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yield-vault-patterns

Use when building ERC-4626 tokenized vaults, yield aggregators, or share-based deposit/withdraw systems. Covers share math, rounding, first depositor attack mitigation, and complete implementation patterns.

skills/yield-vault-patterns/SKILL.md

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# ERC-4626 Tokenized Vault Patterns

## Overview

ERC-4626 standardizes yield-bearing vaults. Depositors receive shares proportional to their deposit. Shares appreciate as the vault earns yield.

**Core Invariant**: `shares * totalAssets / totalShares = user's assets`

## Share Price Math

```
deposit:   shares = assets * totalSupply / totalAssets    (round DOWN)
mint:      assets = shares * totalAssets / totalSupply     (round UP)
withdraw:  shares = assets * totalSupply / totalAssets     (round UP)