alt Hacker NewsFrom my experience, most are just some high level instructions on how to use CLI tools installed on the system. A lot of the CLI tools they're calling out to have 0 reputation on Github or don't work at all.
I've had more luck writing my own skills using CLI tools I know and trust.
That's a big part of the reason skills are exploding, people use them as stealth marketing in addition to being a malware injection vector.