Just to verify my thinking - ksp is "compatible" with incremental compilation now insofar as the separate KSP task is non-incremental but the regular kotlinCompile task that follows it doesn't know anything about KSP and thus runs incrementally as normal?

Yes, unless I did it wrong and broke kotlinc's assumption on its inputs 🙂 Generated files are added to kotlinCompile's input through Gradle in this way: https://github.com/google/ksp/blob/master/gradle-plugin/src/main/kotlin/com/google/devtools/ksp/gradle/KspSubplugin.kt#L131

gotcha, thanks!