I've noticed that when writing an annotation processor in a kotlin project and then consuming it in a sibling project, the processor is not visible when kapt runs. I've been able to repro this behavior on a couple of projects, both android and java

Then it would be very nice if you file an issue to our issue tracker :) kotl.in/issue

will do. So this isn't expected? Because I can't even get the JB samples to work on newer versions of kotlin/gradle it seems 😐

Not, this is not expected.