Imagine the project has already shipped and failed catastrophically — work backwards from the failure to identify the most likely causes BEFORE building. Forces concrete risk identification, not vague "what could go wrong" lists.
Install
npx skills add avelikiy/great_cto --skill pre-mortemnpx skills add avelikiy/great_cto --skill pre-mortem -a claude-code -gnpx skills add avelikiy/great_cto --skill pre-mortem -a codex -ggemini skills install https://github.com/avelikiy/great_cto.git --path skills/pre-mortemgh skill install avelikiy/great_cto pre-mortemgit clone --depth 1 https://github.com/avelikiy/great_cto /tmp/avelikiy__great_cto
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/avelikiy__great_cto/skills/pre-mortem ~/.claude/skills/pre-mortem # Claude Code
cp -R /tmp/avelikiy__great_cto/skills/pre-mortem ~/.agents/skills/pre-mortem # Codex, Cursor, Gemini CLI, Copilot, OpenCode