Comment by solidasparagus

I used them for repeated problems or workflows I encounter when running with the default. If I find myself needing to repeat myself about a certain thing a lot, I put it into claude.md. When that gets too big or I want to have detailed token-heavy instructions that are only occasionally needed, I create a skill.

I also import skills or groups of skills like Superpowers (https://github.com/obra/superpowers) when I want to try out someone else's approach to claude code for a while.