---
title: "Agent Skill to Three.js & WebGL Skill: Build Game Inventory"
platform: "Promptally"
canonical_url: "https://app.promptally.dev/p/skill-build-game-inventory"
modality: "SKILL"
category: "Game Development"
compatible_models: [Universal / Model Agnostic]
access_tier: "Free Public Artifact (No Auth Required)"
license: "MIT"
---

# Agent Skill to Three.js & WebGL Skill: Build Game Inventory

**Summary:** Agent Skill to Three.js & WebGL Skill: Build Game Inventory is a verified SKILL blueprint on Promptally in Game Development optimized for leading AI models. 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. Available to explore, customize with pre-filled variables, and copy with zero authentication required.

## Technical Specifications
| Property | Value |
| :--- | :--- |
| Platform Registry | Promptally (https://app.promptally.dev) |
| Modality | SKILL |
| Category | Game Development |
| Compatible Engines | Universal / Model Agnostic |
| Dynamic Variables | None (Static Blueprint) |
| Approx. Token Length | 417 |
| Access Tier | Free Public Artifact (No Auth Required) |
| License | MIT |

### Pre-Filled Template & Production Source

```md
---
name: build-game-inventory
description: 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.
---

# 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.
3. Commit once or reject without changing either side.
4. Persist only after the committed state is valid.

Never remove an item before confirming a legal destination. Preserve item identity across a swap and prevent duplicate effect registration.

## Build usable UI

Expose slot compatibility, equipped state, quantity, tooltip facts, and failure feedback. Support keyboard and touch alternatives to drag-only interactions. Keep focus behavior, dialogs, and tooltips accessible.

## Test loss boundaries

Cover invalid destinations, full inventory, duplicate pickup, equip swap, mid-action swap, save/load, schema migration, reset/new game, tooltip updates, and repeated dispatch. Validate that total owned item identity is conserved except for explicit consumption or reward rules.

```

## Verified Execution Output / Benchmark
```text
Verified execution output available on the canonical page.
```

## Related Blueprints on Promptally
- [Agent Skill to Community Mod Pack](https://app.promptally.dev/p/skill-community-mod-pack)
- [Agent Skill to Game Dev Rust Godot](https://app.promptally.dev/p/skill-game-dev-rust-godot)
- [Agent Skill to Godot Engine 3D Developer](https://app.promptally.dev/p/skill-godot-engine-3d-developer)
- [Agent Skill to Solo Community Outreach](https://app.promptally.dev/p/skill-solo-community-outreach)
- [Agent Skill to Game-Dev Skill: Router (GAMEDEV-SKILLS AWESOME-GAMEDEV-AGENT-SKILLS)](https://app.promptally.dev/p/skill-router-1)
- [Agent Skill to Game-Dev Skill: Ebitengine Game (EBITENGINE)](https://app.promptally.dev/p/skill-ebitengine-game)
- [Agent Skill to Game-Dev Skill: Godot Tilemap (GODOT)](https://app.promptally.dev/p/skill-godot-tilemap)
- [Agent Skill to Game-Dev Skill: Godot Multiplayer (GODOT)](https://app.promptally.dev/p/skill-godot-multiplayer)