Individual skill

diamond-pattern

Use when building large modular contracts with EIP-2535 Diamond pattern. Covers facets, diamondCut, diamond loupe, AppStorage and DiamondStorage patterns, selector mapping, and facet upgrade process.

skills/diamond-pattern/SKILL.md

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# EIP-2535 Diamond Pattern

## Overview

The Diamond pattern splits a contract into multiple "facets" (logic modules) that share a single storage and address. Bypasses the 24KB contract size limit and enables surgical upgrades of individual functions.

## Architecture

```
User → Diamond Proxy
         ├── FacetA (functions a1, a2)
         ├── FacetB (functions b1, b2, b3)
         ├── DiamondCutFacet (add/replace/remove functions)
         └── DiamondLoupeFacet (introspection)