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token-integration-safety

Safe integration patterns for non-standard ERC-20 tokens. Use when building protocols that accept arbitrary tokens. Covers USDT (no return value), USDC (6 decimals, blacklist), fee-on-transfer, rebasing tokens, ERC-777 callbacks, pausable tokens, and Permit2.

skills/token-integration-safety/SKILL.md

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Oct 23, 2026
License
MIT

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# Token Integration Safety

## Always Use SafeERC20

This is the single most important rule. Never call `transfer`, `transferFrom`, or `approve` directly.

```solidity
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

contract Vault {
    using SafeERC20 for IERC20;

    function deposit(IERC20 token, uint256 amount) external {