A Claude skill is invisible to Codex — the dialects don't even agree on field names. Author a tool once as files, and serve it to every agent.
Disclosure up front: I build agentproto, whose spec
registry (the AIPs) is the last third of this piece. The problem in the first
half stands on its own, and the walkthrough uses real, checkable commands.
Corrections welcome — file an issue.
You spent an afternoon writing a good skill. A SKILL.md, a couple of scripts,
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