No. Nope. Agents do just fine with all sorts of CLIs. Old standards, new custom stuff, whatever.

The CLIs I’ve seen agents struggle with are those that wrap an enormous, unwieldy, poorly designed API under one namespace. All of Google Workspace apis, for example.

Which is perhaps why the author was focussing on optimising LLM usage of such unwieldy APIs without blowing out the context ?

I don’t disagree with your point about agent abilities with older, concise, well-represented-in-training-data tools though.