Yeah, after reading this I was thinking, "how is this different from agents using a combination of tools, resources, and prompts?" They do surprising things sometimes but it's not particularly novel of Claude Code.
i see it as skills being logical grouping of a set of prompts, which achieve a goal. Like my optimize-critical-path skill.
It's more than a single prompt, but less than an entire agent. I find skills to be the tools you use on the fly. Like how I might have a wrench,screw-driver, hammer in my tool box.
tools vs skills is all about context efficiency from what I see. and yes, this isn't novel of claude. but they are the first to offer this abstraction.
My point is that Skills are not the first to do this. Well written MCPs are dynamic workflow engines. Skills are like a more user focused and slimmed down version of MCPs.
It'd be interesting to see a comparison of a well written MCP compared to a skill in terms of task competency.
Now that you mention it, i can see a future where claude may offer a "skills" feature and codex offers a "talent" feature. where they are essentially the same things, but specific to that vendor.
reminds me how each cloud has the same offerings but different products.
