This is internal plumbing for the Codex Claude Code plugin. It teaches Claude how to write tight, structured prompts for GPT-5.4 when Codex needs help with coding, debugging, or research tasks. The main idea is treating Codex like an operator, not a collaborator: use XML tags, define explicit output contracts, add verification loops for risky work, and skip the conversational padding. You get prompt recipes for common jobs like adversarial review or implementation tasks, plus a checklist to avoid vague nudges and unsupported guesses. Not user-invocable, so you won't call this directly. It's the meta-layer that keeps automated Codex calls crisp and grounded.
npx skills add https://github.com/openai/codex-plugin-cc --skill gpt-5-4-prompting