Conciseness

The body is directive and free of basic-concept padding — it assumes competence and covers tool routing, credential scope, and gotchas densely. Not level 5 because of redundancy between "Do NOT use this as" and "Common mistakes", an over-long run-on checklist bullet, and inline version-sensitive detail ("With `@cloudbase/js-sdk` **3.x**...") that belongs in the extended guide rather than inline.

Actionability

Concrete, executable guidance for an instruction-only skill: exact MCP tool names and actions ("queryAppAuth / manageAppAuth", "status, start_auth, set_env, logout"), a numbered preferred execution order, and a credential-scope decision procedure. Not level 5 because the "Read [Authentication Activation Checklist](checklist.md)" prerequisite link is broken — checklist.md is absent from the bundle — and several in-body pointers (change-safety-protocol.md, calling-methods.md) live outside this bundle, leaving minor gaps a reader cannot immediately resolve.

Workflow Clarity

The workflow is clearly sequenced: activation contract with use-first/read-before/routing rules, a numbered MCP execution order (1. queryAppAuth → 2. callCloudApi fallback → 3. boundary rule → 4. return to active handlers), and a pre-check (read `auth(status)` → `credential_scope` before advising re-auth). Not level 5 because checkpoints like the activation checklist reference a missing file, so the stated validation entry point is not fully usable.

Progressive Disclosure

Good structure: a ~90-line overview body with a clearly signaled one-level-deep reference to references/extended-guide.md (verified to exist, with concrete request/response examples), a routing map to sibling skills, and a reference index. Not level 5 because extended-guide.md is linked twice (Extended guide section and Reference index) and the checklist.md reference dangles, slightly muddying navigation.

Specificity

The description lists multiple concrete actions — "inspect, enable, disable, or configure auth providers, publishable-key prerequisites, login methods, SMS/email sender setup" — comprehensively covering the provider-configuration domain, matching the level-5 anchor ('Extract text and tables from PDF files, fill forms, merge documents...'). Not level 4 because coverage of actions within its stated scope is essentially complete rather than having minor gaps.

Completeness

Explicitly answers both questions: 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..."). Matches the level-5 anchor with a clear what plus an explicit 'use when' clause with concrete trigger phrases; not level 4 because the 'when' is already explicit and specific, not merely present.

Trigger Term Quality

Good natural-term coverage: "configure auth providers", "login methods", "publishable-key", "SMS/email sender setup" are phrases users would plausibly say. Not level 5 because common variations are missing — no named providers (WeChat, Google), no "sign-in"/"authentication" synonyms, no concrete artifacts a user might mention.

Distinctiveness Conflict Risk

Clearly niched to CloudBase provider-side readiness, and the trailing phrase "before implementing a client or backend auth flow" explicitly distinguishes it from implementation skills. Third-person voice is used throughout. Minimal conflict risk; not level 4 because the boundary against sibling implementation skills is stated in the description itself.