ModsFinder

Stealth and Alert

by RedGhostRev

Stealth and Alert gives hostile mobs a perception system, so they notice, search for and investigate a player instead of tracking them through walls.

NeoForgeClient and serverMIT LicenseOpen source1.21.1

What it does

Mobs with an added entity tag move through Idle, Suspicious, Searching and Fighting states, and their field of view changes as they shift between them. An in-world alert symbol with its own animation shows when a mob has spotted a player, and a circular HUD around the crosshair tracks enemy positions with White, Yellow and Red alert levels.

Sound plays a part in detection: noise a player makes can draw enemies, and throwables such as pebbles can be used to pull them away from a position. When a mob loses sight of a player, it heads to the last known position rather than knowing where the player is. The mod separates a mob's overall alertness from its observation of a specific player, so the detection flow stays logical.

The mod needs playerAnimator on NeoForge for 1.21.1, and it runs on client and server, so the server and every player need it. Source code is public under the MIT License. Assassinations and corpse discovery are described by the author as planned updates.

Key features

  1. Perception AI

    Tagged mobs move through Idle, Suspicious, Searching and Fighting, with a field of view that shifts between those states.

  2. Circular alert HUD

    A ring around the crosshair shows enemy positions and their White, Yellow or Red alert level.

  3. In-world alert symbols

    Mobs display specific symbols and animations to show that they have seen the player.

  4. Sound and throwables

    Noise made by the player draws enemies, and pebbles or other throwables can lure them away.

  5. Last known position

    Rather than knowing where the player is at all times, mobs head to the place they last spotted the player and look around there.

Compatibility

Latest build for each game version and loader.

1.21.10.1.2-beta.6
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Requirements

Dependencies declared by the latest file for each loader.

Required 1

PL
playerAnimatoranimate the player
Required

Use cases

Stealth play in survival

Players who want enemies to react to sight and sound rather than knowing their location can use the mod to approach mobs carefully.

Who it’s for: Players who want tactical stealth in a Minecraft world, and server owners who want enemies that react to what they see and hear. Anyone running the mod on a server needs playerAnimator installed beside it.

Questions

Does Stealth and Alert need playerAnimator?

Yes. playerAnimator is a required dependency, so it must be installed on NeoForge alongside Stealth and Alert for 1.21.1.

Does the server need the mod as well?

Yes. Servers that run it need every player to install it too.

Which mobs use the perception system?

Only mobs that carry the added entity tag use the new states. Other mobs keep their default behavior.

In the catalog

Stealth and Alert is one of 19,031 Adventure mods on ModsFinder, and one of 8,588 Adventure mods for NeoForge. 32,366 mods support Minecraft 1.21.1.

Adventure mods19,031NeoForge modsMods for 1.21.132,366

Similar mods

Sound Physics Remastered1.19 – 26.3Advancement Plaques1.12.2 – 26.3JourneyMap1.7.10 – 26.3Exposure1.19.2 – 1.21.1Boat Item View1.16.5 – 26.3Shoulder Surfing Reloaded1.7.10 – 26.3

What the author says

The mod is new. There maybe many bugs and feel free to report them. More mechanics are under development. Stealth & Alert introduces a tactical stealth system to Minecraft, inspired by the perception mechanics of some games like Assassin's Creed.
RedGhostRev, on the Modrinth page

Official listing

Owner
RedGhostRev
Published
2026-04-18
Updated on Modrinth
2026-08-08
Facts verified
2026-10-15

Tags

AdventureGame mechanics
Open on ModrinthCompare