The Ultimate Buffett Skills Review (2026): What You Must Know

The Problem with "Generic" AI Financial Advice

Most LLMs give you the same lukewarm investment advice: "Apple has a strong brand," or "Diversification reduces risk." It is boilerplate fluff that sounds like a first-year business student. If you are using Claude Code to analyze companies, you don't want a chatbot's best guess; you want a systematic filter that thinks like the greatest capital allocator in history.

I spent the last week testing buffett skills to see if it actually transforms Claude into a rigorous value investor or if it is just a glorified system prompt. When you are putting actual capital at risk, you need a tool that forces the AI to look at "owner earnings" and "moats" rather than just reciting the latest ticker price. This buffett skills review breaks down whether this open-source project deserves a spot in your terminal.

What is buffett skills?

buffett skills is an open-source investment analysis tool for Claude Code that automates fundamental research using Warren Buffett's multi-decade framework — it stands out by forcing the AI to reference a specific 49-point knowledge base derived from Buffett's actual shareholder letters.

Built by the agi-now team, this isn't a standalone app. It is a "skill" folder you drop into your local development environment. Once installed, Claude Code gains the ability to "trigger" the Buffett mindset whenever you mention a stock, a financial report, or a business model. It uses a method called progressive disclosure, meaning it only pulls in the data it needs—whether that’s banking-specific frameworks or management integrity checks—to keep the analysis focused.

Hands-On Experience: Testing the Logic

Using buffett skills feels fundamentally different from a standard Claude chat. It’s less of a conversation and more of a structured audit. Here is how it performed during my testing on several tech and consumer staples stocks.

The "Invisible" Trigger System

The best part of the workflow is that you don't have to ask Claude to "act like Buffett." In my tests, simply typing analyze AAPL's latest 10-K or Is Costco a good business? immediately activated the skill. You see Claude start making tool calls to specific reference files like MOAT.md and FINANCIALS.md. It feels like watching a junior analyst run to a specialized library to grab the right textbooks before answering your question. This automation removes the mental overhead of remembering specific prompts.

Depth vs. Speed: The 43,000 Token Reality

This is where you need to be careful. In one test case analyzing a banking stock, the tool consumed over 43,000 tokens and took 154 seconds to complete. Because it makes 10+ tool calls to read through its internal "Buffett Library," it is significantly slower than a standard AI query. However, the delta in quality is massive. While standard Claude might give you a 300-word summary, buffett skills produces a massive, structured report covering intrinsic value ranges, margin of safety percentages, and specific sell criteria. You are trading speed and API costs for analytical depth.

Rigid Output That Prevents Hallucinations

The output format is non-negotiable. Every analysis ends with a "Final Verdict" in Buffett’s characteristic voice, but more importantly, it includes a "Circle of Competence" check. If the AI realizes it doesn't have enough data on a specific industry—like biotech or complex derivatives—it explicitly flags it as "Out of Circle." This honesty is rare in AI. It prevents the model from "faking" an investment thesis when the underlying business is too complex for the provided data. I found the "Key Assumptions" section particularly useful; it lists exactly what must be true for the investment to work, which gives you a clear checklist for your own due diligence.

Getting Started with buffett skills

To use this, you must already have Claude Code installed and authenticated on your machine. This is a tool for developers or tech-savvy investors, not a one-click web app.

1. Clone the Repository: Open your terminal and run git clone https://github.com/agi-now/buffett-skills.
2. Locate Your Project: Navigate to the project directory where you do your research.
3. Install the Skill: Create a directory at .claude/skills/buffett/ and copy the contents of the skills/buffett folder from the cloned repo into it. The file SKILL.md must be at the root of that folder.
4. Verify: Run claude in your terminal. You don't need to register anything; Claude Code auto-discovers the skill on startup.
5. Run an Analysis: Ask a direct question like "Evaluate the moat of Coca-Cola."

Pricing Breakdown

The buffett skills software itself is free and open-source under the MIT license. You can download, modify, and use it without paying the developers a cent. However, using it is far from free because of how Claude Code works.

• Software Cost: $0 (Open Source).
• API Costs: You pay for the tokens used by Claude 3.5 Sonnet. Since a single deep-dive analysis can use 30,000 to 50,000 tokens, a single report might cost you between $0.10 and $0.25 depending on current Anthropic pricing.
• Subscription: You need an active Claude Pro subscription or an API key with sufficient credits to run Claude Code.

For professional investors, $0.20 for a 1,500-word rigorous analysis is a bargain. For casual hobbyists, those costs can add up if you are "window shopping" dozens of stocks a day. There are no "tiers"—you get the full power of the tool as long as you can pay the underlying API costs.

Strengths vs. Limitations

While buffett skills offers a level of rigor missing from standard AI tools, it is not without trade-offs. It is a specialized instrument designed for deep research rather than quick glances.

Competitive Analysis

The AI financial space is crowded with "wrappers" that simply summarize news. buffett skills differs by being a logic-first framework that runs locally within your development environment, prioritizing fundamental principles over sentiment analysis or technical charting.

Pick buffett skills if: You are a value-oriented investor who wants a rigorous, automated second opinion that won't "agree" with you just to be polite. It is for those who treat investing as capital allocation rather than gambling.

Pick Standard Claude or Seeking Alpha if: You need instant answers, real-time price alerts, or are uncomfortable working in a terminal environment. These tools are better suited for "glance-and-go" retail trading.

Frequently Asked Questions

Does buffett skills support international stocks? Yes, as long as you provide the relevant financial reports or Claude has access to global web search tools.

Is my financial data private? The skill runs locally on your machine, but the data is processed by Anthropic’s API according to their standard security protocols.

Do I need to be a programmer to use this? You need basic terminal proficiency to clone the repository and navigate file directories, but no actual coding is required.

Verdict: 4.5/5 Stars

buffett skills is a powerhouse for fundamental analysts. It effectively solves the "lazy AI" problem by forcing Claude to follow a proven, multi-decade methodology. It isn't for everyone—the terminal-based setup and the high token costs will alienate casual users. However, for the serious investor, the $0.20 spent on a deep-dive analysis is the best ROI you can find in the AI market today. Use it if you want a junior analyst who never sleeps; skip it if you just want to know if a stock is "going up" tomorrow.