localhost source is provided - Store downloaded assets in `[ASSET_DIRECTORY]`
Project-Specific Conventions
markdown## Project-Specific Conventions - [Add any unique architectural patterns] - [Add any special import requirements] - [Add any testing requirements] - [Add any accessibility standards] - [Add any performance considerations]
Step 4: Save Rules to CLAUDE.md
Guide the user to save the generated rules to the CLAUDE.md file in their project root:
markdown# MCP Servers ## Figma MCP Server Rules [Paste generated rules here]
After saving, the rules will be automatically loaded by Claude Code and applied to all Figma implementation tasks.
Step 5: Validate and Iterate
After creating rules:
- Test with a simple Figma component implementation
- Verify Claude follows the rules correctly
- Refine any rules that aren't working as expected
- Share with team members for feedback
- Update rules as the project evolves
Rule Categories and Examples
Essential Rules (Always Include)
Component Discovery:
markdown- UI components are located in `src/components/ui/` - Feature components are in `src/components/features/` - Layout primitives are in `src/components/layout/`
Design Token Usage:
markdown- Colors are defined as CSS variables in `src/styles/tokens.css` - Never hardcode hex colors - use `var(--color-*)` tokens - Spacing uses the 4px base scale: `--space-1` (4px), `--space-2` (8px), etc.
Styling Approach:
markdown- Use Tailwind utility classes for styling - Custom styles go in component-level CSS modules - Theme customization is in `tailwind.config.js`
Recommended Rules (Highly Valuable)
Component Patterns:
markdown- All components must accept a `className` prop for composition - Variant props should use union types: `variant: 'primary' | 'secondary'` - Icon components should accept `size` and `color` props
Import Conventions:
markdown- Use path aliases: `@/components`, `@/styles`, `@/utils` - Group imports: React, third-party, internal, types - No relative imports beyond parent directory
Code Quality:
markdown- Add JSDoc comments for exported components - Include PropTypes or TypeScript types for all props - Extract magic numbers to named constants
Optional Rules (Project-Specific)
Accessibility:
markdown- All interactive elements must have aria-labels - Color contrast must meet WCAG AA standards - Keyboard navigation required for all interactions
Performance:
markdown- Lazy load images with the `Image` component from `@/components/Image` - Use React.memo for components that receive complex props - Icons should be SVG components, not icon fonts
Testing:
markdown- Include unit tests for new components in `__tests__/` directory - Use Testing Library queries (getByRole, getByLabelText) - Test all interactive states and variants
Examples
Example 1: React + Tailwind Project
User says: "Create design system rules for my React project"
Actions:
- Run
create_design_system_rules(clientLanguages="typescript,javascript", clientFrameworks="react") - Analyze codebase structure
- Generate rules:
markdown# Figma MCP Integration Rules ## Component Organization - UI components are in `src/components/ui/` - Page components are in `src/app/` - Use Tailwind for styling ## Figma Implementation Flow 1. Run get_design_context for the node 2. Run get_screenshot for visual reference 3. Map Figma colors to Tailwind colors defined in `tailwind.config.js` 4. Reuse components from `src/components/ui/` when possible 5. Validate against screenshot before completing ## Styling Rules - IMPORTANT: Use Tailwind utility classes, not inline styles - Colors are defined in `tailwind.config.js` theme.colors - Spacing uses Tailwind's default scale - Custom components go in `src/components/ui/` ## Asset Rules - IMPORTANT: Use localhost sources from Figma MCP server directly - Store static assets in `public/assets/` - DO NOT install new icon libraries
- Save to
CLAUDE.mdin project root - Test with a simple button implementation
Result: Claude now consistently follows the project's conventions when implementing Figma designs.
Example 2: Vue + Custom CSS Project
User says: "Set up Figma rules for my Vue app"
Actions:
- Run
create_design_system_rules(clientLanguages="typescript,javascript", clientFrameworks="vue") - Discover that project uses CSS modules and a custom design token system
- Generate rules:
markdown# Figma MCP Integration Rules ## Component Organization - Components are in `src/components/` - Composables are in `src/composables/` - Vue SFC structure: <script setup>, <template>, <style scoped> ## Design Tokens - IMPORTANT: All colors defined in `src/styles/tokens.css` as CSS variables - Use `var(--color-primary)`, `var(--color-secondary)`, etc. - Spacing: `var(--space-xs)` through `var(--space-xl)` - Typography: `var(--text-sm)` through `var(--text-2xl)` ## Figma Implementation Flow 1. Run get_design_context and get_screenshot 2. Translate React output to Vue 3 Composition API 3. Map Figma colors to CSS variables in `src/styles/tokens.css` 4. Use CSS Modules for component styles 5. Check for existing components in `src/components/` before creating new ones ## Styling Rules - Use CSS Modules (`.module.css` files) - IMPORTANT: Reference design tokens, never hardcode values - Scoped styles with CSS modules
- Save to
CLAUDE.mdin project root - Validate with a card component
Result: Claude now correctly translates Figma designs to Vue components using the project's design token system.
Example 3: Design System Team
User says: "Generate rules for our design system library"
Actions:
- Run
create_design_system_rules(clientLanguages="typescript", clientFrameworks="react") - Analyze the monorepo structure with design system package
- Generate comprehensive rules:
markdown# Design System Rules ## Repository Structure - Design system components: `packages/design-system/src/components/` - Documentation: `packages/docs/` - Design tokens: `packages/tokens/src/` ## Component Development - IMPORTANT: All components must be in `packages/design-system/src/components/` - Component file structure: `ComponentName/index.tsx`, `ComponentName.stories.tsx`, `ComponentName.test.tsx` - Export all components from `packages/design-system/src/index.ts` ## Design Tokens - Colors: `packages/tokens/src/colors.ts` - Typography: `packages/tokens/src/typography.ts` - Spacing: `packages/tokens/src/spacing.ts` - IMPORTANT: Never hardcode values - import from tokens package ## Documentation Requirements - Add Storybook story for every component - Include JSDoc with @example - Document all props with descriptions - Add accessibility notes ## Figma Integration 1. Get design context and screenshot from Figma 2. Map Figma tokens to design system tokens 3. Create or extend component in design system package 4. Add Storybook stories showing all variants 5. Validate against Figma screenshot 6. Update documentation
- Save to
CLAUDE.mdand share with team - Add to team documentation
Result: Entire team follows consistent patterns when adding components from Figma to the design system.
Best Practices
Start Simple, Iterate
Don't try to capture every rule upfront. Start with the most important conventions and add rules as you encounter inconsistencies.
Be Specific
Instead of: "Use the design system"
Write: "Always use Button components from src/components/ui/Button.tsx with variant prop ('primary' | 'secondary' | 'ghost')"
Make Rules Actionable
Each rule should tell Claude exactly what to do, not just what to avoid.
Good: "Colors are defined in src/theme/colors.ts - import and use these constants"
Bad: "Don't hardcode colors"
Use IMPORTANT for Critical Rules
Prefix rules that must never be violated with "IMPORTANT:" to ensure Claude prioritizes them.
markdown- IMPORTANT: Never expose API keys in client-side code - IMPORTANT: Always sanitize user input before rendering
Document the Why
When rules seem arbitrary, explain the reasoning:
markdown- Place all data-fetching in server components (reduces client bundle size and improves performance) - Use absolute imports with `@/` alias (makes refactoring easier and prevents broken relative paths)
Common Issues and Solutions
Issue: Claude isn't following the rules
Cause: Rules may be too vague or not properly loaded into the IDE/MCP client. Solution:
- Make rules more specific and actionable
- Verify rules are saved in the correct configuration file
- Restart your IDE or MCP client to reload rules
- Add "IMPORTANT:" prefix to critical rules
Issue: Rules conflict with each other
Cause: Contradictory or overlapping rules. Solution:
- Review all rules for conflicts
- Establish a clear priority hierarchy
- Remove redundant rules
- Consolidate related rules into single, clear statements
Issue: Too many rules make Claude slow
Cause: Excessive rules increase context size and processing time. Solution:
- Focus on the 20% of rules that solve 80% of consistency issues
- Remove overly specific rules that rarely apply
- Combine related rules
- Use progressive disclosure (basic rules first, advanced rules in linked files)
Issue: Rules become outdated as project evolves
Cause: Codebase changes but rules don't. Solution:
- Schedule periodic rule reviews (monthly or quarterly)
- Update rules when architectural decisions change
- Version control your rule files
- Document rule changes in commit messages
Understanding Design System Rules
Design system rules transform how Claude works with your Figma designs:
Before rules:
- Claude makes assumptions about component structure
- Inconsistent styling approaches across implementations
- Hardcoded values that don't match design tokens
- Components created in random locations
- Repetitive explanations of project conventions
After rules:
- Claude automatically follows your conventions
- Consistent component structure and styling
- Proper use of design tokens from the start
- Components organized correctly
- Zero repetitive prompting
The time invested in creating good rules pays off exponentially across every Figma implementation task.
