It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import at the very top of the file.

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import crafttweaker.api.entity.attribute.AttributeOperation;

AttributeOperation implements the following interfaces. That means all methods defined in these interfaces are also available in AttributeOperation

• StringRepresentable

AttributeOperation is an enum. It has 3 enum constants. They are accessible using the code below.

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<constant:minecraft:attribute/operation:add_value>
<constant:minecraft:attribute/operation:add_multiplied_base>
<constant:minecraft:attribute/operation:add_multiplied_total>

Name	Type	Has Getter	Has Setter	Description
Name id	Type int	Has Getter true	Has Setter false	Description Gets the id of this operation.