bft-skills

A collection of Claude Code skills built around Warren Buffett's investment framework.

Skills

`buffett` — Buffett Investment Thinking System

Activates Warren Buffett's complete investment thinking system. Covers the full workflow from quick screening to deep analysis, with structured output and industry-specific playbooks.

Triggers automatically when you:

Analyze any stock or company
Evaluate an investment opportunity
Read financial reports, annual letters, or shareholder letters
Judge a company's moat or competitive advantage
Assess management quality and integrity
Make buy / hold / sell decisions
Discuss value investing concepts (compounding, intrinsic value, margin of safety, circle of competence, Mr. Market)
Analyze specific industries (insurance, banking, consumer, media, energy, railroads, tech)
Handle capital allocation, buybacks, or dividends
Assess market sentiment or macro risk

No need to mention "Buffett" — any investment analysis or business quality question triggers the skill.

Installation

Clone this repo and copy the skills/buffett folder into your project:

git clone https://github.com/agi-now/buffett-skills /tmp/buffett-skills
cp -r /tmp/buffett-skills/skills/buffett your-project/.claude/skills/buffett

The skill must be placed at .claude/skills/buffett/SKILL.md relative to your project root:

your-project/
└── .claude/
    └── skills/
        └── buffett/          ← this folder
            ├── SKILL.md
            └── references/
                ├── 01-thinking-frameworks.md
                ├── 02-investment-philosophy.md
                ├── 03-business-moat.md
                ├── 04-management-governance.md
                ├── 05-financial-metrics.md
                ├── 06-valuation-capital.md
                ├── 07-risk-behavior.md
                └── 08-industry-playbooks.md

Claude Code auto-discovers skills placed under .claude/skills/<name>/SKILL.md — no registration required.

Skill Structure

The buffett skill uses progressive disclosure: SKILL.md is always loaded, and the 8 reference files are read on-demand based on the analysis type.

Dispatch Logic

| Path | When | Files Read | |------|------|-----------| | A · Quick screen | "Is this worth analyzing?" | None — uses the 8-question checklist | | B · Deep analysis | Full company evaluation | 03→04→05→06, plus 08 (industry) and 07 (risk) as needed | | C · Topic question | Specific concept or decision | Directly loads the relevant reference file |

Reference Files

| File | Content | |------|---------| | 01-thinking-frameworks.md | Circle of competence, inversion, Mr. Market, long-term thinking, Munger's mental models | | 02-investment-philosophy.md | Intrinsic value, compounding, undervaluation, concentration, EMH rebuttal | | 03-business-moat.md | Five moat types, franchise vs. commodity business, economic goodwill | | 04-management-governance.md | Three-dimensional management assessment, institutional imperative, corporate culture | | 05-financial-metrics.md | Owner earnings, ROIC/ROE, cash conversion rate, look-through earnings | | 06-valuation-capital.md | Three valuation methods, margin of safety, five capital allocation paths | | 07-risk-behavior.md | When to sell, value traps, leverage, inflation, derivatives, behavioral biases | | 08-industry-playbooks.md | Insurance, banking, consumer, media, energy, railroads, tech, cautionary tales |

Output Format

Every analysis follows a structured template with all sections required:

Conclusion — Buy / Don't buy / Watch / Hold / Sell + one-sentence rationale
Circle of Competence — In circle / Out of circle / Boundary
Key Assumptions — 3–5 core assumptions the decision depends on
Business Quality — Moat type + strength + trend, management assessment
Financial Snapshot — ROIC, cash conversion rate, owner earnings estimate
Valuation — Intrinsic value range, margin of safety %, suggested entry price
Sell Criteria Check — Four sell criteria checked individually (required for hold/sell questions)
Key Risks — Top 3 risks only
Monitoring Indicators — Quarterly checks and sell triggers
Final Verdict — Decision and rationale in Buffett's voice

Eval Results

Benchmarked across 3 test cases (Apple stock analysis, banking framework, Moutai hold/sell):

| Metric | with skill | without skill | Delta | |--------|-----------|---------------|-------| | Pass rate | 100% (15/15) | 66.7% (10/15) | +33% | | Avg tokens | 43,353 | 12,524 | +30,829 | | Avg time | 154.4s | 95.2s | +59.2s |

The skill's primary value is systematic reference file reading (11+ tool calls vs 2) and strict output format adherence. The token/time cost is the tradeoff for analytical depth.

Mind Map

mindmap root((bft-skills<br/>Buffett Investment System)) Trigger Scenarios Stock / Company Analysis Financial Reports / Annual Letters Buy · Hold · Sell Decisions Moat / Competitive Advantage Management Quality Assessment Value Investing Concepts Industry-Specific Analysis Capital Allocation / Buybacks / Dividends Market Sentiment / Macro Risk Three Core Modules Moat Scanner Cost Advantage Switching Costs Network Effects Intangible Assets Efficient Scale Management Mirror Promises vs. Delivery Capital Allocation History Pay-Shareholder Alignment Margin of Safety Calculator Optimistic / Base / Pessimistic Intrinsic Value Range Suggested Entry Price Dispatch Logic A · Quick Screen 8-Question Checklist No Reference Files Needed B · Deep Analysis Moat 03 Management 04 Financials 05 Valuation 06 Industry Playbook 08 (as needed) Risk & Behavior 07 (as needed) C · Topic Question Load Relevant File Directly 8 Reference Files 01 Thinking Frameworks Circle of Competence · Inversion Mr. Market · Munger's Models 02 Investment Philosophy Intrinsic Value · Compounding Concentration · Undervaluation 03 Business Moat Five Moat Types Franchise vs. Commodity Economic Goodwill 04 Management & Governance Three-Dimensional Assessment Institutional Imperative · Culture 05 Financial Metrics Owner Earnings ROIC / ROE Cash Conversion Rate 06 Valuation & Capital Three Valuation Methods Margin of Safety Five Capital Allocation Paths 07 Risk & Behavior When to Sell Value Traps Behavioral Biases 08 Industry Playbooks Insurance · Banking · Consumer Media · Energy · Railroads Tech · Cautionary Tales

Output Format Conclusion (Buy/Pass/Hold/Sell) Circle of Competence Key Assumptions (3-5) Business Quality (Moat + Management) Financial Snapshot Valuation & Margin of Safety Sell Criteria Check Key Risks (max 3) Monitoring Indicators Final Verdict

Source Material

Reference files were compiled from 49 concept pages in the Buffett Letters corpus, covering every major topic from Buffett's shareholder letters and public writings.

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