What problem does it solve?
Harden addresses the failure points that appear when interfaces meet messy inputs, unreliable networks, inconsistent data, and real user behavior that breaks idealized designs.
Core Features & Use Cases
- Edge-case input resilience: Stress tests for very long/short strings, special characters (emoji, RTL, accents), large numbers, and empty states to prevent crashes and layout breakage.
- Production-grade error handling: Clear recovery flows for network/API/validation/rate-limit/permission errors, including graceful degradation and retry patterns.
- Internationalization and accessibility hardening: i18n-ready layouts for text expansion and RTL, plus accessibility resilience for keyboard, screen readers, contrast, and motion sensitivity.
- Performance and boundary safeguards: Strategies for loading states, large datasets (pagination/virtualization), concurrency/race conditions, and memory leak prevention.
Quick Start
Use the harden skill to review and improve an interface so it correctly handles overflow, i18n/RTL, robust error states, and empty/loading/large-data scenarios.