Codex Skill Guide

Workflow

1. Confirm task mode:
   • New run: use codex exec.
   • Continue prior run: use codex exec ... resume --last with stdin prompt.
2. Set defaults unless user overrides:
   • Model: gpt-5.4.
   • Reasoning effort: ask user to choose xhigh, high, medium, or low.
   • Sandbox: read-only unless edits/network are required.
3. Build command with required flags:
   • Always include --skip-git-repo-check.
   • Add 2>/dev/null by default to suppress thinking tokens on stderr.
   • Show stderr only if user asks or debugging is needed.
4. Run command, summarize outcome, and ask what to do next.
5. After completion, remind user they can continue with codex resume.

Quick Reference