Read an industry's structure through Porter's Five Forces with documented signals per rating, ending at the profit pool. Use when weighing market entry or when margins erode and nobody can say why.
Install
npx skills add deanpeters/Product-Manager-Skills --skill porters-five-forcesnpx skills add deanpeters/Product-Manager-Skills --skill porters-five-forces -a claude-code -gnpx skills add deanpeters/Product-Manager-Skills --skill porters-five-forces -a codex -ggemini skills install https://github.com/deanpeters/Product-Manager-Skills.git --path skills/porters-five-forcesgh skill install deanpeters/Product-Manager-Skills porters-five-forcesgit clone --depth 1 https://github.com/deanpeters/Product-Manager-Skills /tmp/deanpeters__Product-Manager-Skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/deanpeters__Product-Manager-Skills/skills/porters-five-forces ~/.claude/skills/porters-five-forces # Claude Code
cp -R /tmp/deanpeters__Product-Manager-Skills/skills/porters-five-forces ~/.agents/skills/porters-five-forces # Codex, Cursor, Gemini CLI, Copilot, OpenCode