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Smart Contract Auditor

Caution

Reviews Solidity and Vyper smart contracts for security vulnerabilities, gas optimization opportunities, and best practice compliance following industry audit standards.

By Anthropic 5,800 v1.1.0 Updated 2026-03-10

Install

Claude Code

Copy the SKILL.md file to your project's .claude/skills/ directory

About This Skill

Smart Contract Auditor performs comprehensive security reviews of Solidity and Vyper smart contracts. It checks for known vulnerability patterns, gas inefficiencies, and deviations from best practices — producing structured audit reports with severity ratings and remediation guidance.

How It Works

  1. Code ingestion — Reads Solidity/Vyper source files including imported dependencies and interfaces
  2. Vulnerability scanning — Checks for reentrancy, integer overflow/underflow, unchecked external calls, front-running risks, and access control issues
  3. Gas analysis — Identifies gas-heavy patterns (storage reads in loops, redundant SLOADs, unoptimized data types)
  4. Standard compliance — Verifies ERC standard implementations for missing functions, incorrect return values, or event emissions
  5. Report generation — Produces a findings report categorized by severity (Critical, High, Medium, Low, Informational)

Best For

  • DeFi teams preparing contracts for professional audit
  • Developers doing self-review before submitting to audit firms
  • Educational review of smart contract security patterns
  • Quick security checks on forked or modified protocol code

Scope and Limitations

This is a static analysis tool that catches common vulnerability patterns. It does not replace a professional audit from firms like Trail of Bits, OpenZeppelin, or Consensys Diligence. Complex business logic vulnerabilities, economic exploits, and cross-contract interaction risks require human expert analysis.

Use Cases

  • Pre-audit review of DeFi protocol smart contracts
  • Identifying reentrancy, overflow, and access control vulnerabilities
  • Gas optimization analysis for frequently called functions
  • Checking ERC-20/ERC-721/ERC-1155 standard compliance
  • Reviewing upgrade proxy patterns for storage collision risks

Pros & Cons

Pros

  • + Covers major Solidity vulnerability categories
  • + Gas optimization suggestions for cost reduction
  • + Structured severity-rated audit reports
  • + ERC standard compliance verification

Cons

  • - Static analysis only — cannot catch all runtime vulnerabilities
  • - Does not replace professional audit firms for mainnet deployments
  • - Complex cross-contract and economic exploits require human expert review

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