How would I use KSP in a gradle plugin to generate additional code based on annotations? I was working with an IR plugin before, but generating code instead of IR seemed better suited for my use case.

1. Implement ksp processor as a separate module 2. Apply ksp plugin 3. Add your processor to the relevant ksp configuration

If OP means applying KSP in another Gradle plugin programmatically, I think it should work.

Yeah it's supposed to add some functions to a K/N project, to be specific I'm aiming to make a plugin that just allows marking a class with @PyExport and it'll generate the staticCFunctions and such for use with the Python C API.

KSP allows processors to visit all files / classes / etc. It doesn't require them to be marked with any annotation to be processed. So in your use case it might be possible to just use KSP without a customized plugin.

I mean I still need it to be bundled in the plugin, how else would you apply it? It also should only export things marked by the annotation so I'll need to figure out some way to check for them anyway

You don't, you publish both, plugin and processor as separate artefacts. Gradle will then download both when applied

Do you have an example project so I can see how it's made and used?

Not ksp, but the idea is the same github.com/mpetuska/klip

And do you have an example KSP project to see how I'd go about generating large amounts of source code based on annotations? And would I still need to write a kotlin compiler plugin or does KSP work differently?

Ksp processor kinda IS a compiler plugin. Just with stable api and read-only source access