Mob Brain Additions
by TheRedBrain
Mob Brain Additions is a Fabric library that gives mods new behaviours and memory types for the brain system that controls mob decisions in Minecraft.
What it does
The library exposes an API that other mods can use to extend the brain system mobs run on. Mods that depend on it can attach additional behaviours, so their mobs act on extra goals without each mod rewriting the underlying logic. It is an extension layer rather than a finished gameplay addition, and its effects appear only where another mod uses its API.
Its bundled behaviours include SetWalkTargetToHomePosition, which sets a mob's look target and walk target from a stored home position memory, and a check that tests whether a mob is near its home. A Path Finding Node block is also included, which saves map strings and block positions for mobs to use. The mod requires Fabric API, Fzzy Config and SmartBrainLib, and it builds on SmartBrainLib's expanded version of the vanilla brain system.
The 1.0.0 build was released on 2026-03-29 under the MIT License, and the code is open source with public source and issue tracker links. It requires Fabric API, Fzzy Config and SmartBrainLib.
Key features
Brain system API
Other mods can hook into the brain system to add behaviours and memory types to mobs.
Home position behaviour
SetWalkTargetToHomePosition sets walk and look targets from a stored home position memory.
Near-home check
A condition tests whether a mob is near its home position memory, so behaviours can branch on it.
Path Finding Node block
A block saves map strings and block positions that mobs can read during path finding.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 3
Use cases
Mod developers
Developers building mobs with the brain system can use the shared API and the bundled behaviours instead of writing them from scratch.
Mobs that return home
Mobs that should stay near a set spot can use the home position behaviour and near-home check.
Who it’s for: Mod developers who want to add brain-driven behaviours to mobs, and players who use mods built on this library and want to know what it needs to run.
Questions
Does Mob Brain Additions need Fabric API?
Does Mob Brain Additions work on Forge or NeoForge?
Does the server need Mob Brain Additions?
In the catalog
Mob Brain Additions is one of 3,514 Library mods on ModsFinder, and one of 2,348 Library mods for Fabric. 32,366 mods support Minecraft 1.21.1.
More from TheRedBrain
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What the author says
This API can be used by other mods to give additional functionality to mobs that use the brain system. It depends on the SmartBrainLib mod, which implements an optimised and expanded version of the vanilla brain system.
Official listing
- Modrinth page
- modrinth.com/mod/mob-brain-additions
- Owner
- TheRedBrain
- Published
- 2026-03-29
- Updated on Modrinth
- 2026-03-29
- Facts verified
- 2026-10-15