Conciseness

Eight terse bullets with zero padding: no explanation of what a poster is, no library tours, no restating of knowledge Claude already has. Every line carries a concrete spec ('上部 30% 留白', 'text-8xl, font-black', 'from-violet-500 via-fuchsia-500 to-indigo-500'), matching 'Lean and efficient; every token earns its place'.

Actionability

Concrete, directly executable guidance: exact container classes ('w-[1080px] h-[1920px] mx-auto'), specific Tailwind gradient utilities, font scale, layout proportions, and SVG treatment for decorations and the QR placeholder. It falls short of 5 only because there is no complete copy-paste snippet covering the common case — the builder must still assemble the structure from the directives.

Workflow Clarity

This is a simple, single-purpose skill under 50 lines with no multi-step process or destructive/batch operations, so the simple-skill exception applies: the single action (compose the poster) is unambiguous. The bullets define an explicit top-to-bottom spatial sequence (upper 30% → center title → info card → bottom-right brand/QR) plus color and decoration rules, leaving no ambiguity about the construction order.

Progressive Disclosure

The body is 8 lines with no need for external references — none exist and none are required — and it is well organized as a labeled spec list under a single template heading. Per the rubric's guidance for skills under 50 lines with no external-reference need, this matches the top anchor.

Specificity

The description names the domain ("Vertical poster or Moments-style share image") but contains no concrete actions or verbs at all — it describes the artifact's look ("strong visual impact") rather than what the skill does (e.g., create/generate a poster). This matches the anchor 'Names the domain but actions are minimal or generic'; it is not a 1 because the domain itself is stated concretely, and not a 3 because no actual capability/action is listed.

Completeness

The 'what' is only implied (it describes the output, never saying it creates/generates one) and there is no 'Use when...' clause or equivalent trigger guidance, which caps completeness at 3 per the rubric guidelines. It sits at 'Has a clear what but when is missing or only weakly implied' rather than 2, since the output description is at least concrete.

Trigger Term Quality

Relevant phrases like "vertical poster" and "Moments-style share image" are natural for this domain, but common variations users would say are missing: "share card", "social media image", "marketing poster", "9:16", or an aspect/format hint. This fits 'Some relevant keywords but missing common variations or synonyms' — better than a single generic keyword (2), short of good coverage (4).

Distinctiveness Conflict Risk

"Vertical poster or Moments-style share image" carves out a clear niche (9:16 social share imagery) unlikely to collide with unrelated skills. It falls just short of 5 because it could overlap with other visual/graphic/share-card design skills, matching 'Mostly distinct; minor overlap risk with closely related skills'.