Looks very similar. That's good - diversity and more options are good.

But ... as the author and maintainer of Ruler I can tell you that I don't use it and I don't recommend using it (or this new tool).

In almost all cases it isn't necessary anymore - most agents support AGENTS.md (or at least a hack like `@AGENTS.md` in CLAUDE.md), and Agent Skills are the best way to customise agents and are available everywhere now.

There are some corner cases where using a tool like Ruler may still make sense, but if in doubt, you probably don't need it.