good-business

good-business is a skill for Claude Code, Codex from kangarooking/duan-yongping-skill. It costs 153 tokens per session (3,017 once invoked), scanned A, original, MIT.

An analysis framework for judging whether a company has a durable competitive advantage, meaning rivals may struggle to take its customers or profits over time.

In plain words
What is it for?
It is for examining a company's business model, product differences, replaceability, long-term margins, cash flow, culture, and ability to defend its position.
Why use it?
It provides a fixed way to assess the business before getting absorbed in financial calculations or the share price.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit It is for examining a company's business model, product differences, replaceability, long-term margins, cash flow, culture, and ability to defend its position.

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Install with agentmods
npx agentmods add skills/kangarooking/duan-yongping-skill/good-business
Install

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.

Any agent
npx skills add kangarooking/duan-yongping-skill --skill good-business
Clone the repo
git clone --depth 1 https://github.com/kangarooking/duan-yongping-skill

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for good-business

README.md
[![agentmods](https://agentmods.dev/badge/skills/kangarooking/duan-yongping-skill/good-business/github.svg)](https://agentmods.dev/skills/kangarooking/duan-yongping-skill/good-business)
Your own site
<a href="https://agentmods.dev/skills/kangarooking/duan-yongping-skill/good-business"><img src="https://agentmods.dev/badge/skills/kangarooking/duan-yongping-skill/good-business/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.

agentmods 80×15 button for good-business

Your own site · 80×15
<a href="https://agentmods.dev/skills/kangarooking/duan-yongping-skill/good-business"><img src="https://agentmods.dev/badge/skills/kangarooking/duan-yongping-skill/good-business.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 153 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,017 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00153 $0.03017
Opus 5 $0.00077 $0.01509
Sonnet 5 $0.00031 $0.00603
Haiku 4.5 $0.00015 $0.00302

Measured 12d ago against content hash 82a29d3884d6, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

good-business 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 12d 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.

investment-logic/good-business/SKILL.md · 136 lines

How it starts

The opening of the file, as written. The whole thing — 136 lines — stays where its author put it; the contents beside it link to each section on GitHub.

好生意识别法(商业模式护城河分析)

R — 原文 (Reading)

好的商业模式的很简单,就是利润和净现金流一直都是杠杠的,而且竞争对手哪怕很长的时间里也很难抢。商业模式经常要看的东西不外是护城河是否长期坚固(产品的差异化的持续性,包括企业文化),长期的毛利率是否合理(产品的可替代性),长期的净现金流(长期而言其实就是净利润)是否满意。投资最重要的还是要看生意模式。先看商业模式,除非你喜欢这家公司的商业模式,不然就不再往下看了。所谓未来现金流的定性分析比定量分析要重要的多,用公式的人往往会陷于细节而忽略整体。

— 段永平,第三章第2节"什么是看懂一个公司" / 第七章案例分析


I — 方法论骨架 (Interpretation)

  1. 好生意的本质:利润和净现金流长期强劲,竞争对手长时间内难以抢走——不是"现在赚钱",而是"持久地赚钱且别人抢不走"。
  2. 分析顺序严格固定:先看商业模式(企业怎么挣钱),再看企业文化,最后才看价格。商业模式不过关的公司直接排除,不再往下看——这是从巴菲特那里学到的最值钱的一课。
  3. 定性远比定量重要:护城河是否长期坚固、产品差异化是否持续、可替代性高低,这些定性判断优先于任何财务指标计算。用公式的人容易陷入细节而忽略整体。
  4. 检验标准:护城河持久性(产品差异化的持续性)+ 长期毛利率合理性(可替代性)+ 长期净现金流满意度。三项缺一不可。
  5. "懂"的验证:看懂一家公司的标志是——股价大跌时你想加仓而非恐慌卖出。如果还需要到处问"发生什么事了",说明没看懂。
  6. 排除法驱动:不喜欢的商业模式直接跳过,不纠结"能不能看懂"——没有兴趣的公司不需要懂。

A1 — 书中的应用 (Past Application)

案例 1: 贵州茅台

  • 问题: 茅台是否具备好生意的特征?反腐冲击下能否持续?
  • 方法论的使用: 用好生意框架逐项检验——利润和净现金流持续强劲(毛利率极高,预收款充足),库存越久越值钱("茅台的库存几乎就是个宝,消费电子的库存几乎就是垃圾"),定价权极强(喜欢喝茅台的人不会因涨价转喝五粮液),供不应求(市场占有率仅千分之二三),护城河由不可复制的地理环境和品牌文化构成。
  • 结论: 茅台是好生意的典范——不怕库存、不需售后服务、产品差异化大、新品牌几乎无法进入。
  • 结果: 反腐短期冲击销量,但茅台长期价值不变;段永平在塑化剂事件时自费送检,基于对生意的理解保持平常心,持续持有。

案例 2: 苹果

  • 问题: 失去乔布斯的苹果还是好生意吗?
  • 方法论的使用: 先看商业模式——苹果是"梦寐以求但难以达到的生意模式"。单品模式带来三重优势:①人力物力集中做精品(开发成本低但单品开发费最高);②规模效应极致化(材料成本低且质量好);③渠道成本极低。平台/生态护城河已形成(光软件年收入数十亿),用户锁定效应极强("还没见过用iphone的换到其他手机的")。企业文化以消费者为导向做到极致。
  • 结论: 苹果最厉害的是平台和生意模式,不是某个天才个人。"苹果已经有了很好的生意模式"——定性结论先于任何PE计算。
  • 结果: 2011年以约3000亿市值买入(扣现金后PE仅12-13倍),预测5年后利润达500亿(实际595亿),长期持有获得巨大回报。

案例 3: 创维(反面:非典型好生意但极低估值)

  • 问题: 产品质量一般的创维值不值得投?
  • 方法论的使用: 不是从"好生意"出发,而是从资产价值出发——市值仅十多亿港币,一栋大楼就接近那个价。作为电视机行业里"最健康的企业",如果它都活不下去,整个行业就不复存在了。
  • 结论: 这是"资产折价"逻辑而非"好生意"逻辑的案例,但同样遵循"定性优先"原则——行业健康度判断优先于ROE等指标。
  • 结果: 段永平坦言"没看过ROE",仅凭行业判断和资产安全边际买入。

A2 — 触发场景 (Future Trigger) ★

用户会在什么情境下需要这个 skill?

  1. 用户正在研究某家公司,想判断这门生意是否"真的好"——比如拿到一只股票推荐,不确定它的商业模式是否具备持久竞争力
  2. 用户从PE、ROE等财务指标出发分析公司,发现数据好看但内心不踏实,需要回到商业本质来验证
  3. 用户持有的股票大跌,想判断是"市场错杀"还是"生意本身出了问题"——需要重新审视商业模式是否依然成立

语言信号 (用户的话里出现这些就应激活)

  • "这个生意模式怎么样/这门生意好不好"
  • "为什么这家公司能一直赚钱/护城河在哪"
  • "竞争对手能不能抢走它的市场"

Read the full file on GitHub · 136 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

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.

  1. 12d ago First seen · 136 lines · 153 tokens per session scan A 82a29d3884d6

Subscribe to this mod's changes

good-business is a skill published in the GitHub repository kangarooking/duan-yongping-skill (48 stars, last pushed 4mo ago), licensed MIT. It adds 153 tokens to every session and 3,017 once invoked, about $0.0008 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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