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analyze-coupling-cohesion

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Analyzes coupling and cohesion metrics in PHP codebases. Calculates Afferent/Efferent coupling (Ca/Ce), LCOM metrics, instability index, and abstractness. Identifies highly coupled modules and low cohesion classes.

skills/analyze-coupling-cohesion/SKILL.md

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# Coupling & Cohesion Analyzer

## Overview

This skill analyzes PHP codebases for coupling and cohesion metrics, helping identify architectural issues like unstable dependencies, low cohesion classes, and tightly coupled modules.

## Metrics Reference

| Metric | Formula | Target | Description |
|--------|---------|--------|-------------|
| Ca (Afferent) | Incoming deps | - | Classes depending ON this |
| Ce (Efferent) | Outgoing deps | < 10 | Classes this DEPENDS on |
| Instability (I) | Ce / (Ca + Ce) | 0.0-1.0 | 0=stable, 1=unstable |
| Abstractness (A) | Abstract / Total | 0.0-1.0 | Ratio of interfaces |