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check-immutability

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Analyzes PHP code for immutability violations. Checks Value Objects, Events, DTOs for readonly properties, no setters, final classes, and wither patterns. Ensures domain objects maintain invariants.

skills/check-immutability/SKILL.md

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# Immutability Analyzer

## Overview

This skill analyzes PHP DDD projects for immutability violations in Value Objects, Domain Events, DTOs, and Read Models. Immutability is crucial for maintaining invariants, thread safety, and predictable behavior.

## Immutability Requirements by Type

| Type | Must Be Immutable | Key Checks |
|------|-------------------|------------|
| Value Object | ✅ Required | readonly, no setters, final |
| Domain Event | ✅ Required | readonly, no modification after creation |
| DTO | ✅ Recommended | readonly, no business logic |
| Read Model | ✅ Required | readonly, projection-only changes |
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