Self-Contained Content

Capture the information itself; never defer to an external source for it. Attribution citations are fine; the only learning pointers are cross-references.

A wskill must stand on its own: capture the substance here rather than deferring the reader to an outside source, which can't be projected or kept current (the validator flags the common deferral phrasings). Attribution for credit ("per RFC 9110") is fine, and pointers to further learning are cross-reference blocks to other wskills — never bare URLs in prose.