Conciseness

The body is dense and bullet/table-driven ("3-7 items (not overwhelming)," "Max 3-5 steps per tour," trigger timings "24h, 72h") with no concept-explainer padding. Minor trimmable duplication exists: "Task-Specific Questions" repeats three questions already asked in "Initial Assessment," and "Experiment Ideas" summarizes content already offloaded to references/experiments.md — anchor 4 rather than 5.

Actionability

Concrete guidance dominates: a trade-off table for post-signup approaches, checklist and tour best practices, a drop-off funnel example with percentages, an email trigger schedule, and a defined Output Format ("Finding → Impact → Recommendation → Priority"). It misses anchor 5 because common cases lack worked examples (no sample audit finding, sample empty-state copy, or sample checklist); it is well above anchor 3's pseudocode-level vagueness.

Workflow Clarity

An engagement sequence exists (read product-marketing-context → Initial Assessment → define activation → audit/design → Output Format) but it is spread across topical sections with no explicit stepwise ordering and no checkpoints such as confirming the activation definition with the user before designing flows. This matches anchor 3 (sequence present but implicit, checkpoints missing) rather than anchor 4's explicitly ordered steps with most checkpoints present.

Progressive Disclosure

The single bundle file references/experiments.md exists, is one level deep, and is cleanly signaled ("For comprehensive experiment ideas: See references/experiments.md") while the body correctly holds only a summary of it. Minor gap: at ~215 lines, additional content (e.g., the "Common Patterns by Product Type" table, multi-channel email details) could also be split into references, so anchor 4 fits better than the fully-split anchor-5 structure.

Specificity

The description names the domain and 1-2 concrete actions ("optimize post-signup onboarding, user activation, first-run experience, or time-to-value") but offers no comprehensive list of specific capabilities such as auditing flows, designing checklists, or writing empty-state copy. It sits at anchor 3: not anchor 4 (which requires several specific listed actions) and above anchor 2 (which lacks any concrete action verbs).

Completeness

Both parts are present: an explicit, richly triggered "when" ("When the user wants to… Also use when the user mentions…") and a stated "what" ("optimize post-signup onboarding, user activation…"). However, the "what" rests on a single generic verb (optimize) with no indication of what the skill actually produces, so it falls short of the anchor-5 example where concrete capabilities are enumerated; it is clearly above anchor 3 where the when is missing or only weakly implied.

Trigger Term Quality

Eight natural quoted trigger phrases ("onboarding flow," "activation rate," "user activation," "first-run experience," "empty states," "onboarding checklist," "aha moment," "new user experience") plus synonyms ("post-signup onboarding," "time-to-value") give comprehensive coverage users would actually say. File extensions are inapplicable to this domain, so nothing natural is missing; anchor 5 fits better than anchor 4.

Distinctiveness Conflict Risk

Explicit boundary guidance disambiguates the two most-confusable adjacent skills ("For signup/registration optimization, see signup-flow-cro. For ongoing email sequences, see email-sequence"), and the post-signup activation niche has distinct triggers, matching the anchor-5 clear-niche/minimal-conflict example exactly.