# Decide Extraction

> When to extract an Action class vs inline code. Extraction decisions.

- Skill: `attac-t/decide-extraction` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add attac-t/decide-extraction`
- Raw SKILL.md: https://api.skillmd.com/api/skills/attac-t/decide-extraction/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: attac-t (https://skillmd.com/u/attac-t)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/attac-t/decide-extraction

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# Skill: Extraction

> "If you can name it with VerbNoun, extract it."

## The Decision

**Extract to Action when:**
- You can name it clearly: `CreateOrder`, `SendInvoice`
- 2+ consumers will call it
- Business rules exist beyond CRUD
- It dispatches events or composes other Actions

**Keep inline when:**
- Single CRUD operation with no rules
- One caller, forever
- Would just wrap `Model::create($data)`

## The Heuristic

Ask: *"If I delete this code, what breaks?"*

- **Multiple things** → Action
- **One thing** → Inline

## The Quick Test

| Ask Yourself          | Answer | Use    |
|-----------------------|--------|--------|
| Can name it VerbNoun? | No     | Inline |
| Multiple consumers?   | Yes    | Action |
| Has business rules?   | Yes    | Action |
| Dispatches events?    | Yes    | Action |
| Just wraps CRUD?      | Yes    | Inline |

## Real-World Examples

For concrete examples, see [examples.md](examples.md).