Lean and efficient throughout — it lists concrete items to model and concrete test cases without explaining basic programming or game concepts Claude already knows, so every token earns its place.

Provides concrete, specific guidance (enumerated model fields, an explicit transaction protocol, and a named list of test boundaries); for this instruction-only skill the absence of code is not penalized because the guidance is actionable.

The transfer section is a clearly sequenced 4-step process with explicit validation checkpoints ('Validate source ownership', 'Commit once or reject', 'Persist only after the committed state is valid') plus an error-prevention guard, matching the anchor for clear sequences with feedback loops.

A single-purpose skill under 50 lines with no need for external references, organized into four well-labeled sections; per the rubric's simple-skill guidance this scores 3 with just well-organized sections.

Lists multiple concrete actions — 'Build or repair game inventory, loot, equipment, tooltips, drag-and-drop, persistence, and progression systems' — matching the anchor for listing several specific concrete actions rather than vague language.

Explicitly answers both what ('Build or repair...systems') and when ('Use for item schemas, pickup flows...'), with an explicit 'Use for' trigger clause; not 2 because the when-guidance is explicit, not implied.

Covers natural terms a game developer would say ('loot', 'equipment', 'drag-and-drop', 'stack rules', 'save migration', 'pickups') with good breadth, matching the anchor for good coverage of natural terms.

A clearly scoped game-inventory niche with distinct triggers unlikely to overlap with unrelated skills; not 2 because the domain and trigger terms are specific rather than broadly overlapping.