No. You basically call a function to temporarily or permanently extend the base prompt. But of course you can think of other patterns to do more interesting things depending on your use-case. The prompt selection is a RAG.
Did some research and it's a bit more nuanced than this, though still RAG at its core: each skill has a name and brief description that's included verbatim into every prompt, and a Bash "cat" is triggered as a standard tool call to load the full skill specification from disk.
