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codebase-design

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用于设计深模块的共享词汇。适用于用户想设计或改进模块接口、寻找深化机会、决定 seam 放在哪里、让代码更容易测试或更适合 AI 导航，或其他技能需要深模块词汇时。

skills/engineering/codebase-design/SKILL.md

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# 代码库设计

设计 **deep modules**：把大量行为放在小 interface 之后，把 interface 放在清晰 seam 上，并通过该 interface 测试。凡是在设计或重构代码时，都使用这套语言和原则。目标是给 callers 带来 leverage，给 maintainers 带来 locality，并让每个人都更容易测试。

## 术语表

准确使用这些术语，不要替换成 "component"、"service"、"API" 或 "boundary"。一致语言就是重点。

**Module** - 任何拥有 interface 和 implementation 的东西。它故意不限定尺度：function、class、package，或跨层 slice 都可以。_Avoid_: unit, component, service.

**Interface** - caller 为了正确使用 module 必须知道的一切：type signature，以及 invariants、ordering constraints、error modes、required configuration 和 performance characteristics。_Avoid_: API, signature（太窄，只指 type-level surface）。

**Implementation** - module 内部的代码体。它不同于 **Adapter**：一个东西可以是小 adapter 但有大 implementation（Postgres repo），也可以是大 adapter 但 implementation 很小（in-memory fake）。讨论 seam 时说 adapter；其他时候说 implementation。
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