No
The results were identical
nottorp on Hacker News
In the thread “Claude Code reduces it's weekly limit by 17% – compared to today”, replying to this comment
Got in the way: Skill files did not change the refactoring plan output.
… Some coworker was pestering me about some brilliant skill file so i backed up Claude's state and told it to make a plan for some refactoring task with and without those skills installed. The results were identical. I didn't measure token use though.