EyeSpy

When a hostile mob locks onto the player, EyeSpy gives it a glowing outline. The colour follows the mob's threat category, so a player can tell a zombie from a pillager or a ravager without stopping to look. The outline is applied only to mobs that are targeting the player, which keeps the rest of the scene unchanged. Instead of scanning dark corners for movement, the player sees which mobs are angry as soon as they become a danger.

The mod is handy at night, when visibility is low, and while exploring caves, raiding structures or surviving fights where several mobs pile in at once. On multiplayer servers, players who share a view of the same targeted mob can see whether everyone is focused on one player, which makes a rescue easier to coordinate or a safe retreat easier to call. EyeSpy runs on the client side only: it needs to be installed by each player, and the server does not need it.

The mod is published for Fabric alone, with a single game version: 1.21.11. The latest file is 1.0.2 for 1.21.11, released on 2026-01-01. It does not change mob AI, damage or loot; it only highlights targets. EyeSpy is released under All rights reserved and is not open source.