These are the frameworks I rely on inside my own work, turned into callable skills for Claude Code and Codex. Free. No signup. Adapt, fork, and improve. If they save you a meeting, send the link to a friend who needs it more.
Pressure-test a business idea, offer, or product strategy through Roger Martin and A.G. Lafley's choice cascade. 12-section output, Proceed/Narrow/Park/Kill verdict, no fluff.
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