Estimate market, segment, or opportunity size with transparent assumptions and uncertainty. Use for TAM/SAM/SOM, sizing scenarios, or comparing the scale of possible opportunities.
Install
npx skills add openai/plugins --skill market-sizingnpx skills add openai/plugins --skill market-sizing -a claude-code -gnpx skills add openai/plugins --skill market-sizing -a codex -ggemini skills install https://github.com/openai/plugins.git --path plugins/data-analytics/skills/market-sizinggh skill install openai/plugins market-sizinggit clone --depth 1 https://github.com/openai/plugins /tmp/openai__plugins
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/openai__plugins/plugins/data-analytics/skills/market-sizing ~/.claude/skills/market-sizing # Claude Code
cp -R /tmp/openai__plugins/plugins/data-analytics/skills/market-sizing ~/.agents/skills/market-sizing # Codex, Cursor, Gemini CLI, Copilot, OpenCode