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---
name: clean-code-file-size-decision-tree
description: 'Sub-skill of clean-code: File Size Decision Tree.'
version: 2.1.0
category: workspace
type: reference
scripts_exempt: true
---
# File Size Decision Tree
## File Size Decision Tree
When a file exceeds 400 lines:
```
Is it a God Object (does many unrelated things)?
YES → Split by responsibility (see Decomposition Patterns below)
NO → Is it a report generator / long output formatter?
YES → Extract: data-gathering logic → separate module
formatting/rendering → reporter.py / formatter.py
NO → Is it a data model / schema file?
YES → Acceptable if types are coherent; add __all__
NO → Is it a legacy solver (low churn, full tests)?
YES → Add # noqa: clean-code; open WRK for future split
NO → Split now
```
---
