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codebase-design

Use when designing or improving a module interface, choosing a seam, reducing shallow modules, making code easier to test, or reviewing architecture for locality, leverage, adapters, and deep-module design.

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Codebase Design

Use this vocabulary when shaping code so Decisions workflows and future agents talk about architecture consistently.

Vocabulary

  • Module: anything with an interface and implementation: function, class, package, or vertical slice.
  • Interface: everything a caller must know: type shape, invariants, ordering, errors, config, and performance.
  • Implementation: what sits behind the interface.
  • Depth: how much behavior sits behind a small interface.
  • Seam: where behavior can vary without editing the caller.
  • Adapter: a concrete implementation at a seam.
  • Leverage: capability gained by callers.
  • Locality: change and verification concentrated in one place.

Rules

  • Prefer deep modules: small interface, rich implementation.
  • Use the deletion test: if removing the module only moves complexity, it was shallow.
  • Tests should cross the same interface callers use.
  • One adapter means a hypothetical seam. Two adapters means a real seam.
  • In Decisions tickets, name modules with project domain terms and record durable decisions in project docs or workflow memory.

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