Mob Brain Additions

Mob Brain Additions

This API can be used by other mods to give additional functionality to mobs that use the brain system.

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About this Mod

Mob Brain Additions

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.

Current features

Blocks

  • a new (operator only) "Path Finding Node" block, which can save a map of strings and block positions

Memory Types

  • "mob_brain_additions:is_near_home", a unit memory type

Sensor Types

  • "mob_brain_additions:is_near_home", a sensor type that sets the "mob_brain_additions:is_near_home" memory type when the entity is within a configurable radius of its home position. If the entity is further away the "mob_brain_additions:is_near_home" memory type is removed, along with the vanilla walk_target and attack_target memory types
  • "mob_brain_additions:update_home_from_path_finding_block", a sensor type that sets home position of an entity according to a nearby "Path Finding Node Block". The Path Finding Node Block has block positions mapped to strings. If the entity is an instance of the "TracksPathFindingNodes" interface, it has a "trackedPathFindingNodeId", which is used to determine which of the block positions of the node block is set aas its new home position.

Behaviours

  • the "SetWalkTargetToHomePosition" behaviour sets the look_target and walk_target memories to the home position of the entity
  • the "TargetOrRetaliateWhenNearHome" behaviour works very similar to the existing "TargetOrRetaliate" behaviour, but it only runs when the entity has the "mob_brain_additions:is_near_home" memory. Additionally, the target has to be near the entities home position. The maximum distance is configurable.

Available Versions

1.0.0release
MC 1.21.1fabric
March 29, 2026

How to Install Mob Brain Additions on Your Server

1

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

2

Set fabric Loader

In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.1).

3

Install Mod

Open the mod browser in the dashboard and search for "Mob Brain Additions". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

fabric

Minecraft Versions

1.21.1

Server-side

Unsupported

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

Mob Brain Additions server crashes on startup – what to do?

Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.1). You can switch loaders with one click in the panel.

Is Mob Brain Additions compatible with fabric?

Mob Brain Additions officially supports fabric for Minecraft 1.21.1. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with Mob Brain Additions – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Mob Brain Additions consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.

Rent Modded Server

Install Mob Brain Additions with just one click on your server.

Recommended RAM
4 GBab €8/mo
Min. 3 GB | +1 GB pro 8 Spieler
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NVMe SSD Storage
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Details

License
MIT License
Server-side
Unsupported

Supported Versions

1.21.1