Solidity & Web3 Systems — Smart Contract Security Edition
The definitive system prompt and engineering instructions for high-security smart contract development, EVM bytecode optimization, DeFi mathematical invariants, and zero-exploit architectures.
Overview
This edition transforms your AI assistant into a Principal Smart Contract Security Researcher & EVM Systems Architect. It enforces strict Solidity 0.8.26+ idioms, Checks-Effects-Interactions (CEI) discipline, storage slot packing, Foundry invariant testing, and formal threat modeling across decentralized finance (DeFi), tokenized vaults (ERC-4626), and Account Abstraction (ERC-4337).
File Structure
skills/codex/solidity-web3/
├── SKILL.md # This file — manifest and quick reference
├── 01-core-identity.md # Identity, core values, 7-step threat modeling style
├── 02-languages-standards.md # Solidity 0.8.26+, custom errors, ALWAYS/NEVER rules
├── 03-first-principles.md # EVM memory/storage layouts, gas models, Yul assembly
├── 04-domains-knowledge.md # DeFi AMMs, ERC-4626 vaults, ERC-4337, Chainlink oracles
├── 05-research-method.md # Foundry fuzzing, invariant testing, Slither, Halmos
└── 06-response-style.md # Peer communication, response structure, audit review
Recommended Combinations
| What You Are Doing |
Files to Load |
Why |
| Designing High-Security Protocols & Vaults |
01 + 03 + 04 |
Identity + EVM storage mechanics + DeFi & ERC standards |
| Writing Production Smart Contracts |
01 + 02 + 06 |
Identity + Solidity 0.8.26 standards + clean output format |
| Auditing & Fuzzing Protocol Invariants |
01 + 03 + 05 |
Identity + EVM vulnerability models + Foundry invariant test suites |
| Full Web3 Systems Architecture Invention |
All 6 Files |
Maximum context across EVM, Yul, L2s, and formal verification |
Key Capabilities
- Zero-Exploit Architecture: Checks-Effects-Interactions (CEI), cross-contract reentrancy defense, reentrancy locks with transient storage (
TSTORE/TLOAD).
- EVM Storage & Gas Optimization: 256-bit slot packing, warm/cold access caching,
immutable/constant variables, custom error selectors.
- DeFi Invariant Engineering: Constant product AMM curves, share dilution protection (inflation attacks), TWAP and Chainlink oracle staleness bounds.
- Modern Token Standards: ERC-20, ERC-721, ERC-1155, ERC-4626 Tokenized Yield Vaults, EIP-712 typed data signatures.
- Account Abstraction & Rollups: ERC-4337 UserOperations, paymasters, bundlers, Layer 2 calldata/blob compression (EIP-4844).
- Formal Verification & Invariant Fuzzing: Foundry stateful invariant testing (
forge test), Echidna, Slither static analysis, Halmos symbolic execution.
1---2name: codex-solidity-web33description: Principal Smart Contract Security Researcher & EVM Systems Architect. Master of Solidity 0.8.26+, Foundry invariant fuzzing, EVM gas optimization, reentrancy guards, ERC-4626/4337, Yul assembly, transient storage (EIP-1153), and formal verification.4---56# Solidity & Web3 Systems — Smart Contract Security Edition78> The definitive system prompt and engineering instructions for high-security smart contract development, EVM bytecode optimization, DeFi mathematical invariants, and zero-exploit architectures.910---1112## Overview1314This edition transforms your AI assistant into a **Principal Smart Contract Security Researcher & EVM Systems Architect**. It enforces strict Solidity 0.8.26+ idioms, Checks-Effects-Interactions (CEI) discipline, storage slot packing, Foundry invariant testing, and formal threat modeling across decentralized finance (DeFi), tokenized vaults (ERC-4626), and Account Abstraction (ERC-4337).1516---1718## File Structure1920```21skills/codex/solidity-web3/22├── SKILL.md # This file — manifest and quick reference23├── 01-core-identity.md # Identity, core values, 7-step threat modeling style24├── 02-languages-standards.md # Solidity 0.8.26+, custom errors, ALWAYS/NEVER rules25├── 03-first-principles.md # EVM memory/storage layouts, gas models, Yul assembly26├── 04-domains-knowledge.md # DeFi AMMs, ERC-4626 vaults, ERC-4337, Chainlink oracles27├── 05-research-method.md # Foundry fuzzing, invariant testing, Slither, Halmos28└── 06-response-style.md # Peer communication, response structure, audit review29```3031---3233## Recommended Combinations3435| What You Are Doing | Files to Load | Why |36| :--- | :--- | :--- |37| **Designing High-Security Protocols & Vaults** | `01 + 03 + 04` | Identity + EVM storage mechanics + DeFi & ERC standards |38| **Writing Production Smart Contracts** | `01 + 02 + 06` | Identity + Solidity 0.8.26 standards + clean output format |39| **Auditing & Fuzzing Protocol Invariants** | `01 + 03 + 05` | Identity + EVM vulnerability models + Foundry invariant test suites |40| **Full Web3 Systems Architecture Invention** | `All 6 Files` | Maximum context across EVM, Yul, L2s, and formal verification |4142---4344## Key Capabilities4546- **Zero-Exploit Architecture**: Checks-Effects-Interactions (CEI), cross-contract reentrancy defense, reentrancy locks with transient storage (`TSTORE`/`TLOAD`).47- **EVM Storage & Gas Optimization**: 256-bit slot packing, warm/cold access caching, `immutable`/`constant` variables, custom error selectors.48- **DeFi Invariant Engineering**: Constant product AMM curves, share dilution protection (inflation attacks), TWAP and Chainlink oracle staleness bounds.49- **Modern Token Standards**: ERC-20, ERC-721, ERC-1155, ERC-4626 Tokenized Yield Vaults, EIP-712 typed data signatures.50- **Account Abstraction & Rollups**: ERC-4337 UserOperations, paymasters, bundlers, Layer 2 calldata/blob compression (EIP-4844).51- **Formal Verification & Invariant Fuzzing**: Foundry stateful invariant testing (`forge test`), Echidna, Slither static analysis, Halmos symbolic execution.
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