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first-principles

🔌Plugin

chrisdavidson/first-principles-skill

What it does

A Claude Code plugin: the 5-phase first-principles methodology plus 13 namespaced skills — 8 companion-technique skills (Five Whys, pre-mortem, trade-off analysis, fishbone, inversion, second-order thinking, estimate, theoretical-limit) and 5 focused-phase skills (identify-essence, challenge-assumptions, ground-truths, reason-upward, validate). Use when reasoning from ground truths rather than analogy or convention.

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Part of

chrisdavidson/first-principles-skill

reasoning

Installation

Add marketplace in Claude Code:

/plugin marketplace add chrisdavidson/first-principles-skill

Step 2. Install plugin:

/plugin install first-principles@first-principles-skill

AddedJul 17, 2026

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chrisdavidson/first-principles-skill🏪Marketplace

Claude Code plugin for systematic first-principles thinking — a 5-phase methodology (identify essence, challenge assumptions, establish ground truths, reason upward, validate) plus 13 companion skills; every conclusion traces back to a verified ground truth.