Solidity Security skill: what it does and how to install it

What it does. Covers secure Solidity patterns for reentrancy, arithmetic errors, access control, DeFi protocols and gas-aware development. It provides worked examples for checks-effects-interactions, documented contracts and Hardhat tests that verify attack prevention and permissions.

When to use it. For writing or reviewing smart contracts, adding security measures, investigating common attack vectors, optimising gas without weakening safety, or preparing a contract for professional audit.