Conciseness

The ~30-line body is dense and free of concept over-explanation, with deprecated legacy keys correctly fenced off. Minor trimmable content remains: the parenthetical '(API proxy in-run, access token + platform host, PAT, and service account)' on the auth page line duplicates the context table below it, and 'Applies to Domino 6.3 and Domino Cloud' restates the frontmatter compatibility. That places it at anchor 4 ('minor instances... that could be trimmed') rather than anchor 5's every-token-earns-its-place.

Actionability

Concrete, executable guidance is present: exact env vars (DOMINO_API_PROXY, DOMINO_USER_HOST, DOMINO_API_HOST), an exact endpoint (http://localhost:8899/access-token), and explicit header rules ('no Authorization header when set', 'Bearer PAT'). It stops short of anchor 5 because there is no copy-paste example of an actual authenticated request, and the detailed steps are delegated to reference files and an external docs page.

Workflow Clarity

The sequence is clear and unambiguous for a single-purpose skill: read first, pick auth mode via the explicit in-run/outside-run decision table, pick host via HOSTS.md, then move to domain skills. It sits at anchor 4 rather than 5 because there is no validation checkpoint (e.g., a test GET to confirm the token works) before proceeding to automation work.

Progressive Disclosure

The body is a genuine overview with a 'Reference files (this skill)' table giving one-level-deep, clearly signaled references with a 'Use when' column — structurally matching the anchor-5 pattern. However, none of the five referenced files (HOSTS.md, LIMITS.md, ERRORS.md, SDK-MAP.md, API-SPECS.md) exist in this evaluation bundle (no references/, scripts/, or assets/ directories), so navigation could not be verified, capping this at anchor 4.

Specificity

The description enumerates concrete coverage areas with specifics: 'authentication (API proxy, PAT, service account), which host to use for which API, pagination limits, and common errors' — four concrete capabilities with named methods, comprehensively covering the skill's scope. Anchor 4 falls short because nothing is generic here and coverage has no real gaps; anchor 5's 'multiple specific concrete actions; comprehensive coverage' matches exactly.

Completeness

It explicitly answers both: what ('Introduction to calling Domino platform APIs. Covers authentication..., which host..., pagination limits, and common errors') and when ('Use before any other Domino API, SDK, app, extension, or governance automation skill'). Both are concrete and explicit, matching the anchor-5 exemplar; anchor 4 would require the 'when' to be less specific than this explicit trigger clause.

Trigger Term Quality

Natural terms are present — 'calling Domino platform APIs', 'SDK', 'app', 'extension', 'governance automation', 'PAT', 'pagination' — which a Domino user would plausibly say. A few common variations are missing (e.g., 'REST API', 'HTTP', 'API key', 'requests'), so it is good-but-not-comprehensive coverage, matching anchor 4 rather than anchor 5's synonym-and-extension completeness.

Distinctiveness Conflict Risk

The Domino platform niche is clear and the description scopes itself to API/automation usage, but 'Use before any other Domino API, SDK, app, extension, or governance automation skill' intentionally triggers alongside every sibling Domino skill, creating minor overlap risk with closely related skills. This fits anchor 4 ('mostly distinct; minor overlap risk with closely related skills') better than anchor 5's minimal-conflict profile.