Created a local Codex skill named humanizer from the user-provided v2.5.1 draft.
Files created or updated:
/Users/samaguiar/.codex/skills/humanizer/SKILL.md/Users/samaguiar/.codex/skills/humanizer/agents/openai.yaml/Users/samaguiar/.codex/skills/humanizer/references/humanizer-v2.5.1.mdThe skill now describes when to use it, includes /humanizer as slash-command metadata, and preserves the complete original pattern library in a reference file for heavier edits.
Ran the official skill validator:
python3 /Users/samaguiar/.codex/skills/.system/skill-creator/scripts/quick_validate.py /Users/samaguiar/.codex/skills/humanizer
Result: Skill is valid!
Also read back the saved SKILL.md, agents/openai.yaml, and reference head to confirm the files landed where expected.
The generated validator rejects top-level slash_commands and aliases keys in SKILL.md. I adjusted by placing /humanizer in metadata.slash_command and in agents/openai.yaml default prompt. That keeps the skill valid while making the intended slash invocation explicit. Some older local skills still use top-level slash_commands, so there may be broader skill-registration drift worth cleaning up later.
The requested skill creation is complete and QA passed.
A future agent could test whether /humanizer appears immediately in the desktop slash picker after app refresh. If not, the next useful move is to inspect the current Codex slash-command registration path and update the skill metadata convention once, instead of patching individual skills repeatedly.
The durable source is the local skill folder above. The full pasted v2.5.1 content was intentionally preserved under references/humanizer-v2.5.1.md; the main SKILL.md is a compact loader so future /humanizer calls do not waste context unless the detailed checklist is needed. The validator passed after removing unsupported top-level slash keys. If slash UI discovery still fails, treat it as a registry-discovery issue, not a missing skill issue.