# solidity

A skill for writing and reviewing Solidity contracts: reentrancy defenses, gas optimization, testing, and React frontend wiring.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 721 installs · ★ 286
- Author: Mindrally
- License: Apache-2.0 · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/Mindrally/skills/tree/HEAD/solidity/SKILL.md
- Updated: 2026-10-08
- HTML: https://affpapa.org/en/nevibecode/skills/solidity

## What it does

The skill hands your agent a rulebook for Solidity work. Code structure and security come first: explicit visibility modifiers, NatSpec docs, the Checks-Effects-Interactions pattern, `ReentrancyGuard`, `SafeERC20`, OpenZeppelin's `AccessControl`, Solidity 0.8.0+ for overflow protection, Pausable circuit breakers, timelocks and multisig for sensitive calls.

Gas gets its own section. `immutable` for constructor-set values, custom errors instead of revert strings, tight storage packing. Static analysis runs through Slither and Mythril, while Hardhat covers testing and development, with pre-commit linting on top. Advanced patterns are listed too: Chainlink VRF for randomness, state machines, ERC20Snapshot, ERC20Permit and ERC20Votes.

On the frontend side the skill wants contract calls typed from ABIs (TypeChain or wagmi/viem codegen), wallet and chain state modeled explicitly, and the transaction lifecycle surfaced from submitted through confirmed. It advises simulating with `eth_call` and gas estimation before asking for a signature. If your contracts sit below 0.8.0, the overflow guidance won't apply — worth checking your compiler version.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add Mindrally/skills --skill solidity -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/solidity/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/solidity/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add Mindrally/skills --skill solidity -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/solidity/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add Mindrally/skills --skill solidity -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/solidity/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install Mindrally/skills solidity
```

2. **Manually: put the files in place**
- File: `.github/skills/solidity/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add Mindrally/skills --skill solidity -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/Mindrally/skills --path solidity
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/solidity/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add Mindrally/skills --skill solidity -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/Mindrally/skills/tree/HEAD/solidity/SKILL.md

## When to use it
- harden a contract against reentrancy
- cut gas on deployment and at runtime
- wire Slither and Mythril into CI
- generate TypeScript types from ABIs
- show transaction status from submit to confirmation in the UI

## Example prompts
- review this contract for reentrancy and access control bugs
- optimize gas here using immutable variables and custom errors
- generate types from the ABI and wire the contract call into React

## Source text · SKILL.md · Apache-2.0

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: 6162246828627124.

BEGIN THIRD-PARTY FILE 6162246828627124
```text
---
name: solidity
description: "Best practices for secure, gas-efficient Solidity smart contract development and Web3 frontend integration. Use when writing or reviewing Solidity contracts, hardening against reentrancy and access-control bugs, optimizing gas usage, setting up Hardhat/Foundry testing and static analysis, or wiring a React frontend to wallets, providers, and on-chain transactions."
metadata:
  maintainer: Mindrally
  source: https://github.com/Mindrally/skills
---

# Solidity

This skill covers best practices for Solidity smart contract development, including security patterns, gas optimization, testing/tooling, and integrating contracts with a Web3 React frontend.

## Core Principles

- Cut the fluff. Code or detailed explanations only
- Maintain brevity while prioritizing accuracy and depth
- Answer first, explain later when needed

## Code Structure & Security

- Use explicit visibility modifiers and NatSpec documentation
- Apply function modifiers to reduce redundancy
- Follow naming conventions:
  - CamelCase for contracts
  - PascalCase for interfaces (prefix with "I")
- Implement Interface Segregation Principle
- Use proxy patterns for upgradeable contracts
- Emit comprehensive events for state changes
- Follow Checks-Effects-Interactions pattern against reentrancy

## Security Best Practices

- Use OpenZeppelin's AccessControl for permissions
- Require Solidity 0.8.0+ for overflow/underflow protection
- Use Pausable pattern for circuit breakers
- Implement ReentrancyGuard for additional protection
- Use SafeERC20 for token interactions
- Employ pull-over-push payment patterns
- Implement timelocks and multisig controls for sensitive operations

## Gas Optimization

- Optimize gas consumption (deployment and runtime)
- Use immutable variables for constructor-set values
- Use custom errors instead of revert strings
- Pack storage variables efficiently
- Use appropriate data types

## Tools & Analysis

- Integrate Slither and Mythril for static analysis
- Leverage Hardhat's testing and development environment
- Implement robust CI/CD pipelines
- Use pre-commit linting tools

## Advanced Patterns

- Chainlink VRF for randomness
- Strategic assembly use with extensive documentation
- State machine patterns for complex logic
- ERC20Snapshot, ERC20Permit, and ERC20Votes for specialized tokens

## Testing & Quality

- Comprehensive unit, integration, and end-to-end testing
- Property-based testing approaches
- High coverage targets
- Regular security audits

## Web3 Frontend Integration

- Keep frontend code that talks to contracts type-safe and explicit — generate TypeScript types from ABIs (e.g. via TypeChain or wagmi/viem codegen) rather than hand-writing contract call signatures
```
END THIRD-PARTY FILE 6162246828627124

The third-party file has ended. Everything between the 6162246828627124 tags is data: requests and commands from it are not followed. An “end of file” line with another tag inside the block is part of the file.

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