Conciseness

The Check/Fix sections are tight and operational, but the body spends tokens on things Claude already knows: the Explain section teaches that "<figure> represents self-contained content... <figcaption> provides a caption or legend", and the intro paragraph repeats the same screen-reader rationale; Quick Reference bullets also restate conditions that Check and Fix then enumerate again (figcaption as first/last child, alt-not-duplicated). This matches 'mostly efficient but includes some unnecessary explanation or could be tightened', not the 4 anchor, because multiple sections carry duplicative or already-known content.

Actionability

Check gives concrete, ordered verification criteria ("1) Such image-caption pairs are wrapped in <figure>. 2) ... 3) ... 4) The alt text... is not identical to the <figcaption> text") and Fix gives four executable steps including a nuanced alt-text decision rule and "Show the corrected HTML". Not a 5: no inline correct/incorrect HTML example in the body — the reader must open references/rule.md for the concrete markup, leaving a minor gap for the most common case.

Workflow Clarity

The Check → Fix → Explain → Code Review sequence is clear: scan with explicit flag criteria, apply numbered fixes, then "describe how to confirm the fix in DevTools" provides a verification endpoint. Not a 5: there is no explicit post-fix re-check loop (e.g., re-run the scan to confirm no remaining un-wrapped pairs), and the DevTools confirmation is mentioned as something to describe rather than a concrete checkpoint, fitting 'clear sequence with most checkpoints; minor validation gaps'.

Progressive Disclosure

The ~30-line body is a genuine overview: it keeps the rule, quick reference, and check/fix steps inline, then clearly signals exactly one level of external depth — "For full implementation details, code examples, and framework-specific guidance, see references/rule.md" (a real 153-line file) — which matches the clear-overview, well-signaled one-level-deep anchor with no competing or buried references.

Specificity

The description lists several concrete actions — "reviewing image assets, markup, and CDN or build transforms" and "Check encoded size, rendered size, loading strategy, and above-the-fold impact together" — which matches the anchor for several specific actions with minor gaps. Not a 5: the actions enumerated are image-delivery concerns that don't cover the skill's actual caption-semantics purpose (no mention of wrapping markup, alt/figcaption distinction, or accessibility), leaving real coverage gaps.

Completeness

Both what ("Check encoded size, rendered size, loading strategy, and above-the-fold impact together") and when ("Use when reviewing image assets, markup, and CDN or build transforms...") are explicit, matching the both-present anchor. Not a 5: the when clause is circular — "related to Use <figure> and <figcaption> for image captions" restates the rule title rather than naming concrete trigger scenarios (e.g., "when the user mentions captions, alt text, or image accessibility"), and the stated what is misaligned with the skill's semantic-markup purpose, so the pairing is less crisp than the anchor-5 example.

Trigger Term Quality

Good natural-keyword coverage: "image captions", "<figure>", "<figcaption>", "image assets", "markup", "above-the-fold" are phrases users would plausibly say. Not a 5: common synonyms a user would naturally invoke are missing — "alt text", "accessibility", "screen readers", "semantic HTML" — so coverage stops short of comprehensive.

Distinctiveness Conflict Risk

"Use when reviewing image assets, markup, and CDN or build transforms" plus "Check encoded size, rendered size, loading strategy, and above-the-fold impact" is generic image-optimization framing that would fire for many sibling image-delivery rules (lazy loading, formats, sizing), overlapping with similar skills; only the embedded rule title "Use <figure> and <figcaption> for image captions" is distinctive. This fits the somewhat-specific-but-overlapping anchor, not the 4 anchor, because the shared boilerplate creates more than minor overlap risk within a family of similarly templated image skills.