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Hey :slightly_smiling_face: For my library, I want to ensure that I don't accidently introduce source compatiblity AND binary compatibility changes. I know that there is binary-compat-validator. But are there any rules on what constitutes a source compatibiltiy break? I am willing to invest some time into this, but I would love to have a definite answer which changes break API.

I asked a related question some time ago <https://kotlinlang.slack.com/archives/C8C4JTXR7/p1639756709052300|there>. The tldr; is that it's not easy to add.
If you're JVM only, japicmp has some source compatibility checks but of course doesn't know much about Kotlin.
Once the recording goes out, I strongly recommend watching <https://kotlinconf.com/speakers/6b8c2666-a975-4a5f-9ee0-5f28f3e445ee/#Kotlin%20Multiplatform%20Conversions%20at%20Android%20Jetpack%20Scale|Kotlin Multiplatform Conversions at Android Jetpack Scale>  from <@U2245FK37> and <@UJBQ214TV>. They're talking how metalava, the tool google uses to check compatibility, could maybe help there in the future