# Solidity Security > Master smart contract security best practices to prevent common vulnerabilities and implement secure Solidity patterns. Use when writing smart contracts, auditing existing contracts, or implementin... - Skill: `rootcastleco/solidity-security` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds add rootcastleco/solidity-security` - Raw SKILL.md: https://api.skillmd.com/api/skills/rootcastleco/solidity-security/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Security - Author: rootcastleco (https://skillmd.com/u/rootcastleco) - Updated: 2026-09-08 - Page: https://skillmd.com/skills/rootcastleco/solidity-security --- > ⚠️ **AUTHORIZED USE ONLY** — This skill is intended for authorized security professionals only. Use only against systems you own or have explicit written permission to test. Unauthorized use may violate applicable laws. # Solidity Security Master smart contract security best practices, vulnerability prevention, and secure Solidity development patterns. ## Use this skill when - 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 ## Do not use this skill when - The task is unrelated to solidity security - You need a different domain or tool outside this scope ## Instructions - Clarify goals, constraints, and required inputs. - Apply relevant best practices and validate outcomes. - Provide actionable steps and verification. - If detailed examples are required, open `resources/implementation-playbook.md`. ## Resources - `resources/implementation-playbook.md` for detailed patterns and examples. --- > 🏰 **Rei Skills** — Curated by [Rootcastle Engineering & Innovation](https://www.rootcastle.com) | Batuhan Ayrıbaş > Engineering Beyond Boundaries | admin@rootcastle.com