Bukkit

Attributes

An entity's attributes can be set once and will effect many other sections, including the AI and custom actions. Any attribute has a default value, based on the type of the entity.

The Attribute class

Attributes will be determined by an Attribute class. Each attribute has a name, a minimum, maximum and basis value. Attributes can be manipulated by:

• changing the basis value
• or attaching AttributeModifiers.

You can see all that stuff in the javadoc, I won't explain too much here.

The AttributeModifier class

An AttributeModifier can be attached to an Attribute to manipulate its basis value. Modifiers can be attached or detached at any time. An AttributeModifier has a modifier value and a ModifyOperation. There are three modify operations:

1. adding to basis value
2. multiplying the result of the first operation and adding all modified values up
3. multiplying the result of the second operation

You can create an AttributeModifier using AttributeModifierFactory.create(). Make sure you use a hardcoded unique ID for each modifier! Again, everything is explained in the javadoc.

Managing attributes

You can change or retrieve attributes by using ControllableMob.getAttributes()

Here is a list of which attributes are available:

Interesting property: the maximum navigation distance. By default, Minecraft limits the distance entities will move to 16 blocks. You can change it over here.