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.
import crafttweaker.entity.AttributeModifier;

ZenGetter	GetterMethod	반환 타입
ZenGetter uuid	GetterMethod getUUID()	반환 타입 string
ZenGetter name	GetterMethod getName()	반환 타입 string
ZenGetter operation	GetterMethod getOperation()	반환 타입 int
ZenGetter amount	GetterMethod getAmount()	반환 타입 double
ZenGetter saved	GetterMethod isSaved()	반환 타입 boolean

SetterName	SetterMethod	Parameter Type
SetterName saved	SetterMethod setSaved(boolean)	Parameter Type boolean

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for operation:
0 = add: Increment X by Amount
1 = multiply_base: Increment Y by X * Amount
2 = multiply: Y = Y * (1 + Amount) (equivalent to Increment Y by Y * Amount).

ZenScript
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AttributeModifier.createModifier(String name, double amount, int operation, @Optional String uuid);