I had more success starting from scratch. Especially claude's skill-creator skill, it micromanages, which is in fact worse for 5+ models than just leaving the instructions out and crossing your fingers.

Start from scratch, do some test runs, find the bugs, add the minimal possible text to avoid the bug, iterate

You can get 95% of my impl workflow skill by just telling Claude "split the work into slices and use ephemeral subagents" and the other 5% takes like 10x as much text to achieve