What problem does it solve? Designers and developers often ship interfaces without systematic UX validation, missing antipatterns, accessibility issues, and violations of established usability principles that hurt user experience. ## Core Features & Use Cases - Principle-Based Evaluation: Assess interface descriptions against 168 research-backed UX/UI principles with structured findings, severity levels, and remediation steps. - Antipattern Detection: Identify UX smells and antipatterns using the uxuiprinciples taxonomy, including checks for AI-powered interfaces against 44 AI-era UX principles. - Use Case: Before implementing a new checkout flow, describe the screens to the flow-checker skill to validate decision points, error handling, and feedback patterns against established UX research. ## Quick Start Ask the AI to evaluate your interface description against UX principles, for example: review this login screen for usability issues and antipatterns.