AnvilUpdateEvent is fired when the inputs (either input stack, or the name) of an anvil are changed. You can listen to this event to add custom anvil recipes.

The event is cancelable.

If the event is canceled, vanilla behavior will not run, and the output will be set to <item:minecraft:air>.

If the event is not canceled, but the output is not empty, it will set the output and not run vanilla behavior.

The event does not have a result.

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.

ZenScript
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import crafttweaker.api.event.MCAnvilUpdateEvent;

MCAnvilUpdateEvent extends MCEvent. That means all methods available in MCEvent are also available in MCAnvilUpdateEvent

Name	Type	Has Getter	Has Setter	Description
Name left	Type IItemStack	Has Getter true	Has Setter false	Description No Description Provided
Name levelCost	Type int	Has Getter true	Has Setter true	Description No Description Provided
Name materialCost	Type int	Has Getter true	Has Setter true	Description No Description Provided
Name name	Type string?	Has Getter true	Has Setter false	Description No Description Provided
Name output	Type IItemStack	Has Getter true	Has Setter true	Description No Description Provided
Name player	Type MCPlayerEntity?	Has Getter true	Has Setter false	Description No Description Provided
Name right	Type IItemStack	Has Getter true	Has Setter false	Description No Description Provided