"Vibe coding" sounds like it removes the barrier, but a blank prompt box is just a blank page with more anxiety. The product had to meet users in the order they actually move: browse a feed of playable things, react to one, remix it with a single sentence, and only then create from nothing. I formalized that as a four-layer funnel, each layer with its own entries, hooks, metrics and design rules, and it became the shared model for product, growth and analytics.「Vibe coding」听起来消除了门槛，但一个空白的提示框只是一张更焦虑的白纸。产品必须按用户真实的顺序接住他们：先刷一个全是可玩之物的 Feed，对某一个产生反应，用一句话 remix 它，最后才从零创作。我把这个过程形式化为四层漏斗，每层有自己的入口、钩子、指标和设计规则，成为产品、增长与数据分析共用的模型。

• L1Browse · zero friction, no login; the first five cards must hook. Metric: session length, cards per session, D1 retention.零门槛、免登录；前五张卡必须有钩子。指标：会话时长、每会话卡片数、次日留存。
• L2Engage · like, comment, follow, share out to X, Reddit, Messages; login sheet kept light and in place. Metric: like rate, share click-through, login conversion.点赞、评论、关注、外分享到 X、Reddit、Messages；登录面板轻量且不打断。指标：点赞率、分享点击率、登录转化。
• L3Remix · one tap on someone's app, add a sentence, wait, publish. A blueprint removes the blank-prompt problem. Metric: remix start → publish rate.在别人的应用上一键 remix，加一句话，等待，发布。有蓝本就没有空白提示框的问题。指标：remix 开始 → 发布转化。
• L4Create · from an idea, a joke, a mood; multi-turn chat iteration; async generation you can leave and return to. Metric: create → publish, creator retention.从一个想法、一个梗、一种情绪出发；多轮对话迭代；可离开再回来的异步生成。指标：创建 → 发布，创作者留存。

HappySeeds mobile went from whiteboard to App Store submission in the first half of 2026, with the four-layer funnel as the shared language between product, growth and data. Alongside the product I rewrote the team's agent content pipeline (App Variant Studio) so that the feed had enough differentiated, playable apps to be worth browsing; that story lives in the Agent Harness section.HappySeeds 移动端在 2026 年上半年从白板走到 App Store 提交，四层漏斗成为产品、增长与数据之间的共同语言。在产品之外，我重写了团队的 agent 内容生产管线（App Variant Studio），让 Feed 里有足够多差异化、可玩的应用值得刷下去；那部分故事在 Agent 工程栏目里。