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tt-a1i/archify (MIT, 57k stars) turns a typed JSON spec into validated, self-contained interactive HTML diagrams (architecture / workflow / sequence / dataflow / lifecycle) with a 9-check validate/deliver receipt, Mermaid import and PNG/SVG/WebM export. The upstream repo already ships a complete skill directory (archify/), so this follows the impeccable pattern: a catalog stub whose metadata.hermes.upstream pointer makes `hermes skills install official/creative/archify` pull the live tree through OptionalSkillSource._fetch_from_upstream. Nothing executable is vendored and the copy can never go stale. Docs: generated page, one catalog row, one sidebar line. Credit: tt-a1i (upstream author). Supersedes the vendored-references port in #106442.