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Judgment Training (Naval)

Guides the agent to reason from first principles and apply mental models for direction and credibility questions

Source Download skill
Repository
kangarooking/cangjie-skill
Stars
11,998
Licence
MIT
Files
3 files

What it does

This is a reading-based thinking guide, distilled from Naval Ravikant's book. Once installed, when you ask the agent to help judge a long-term direction, assess whether an expert's claim is credible, or improve your decision-making, it works through the problem by checking whether the reasoning can be rebuilt from basic principles and by applying mental models such as compounding, principal-agent problems, falsifiability and black swans. It also flags claims that sound impressive but cannot be derived from fundamentals.

Great for

  • People facing a big strategic or life decision who want a structured way to think it through
  • Anyone evaluating whether a claim or expert is genuinely knowledgeable
  • Students or learners building judgment in an unfamiliar field

Skip it if

  • Quick, concrete execution tasks: the skill itself says to act first and reflect later, and it adds unnecessary deliberation (reason: it is meant for direction-setting, not step-by-step work)
  • Simple factual lookups, where a full first-principles derivation is unnecessary

Try asking

  • “Help me judge whether it's worth switching careers into data science”
  • “Is this expert's claim about intermittent fasting credible? Break down what they actually know”
  • “I want to build better judgment about investing. Which mental models should I learn first?”
  • “Check whether my reasoning for launching this product holds up from first principles”
Step-by-step guide: how to use Judgment Training (Naval)Install, first run, examples, tips and FAQs

Install in 3 steps

  1. 1

    Download the skill

    The ZIP contains the 3 original files, the MIT licence and an attribution note.

    judgment-training.zip
  2. 2

    Add it to your agent

    Claude Code (all projects)

    mkdir -p ~/.claude/skills && unzip judgment-training.zip -d ~/.claude/skills/

    Claude Code / Agent SDK (this project only)

    mkdir -p .claude/skills && unzip judgment-training.zip -d .claude/skills/

    Claude apps (web/desktop): Settings → Capabilities → Skills → Upload skill, and choose the ZIP.

  3. 3

    Ask for the task

    No special command needed — the agent reads the skill's description and loads it when your request matches. Try one of the prompts above.

Get better results

  • State the decision and its time horizon clearly so the agent can judge whether consequences are long-term
  • Ask the agent to name which mental models it applied and where they may not fit your situation
  • Pair it with related skills it mentions (decision-heuristics, principal-agent) for more concrete rules

What's inside

  • SKILL.md
  • test-prompts.json
  • test-results.md

Redistributed unmodified from kangarooking/cangjie-skill under the MIT licence. The assessment was drafted with AI from the skill's files on 2026-10-29. Skills can instruct your agent to run code — read SKILL.md and any scripts before installing.