InvSee

A small, server-side-only Fabric mod for Minecraft 1.21.11 that adds an /invsee command. A server owner can open another player's inventory as a live view, take items out of it, and put items into it.

The screen is rendered with a vanilla chest-style GUI, so players do not need to install this mod — it only needs to be present on the server.

Features

• /invsee <player> — open another player's inventory as a live view
• View and edit the target's main inventory, hotbar, armor, and offhand
• Changes apply instantly and sync to the target's client
• Server-side only; vanilla clients are fully supported
• No extra permissions system — just operator level 4 (OWNERS)

Requirements

• Minecraft 1.21.11
• Fabric Loader >= 0.17.3
• Fabric API 0.141.6+1.21.11 (or newer for 1.21.11)

Usage

As a server owner (operator level 4 / OWNERS):

/invsee <player name>

• The next row has their armor (head, chest, legs, feet) and offhand (left hand).
• Click/drag/shift-click items between them to move items in and out.
• Changes are applied to the target's real inventory immediately and synced to their client.

Notes

• The armor row is ordered head, chest, legs, feet, then offhand.
• For singleplayer/LAN testing, put the jar in your client's mods/ folder as well; it will load on the integrated server.