Conciseness

The body is dense and almost entirely skill-specific (divergence schema, overlap rules, hybrid bank model, composition map) with no explanation of concepts Claude already knows. It sits at anchor 4 rather than 5 because the inline 7-field signature schema and condensed overlap-rule list partially duplicate references/03-divergence-check.md, and a few explanatory sentences (e.g. "A brand that pivots its identity does not invalidate the archetype it once exemplified") could be trimmed.

Actionability

Guidance is concrete for an instruction-only skill: mechanical rules stated exactly ("share archetype AND share dominant_hue_family => SIBLING (block)"), named files to load per step, a named render template, and a specified output composition ("Output the brief plus the references list plus the divergence-check result"). Minor gaps keep it at anchor 4: the step-1 archetype selection method and the remediation path when output-side divergence blocks are deferred to the references rather than stated, so the body alone is not fully self-sufficient.

Workflow Clarity

The five steps (locate, input-side divergence, pull references, adapt, render and verify) are clearly ordered with explicit checkpoints on both sides — step 2 "Discard candidates that would land sibling... Record what was rejected and why" and step 5 "Run output-side divergence." The destructive/batch cap does not apply. It is anchor 4 rather than 5 because the error-recovery loop for an output-side block ("return to step 4 and adapt further before re-rendering") lives in references/03 rather than in the body, leaving a minor validation gap in the top-level workflow.

Progressive Disclosure

Scored against the actual bundle: all six referenced files (00-overview through 05-section-shapes-vocabulary) exist and match their one-line purpose descriptions, and the reference-bank subdirectory contains the README plus the three named seed files. References are one level deep, clearly signaled with links and a complete "Reference files" index; detail is appropriately split out (full process, template, full rule set, worked example, vocabulary) with the body honestly marking summaries ("full set in references/03-divergence-check.md"). This matches the clear-overview anchor.

Specificity

The description names its concrete deliverable — "Produce a creative brief grounded in live reference sites and deliberately distinct from existing demos" — which matches the anchor for naming a domain with 1-2 concrete actions. It stops short of anchor 4, which requires several distinct listed actions (e.g. pulling references, running the divergence check) rather than one action with qualifying modifiers.

Completeness

It explicitly answers both questions: the what is "Produce a creative brief grounded in live reference sites and deliberately distinct from existing demos, for any new brand build," and the when is "Use this skill at the start of any brand or microsite build when the result needs to land in a specific aesthetic position" followed by concrete trigger phrases. This matches the anchor requiring clear what AND when with concrete triggers.

Trigger Term Quality

"Triggers on creative brief, design brief, build brief, brand direction, where should this brand sit, what should this site look like, reference sites for, archetype for, distinct from our other brands, divergence from prior, not the same as" covers synonyms (creative/design/build brief) and natural question phrasings users would actually say, plus a scenario trigger ("prior builds have come out as siblings"). This matches the comprehensive-coverage anchor.

Distinctiveness Conflict Risk

The core niche (brief selection with divergence from shipped demos) is distinctive, but triggers like "archetype for," "brand direction," and "what should this site look like" could also route to the sibling skills the description itself names (creative-direction, brand-archetype-system). That is minor overlap risk with closely related skills — the anchor-4 example — rather than the fully conflict-free anchor 5.