Conciseness

The ~40-line body is a lean routing table, a short gated reference list, and four terse operating rules — no explanations of concepts Claude already knows and no padding. Phrases like "Prevents common early mistakes, especially Meeting SDK vs Video SDK and REST API vs SDK confusion" add real, non-obvious value per token.

Actionability

For an instruction-only router skill the guidance is fully concrete: the routing table maps each user intent ("Set up OAuth, tokens, scopes, or app credentials") to an exact destination skill, and the operating rules are executable directives ("Prefer one clear recommendation over a product catalog dump", "Ask a short clarifier only when the route is genuinely ambiguous"). The common routing cases are covered with no gaps.

Workflow Clarity

This is a simple, single-purpose skill whose one action — classify by job-to-be-done and route — is unambiguous: the table enumerates the routes, the references are explicitly gated ("Use these only after selecting the workflow"), and rule 2 covers the ambiguous-case fallback. Per the simple-skill note this scores 5; no destructive or batch operations apply, so no validation cap.

Progressive Disclosure

Under 50 lines with well-organized sections (What This Skill Does, Routing Table, Supporting Zoom References, Operating Rules) and all references one level deep, clearly labeled, and gated behind the routing decision. No bundle files (references/, scripts/, assets/) exist and nothing in the body belongs in a separate file, so the simple-skill exception applies cleanly.

Specificity

"Use when starting Zoom work." names the Zoom domain but states no concrete actions or capabilities whatsoever — only a trigger clause. It matches 'Names the domain but actions are minimal or generic' and falls below anchor 3, which requires 1-2 concrete actions to be stated.

Completeness

Only a 'when' is present ("Use when starting Zoom work") with the 'what' entirely absent, exactly matching anchor 2's 'only when is present without what'. It is not 3 because the skill's purpose (routing requests to implementation skills) is not even weakly implied in the description.

Trigger Term Quality

The only trigger language is "starting Zoom work" — a single generic keyword pattern. Natural phrases users would actually say ("Zoom integration", "Zoom SDK", "Zoom app", "build a Zoom bot", "Zoom OAuth") are missing, matching anchor 2 rather than anchor 3's 'some relevant keywords'.

Distinctiveness Conflict Risk

"Zoom" carves out a clear niche versus non-Zoom skills, but "starting Zoom work" would trigger for virtually every Zoom request — setup, building, debugging, planning — overlapping with all the sibling Zoom skills it routes to. This matches 'Somewhat specific but could still overlap with similar skills'; it is not 4 because the within-domain overlap risk is high rather than minor.