# Source File Boundary Refactor

> Split or contain large source files according to the source-file boundary ADR without changing behavior opportunistically.

- Skill: `clawic/source-file-boundary-refactor` (Agent Skill)
- Install (CLI): `npx skillmds@latest add clawic/source-file-boundary-refactor`
- Raw SKILL.md: https://api.skillmd.com/api/skills/clawic/source-file-boundary-refactor/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: clawic (https://skillmd.com/u/clawic)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/clawic/source-file-boundary-refactor

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# source-file-boundary-refactor

Reduce source-file boundary debt.

## Procedure

1. Read the source-file boundary ADR and current baseline before editing.
2. Identify the responsibility boundary: parsing, registry data, UI state, rendering, service wiring, tests, fixtures, or utilities.
3. Extract one responsibility at a time while preserving public behavior.
4. Keep entrypoints thin: parse flags, delegate, and return.
5. Add or preserve tests that prove behavior did not change.
6. Update baselines only for accepted exceptions, not to hide new growth.

## Constraints

- Do not mix behavior changes into mechanical extraction unless needed for compilation.
- Do not grow files above limits except for extraction or explicit architecture approval.
- Prefer existing package patterns over new abstraction styles.