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holocron/plugins/bin/skills/tdd/deep-modules.md
Defame1297 e50c98f722 chore: move skills and evals to plugins/bin, remove legacy root configs
Skills and evals migrated from .agents/ to plugins/bin/ plugin directory.
Remove .mcp.json, provider-manifest.sh, and skills-lock.json legacy artifacts.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-06-25 19:18:41 +00:00

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# Deep Modules
From "A Philosophy of Software Design":
**Deep module** = small interface + lots of implementation
```
┌─────────────────────┐
│ Small Interface │ ← Few methods, simple params
├─────────────────────┤
│ │
│ │
│ Deep Implementation│ ← Complex logic hidden
│ │
│ │
└─────────────────────┘
```
**Shallow module** = large interface + little implementation (avoid)
```
┌─────────────────────────────────┐
│ Large Interface │ ← Many methods, complex params
├─────────────────────────────────┤
│ Thin Implementation │ ← Just passes through
└─────────────────────────────────┘
```
When designing interfaces, ask:
- Can I reduce the number of methods?
- Can I simplify the parameters?
- Can I hide more complexity inside?