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If what you mean is “do the public signatures of the classes in the apiElements configuration form a closed set with no dangling outgoing edges” then there is nothing built-in that I’m aware of. I think BND tools can do this but using it might be overkill for what you want.

If you mean to ensure that your don't use 3rd party libs your API while having them as implementation dependencies, you should have a look at https://github.com/autonomousapps/dependency-analysis-android-gradle-plugin

thanks for pointer, I will check that out!