Estimate market opportunity (TAM, SAM, SOM) using multiple sizing frameworks (top-down, bottom-up, comparable company, analogous market). Triangulates across frameworks, highlights where they converge and diverge as signal, and produces a calibrated range with source-graded confidence labels. Refuses unbounded fabrications; always offers a labeled lower-confidence path when data is thin.
Install
npx skills add product-on-purpose/pm-skills --skill discover-market-sizingnpx skills add product-on-purpose/pm-skills --skill discover-market-sizing -a claude-code -gnpx skills add product-on-purpose/pm-skills --skill discover-market-sizing -a codex -ggemini skills install https://github.com/product-on-purpose/pm-skills.git --path skills/discover-market-sizinggh skill install product-on-purpose/pm-skills discover-market-sizinggit clone --depth 1 https://github.com/product-on-purpose/pm-skills /tmp/product-on-purpose__pm-skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/product-on-purpose__pm-skills/skills/discover-market-sizing ~/.claude/skills/discover-market-sizing # Claude Code
cp -R /tmp/product-on-purpose__pm-skills/skills/discover-market-sizing ~/.agents/skills/discover-market-sizing # Codex, Cursor, Gemini CLI, Copilot, OpenCode