Conciseness

The body explains no concepts Claude already knows — its length is genuine precision policy — but the denominator-verification rule is stated twice ("Done when" item 4 and the paragraph after step 10) and step 6 packs roughly nine conditions into a single run-on sentence. Efficient with minor trimmable repetition fits anchor 4; it is not anchor 5 because not every token earns its place, and not 3 because nothing explained is unnecessary.

Actionability

Every methodology has an explicit formula (Simple ROI, ROAS, both EMV bases, ((New Customers × contribution-margin LTV) − Investment) / Investment × 100, sum(attributed revenue)/sum(spend)), a full worked example with input and output, and per-step fill-in templates that exist in references/roi-templates.md with matching anchors. For an instruction-only skill this is copy-paste-ready guidance covering the common cases.

Workflow Clarity

Ten explicitly sequenced steps with per-step NEEDS_INPUT feedback loops (e.g., "If no valid comparator exists, return NEEDS_INPUT for EMV"), a four-item "Done when" checklist, mandatory denominator validation, a profitability-verification gate, and a termination rule (visited-set, max 3 hops). Clear sequence with explicit validation and error-recovery checkpoints matches anchor 5; no destructive/batch cap applies.

Progressive Disclosure

Good one-level-deep structure: core formulas inline, bulk templates in the verified references/roi-templates.md, each step linked to its anchor block, and a described Reference Materials section. Falls short of anchor 5 because step 9's three paragraphs of STAR R1–R6 gating detail overlap the already-referenced star-benchmark.md, and numerous ../../../ cross-skill links are unresolvable within this bundle.

Specificity

"produces direct ROI/ROAS, earned media value, attribution-modeled revenue, LTV-based ROI, and a stakeholder-ready summary" lists five concrete outputs covering the full methodology set, in third person. This matches the comprehensive-coverage anchor; score 4 would require only 'several' actions with gaps, but coverage here is complete for the domain.

Completeness

Explicitly answers both questions: 'what' via the enumerated outputs and 'when' via "Use when the user asks to..." with concrete trigger phrases, and adds a negative boundary ("Not for building the full slide/written report — use report-generator"). This is the anchor-5 pattern; the 'when' clause is explicit, not weakly implied as at 4.

Trigger Term Quality

Quotes verbatim natural user phrases — "calculate influencer ROI", "prove campaign value", "what was our ROAS" — plus ROI/ROAS/EMV/LTV vocabulary and bilingual synonyms (达人营销ROI计算/投资回报测算). Trigger phrasing is quoted as users would actually say it, exceeding the 'good coverage, few missing' anchor at 4.

Distinctiveness Conflict Risk

The influencer-ROI niche is clear and the closest conflict (report writing) is explicitly fenced off, but "prove campaign value" and "stakeholder-ready summary" retain minor overlap with same-family skills (performance-analyzer, budget-optimizer) that are not disambiguated. Fits 'mostly distinct; minor overlap risk with closely related skills' rather than the minimal-conflict anchor at 5.