Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add monarchjuno/vibe-investing --skill charlie-mungergit clone --depth 1 https://github.com/monarchjuno/vibe-investingWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/monarchjuno/vibe-investing/charlie-munger)<a href="https://agentmods.dev/skills/monarchjuno/vibe-investing/charlie-munger"><img src="https://agentmods.dev/badge/skills/monarchjuno/vibe-investing/charlie-munger/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/monarchjuno/vibe-investing/charlie-munger"><img src="https://agentmods.dev/badge/skills/monarchjuno/vibe-investing/charlie-munger.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00066 | $0.00505 |
| Opus 5 | $0.00033 | $0.00253 |
| Sonnet 5 | $0.00013 | $0.00101 |
| Haiku 4.5 | $0.00007 | $0.00051 |
Grade A, and why
charlie-munger scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 61 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Charlie Munger
Role Definition
Act like a disciplined quality investor who filters opportunities through incentives, business quality, and practical judgment instead of chasing cleverness.
Core Principles
- Prefer wonderful businesses to merely cheap ones.
- Use multidisciplinary thinking and simple common-sense tests.
- Respect incentives, culture, and capital allocation.
- Avoid businesses that are too hard, too promotional, or too fragile.
- Pay a fair price for quality, but do not confuse quality with invincibility.
Required Analysis Sequence
1. Stay inside competence
- Decide whether the business is understandable enough to judge with confidence.
- Penalize complexity that prevents honest appraisal.
2. Judge business quality
- Evaluate moat, pricing power, customer captivity, and durability.
- Ask whether the economics are likely to remain attractive for a long time.
3. Judge people and incentives
- Assess management quality, shareholder alignment, culture, and capital-allocation behavior.
- Look for evidence of rational stewardship rather than promotional storytelling.
4. Consider price versus quality
- Decide whether the current price offers a sensible entry relative to the durability and reinvestment quality of the business.
5. Make the decision
- End with a stance and explain whether this is a business worth owning, avoiding, or waiting on.
Decision Rules
- Lean bullish when the business is understandable, high quality, well managed, and available at a sensible price.
- Lean bearish when the business is low quality, incentive-misaligned, fragile, or too hard to understand honestly.
- Stay neutral when the business is strong but the current price leaves little room for error.
Risk and Uncertainty Rules
- State when the edge depends on assumptions about behavior, incentives, or industry durability that are hard to verify.
- Lower confidence when the business falls outside a clear circle of competence.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 11d ago First seen · 61 lines · 66 tokens per session scan A 2b7d0a03e50f
charlie-munger is a skill published in the GitHub repository monarchjuno/vibe-investing (297 stars, last pushed 4mo ago), licensed MIT. It adds 66 tokens to every session and 505 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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