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SrejonKhanSrejonKhan/agent-skills/skills/using-ui-stack/SKILL.md

using-ui-stack

Skill3 starsChanged 2 months agoMITView on GitHub

Enforce a configuration-driven design system when generating UI. Ensures consistent spacing, colors, typography, dark mode, interactions, and accessibility across all AI-generated components.

3 other projects use a version of this, 3 of them edited.

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The file

We split this skill into the rules it gives an agent

7 rules. 5 are common, 0 are distinctive, and 2 are very specific to this project.

  • 5

    Common

    Most of the 3 edited versions we read keep these.

  • 0

    Distinctive

    This author's own choices. Worth a look.

  • 2

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Common:

    Follow these rules for every component you build:

    line 13
  2. Common:

    Use multiples of 8 for all spacing (padding, margin, gap):

    line 17
  3. Very specific:

    Never use pure black (#000) for dark mode — use slate-950 or similar

    line 32
  4. Common:

    Every interactive element must have:

    line 60
  5. Very specific:

    Before generating UI, check if the project has a ui-stack config or design tokens

    line 95
  6. Common:

    If not, apply the defaults above

    line 96
  7. Common:

    Test dark mode by toggling the class/attribute and confirming all tokens map correctly

    line 98

“Common” is measured: kept by at least 6 in 10 of the 3 edited versions of this file we could read. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

Using UI Stack

Apply a structured design system to every UI component you generate. This prevents inconsistent padding, mismatched colors, and forgotten hover states.

Design System Principles

Follow these rules for every component you build:

Spacing — 8px Grid

Use multiples of 8 for all spacing (padding, margin, gap):

  • 4px — tight internal padding only
  • 8px — inline gaps, icon spacing
  • 16px — standard padding, card gaps
  • 24px — section padding
  • 32px — large section gaps
  • 48px / 64px — page-level spacing

Color — 60-30-10 Rule

  • 60% neutral/background
  • 30% primary brand color
  • 10% accent for CTAs and highlights
  • Semantic colors: success (green), warning (amber), error (red), info (blue)
  • Never use pure black (#000) for dark mode — use slate-950 or similar

Typography — 1.25 Ratio Scale

text-xs:   12px / 16px
text-sm:   14px / 20px
text-base: 16px / 24px
text-lg:   18px / 28px
text-xl:   20px / 28px
text-2xl:  24px / 32px
text-3xl:  30px / 36px
text-4xl:  36px / 40px
  • Headings: font-semibold or font-bold
  • Body: font-normal, line-height 1.5–1.75
  • Mono: use for code, IDs, numeric data

Dark Mode

  • Provide complete light/dark mappings for every color token
  • Background: white → slate-950, not black
  • Text: slate-900 → slate-100
  • Borders: slate-200 → slate-800

5-State Interactions

Every interactive element must have:

  1. Default — base appearance
  2. Hover — subtle color shift or shadow
  3. Active/Pressed — slightly darker or scaled down
  4. Focus — visible ring (ring-2 ring-offset-2)
  5. Disabled — reduced opacity, cursor-not-allowed

Accessibility

  • Contrast ratio ≥ 4.5:1 for text, ≥ 3:1 for large text
  • Touch targets ≥ 44×44px
  • Semantic HTML (button not div, nav, main, etc.)
  • Keyboard navigable — all interactions reachable via Tab/Enter/Escape
  • Respect prefers-reduced-motion for animations

Animations

  • Duration: 150–300ms for micro-interactions
  • Easing: ease-out for entrances, ease-in for exits
  • Wrap motion in motion-safe: or check prefers-reduced-motion

Overlay Z-Index Scale

dropdown:  z-10
sticky:    z-20
overlay:   z-30
modal:     z-40
toast:     z-50
tooltip:   z-60

Workflow

  1. Before generating UI, check if the project has a ui-stack config or design tokens
  2. If not, apply the defaults above
  3. For every component, verify spacing is on the 8px grid, colors follow 60-30-10, and all 5 interaction states exist
  4. Test dark mode by toggling the class/attribute and confirming all tokens map correctly

References

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