Conciseness

The body is dense with skill-specific facts (match-rate ranges, recovery percentages, hashing normalization rules, the four consent parameters) with almost no padding, but it explains some concepts Claude already knows ("Client-only tags lose data to ad blockers and 7-day browser cookie caps") and includes the time-sensitive date "Required for EEA traffic since March 2024" outside any deprecated section, fitting anchor 4 rather than 5.

Actionability

Guidance is concretely executable in its environment — named tool calls (`ga4_get_conversions`, `list_audiences`, `get_pixel_health`), exact hashing rules ("SHA-256 hashed email/phone/address... lowercase, trim, E.164 phone format"), dedup via a "shared `event_id`" — but some steps remain directional ("Define a seed from the best customers and hand off its construction to the platform UI") with no code examples, matching anchor 4.

Workflow Clarity

Seven numbered steps in sensible dependency order (audit → capture → consent → activation) with distributed verification checkpoints ("verify with a test event", "Verify consent signals in Google Ads diagnostics and GA4 admin after deploying", and the end-to-end checks in step 7). It falls short of anchor 5 because error recovery is heuristic ("fix the data before blaming the platform") rather than explicit validate-fix-recheck loops.

Progressive Disclosure

No bundle files exist, and the single SKILL.md is well organized into seven numbered sections plus a Rules section with nothing buried. It misses anchor 5 because the ~57-line body slightly exceeds the under-50-line simple-skill exception and platform-specific implementation detail (e.g., CAPI event payloads, CMP setup) could reasonably live in reference files.

Specificity

Names several concrete capabilities — "Enhanced Conversions, server-side tracking, Consent Mode v2, and planning how to use owned data for targeting" — but coverage has minor gaps (the audit and match-rate work from the body are unmentioned), matching anchor 4 rather than the comprehensive anchor 5.

Completeness

Clearly answers both: a concrete "what" (build a first-party data pipeline covering four named components) and an explicit "Use when a user wants to..." clause listing four concrete trigger scenarios, matching the anchor-5 example structure exactly; it is not 4 because the when-guidance is already explicit and specific.

Trigger Term Quality

The when-clause includes natural phrases users would say — "recover lost conversion data", "set up Enhanced Conversions or CAPI", "implement consent mode", "plan for cookie deprecation" — with good synonym coverage (CAPI), though a few natural variants like "server-side tagging" or "Conversions API" spelled out are missing, so it fits anchor 4 rather than 5.

Distinctiveness Conflict Risk

The post-cookie measurement niche is clear and triggers like "Enhanced Conversions", "CAPI", and "consent mode" are distinct, but "recover lost conversion data" could overlap a generic conversion-tracking skill (which the body itself cross-references), fitting anchor 4's "minor overlap risk with closely related skills" rather than 5.