Skill UI

The API Design Reviewer provides comprehensive automated analysis of REST API designs using OpenAPI specifications. It performs linting for convention adherence, detects breaking changes between versions, and generates a design scorecard across consistency, security, and usability. Ideal for reviewing PRs, auditing API migrations, or establishing robust development standards.

This comprehensive tool validates web applications against WCAG 2.1/2.2 accessibility standards. It combines automated scanning using industry-leading tools (like axe-core, Lighthouse) with crucial manual checks for keyboard navigation, ARIA implementation, and color contrast. It is essential for QA teams and developers who must ensure high usability and accessibility for all users, including those relying on screen readers.

An expert-level skill set covering the entire spectrum of user-centered design. Mastery includes building scalable design systems using atomic principles and design tokens, conducting deep user research (usability testing, persona creation), ensuring WCAG accessibility compliance, and managing cross-platform implementation (web, mobile, desktop). Ideal for developing complex, inclusive, and highly structured digital products.

This comprehensive toolkit guides senior UX designers and researchers through the entire product development lifecycle. It covers generating data-backed personas, mapping user journeys, planning structured usability tests, and synthesizing raw research data into actionable design recommendations. Use it when conducting deep user research or validating product designs.

This framework analyzes foundational design principles—such as affordances, signifiers, and conceptual models—to create products that are highly intuitive and discoverable. It guides analysis by bridging the 'Gulf of Execution' and the 'Gulf of Evaluation.' Use this when diagnosing confusing user interfaces, poor usability, or needing to ensure a product is robustly human-centered and easy to understand.

This framework provides a systematic guide for evaluating and improving user interface usability based on established heuristic principles. It covers core concepts like 'Don't Make Me Think' and 'Get Rid of Half the Words,' helping users conduct detailed usability audits, analyze navigation flow, and optimize copy. Use this when reviewing a product's user experience, addressing user confusion, or performing a formal UX review to enhance clarity and efficiency.

A structured methodology for de-risking product ideas and validating market opportunities. This framework guides teams through defining measurable outcomes, building Opportunity Solution Trees (OST), mapping critical assumptions (Desirability, Viability, Feasibility), and planning rigorous experiments (prototyping, interviews, usability tests) before committing to full development resources. Ideal for discovery sprints and pre-build validation.

This skill reviews code differences (diffs) to identify opportunities for improvement in clarity, reusability, efficiency, and overall quality. It employs multiple specialized sub-agents (e.g., Code Reuse, Efficiency, Quality) to audit changes. It can provide high-confidence, behavior-preserving fixes when requested, ensuring the code adheres to best practices without introducing regressions. Best used when refactoring, cleaning up, or auditing a specific code scope.

Guides network operators through creating, tuning, and validating RFC 8805-compliant CSV geofeeds with opinionated best practices that improve accuracy, completeness, and usability for publicly routable IP space.

Provides a comprehensive audit of a UI component or page to ensure WCAG 2.2 AA accessibility compliance. This tool systematically checks for critical issues like insufficient color contrast, poor keyboard navigability, missing alt text, and non-semantic HTML usage. It helps developers integrate robust accessibility checks directly into their design system workflow, improving product usability for all users.

This skill allows users to generate structured and composed UI patterns—such as card sections, multi-column grids, forms, and data tables—by combining established design system primitives. It ensures consistency and reusability by adhering to defined layout rules, making complex UI development systematic and efficient.

This skill provides a comprehensive audit of user interfaces, evaluating screens against Nielsen's 10 Usability Heuristics and modern mobile UX best practices. It systematically checks for critical usability flaws, design inconsistencies, accessibility gaps, and potential dark patterns, ensuring the resulting product delivers a superior and intuitive user experience across all platforms.