Conciseness

Largely operational guidance that assumes Claude's competence — no beginner explanations of what auth or MCP is — with only minor trimmable fat: the 'Reference index' section duplicates the extended-guide pointer already given in 'Extended guide', and the meta-commentary '(required for skill lint reachability)' serves the linter, not the agent. Matches anchor 4 ('efficient; minor instances of over-explanation').

Actionability

Concrete, executable guidance for an instruction-only skill: named MCP tools with their exact operations ("queryAppAuth / manageAppAuth", "auth: status, start_auth, set_env, logout, get_temp_credentials"), a preferred execution order, a concrete prerequisite ("CloudBase environment ID (env)"), and specific failure semantics (gateway 401, "await auth.signInAnonymously()"). Not 5 because no sample queryAppAuth/manageAppAuth call shapes appear inline — those are deferred entirely to extended-guide.md.

Workflow Clarity

The 'Preferred execution order' gives a clear 4-step sequence with checkpoints: a change-safety gate ("without first following the Change Safety Protocol") and a readiness confirmation gate ("after the required login method and publishable key are confirmed"), matching anchor 4. Not 5 because there is no explicit post-change verification step (e.g., re-query the provider to confirm the new state) inline for configuration changes.

Progressive Disclosure

The core pattern is good — a lean overview pointing one level deep to the real references/extended-guide.md — but scored against the actual bundle: the required reading link "[Authentication Activation Checklist](checklist.md)" points to a file that does not exist in the bundle, and "cloudbase-platform/references/protocols/change-safety-protocol.md" is a non-resolving path (siblings are referenced elsewhere as `../`-relative). Broken navigation to a file the skill marks as mandatory reading is more than a minor organization gap, pulling this below anchor 4 to 3.

Specificity

Lists several concrete actions ("inspect, enable, disable, or configure auth providers") plus specific objects ("publishable-key prerequisites, login methods, SMS/email sender setup"), matching the 'several specific actions; minor gaps' anchor. Not a 5 because "login-readiness guide" and the catch-all "other provider-side readiness" leave coverage slightly open-ended, and individual providers (WeChat, Google, etc.) are not named.

Completeness

Explicitly answers both: what ("CloudBase auth provider configuration and login-readiness guide") and when ("This skill should be used when users need to inspect, enable, disable, or configure auth providers...") with concrete trigger phrases, mirroring the anchor-5 example structure. Score 4 would require the 'when' to be less explicit, but here it enumerates specific triggering conditions.

Trigger Term Quality

Good natural keyword coverage — "auth providers", "login methods", "SMS/email sender setup", "publishable key", "auth flow" — matching anchor 4 ('good keyword coverage; a few natural terms missing'). Not 5 because common variants like "sign-in", "third-party login", "WeChat login", or "authentication" are absent.

Distinctiveness Conflict Risk

Clear niche (provider-side configuration) explicitly bounded against implementation ("before implementing a client or backend auth flow"), giving mostly distinct triggers. Not 5 because the CloudBase plugin family contains sibling auth skills (web, miniprogram, nodejs, http-api) and broad terms like "auth flow" create minor overlap risk with those closely related skills.