I just discovered that many homalg-project packages now live in two repositories, one inside a multi package repository and once in a "subsplit" repository created from the former. I have tools which I use to clone all packages in gappackages and homalg-project and a few other places. I'd like to adjust these tools to not clone the "subsplit" repositories. For this it would be helpful if my code could determine whether a repo is subsplit or not automatically.

An easy way to achieve that would be to add a common "topic" to these, e.g. "subsplit-repository". Then it's easy to filter these out.

Another way would be to archive or delete these repositories ;-) but I assume you have some need to keep them around.