The event is not cancelable.

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.forge.api.event.block.BlockToolModificationEvent;

BlockToolModificationEvent extends BlockEvent. That means all methods available in BlockEvent are also available in BlockToolModificationEvent

Name	Type	Has Getter	Has Setter	Description
Name context	Type UseOnContext	Has Getter true	Has Setter false	Description ​
Name finalState	Type BlockToolModificationEvent	Has Getter true	Has Setter true	Description Sets the transformed state after tool use. If not set, will return the original state. This will be bypassed if canceled, returning null instead.
Name heldItemStack	Type IItemStack	Has Getter true	Has Setter false	Description ​
Name isSimulated	Type boolean	Has Getter true	Has Setter false	Description ​
Name player	Type Player	Has Getter true	Has Setter false	Description ​
Name toolAction	Type ToolAction	Has Getter true	Has Setter false	Description ​