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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/wshobson/agents --skill solidity-security- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads solidity-security automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
Security audits
Independent scans of the skill's instructions and bundled files.
SKILL.md
The instructions your agent reads when the skill is triggered.
Solidity Security
Master smart contract security best practices, vulnerability prevention, and secure Solidity development patterns.
When to Use This Skill
- Writing secure smart contracts
- Auditing existing contracts for vulnerabilities
- Implementing secure DeFi protocols
- Preventing reentrancy, overflow, and access control issues
- Optimizing gas usage while maintaining security
- Preparing contracts for professional audits
- Understanding common attack vectors
Detailed patterns and worked examples
Detailed pattern documentation lives in references/details.md. Read that file when the navigation tier above is insufficient.
Testing for Security
// Hardhat test example
const { expect } = require("chai");
const { ethers } = require("hardhat");
describe("Security Tests", function () {
it("Should prevent reentrancy attack", async function () {
const [attacker] = await ethers.getSigners();
const VictimBank = await ethers.getContractFactory("SecureBank");
const bank = await VictimBank.deploy();
const Attacker = await ethers.getContractFactory("ReentrancyAttacker");
const attackerContract = await Attacker.deploy(bank.address);
// Deposit funds
await bank.deposit({ value: ethers.utils.parseEther("10") });
// Attempt reentrancy attack
await expect(
attackerContract.attack({ value: ethers.utils.parseEther("1") }),
).to.be.revertedWith("ReentrancyGuard: reentrant call");
});
it("Should prevent integer overflow", async function () {
const Token = await ethers.getContractFactory("SecureToken");
const token = await Token.deploy();
// Attempt overflow
await expect(token.transfer(attacker.address, ethers.constants.MaxUint256))
.to.be.reverted;
});
it("Should enforce access control", async function () {
const [owner, attacker] = await ethers.getSigners();
const Contract = await ethers.getContractFactory("SecureContract");
const contract = await Contract.deploy();
// Attempt unauthorized withdrawal
await expect(contract.connect(attacker).withdraw(100)).to.be.revertedWith(
"Ownable: caller is not the owner",
);
});
});
Audit Preparation
contract WellDocumentedContract {
/**
* @title Well Documented Contract
* @dev Example of proper documentation for audits
* @notice This contract handles user deposits and withdrawals
*/
/// @notice Mapping of user balances
mapping(address => uint256) public balances;
/**
* @dev Deposits ETH into the contract
* @notice Anyone can deposit funds
*/
function deposit() public payable {
require(msg.value > 0, "Must send ETH");
balances[msg.sender] += msg.value;
}
/**
* @dev Withdraws user's balance
* @notice Follows CEI pattern to prevent reentrancy
* @param amount Amount to withdraw in wei
*/
function withdraw(uint256 amount) public {
// CHECKS
require(amount <= balances[msg.sender], "Insufficient balance");
// EFFECTS
balances[msg.sender] -= amount;
// INTERACTIONS
(bool success, ) = msg.sender.call{value: amount}("");
require(success, "Transfer failed");
}
}
FAQ
What does the solidity-security skill do?
Master smart contract security best practices to prevent common vulnerabilities and implement secure Solidity patterns. Use when writing smart contracts, auditing existing contracts, or implementing security measures for blockchain applications.
How do I install solidity-security?
Run npx skills add https://github.com/wshobson/agents --skill solidity-security in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/solidity-security/ (personal) or .claude/skills/solidity-security/ (project).
Which AI agents can use solidity-security?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is solidity-security safe to install?
Security partners have reviewed it: Gen Agent Trust Hub passed; Socket passed; Snyk passed; Runlayer passed; ZeroLeaks passed. As with any skill, read the SKILL.md and bundled scripts before installing.
Who maintains solidity-security?
It is published by wshobson in wshobson/agents. It has 15,474 recorded installs.
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