so, we only use kandy in notebooks? so only the -n version?

No, kandy doesn't have a "-n" version now.

And that works fine? Does it include DataFrame as compileOnly() now?

It works fine both in gradle and notebooks, but you need to add dataframe dependency first.
And no, DataFrame is included as implementation

So we need to ask user to %use dataframe before kandy!

What about adding something like this to our jupyter integration?

onLoaded {
    val alreadyLoadedKandy = try {
        execute("kandyConfig").value
        true
    } catch (_: Exception) {
        false
    }

    if (alreadyLoadedKandy) {
        display(
            "Kandy was found on the notebook classpath. When combined with DataFrame, make sure DataFrame is loaded first; then Kandy.",
            null,
        )
    }
}

I think something like that could prevent some confusion :)