The unit is a folder plus SKILL.md: name, trigger, steps, bans. Without that file, a client will not load it as a skill.
Put the folder in a public git repo with a short, stable layout. Document which installer to use or which skills path to copy into.
Before you announce it, invoke it by name in Cursor or Codex and confirm it does not touch unrelated directories or commit secrets.
This directory only lists public metadata. To be eligible, you need a reachable project home and a description we can check — not an empty repo.