Every section earns its place — the forbidden table, canonical imports, edge cases, and state transform patterns all convey project-specific knowledge Claude wouldn't already have. No padding or explanation of basic concepts.

Provides exact import statements, executable code patterns (getButtonBackground), a concrete forbidden/replacement table, and specific file path references. Fully copy-paste ready guidance.

This is primarily a constraint/convention skill rather than a multi-step workflow. The single task (use Emotion, not styled-components) is unambiguous, with clear rules, a forbidden table, and edge case handling that leaves no ambiguity about what to do.

References to good-examples.md, bad-examples.md, and rationale.md are well-signaled and one level deep, which is good structure. However, no bundle files were provided, so we can't verify these references exist. The main content is well-organized but the forbidden table and edge cases section could arguably be in a reference file to keep the overview leaner.

Lists multiple specific concrete actions: enforcing Emotion as the styling library, forbidding styled-components imports, handling styled.x usage, css template literals, theme provider setup, .styles.js file creation, and hover/active state styling.

Clearly answers both 'what' (enforce Emotion, forbid styled-components, handle CSS-in-JS styling) and 'when' with explicit triggers via the 'Activates on tasks involving...' clause listing specific scenarios.

Excellent coverage of natural trigger terms users would encounter: '@emotion/styled', '@emotion/react', 'styled-components', 'CSS-in-JS', 'styled.x', 'css template literals', 'theme provider', '.styles.js', 'hover/active state styling'. These are terms developers would naturally use.

Highly distinctive — targets a very specific niche (Emotion CSS-in-JS library enforcement in a particular codebase context with legacy styled-components). Unlikely to conflict with other skills due to the narrow domain and specific library references.