Conciseness

The body is ~32 lean lines with zero padding: a routing table, five one-line cross-task rules, and two resource links. It assumes Claude's competence ('Use the smallest reference that matches the task.') and explains nothing Claude already knows. Every token earns its place.

Actionability

The rules name exact, executable APIs — 'requireUserSession(event)', 'refreshSessionCookieCache(event)', 'runWithSessionRefresh()', 'clientOnly' mode — plus a concrete finishing step ('run the consumer's typecheck and the narrowest relevant auth test'). Not 5 because the body itself contains no copy-paste code or commands; implementation detail is deferred to the reference files, leaving minor gaps if read in isolation.

Workflow Clarity

A clear sequence is present: pick a reference via the task table, apply the cross-task rules, then an explicit validation checkpoint before finishing ('run the consumer's typecheck and the narrowest relevant auth test'). Not 5 because there is no error-recovery feedback loop (what to do when typecheck or the auth test fails); not 3 because the checkpoint is explicit rather than implicit.

Progressive Disclosure

Exemplary progressive disclosure: a task-to-reference routing table with 8 clearly signaled, one-level-deep links, and all 8 referenced files (installation.md, client-auth.md, server-auth.md, route-protection.md, plugins.md, database.md, client-only.md, types.md) actually exist in references/. The overview is concise and navigation is trivial.

Specificity

Lists multiple concrete actions — 'installing or configuring the module, using its client or server APIs, protecting routes, refreshing sessions, or integrating Better Auth plugins' — which comprehensively covers the skill's scope, matching the top anchor. It exceeds the 'several specific actions with minor gaps' anchor at 4 because the action list spans the module's full surface.

Completeness

Explicitly answers both 'what' ('Guides authentication in Nuxt apps using @nuxtjs/better-auth') and 'when' ('Use when installing or configuring the module, using its client or server APIs, protecting routes...') with concrete trigger phrases, exactly matching the top anchor.

Trigger Term Quality

Good natural keyword coverage: 'authentication', 'Nuxt', 'protecting routes', 'refreshing sessions', 'plugins', and the exact package name '@nuxtjs/better-auth'. Not 5 because common user phrasings like 'login', 'sign in', or 'auth middleware' are absent; not 3 because coverage is solid rather than partial.

Distinctiveness Conflict Risk

Pins the niche to a specific framework and package (@nuxtjs/better-auth in Nuxt), so triggers are distinct and conflict risk with generic auth or other framework skills is minimal.