What does the

ToolingModelBuilderRegistry

do

A registry of tooling model builders. Adding a builder to this registry makes a model (or models) available via the tooling API.

so probably something like android studio needs android specific data so they likely register something custom there to make the integration work. smells like open/closed principle for tooling API

Do you think I can access the compilerArguments from there?

looks like you would register a model builder with gradle, then use the getModel on the connection to retrieve it

@trevjones Thank you I will try one of them