So these skills are effectively JIT context injections. Is that about right?

From the docs:

"Skills work through progressive disclosure—Claude determines which Skills are relevant and loads the information it needs to complete that task, helping to prevent context window overload."

So yeah, I guess you're right. Instead of one humongous AGENTS.md, just packaging small relevant pieces together with simple tools.

Yes, that's a good way of describing them.

It's all jit context

Yes