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build-game-inventory

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Build or repair game inventory, loot, equipment, tooltips, drag-and-drop, persistence, and progression systems. Use for item schemas, pickup flows, stack rules, equipment slots, atomic swaps, save migration, and no-loss regression testing.

agent-skills/game-development/build-game-inventory/SKILL.md

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# Build Game Inventory

Use one typed, serializable item source of truth and make every transfer atomic.

## Define the item contract

Model stable IDs, item definitions, ownership, stack limits, equipment compatibility, effects, rarity, presentation data, and migration version separately. Runtime UI must reference definitions by ID rather than duplicate stats or descriptions.

## Implement transfers as transactions

For pickup, equip, unequip, swap, drag/drop, consume, and sell:

1. Validate source ownership and destination legality.
2. Compute the entire next inventory/equipment state.
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