Item Lock Mod

A client-side Fabric mod for Minecraft 1.21.1 that prevents accidental drops of hotbar items.

Features

• 🔒 Lock hotbar items (slots 1-9) to prevent dropping
• 💾 Persistent locks (saved between game sessions)
• 🎨 Visual lock indicator on items
• ⌨️ Quick toggle with keybind (default: L)
• 💬 Command-based control system
• ✅ Works with vanilla, modded, and custom server items
• 🎮 Compatible with Cobblemon and other mods

Commands

All commands are client-side only:

/lockitem lock              - Lock currently held item
/lockitem lock <1-9>        - Lock specific hotbar slot
/lockitem unlock            - Unlock currently held item
/lockitem unlock <1-9>      - Unlock specific hotbar slot
/lockitem toggle            - Toggle lock on held item
/lockitem list              - List all locked slots
/lockitem clear             - Unlock all items
/lockitem help              - Show help message

Keybind

• L - Quick toggle lock on currently held item

Installation

1. Install Fabric Loader 0.17.2+
2. Install Fabric API 0.116.6+
3. Download the mod JAR
4. Place in .minecraft/mods folder
5. Launch Minecraft 1.21.1

Configuration

Config file location: .minecraft/config/itemlock.json

The config automatically saves locked slots and will restore them on next launch.

How It Works

• Locks are slot-based (hotbar slots 0-8)
• Item fingerprint validation prevents accidental drops if items swap
• Drop attempts are blocked at the client level
• Visual indicators: 🔒 emoji overlay and tooltip
• Compatible with custom NBT items from servers