There is none (interface, that is).
There is a simple standalone version but it can not accept command line arguments nor return any status.
I had wanted a way to use it with Kiwidude's Calibre PI: Openwith
and have it return (to be logged): #fail's(red), #warnings (yellow) 3F, 2W
or simply Pass/Fail/Abort if the counts were to complex.
The purpose: to help prioritize my EPUB cleanup efforts