First-principles thinking distilled into a Claude Skill that stress-tests your PRD

blaizedsouza · x · 2026-10-05

nurijanian released a Claude Skill called /first-principles that distills first-principles thinking into a reusable skill: paste it in, have Claude stress-test your PRD or roadmap decision, and watch fake certainty fall apart in real time. An accompanying article covers how PMs can apply first-principles analysis to complex, long-standing problems — and why Musk's physics-based examples don't transfer directly for most people.

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