MCPInstall

smart-contract-security

by pluginagentmarketplaceSecurity

Master smart contract security with auditing, vulnerability detection, and incident response

Installs
263
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Security
Not audited

Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/pluginagentmarketplace/custom-plugin-blockchain --skill smart-contract-security
  1. 01

    Install

    Run the command in your project. The CLI asks which agents to install for.

  2. 02

    Describe the task

    Ask your agent for something this skill covers. It loads smart-contract-security automatically when relevant.

  3. 03

    Review the result

    The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

Smart Contract Security Skill

Master smart contract security with vulnerability detection, auditing methodology, and incident response procedures.

Quick Start

# Invoke this skill for security analysis
Skill("smart-contract-security", topic="vulnerabilities", severity="high")

Topics Covered

1. Common Vulnerabilities

Recognize and prevent:

  • Reentrancy: CEI pattern violation
  • Access Control: Missing modifiers
  • Oracle Manipulation: Flash loan attacks
  • Integer Issues: Precision loss

2. Auditing Methodology

Systematic review process:

  • Manual Review: Line-by-line analysis
  • Static Analysis: Automated tools
  • Fuzzing: Property-based testing
  • Formal Verification: Mathematical proofs

3. Security Tools

Essential tooling:

  • Slither: Fast static analysis
  • Mythril: Symbolic execution
  • Foundry: Fuzzing, invariants
  • Certora: Formal verification

4. Incident Response

Handle security events:

  • Triage: Assess severity
  • Mitigation: Emergency actions
  • Post-mortem: Root cause analysis
  • Disclosure: Responsible reporting

Vulnerability Quick Reference

Critical: Reentrancy

// VULNERABLE
function withdraw(uint256 amount) external {
    (bool ok,) = msg.sender.call{value: amount}("");
    require(ok);
    balances[msg.sender] -= amount;  // After call!
}

// FIXED: CEI Pattern
function withdraw(uint256 amount) external {
    balances[msg.sender] -= amount;  // Before call
    (bool ok,) = msg.sender.call{value: amount}("");
    require(ok);
}

High: Missing Access Control

// VULNERABLE
function setAdmin(address newAdmin) external {
    admin = newAdmin;  // Anyone can call!
}

// FIXED
function setAdmin(address newAdmin) external onlyOwner {
    admin = newAdmin;
}

High: Unchecked Return Value

// VULNERABLE
IERC20(token).transfer(to, amount);  // Ignored!

// FIXED: Use SafeERC20
using SafeERC20 for IERC20;
IERC20(token).safeTransfer(to, amount);

Medium: Precision Loss

// VULNERABLE: Division before multiplication
uint256 fee = (amount / 1000) * rate;

// FIXED: Multiply first
uint256 fee = (amount * rate) / 1000;

Audit Checklist

Pre-Audit

  • Code compiles without warnings
  • Tests pass with good coverage
  • Documentation reviewed

Core Security

  • CEI pattern followed
  • Reentrancy guards present
  • Access control on admin functions
  • Input validation complete

DeFi Specific

  • Oracle staleness checks
  • Slippage protection
  • Flash loan resistance
  • Sandwich prevention

Security Tools

Static Analysis

# Slither - Fast vulnerability detection
slither . --exclude-dependencies

# Mythril - Symbolic execution
myth analyze src/Contract.sol

# Semgrep - Custom rules
semgrep --config "p/smart-contracts" .

Fuzzing

// Foundry fuzz test
function testFuzz_Withdraw(uint256 amount) public {
    amount = bound(amount, 1, type(uint128).max);

    vm.deal(address(vault), amount);
    vault.deposit{value: amount}();

    uint256 before = address(this).balance;
    vault.withdraw(amount);

    assertEq(address(this).balance, before + amount);
}

Invariant Testing

function invariant_BalancesMatchTotalSupply() public {
    uint256 sum = 0;
    for (uint i = 0; i < actors.length; i++) {
        sum += token.balanceOf(actors[i]);
    }
    assertEq(token.totalSupply(), sum);
}

Severity Classification

SeverityImpactExamples
CriticalDirect fund lossReentrancy, unprotected init
HighSignificant damageAccess control, oracle manipulation
MediumConditional impactPrecision loss, timing issues
LowMinor issuesMissing events, naming

Incident Response

1. Detection

# Monitor for suspicious activity
cast logs --address $CONTRACT --from-block latest

2. Mitigation

// Emergency pause
function pause() external onlyOwner {
    _pause();
}

3. Recovery

  • Assess damage scope
  • Coordinate disclosure
  • Deploy fixes with audit

Common Pitfalls

PitfallRiskPrevention
Only testing happy pathMissing edge casesFuzz test boundaries
Ignoring integrationsExternal call risksReview all dependencies
Trusting block.timestampMiner manipulationUse for long timeframes only

Cross-References

  • Bonded Agent: 06-smart-contract-security
  • Related Skills: solidity-development, defi-protocols

Resources

  • SWC Registry: Common weakness enumeration
  • Rekt News: Hack post-mortems
  • Immunefi: Bug bounties

Version History

VersionDateChanges
2.0.02025-01Production-grade with tools, methodology
1.0.02024-12Initial release

FAQ

What does the smart-contract-security skill do?

Master smart contract security with auditing, vulnerability detection, and incident response

How do I install smart-contract-security?

Run npx skills add https://github.com/pluginagentmarketplace/custom-plugin-blockchain --skill smart-contract-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/smart-contract-security/ (personal) or .claude/skills/smart-contract-security/ (project).

Which AI agents can use smart-contract-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 smart-contract-security safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains smart-contract-security?

It is published by pluginagentmarketplace in pluginagentmarketplace/custom-plugin-blockchain. It has 263 recorded installs.

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