Conciseness

The body is a lean 28-line overview: one scoping sentence, six tightly written workflow steps, and a link list — no explanation of concepts Claude already knows, no padding, no filler. Every token earns its place, matching anchor 5 ("Lean and efficient; assumes Claude's competence"); it shows none of the over-explanation that would drop it to 4.

Actionability

The workflow gives real, specific direction ("user-level OAuth for user-owned resources", "check token audience, missing scopes... rate-limit headers", "signature verification and replay protection") but contains no executable detail — no endpoint names, base URL, token-flow commands, or code, and the auth guidance defers specifics to reference files that don't resolve. This lands between anchor 2 (high-level hints) and anchor 4 (mostly executable): anchor 3's "some concrete guidance but incomplete; missing key details" is the best fit.

Workflow Clarity

The six steps form a clear, sensibly ordered sequence (define resource → pick endpoint/scopes → confirm auth → implement → webhooks → debug), which exceeds anchor 2's "rough sequence with gaps". But there are no explicit validation checkpoints — nothing like "verify token/scopes before the first call" or "verify webhook signature before processing" — and step 6's debug list is a symptom checklist, not a validate-fix-retry loop, matching anchor 3 ("sequence present but checkpoints missing or implicit").

Progressive Disclosure

The split itself is right: a concise overview with one-level-deep, clearly labeled links per topic, which is anchor-4 behavior. But scored against the actual bundle, 3 of the 8 links (concepts/api-architecture.md, concepts/authentication-flows.md, troubleshooting/token-scope-playbook.md) point to paths that do not exist, and roughly 30 real bundle files (authentication.md, accounts.md, team-chat.md, phone.md, etc.) are never surfaced — navigation is broken and incomplete, which drags it to anchor 3 ("some structure but could be better organized").

Specificity

The only text is "Use when calling REST APIs" — it names a domain (REST APIs) with the single generic action of "calling", and lists zero of the skill's actual capabilities (Zoom meetings, webinars, recordings, users, auth, webhooks). This matches anchor 2 ("Names the domain but actions are minimal or generic", e.g. "Processes PDF files") rather than anchor 1, because the domain is at least identified and an action is implied; it is not anchor 3 since no concrete Zoom-specific actions are named.

Completeness

A "when" clause is present ("Use when calling REST APIs") but there is no "what" at all — the skill's purpose is never stated. This is exactly anchor 2 ("only 'when' is present without 'what'", e.g. "Use when working with documents"). It cannot be anchor 3 because there is no clear "what" to score, and cannot be anchor 1 because the "when" clause is explicit rather than entirely vague.

Trigger Term Quality

The sole keyword phrase is "calling REST APIs" — generic and structure-equivalent to the anchor-2 example "Works with files". It is missing every natural term a user with this need would say ("Zoom", "meeting", "webinar", "recording", "chat", "OAuth", "Zoom API"), so it is not anchor 3's "some relevant keywords"; it is above anchor 1 only because "REST APIs" is a phrase users do naturally say, keeping it from being pure jargon.

Distinctiveness Conflict Risk

"Use when calling REST APIs" would fire for any REST-API task — Stripe, GitHub, internal services — creating high overlap risk with virtually any HTTP-client skill, matching anchor 2 ("Very broad; high overlap risk with many similar skills"). It stays above anchor 1 because it is scoped to REST APIs rather than literally anything, but it lacks the clear niche (Zoom) that would justify 3+.