Conciseness

The body is dense and operational — checklists, tables, formulas, and anti-patterns with almost no explanation of concepts Claude already knows. A few prose passages (e.g., the intro paragraph situating the skill vs skill 21, and the churn-adjustment rationale) could be tightened, landing it at 4 rather than the every-token-earns-its-place level 5.

Actionability

Fully concrete instruction-only guidance: explicit formulas ("ROAS = Receita da campanha / Custo da campanha", "CAC Payback (meses) = CAC / (ARPA x Gross Margin %)", "break-even ROAS = 1 / gross margin %"), a 4-phase GA4 checklist with named validation tools (DebugView, Realtime, Tag Assistant), a severity table with examples, and a defined audit output format with column spec. Per the code-vs-instruction note, absence of code is not penalized since the guidance is directly executable.

Workflow Clarity

The GA4 setup has a clear 4-phase sequence with an explicit validation phase and a feedback loop: "Se a comparacao de 3-7 dias mostrar divergencia relevante (>5-10%) ... voltar pra Fase 2". The audit workflow orders output by severity, the report workflow specifies section order with audience adaptation, and the 'Evidencia de Conclusao' section adds per-task completion checkpoints. This matches the clear-sequence-with-explicit-validation anchor.

Progressive Disclosure

The single ~210-line SKILL.md inlines four substantial sub-domains (report template, GA4/GTM setup checklist, audit procedure, financial calculators) with no reference files at all, so an invocation for e.g. "calculadora de ROI" loads the entire GA4 setup body. Structure and headers are good, but content that plausibly belongs in one-level-deep reference files is inline, matching the 'could be better organized / should be separate is inline' anchor rather than the well-split level 4.

Specificity

The description lists multiple concrete capabilities across four domains: "relatorios de campanha, setup tecnico de GA4/GTM, auditoria de infraestrutura de dados de marketing e calculadoras financeiras (CAC payback, ROI/ROAS)". Each is a specific, actionable capability, matching the comprehensive-coverage anchor; not score 4 because there are no meaningful coverage gaps.

Completeness

It explicitly answers both questions: the 'what' is the four capability areas, and the 'when' is stated twice — "Use quando precisar montar relatorio de performance de Ads, configurar GA4 do zero, auditar tracking de marketing ou calcular retorno de investimento em aquisicao" plus a dedicated trigger list. This matches the anchor for explicit what AND when with concrete trigger phrases.

Trigger Term Quality

The trigger list covers natural user phrasings plus synonyms and expansions: "relatorio de ads", "performance report", "GA4", "setup GA4", "GTM", "Google Tag Manager", "Meta Ads", "CAC payback", "payback period", "ROAS", "cost per acquisition", "customer acquisition cost". Both colloquial and full-form terms are present; not score 4 because synonym coverage is essentially complete for this domain.

Distinctiveness Conflict Risk

The niche (marketing analytics ops) is distinct with domain-specific triggers (GA4, GTM, CAC payback, ROAS). However, the trigger "ROI de" is overly broad and could fire on non-marketing ROI questions, and "Google Ads" alone could match ad-copy requests rather than reporting/setup. Mostly distinct with minor overlap risk, so 4 rather than 5.