Is the Mental Models skill free?

Yes. The skill itself is free from cyperx84/claude-skills-mental-models. SkillProof publishes the install command and an independent test verdict at no cost.

What is the Mental Models SkillProof Score?

9.2/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 8/10, docs & honesty 5/5.

How do I install Mental Models?

Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.

Can I use Mental Models with Cursor, Copilot, Gemini CLI, Codex or other AI tools?

The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.

Mental Models

Applies Charlie Munger's 98-model latticework to decisions, with a CLI or offline file fallback.

by cyperx84 · cyperx84/claude-skills-mental-models

Tested · Works

Install — copy the command Download source ↗

Test report

Verdict: Tested · Works
Score: 9.2/10
Tested: Jul 16, 2026
Environment: Claude Code 2.x (agent harness)
Upstream re-checked: Aug 10, 2026 · a6664dd

Ran the file-fallback path on a real 'team keeps missing deadlines despite overtime' problem: it surfaced a reinforcing burnout feedback loop and an incentive-bias check that my unaided baseline answer never named, then ended with concrete next steps instead of theory.

Scored on four weighted criteria — install, triggering, output vs. baseline, docs. How scoring works

Installs cleanly 5/5
Triggers reliably 5/5
Output vs. baseline 8/10
Docs & honesty 5/5

What Mental Models does

Selects 2-3 relevant mental models (bottlenecks, feedback loops, incentive bias, etc.) for a user's problem and walks their thinking_steps verbatim to structure an analysis. Triggers on decision-analysis requests, 'help me think', named models (inversion, bottlenecks), or requests for a structured reasoning framework. Prefers a companion CLI but ships all 98 model files plus REFERENCE.md/PATTERNS.md so it works fully offline.

How to install Mental Models

git clone https://github.com/cyperx84/claude-skills-mental-models
mkdir -p ~/.claude/skills
cp -r claude-skills-mental-models/.claude/skills/mental-models ~/.claude/skills/mental-models

Skills live in ~/.claude/skills/ (global) or .claude/skills/ (per-project). Restart Claude Code after installing.

Commands — how to trigger Mental Models

/mental-models Applies Charlie Munger's 98-model latticework to decisions, with a CLI or offline file fallback.

It also activates on plain-language prompts like these:

Help me think through why my team keeps missing deadlines
Use Charlie Munger's latticework of frameworks on this hiring call
Use inversion to figure out what could kill this product launch

Frequently asked questions

Is the Mental Models skill free?: Yes. The skill itself is free from cyperx84/claude-skills-mental-models. SkillProof publishes the install command and an independent test verdict at no cost.
Does Mental Models work with Claude Code?: We tested it with Claude Code 2.x (agent harness) on Jul 16, 2026. Verdict: Tested · Works. Ran the file-fallback path on a real 'team keeps missing deadlines despite overtime' problem: it surfaced a reinforcing burnout feedback loop and an incentive-bias check that my unaided baseline answer never named, then ended with concrete next steps instead of theory.
What is the Mental Models SkillProof Score?: 9.2/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 8/10, docs & honesty 5/5.
How do I install Mental Models?: Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.
Can I use Mental Models with Cursor, Copilot, Gemini CLI, Codex or other AI tools?: The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.