I started by designing all those files around last September-October timeframe. By November I was realizing: the AI knows better how to make those files than I do, so instead of writing SKILL.md or whatever, I describe to the agent what I want it to configure and explain to me how it's going to do it. It makes SKILL.md for me, I review it - correct the (usually few and far between) things that are misquoting my intent - and tell it to install it. In areas like softtware development that's been working pretty well, and getting more and more invisibly automated by the tools since then.
Claude Opus 4.8 dropped a few weeks back "best graphical understanding ever" - well, I'm trying to use it to do some Blender work, it sucks - it's worse at it than the code writers were in January 2025.
It can be like that, and other times it can spit out perfectly good work that similar jobs have taken me a week in the past in under an hour. Depends on the task, depends a bit on how you ask, and depends on the model. Claude Sonnet/Opus 4.5 and higher have gotten pretty good about actually saving time and producing useful results.
Except when trying to draw 3D cats in Blender, I can say with authority now: Opus 4.8 on High/Max thinking still can't pin the tail on a cat correctly without a half dozen very specific annotated views showing it where it goes. It claims it's having trouble because the cat is lying down... our cat lays down 22 hours a day, suck it up and learn what they look like already.