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 ace3000chao/book2startup --skill 006-growth-enginegit clone --depth 1 https://github.com/ace3000chao/book2startupWrote 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/ace3000chao/book2startup/006-growth-engine)<a href="https://agentmods.dev/skills/ace3000chao/book2startup/006-growth-engine"><img src="https://agentmods.dev/badge/skills/ace3000chao/book2startup/006-growth-engine/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/ace3000chao/book2startup/006-growth-engine"><img src="https://agentmods.dev/badge/skills/ace3000chao/book2startup/006-growth-engine.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 | $0.00058 | $0.01415 |
| Opus 5 | $0.00029 | $0.00707 |
| Sonnet 5 | $0.00012 | $0.00283 |
| Haiku 4.5 | $0.00006 | $0.00142 |
Grade A, and why
growth-engine 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 9d 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 — 92 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill: 增长引擎选择与优化
Metadata
- ID: leanstartup-006
- 类型: framework
- 来源: 《精益创业》第十章
- 验证状态: ✅ 三重验证通过（V1: 10章完整论证, V2: 规模化核心决策, V3: 独特框架）
R — Reading（原文引用）
"可持续的增长来自三种增长引擎中的一种：黏着式增长引擎、病毒式增长引擎和付费式增长引擎。"
"增长引擎决定产品/市场契合。当你的产品满足了顾客的真正需求时，增长引擎就会启动。"
I — Interpretation（方法论骨架）
增长引擎是创业的"飞轮"——一旦识别并优化它，增长会自我加速。
三种引擎的本质：
| 引擎 | 核心问题 | 关键指标 | 典型案例 |
|---|---|---|---|
| 黏着式 | 顾客会主动回来吗？ | 留存率、复购率 | SaaS订阅、电商复购 |
| 病毒式 | 顾客会主动传播吗？ | 病毒系数、传播率 | 社交网络、协作工具 |
| 付费式 | 我们能用钱买到顾客吗？ | CAC、LTV、客户终身价值 | 电商、游戏内购 |
核心洞察：大多数创业者在还没搞清楚自己的引擎是哪一种之前，就拼命优化增长。这就像"不知道引擎在哪里的赛车手"，用了很多力气但车没动。
A1 — Past Application（书中案例）
Facebook的病毒式增长：Facebook第一个版本非常简单（投票功能），但设计了"邀请朋友"的机制。用户的每次互动都会触发推荐朋友的提示，导致6年内超过谷歌的流量。关键不是"产品有多好"，而是"增长机制是否被嵌入产品体验"。
Wealthfront的价值获取教训：他们以为自己的增长引擎是"病毒式"（玩家推荐玩家），但实际上数据揭示了残酷真相——转化率几乎为零。最终通过转型到"付费式增长"（直接获取专业理财经理）才实现增长。
A2 — Future Trigger（何时调用）
当你听到以下问题时，就应该调用这个Skill：
- "我们的用户数在涨，但不知道是什么原因带来的增长"
- "获客成本越来越高，不知道还能撑多久"
- "产品口碑不错，但增长很慢，怎么加速？"
- "我们是否应该做广告投放/口碑营销/渠道合作？"
- "很多用户注册了但不活跃，怎么让更多人回来？"
E — Execution（可执行步骤）
步骤1：识别你的增长引擎
回答这个问题：你的增长主要来自哪里？
如果是"顾客用过之后主动回来或主动告诉朋友" → 黏着式/病毒式引擎 如果是"我们花钱买流量/做活动拉来的" → 付费式引擎 如果不清楚 → 很可能目前没有真正的增长引擎
步骤2：测量引擎核心指标
黏着式引擎：
- 每周/每月留存率：这一周的活跃用户中，有多少下周还回来？
- 目标：40%以上的月留存是健康的黏着式产品
病毒式引擎：
- 病毒系数：每个用户平均带来多少新用户？（>1才算病毒式）
- 目标：系数>1，否则增长不可持续
付费式引擎：
- LTV/CAC比值：每个顾客终身价值是获客成本的多少倍？
- 目标：LTV > 3× CAC才可持续
步骤3：优化引擎，而非渠道
错误做法："我们应该在抖音/小红书/微信都投广告吗？" 正确做法："我们的病毒系数只有0.3，问题出在分享机制还是产品体验？"
先让引擎转起来，再谈规模化。
步骤4：当引擎停滞时的转型决策
如果某个引擎已经达到极限（优化后没有明显提升），需要考虑增长引擎转型：
- 从黏着式转型为付费式（如：口碑无法带来足够增长，开始付费推广）
- 从付费式转型为病毒式（如：发现用户推荐的成本效益更高）
B — Boundary（何时不适用）
| 不适用场景 | 原因 |
|---|---|
| 产品/市场契合尚未达到 | 没有达到契合之前，优化增长引擎是浪费资源 |
| 还在验证MVP阶段 | 这个阶段的核心是学习，不是增长 |
| B2B大型销售周期 | 增长引擎概念主要适用于ToC/订阅业务 |
作者盲点提醒：很多创业者把"获客"当成增长，但忽视了在产品未达到PMF（产品/市场契合）之前的增长只会让浪费放大——你快速获得的大量顾客如果留不住，他们的流失会摧毁口碑。先有留存，后有增长。
关联Skills
- 创新核算三步骤 — 追踪增长引擎的指标表现
- 转型决策树 — 当引擎停滞时决定是否转型
- 对比测试 — 优化引擎的核心实验工具
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.
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.
- 9d ago First seen · 92 lines · 58 tokens per session scan A f9a81210c2f4
growth-engine is a skill published in the GitHub repository ace3000chao/book2startup (80 stars, last pushed 4mo ago), licensed MIT. It adds 58 tokens to every session and 1,415 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 2026-09-03.
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