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From impeccable
Hardens UI interfaces for production by addressing error handling, empty states, onboarding flows, i18n, text overflow, and edge cases like extreme inputs and network failures.
How this skill is triggered — by the user, by Claude, or both
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/impeccable:hardenThe summary Claude sees in its skill listing — used to decide when to auto-load this skill
Strengthen interfaces against edge cases, errors, internationalization issues, and real-world usage scenarios that break idealized designs.
Strengthen interfaces against edge cases, errors, internationalization issues, and real-world usage scenarios that break idealized designs.
Identify weaknesses and edge cases:
Test with extreme inputs:
Test error scenarios:
Test internationalization:
CRITICAL: Designs that only work with perfect data aren't production-ready. Harden against reality.
Systematically improve resilience:
Long text handling:
/* Single line with ellipsis */
.truncate {
overflow: hidden;
text-overflow: ellipsis;
white-space: nowrap;
}
/* Multi-line with clamp */
.line-clamp {
display: -webkit-box;
-webkit-line-clamp: 3;
-webkit-box-orient: vertical;
overflow: hidden;
}
/* Allow wrapping */
.wrap {
word-wrap: break-word;
overflow-wrap: break-word;
hyphens: auto;
}
Flex/Grid overflow:
/* Prevent flex items from overflowing */
.flex-item {
min-width: 0; /* Allow shrinking below content size */
overflow: hidden;
}
/* Prevent grid items from overflowing */
.grid-item {
min-width: 0;
min-height: 0;
}
Responsive text sizing:
clamp() for fluid typographyText expansion:
// ❌ Bad: Assumes short English text
<button className="w-24">Submit</button>
// ✅ Good: Adapts to content
<button className="px-4 py-2">Submit</button>
RTL (Right-to-Left) support:
/* Use logical properties */
margin-inline-start: 1rem; /* Not margin-left */
padding-inline: 1rem; /* Not padding-left/right */
border-inline-end: 1px solid; /* Not border-right */
/* Or use dir attribute */
[dir="rtl"] .arrow { transform: scaleX(-1); }
Character set support:
Date/Time formatting:
// ✅ Use Intl API for proper formatting
new Intl.DateTimeFormat('en-US').format(date); // 1/15/2024
new Intl.DateTimeFormat('de-DE').format(date); // 15.1.2024
new Intl.NumberFormat('en-US', {
style: 'currency',
currency: 'USD'
}).format(1234.56); // $1,234.56
Pluralization:
// ❌ Bad: Assumes English pluralization
`${count} item${count !== 1 ? 's' : ''}`
// ✅ Good: Use proper i18n library
t('items', { count }) // Handles complex plural rules
Network errors:
// Error states with recovery
{error && (
<ErrorMessage>
<p>Failed to load data. {error.message}</p>
<button onClick={retry}>Try again</button>
</ErrorMessage>
)}
Form validation errors:
API errors:
Graceful degradation:
Empty states:
Loading states:
Large datasets:
Concurrent operations:
Permission states:
Browser compatibility:
Production-ready features work for first-time users, not just power users. Design the paths that get new users to value:
Empty states: Every zero-data screen needs:
Empty state types to handle:
First-run experience: Get users to their "aha moment" as quickly as possible.
Feature discovery: Teach features when users need them, not upfront.
NEVER:
Client-side validation:
Server-side validation (always):
Constraint handling:
<!-- Set clear constraints -->
<input
type="text"
maxlength="100"
pattern="[A-Za-z0-9]+"
required
aria-describedby="username-hint"
/>
<small id="username-hint">
Letters and numbers only, up to 100 characters
</small>
Keyboard navigation:
Screen reader support:
Motion sensitivity:
@media (prefers-reduced-motion: reduce) {
* {
animation-duration: 0.01ms !important;
animation-iteration-count: 1 !important;
transition-duration: 0.01ms !important;
}
}
High contrast mode:
Slow connections:
Memory leaks:
Throttling & Debouncing:
// Debounce search input
const debouncedSearch = debounce(handleSearch, 300);
// Throttle scroll handler
const throttledScroll = throttle(handleScroll, 100);
Manual testing:
Automated testing:
IMPORTANT: Hardening is about expecting the unexpected. Real users will do things you never imagined.
NEVER:
Test thoroughly with edge cases:
Remember: You're hardening for production reality, not demo perfection. Expect users to input weird data, lose connection mid-flow, and use your product in unexpected ways. Build resilience into every component.
npx claudepluginhub wang030327-bot/website --plugin impeccableHardens designs for real-world use by systematically identifying and designing for edge cases, error states, empty states, loading patterns, first-run experiences, and offline mode.
Guides building production-quality UIs with component architecture, accessibility, and state management. Use when creating or modifying user-facing interfaces.
Builds polished user-facing UIs including components, pages, layouts, forms, tables, and dashboards with autonomous design decisions on spacing, color, typography, layout, and interactions. Triggers for UI, component, frontend, design, responsive, animation tasks.