Here is a simple python script for Houdini, OTLCheck
This script allows the user to check which sub-otl(s) are used inside a selected otl.
It checks all sur subchildren nodes and will print a list of otls and path in the console or in the python shell.
If the otl uses a uncomplete asset definition the script will output a warning:
WARNING: node <node path>, is embedded.
The script skips all otls lib built-in shipped with Houdini.