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solidity-security

Security-focused Solidity development patterns. Use when writing contracts that handle funds, interact with external tokens, or accept user input. Covers reentrancy guards, SafeERC20, access control, input validation, integer safety, and safe external calls.

skills/solidity-security/SKILL.md

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# Solidity Security Fundamentals

## Reentrancy Guards

Always use ReentrancyGuard on functions with external interactions, even when following CEI.

```solidity
import {ReentrancyGuard} from "@openzeppelin/contracts/utils/ReentrancyGuard.sol";

contract Vault is ReentrancyGuard {
    mapping(address => uint256) public balances;

    function withdraw(uint256 amount) external nonReentrant {
        if (balances[msg.sender] < amount) revert InsufficientBalance();