Get a second opinion from OpenAI Codex CLI for plan reviews, code reviews, architecture decisions, and hard problems. Use when you need external validation, want to compare approaches, or are stuck on a difficult problem.
Install
npx skills add ckorhonen/claude-skills --skill codex-advisornpx skills add ckorhonen/claude-skills --skill codex-advisor -a claude-code -gnpx skills add ckorhonen/claude-skills --skill codex-advisor -a codex -ggemini skills install https://github.com/ckorhonen/claude-skills.git --path skills/codex-advisorgh skill install ckorhonen/claude-skills codex-advisorgit clone --depth 1 https://github.com/ckorhonen/claude-skills /tmp/ckorhonen__claude-skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/ckorhonen__claude-skills/skills/codex-advisor ~/.claude/skills/codex-advisor # Claude Code
cp -R /tmp/ckorhonen__claude-skills/skills/codex-advisor ~/.agents/skills/codex-advisor # Codex, Cursor, Gemini CLI, Copilot, OpenCode