Review a finished coding session for what slowed the agent down or let a mistake through, and turn one lesson into a test, check or doc in the project so the next session does not repeat it. Use when the user asks for a retro or retrospective, a post-mortem of a session, or "what should we change so this doesn't happen again".
Install
npx skills add ehnruiz/claude-skills --skill retronpx skills add ehnruiz/claude-skills --skill retro -a claude-code -gnpx skills add ehnruiz/claude-skills --skill retro -a codex -ggemini skills install https://github.com/ehnruiz/claude-skills.git --path skills/retrogh skill install ehnruiz/claude-skills retrogit clone --depth 1 https://github.com/ehnruiz/claude-skills /tmp/ehnruiz__claude-skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/ehnruiz__claude-skills/skills/retro ~/.claude/skills/retro # Claude Code
cp -R /tmp/ehnruiz__claude-skills/skills/retro ~/.agents/skills/retro # Codex, Cursor, Gemini CLI, Copilot, OpenCode