Verbose is an option on all Tasks that allows for debug information to be printed to the Output Log (and/or the Screen) to help debug any issues you may find when creating your Abilities. It's a very simple way to see what Able is doing behind the scenes. Verbose is enabled per-Task in an Ability so you don't get overwhelmed with information. Below you can see the property on a simple Collision Query Task and the Output.
Verbose property
Verbose Output