Conciseness

The body is short, but the same content repeats: the caching/payload rationale appears in the intro, the Quick Reference ('Inline CSS breaks caching and increases HTML size'), and the Explain section, while the critical-CSS exception is restated in Quick Reference, Check, Fix, and Explain. This matches anchor 3 ('mostly efficient but includes some unnecessary explanation or could be tightened'); it is not anchor 2 because there is no padding or explanation of concepts Claude doesn't know.

Actionability

The guidance is directive but abstract — 'Move inline and embedded CSS to external stylesheets' and 'Flag exact selectors, declarations, or breakpoints' — with no concrete violation patterns (style="" attributes, <style> blocks) or a worked example in the body itself; those exist only in references/rule.md. This sits at anchor 3 rather than 4 because an instruction-only skill should still carry its key specifics inline, and above anchor 2 because the check/fix direction is concrete enough to act on.

Workflow Clarity

The Check → Fix → Explain → Code Review sections give a recognizable sequence for a simple review skill, but there are no validation checkpoints: the description promises 'Check the rendered layout across breakpoints and interaction states before proposing a fix', yet the body never includes that verification step after a fix. Anchor 3 ('steps listed but validation gaps') fits; the simple-skill exemption to 5 does not apply because the promised rendered-layout check is absent.

Progressive Disclosure

A ~45-line overview that defers 'full implementation details, code examples, and framework-specific guidance' to a single, clearly signaled, one-level-deep reference (references/rule.md), which exists and contains exactly that material. This matches anchor 5: clear overview, well-signaled one-level-deep reference, appropriate split, easy navigation.

Specificity

The description names the domain ('embedded and inline CSS', stylesheets, component styles) and a couple of concrete actions ('Check the rendered layout across breakpoints and interaction states', 'reviewing'), but the actions remain generic reviewing/checking rather than the several specific actions of anchor 4. It does not reach anchor 2 because it is well beyond a bare domain mention.

Completeness

It has an explicit 'Use when' trigger clause and a what ('Check the rendered layout across breakpoints and interaction states before proposing a fix'), satisfying anchor 4. Not anchor 5 because the what is thin relative to the when — the actual capability (flagging externalizing inline/embedded styles) is only implied by the rule title.

Trigger Term Quality

Good natural keyword coverage: 'stylesheets', 'component styles', 'responsive behavior', 'inline CSS', 'breakpoints', 'interaction states', 'rendered layout' — phrases users would naturally say. Not anchor 5 because common synonyms like '<style> tags', 'style attributes', 'critical CSS', or 'CSS in HTML' are absent.

Distinctiveness Conflict Risk

The inline/embedded CSS review niche is mostly distinct with clear CSS-specific triggers, though it could overlap with general CSS linting or code-review skills. It avoids anchor 3 because the trigger terms (inline CSS, breakpoints, interaction states) are specific enough to disambiguate from sibling skills.