Hey @shocko
I did some digging around in our docs and couldn't locate what you are looking for. We do however document exit codes/call responses for the Snap Center API. So I am not sure if it might simpler for you to leverage the API instead for your automation needs. More info here - https://docs.netapp.com/us-en/snapcenter/sc-automation/overview_rest_apis.html
You may try contacting Support to see if they have that information, but I suspect support would be checking the same areas I did.
I have also passed along feedback to consider adding the exit code/returns summary to the Command Reference guides.