Lists multiple specific concrete actions and concepts: animations, hover states, shadows, borders, typography, micro-interactions, enter/exit animations, optical alignment, font smoothing, tabular numbers, image outlines, box shadows. These are highly specific design engineering capabilities.

Clearly answers both 'what' (design engineering principles for polished interfaces) and 'when' with an explicit 'Use when...' clause listing specific scenarios, plus a 'Triggers on' section with additional keyword guidance.

Excellent coverage of natural terms users would say, including both technical terms ('border radius', 'font smoothing', 'tabular numbers', 'box shadows') and natural language phrases ('make it feel better', 'feels off', 'UI polish'). This covers a wide range of how users might express their needs.

Occupies a clear niche focused specifically on UI polish and visual detail work, distinct from general frontend development or design system skills. The trigger terms like 'feels off', 'optical alignment', and 'stagger animations' are highly specific to this domain and unlikely to conflict with other skills.

Every section is lean and direct. No unnecessary explanations of what CSS properties are or how browsers work. Specific values are given (0.96, 40×40px, 100ms) without padding. The content assumes Claude knows CSS/JS and only provides the design-specific knowledge Claude wouldn't have.

Highly actionable with specific CSS properties, exact values (scale 0.96, cubic-bezier(0.2, 0, 0, 1), blur 4px to 0px), concrete formulas (outerRadius = innerRadius + padding), and conditional logic (check package.json for motion library). The guidance is copy-paste ready and leaves no ambiguity about implementation.

For a design principles skill, the workflow is well-structured: quick reference table for navigation, numbered principles for application order, a common mistakes table for debugging, and a review checklist for verification. The checklist serves as an explicit validation step. This is not a destructive multi-step operation, so the single-task scoring note applies.

Excellent progressive disclosure with a quick reference table linking to four detailed files (typography.md, surfaces.md, animations.md, performance.md), repeated as reference links at the bottom. The SKILL.md provides a complete overview with enough detail to act on, while clearly signaling where to find deeper content. All references are one level deep.