Conciseness

The body is mostly efficient and short, but there is noticeable redundancy: "Do not lock the interface to portrait-only or landscape-only" (Quick Reference), "Remove orientation locks" (Fix), "Flag any use of orientation locks" (Check), and "require one orientation" (Code Review) repeat the same point across four sections, and the wheelchair/stand intro paragraph explains motivation Claude can infer. This fits anchor 3 ('mostly efficient but includes some unnecessary explanation or could be tightened') better than anchor 4, where over-explanation would be only a minor instance.

Actionability

For an instruction-only skill the guidance is concrete: "Rotate the page between portrait and landscape on mobile and tablet viewports", "Flag any use of orientation locks, rotate-device overlays that block content", and "Flag exact selectors, components, or route states". It stays at anchor 4 rather than 5 because it stops short of naming the specific detectable patterns (e.g., `screen.orientation.lock()`, orientation media queries, manifest `orientation` fields), deferring those entirely to the reference file.

Workflow Clarity

The Check → Fix → Explain → Code Review sections form a clear, unambiguous sequence for a simple single-purpose review skill, which is well above the anchor-3 'steps listed but checkpoints missing'. It does not reach 5 because there is no verification checkpoint after the Fix step (e.g., re-rotate and re-verify that the revised layout works in both orientations), leaving a minor validation gap.

Progressive Disclosure

The body is a concise ~30-line overview with well-organized sections and a single, clearly signaled, one-level-deep reference — "For full implementation details, code examples, and framework-specific guidance, see `references/rule.md`" — and that file actually exists in the bundle with the promised content (code examples, CSS/JS guidance). This matches the anchor-5 pattern of a clear overview with well-signaled references.

Specificity

The description names the domain and several concrete actions — "Check rendered behavior in both portrait and landscape" and "separate genuine layout constraints from unnecessary orientation assumptions" — which are specific and actionable. It falls just short of anchor 5 because coverage of what the skill does is limited to these two actions rather than a comprehensive list (e.g., no mention of fixing or flagging), and sits above anchor 3 because the actions given are more specific than the minimal '1-2 generic actions' pattern.

Completeness

It explicitly answers 'when' with a concrete "Use when reviewing..." clause listing six trigger contexts, and 'what' with "Check rendered behavior in both portrait and landscape and separate genuine layout constraints from unnecessary orientation assumptions". This matches the anchor-5 good example pattern (clear what + explicit Use-when with concrete trigger phrases), not anchor 4, since neither half is weak or merely implied.

Trigger Term Quality

Trigger terms are natural and varied: "mobile-first layouts, tablet experiences, fullscreen flows, forms, dashboards, or media interfaces", plus "portrait and landscape". It falls short of anchor 5 because common synonyms a user might say are missing from the trigger clause — 'orientation', 'rotate/device rotation', 'responsive' — which keeps it at 'good keyword coverage; a few natural terms missing'.

Distinctiveness Conflict Risk

The core trigger is a distinct niche (orientation/portrait-landscape review), so it is mostly distinguishable from other skills. Minor overlap risk remains with closely related skills because broad trigger terms like "forms", "dashboards", and "media interfaces" could fire for general form or dashboard work that has nothing to do with orientation — matching 'minor overlap risk' at anchor 4 rather than the clean niche of anchor 5.