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access-control-patterns

Access control design patterns for Solidity protocols. Use when implementing role-based permissions, timelocks, emergency controls, or multi-sig requirements. Covers Ownable2Step, AccessControl, AccessManager, timelock patterns, and emergency pause.

skills/access-control-patterns/SKILL.md

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# Access Control Patterns

## Ownable2Step (Preferred over Ownable)

Two-step ownership transfer prevents accidental transfer to a wrong address.

```solidity
import {Ownable2Step, Ownable} from "@openzeppelin/contracts/access/Ownable2Step.sol";

contract Treasury is Ownable2Step {
    constructor(address initialOwner) Ownable(initialOwner) {}

    function withdrawFunds(address to, uint256 amount) external onlyOwner {
        if (to == address(0)) revert ZeroAddress();