Heh, the problem with having a half drafted post on your machine for a few weeks is the industry moves fast!
I had the post pretty much done, went on vacation for a week, and Claude Skills came out in the interim.
That being said Skills are indeed an implementation of the patterns possible with linking, but they are narrower in scope than what's possible even with MCP Resources if they were properly made available to agents (e.g. dynamic construction of context based on environment and/or fetching from remote sources).
Totally agree, the web itself is absolutely HATEOAS, but there was a type of person in the 2000s era who insisted that APIs were not truly RESTful if they weren't also hypermedia APIs, but the only real benefit of those APIs was to enable overly generic API clients that were usually strictly worse than even clumsily tailored custom clients.
The missing piece was having machines that could handle enough ambiguity to "understand" the structure of the API without it needing to be generic to the point of uselessness.