Just as the title says. Is there a way to add steps to the validator without changing the existing source code?
The rig’s custom steps don’t have anything to do with pyblish as far as I know.
You can either trigger a pyblish run when the rig build is done - then you’d add the validator to your existing pyblish routine and launch it from python.
You can also imitate the behaviour of a pyblish validator in a post-step and notify the user if something is not correct.
Sorry I have to document the new features 
You can add validators in the pyblish_plugins folder inside mgear.shifter.rig_builder
It has one as an example 
2 Likes