Lists multiple specific concrete patterns and concepts: 'reactivity pitfalls, composable structure, Pinia setup stores, watch vs computed, storeToRefs, template refs, provide/inject, and accessibility' - these are all concrete, actionable technical areas.

Clearly answers both what ('Vue 3 Composition API patterns that agents commonly get wrong' with specific list) AND when ('Use when building or reviewing Vue 3 apps') with explicit trigger guidance.

Includes good technical terms like 'Vue 3', 'Composition API', 'Pinia', 'composable' that developers would use, but missing common variations like 'Vue.js', 'vue app', 'reactive', 'ref', 'setup function', or file extensions like '.vue'.

Highly distinctive with clear niche - specifically targets Vue 3 Composition API patterns and common mistakes, unlikely to conflict with general JavaScript, React, or other framework skills due to specific Vue terminology.

The skill is lean and efficient, leading with WRONG vs RIGHT code patterns without explaining basic concepts Claude already knows. Every section provides actionable patterns without padding or unnecessary context about what Vue is or how frameworks work.

Fully executable TypeScript/Vue code throughout with copy-paste ready examples. Each pattern shows complete, working code with proper typing, not pseudocode. The WRONG vs RIGHT format makes correct usage immediately clear.

Clear sequences for multi-step patterns (composables with loading/error/success states, store setup with watch for side effects). The checklist at the end provides explicit validation checkpoints. Template handling shows the v-if/v-else-if/v-else chain explicitly.

Well-organized with clear section headers, a comprehensive checklist for quick reference, and external references to official documentation. Content is appropriately structured in one file since it's a cohesive set of related patterns, with no unnecessary nesting.