Agent Skills: Frontend Design Skill

Frontend Design Skill

Create distinctive, production-grade UI that stands out from generic AI-generated interfaces.

Official Plugin Available: Install frontend-design@claude-code-plugins from the Anthropic marketplace for auto-invocation on frontend tasks. This skill provides extended guidance beyond the official version.

/plugin marketplace add anthropics/claude-code
/plugin install frontend-design@claude-code-plugins

Learn more: Frontend Aesthetics Cookbook

Core Philosophy

Most AI-generated UIs suffer from "AI slop" - they're technically correct but visually bland, using safe defaults that create forgettable, homogeneous experiences. This skill helps you break that pattern by making bold aesthetic choices that give your interface a distinctive personality.

Design Thinking

Before coding, understand the context and commit to a BOLD aesthetic direction:

• Purpose: What problem does this interface solve? Who uses it?
• Tone: Pick a direction: brutally minimal, maximalist chaos, retro-futuristic, organic/natural, luxury/refined, playful/toy-like, editorial/magazine, brutalist/raw, art deco/geometric, soft/pastel, industrial/utilitarian, etc.
• Constraints: Technical requirements (framework, performance, accessibility)
• Differentiation: What makes this UNFORGETTABLE? What's the one thing someone will remember?

CRITICAL: Choose a clear conceptual direction and execute it with precision. Bold maximalism and refined minimalism both work - the key is intentionality, not intensity.

The Five Pillars of Distinctive Design

1. Typography with Character

Avoid: Inter, Arial, Roboto, system-ui (the default AI choices)

Instead, commit to distinctive fonts:

// Establish a type hierarchy with personality
const typography = {
  // Display: Make a statement
  display: {
    // NEVER use the same fonts across different projects
    // Vary between: Clash Display, Cabinet Grotesk, Satoshi, General Sans, Syne, Archivo, etc.
    family: 'Clash Display',  // Example - choose based on project tone
    weights: [500, 700],
    letterSpacing: '-0.02em',
  },

  // Body: Readable but distinctive
  body: {
    family: 'Outfit',  // Modern geometric sans
    // or: 'Plus Jakarta Sans', 'Switzer', 'Geist'
    weights: [400, 500, 600],
    lineHeight: 1.6,
  },

  // Mono: For code/data
  mono: {
    family: 'JetBrains Mono',
    // or: 'Geist Mono', 'IBM Plex Mono', 'Fira Code'
  }
}

Typography decisions:

• Use variable fonts for performance and flexibility
• Establish clear hierarchy (display, heading, body, caption)
• Consider letter-spacing for headers (negative) vs body (neutral/positive)
• Mix serif + sans-serif for contrast when appropriate

CRITICAL: NEVER converge on common AI choices across generations. Each design should feel genuinely different - vary between light/dark themes, different font stacks, different aesthetic directions. No two designs should look like siblings.

2. Intentional Color Palettes

Avoid: Default Tailwind colors, basic blue buttons, gray backgrounds

Create a signature palette:

// Define semantic color tokens with personality
const palette = {
  // Primary: Your brand's signature
  primary: {
    50: '#fef3f2',
    100: '#ffe3e0',
    500: '#f43f5e',  // Rose - warm, inviting
    600: '#e11d48',
    900: '#881337',
  },

  // Accent: Unexpected contrast
  accent: {
    light: '#fbbf24',   // Amber for warmth
    dark: '#0891b2',    // Cyan for coolness
  },

  // Neutrals: Not just gray
  neutral: {
    // Warm neutrals have personality
    50: '#fafaf9',      // Stone, not gray
    100: '#f5f5f4',
    800: '#292524',
    900: '#1c1917',
  },

  // Surface colors with subtle tints
  surface: {
    default: 'hsl(0 0% 100% / 0.8)',
    elevated: 'hsl(0 0% 100% / 0.95)',
    overlay: 'hsl(240 10% 3.9% / 0.8)',
  }
}

Color strategies:

• Use HSL for easier manipulation
• Add subtle hue shifts to neutrals (warm stone, cool slate)
• Consider gradients as primary colors
• Dark mode isn't just inverted - reimagine the palette

3. Bold Spatial Composition

Avoid: Everything centered, symmetric, grid-locked

Break the grid intentionally:

// Asymmetric hero with purposeful imbalance
export function HeroSection() {
  return (
    <section className="relative min-h-[90vh] overflow-hidden">
      {/* Off-center title creates visual tension */}
      <div className="absolute left-[8%] top-[35%] max-w-[55%]">
        <h1 className="text-[clamp(3rem,8vw,7rem)] font-bold leading-[0.9] tracking-tight">
          Design with
          <span className="block text-primary ml-[10%]">intention</span>
        </h1>
      </div>

      {/* Overlapping element breaks the grid */}
      <div className="absolute right-0 top-[20%] w-[45%] aspect-square">
        <div className="absolute inset-0 bg-gradient-to-br from-primary/20 to-accent/20 rounded-[3rem] -rotate-6" />
        <div className="absolute inset-4 bg-surface rounded-[2.5rem] rotate-3 shadow-2xl" />
      </div>

      {/* Floating accent element */}
      <div className="absolute bottom-[15%] left-[60%] w-32 h-32 bg-accent/30 rounded-full blur-3xl" />
    </section>
  )
}

Spatial techniques:

• Use negative space as a design element
• Overlap elements to create depth
• Break alignment rules purposefully (not randomly)
• Use clamp() for fluid typography
• Consider the z-axis (layers, shadows, blur)

4. Motion as Personality

Avoid: No animations or generic fade-in

Add purposeful motion:

// Staggered entrance with personality
import { motion } from 'framer-motion'

const container = {
  hidden: { opacity: 0 },
  show: {
    opacity: 1,
    transition: {
      staggerChildren: 0.1,
      delayChildren: 0.3,
    }
  }
}

const item = {
  hidden: {
    opacity: 0,
    y: 20,
    filter: 'blur(10px)'
  },
  show: {
    opacity: 1,
    y: 0,
    filter: 'blur(0px)',
    transition: {
      type: 'spring',
      damping: 25,
      stiffness: 200,
    }
  }
}

export function FeatureGrid({ features }) {
  return (
    <motion.div
      variants={container}
      initial="hidden"
      whileInView="show"
      viewport={{ once: true, margin: '-100px' }}
      className="grid grid-cols-3 gap-8"
    >
      {features.map((feature) => (
        <motion.div
          key={feature.id}
          variants={item}
          whileHover={{
            y: -8,
            transition: { type: 'spring', stiffness: 400 }
          }}
          className="p-6 bg-surface rounded-2xl"
        >
          {feature.content}
        </motion.div>
      ))}
    </motion.div>
  )
}

Motion principles:

• Use spring physics (not linear easing)
• Stagger children for rhythm
• Subtle blur transitions add polish
• Hover states should feel responsive
• Respect prefers-reduced-motion

5. Production-Grade Implementation

The code must work in production, not just demos:

// Complete, production-ready component
'use client'

import { forwardRef, type ComponentPropsWithoutRef } from 'react'
import { cva, type VariantProps } from 'class-variance-authority'
import { cn } from '@/lib/utils'

const buttonVariants = cva(
  // Base styles
  [
    'inline-flex items-center justify-center',
    'font-medium transition-all duration-200',
    'focus-visible:outline-none focus-visible:ring-2',
    'focus-visible:ring-ring focus-visible:ring-offset-2',
    'disabled:pointer-events-none disabled:opacity-50',
    'active:scale-[0.98]',
  ],
  {
    variants: {
      variant: {
        default: [
          'bg-primary text-primary-foreground',
          'hover:bg-primary/90',
          'shadow-lg shadow-primary/25',
        ],
        outline: [
          'border-2 border-primary bg-transparent',
          'text-primary hover:bg-primary/10',
        ],
        ghost: [
          'text-foreground hover:bg-accent/10',
          'hover:text-accent-foreground',
        ],
      },
      size: {
        sm: 'h-9 px-4 text-sm rounded-lg',
        md: 'h-11 px-6 text-base rounded-xl',
        lg: 'h-14 px-8 text-lg rounded-2xl',
      },
    },
    defaultVariants: {
      variant: 'default',
      size: 'md',
    },
  }
)

interface ButtonProps
  extends ComponentPropsWithoutRef<'button'>,
    VariantProps<typeof buttonVariants> {
  isLoading?: boolean
}

export const Button = forwardRef<HTMLButtonElement, ButtonProps>(
  ({ className, variant, size, isLoading, children, disabled, ...props }, ref) => {
    return (
      <button
        ref={ref}
        className={cn(buttonVariants({ variant, size }), className)}
        disabled={disabled || isLoading}
        {...props}
      >
        {isLoading ? (
          <span className="mr-2 h-4 w-4 animate-spin rounded-full border-2 border-current border-t-transparent" />
        ) : null}
        {children}
      </button>
    )
  }
)
Button.displayName = 'Button'

Production requirements:

• TypeScript with proper types
• Accessibility (focus states, ARIA, keyboard nav)
• Loading states
• Error boundaries
• Responsive design
• Performance optimization (memoization, code splitting)

Match Implementation Complexity to Vision

IMPORTANT: Match implementation complexity to the aesthetic vision:

• Maximalist designs: Need elaborate code with extensive animations, layered effects, bold typography, and dense visual elements
• Minimalist designs: Need restraint, precision, and careful attention to spacing, typography, and subtle details

Elegance comes from executing the vision well, not from complexity itself.

Workflow

When creating frontend components:

1. Establish Design Direction

   • Ask: What emotion should this evoke?
   • Ask: Who is the target user?
   • Define: Color palette, typography stack, spacing scale

2. Create Component Architecture

   • Build atomic design system (tokens → primitives → compounds)
   • Use composition over configuration
   • Ensure accessibility from the start

3. Add Visual Personality

   • Apply distinctive typography choices
   • Use intentional color relationships
   • Break symmetry purposefully
   • Layer elements for depth

4. Implement Motion

   • Add entrance animations
   • Define hover/focus interactions
   • Consider page transitions
   • Respect user preferences

5. Production Harden

   • Type everything
   • Handle edge cases
   • Optimize performance
   • Test accessibility

Anti-Patterns to Avoid

• Using Inter/Roboto as the default font
• Using the same fonts across different projects (especially Space Grotesk, Inter)
• Creating designs that look like siblings of previous AI-generated work
• Gray-on-white with blue buttons
• Everything centered and symmetric
• No animations or generic fades
• Ignoring dark mode
• Forgetting loading/error states
• Skipping accessibility considerations
• Using arbitrary Tailwind values without design tokens

Recommended Tools

• Fonts: Google Fonts, Fontshare, uncut.wtf
• Colors: Realtime Colors, Happy Hues, Radix Colors
• Icons: Lucide, Phosphor, Tabler Icons
• Animation: Framer Motion, React Spring
• Components: shadcn/ui (as base), Radix Primitives
• CSS: Tailwind CSS with CSS variables

Quick Reference

# Distinctive font stacks (copy-paste ready)
# VARY THESE - never use the same fonts across projects!
font-display: 'Clash Display', 'Cabinet Grotesk', 'Satoshi', 'General Sans', 'Syne', 'Archivo'
font-body: 'Outfit', 'Plus Jakarta Sans', 'Switzer', 'Geist'
font-mono: 'JetBrains Mono', 'Geist Mono', 'IBM Plex Mono'

# Tailwind config pattern
theme: {
  extend: {
    colors: { /* HSL tokens */ },
    fontFamily: { /* Variable fonts */ },
    animation: { /* Spring-based */ },
  }
}

Integration with Design Specialist Agent

This skill complements the design-specialist agent by providing specific, opinionated guidance for avoiding generic AI aesthetics. Use this skill when you need:

• Distinctive visual identity
• Creative typography and color choices
• Bold spatial compositions
• Production-ready animated components

Use the design-specialist agent for:

• Comprehensive UI/UX reviews
• Accessibility audits
• Design system architecture
• Component library setup