Conciseness

The body is dense with prescriptive specifics (frame dimensions, hex color, real quest-name examples, artifact contract) and explains nothing Claude already knows. It misses level 5 only on minor redundancy: step 4's shared phone elements ('Status bar', 'Bottom tab bar') are re-stated verbatim inside steps 5–7.

Actionability

Guidance is fully concrete and executable for this domain: '360×780 phone frames', '12px black bezel, 44px corner radius', hex '#0e0d0c', six ready-to-use quest titles, data-od-id requirements, and a copy-paste artifact skeleton. Per the code-vs-instruction scoring note, an instruction-only skill with this level of concrete guidance merits the top anchor.

Workflow Clarity

A clear numbered 1–9 sequence with an explicit self-check checklist ('Three frames, each with a distinct purpose', 'Tile colors don't overpower', 'Reads as gamified and adult') covers the checkpoints. It falls short of level 5 because the checks are qualitative with no feedback loop for failures, and the output contract ('One sentence before the artifact, nothing after') is not covered by the self-check — minor validation gaps rather than the missing checkpoints of level 3.

Progressive Disclosure

This is a single-purpose, self-contained skill: well-organized Workflow and Output-contract sections, no content that belongs in a separate file inlined (all spec detail is needed at generation time), and no nested references — only the runtime-injected DESIGN.md, which is clearly signaled. Anchor 5 fits better than 4 because there is nothing to relocate or reorganize.

Specificity

The description enumerates multiple concrete deliverables — 'three phone frames on a dark showcase stage', per-frame content ('cover / poster', 'today's quests with XP ribbons and a level bar', 'quest detail'), and 'vivid quest tiles, level ribbon, bottom tab bar' — with no coverage gaps. It exceeds level 4 because the enumeration is comprehensive rather than leaving minor gaps.

Completeness

Both questions are answered explicitly: the 'what' is a concrete three-frame prototype spec and the 'when' is 'Use when the brief asks for a "gamified app", …' with concrete trigger phrases, mirroring the level-5 anchor example. It is not level 4 because the when-clause is fully explicit rather than improvable.

Trigger Term Quality

Trigger phrases are natural user phrasings with synonym coverage: 'gamified app', 'habit tracker', 'RPG-style life app', 'level-up app', 'daily quests', 'XP / streak app', 'ELI5-style explainer app'. No common variation in this niche is missing, so it fits the level-5 anchor rather than level 4.

Distinctiveness Conflict Risk

It carves a clear niche (gamified/RPG-style habit-app prototypes) with distinct triggers and minimal conflict risk; only trivially adjacent families ('habit tracker', 'ELI5-style explainer app') could overlap. Anchor 5 fits better than 4, whose overlap risk would require a genuinely close sibling skill trigger.