Conciseness

The body is structured and assumes Claude's competence, but several parts could be tightened or moved: the "Sibling skills (local only)" section duplicates the "Then also read" routing, the "Minimal checklist" item is a dense paragraph ("Anonymous login is disabled by default... otherwise the gateway returns 401. For apps that require verified login (e.g. admin panels), enforce AuthGuard / RLS...") far beyond "minimal", and conversational framing like "Read this before telling a user to 're-authorize'..." pads tokens. Not a 2 because there is no basic-concept padding and the routing content genuinely earns its place; not a 4 because the tightening needed goes beyond minor trims.

Actionability

Concrete, executable routing is provided: "queryAppAuth / manageAppAuth: app-side authentication configuration. Use them for login methods, provider settings, publishable key, static domain, client config, and custom login keys", a numbered "Preferred execution order" with an explicit fallback rule ("Use callCloudApi only as a fallback or for debugging raw request shapes"), and named auth-tool operations (status, start_auth, set_env, logout, get_temp_credentials). Not a 5 because no example invocations or request shapes appear inline — the executable payloads are deferred to references/extended-guide.md. Not a 3 because the tool-routing guidance itself is specific and directly actionable.

Workflow Clarity

A sequence exists (the "Preferred execution order" steps 1-4 plus the Activation Contract's use-first conditions), but verification checkpoints are only implicit — the gotcha "Writing login UI before enabling the required provider" implies a confirm-before-proceeding step that is never stated as an explicit checkpoint, and there is no re-query-to-confirm loop after a provider change. Not a 2 because the steps that are listed are well defined and coherent; not a 4 because checkpoints are missing rather than merely minor-gapped.

Progressive Disclosure

The body is an overview that correctly defers detail one level deep to a real packaged file ("[extended-guide.md](references/extended-guide.md)"), but navigation is broken by the dangling link "[Authentication Activation Checklist](checklist.md)" — checklist.md is not in the bundle and is absent from the "Reference index" of packaged files — plus the dense anonymous-login and credential-scope passages that belong in the reference file. Not a 2 because the overall structure is genuinely good with clearly signaled one-level-deep references; not a 4 because the missing in-bundle file is a real navigation defect, not a minor organization gap.

Specificity

The description lists multiple concrete actions — "inspect, enable, disable, or configure auth providers, publishable-key prerequisites, login methods, SMS/email sender setup" — giving comprehensive coverage of the provider-configuration domain. It is not a 4 because the action list covers the domain's core operations (status checks, toggling, key prerequisites, sender setup) without notable gaps.

Completeness

Both halves are explicit: the what ("CloudBase auth provider configuration and login-readiness guide") and the when ("This skill should be used when users need to inspect, enable, disable, or configure... before implementing a client or backend auth flow") with concrete trigger phrases. Not a 4 because the when-clause is fully explicit rather than merely present.

Trigger Term Quality

Natural trigger terms are present — "auth providers", "login methods", "SMS/email sender setup", "publishable key" — that users would plausibly say. It is not a 5 because common synonyms like "sign-in", "log-in", or "third-party login" are missing, keeping keyword coverage short of comprehensive.

Distinctiveness Conflict Risk

The scoping to "provider-side readiness before implementing a client or backend auth flow" clearly separates it from implementation skills. Not a 5 because sibling auth skills in the same plugin cover adjacent auth territory, so a bare "login" or "auth" request carries some overlap risk with those closely related skills.