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integer-overflow

Integer safety patterns for Solidity 0.8+. Use when working with unchecked blocks, safe casting, or intermediate calculation overflow risks. Covers automatic checks, intentional overflow, phantom overflow, and safe math patterns.

skills/integer-overflow/SKILL.md

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# Integer Safety

## Solidity 0.8+ Automatic Checks

Since Solidity 0.8, arithmetic operations revert on overflow/underflow by default. This eliminates the need for SafeMath but introduces new considerations.

```solidity
// These all revert automatically on overflow (Solidity 0.8+)
uint256 a = type(uint256).max;
uint256 b = a + 1;  // reverts: arithmetic overflow

uint256 c = 0;
uint256 d = c - 1;  // reverts: arithmetic underflow