Agent skill
smart-contract
Multi-chain smart contract development skill for Ethereum, Solana, and Move-based chains. This skill should be used when: writing smart contracts (ERC20/ERC721/ERC1155/esToken/custom), auditing contract security vulnerabilities, generating Foundry test cases, optimizing gas usage, or automating deployment workflows. Triggers on queries like "write a contract", "audit this contract", "generate tests", "optimize gas", or "deploy contract".
Install this agent skill to your Project
npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/development/smart-contract
SKILL.md
Smart Contract Development Skill
Multi-chain smart contract development with security-first approach.
Capabilities
| Capability | Description |
|---|---|
| Contract Writing | ERC20, ERC721, ERC1155, esToken (vesting/locking), custom logic |
| Security Audit | Reentrancy, overflow, access control, flash loan attacks, etc. |
| Test Generation | Foundry test cases with fuzz testing and invariant tests |
| Gas Optimization | Storage packing, calldata optimization, assembly tricks |
| Deployment | Multi-chain deployment scripts with verification |
Supported Chains
- EVM: Ethereum, Polygon, Arbitrum, Optimism, BSC, Avalanche
- Solana: Anchor framework
- Move: Aptos, Sui
Workflow
Contract Development
- Clarify requirements (token type, features, chain)
- Load appropriate template from
assets/templates/ - Implement with OpenZeppelin base contracts where applicable
- Apply gas optimizations from
references/gas-optimization.md - Generate Foundry tests using patterns from
references/foundry-patterns.md
Security Audit
- Run
scripts/security_scan.pyfor automated detection - Manual review using
references/vulnerabilities.mdchecklist - Report findings with severity levels (Critical/High/Medium/Low/Info)
- Suggest fixes with code examples
Test Generation
- Identify contract functions and state transitions
- Apply patterns from
references/foundry-patterns.md - Include fuzz tests for numeric inputs
- Include invariant tests for protocol properties
Resources
References (load as needed)
| File | Purpose | When to load |
|---|---|---|
references/vulnerabilities.md |
Common vulnerability patterns | During security audits |
references/best-practices.md |
Solidity/Rust best practices | During contract writing |
references/gas-optimization.md |
Gas optimization techniques | When optimizing contracts |
references/foundry-patterns.md |
Test patterns and examples | When generating tests |
Templates (copy and modify)
| Template | Use Case |
|---|---|
assets/templates/erc20-base.sol |
Fungible token contracts |
assets/templates/erc721-base.sol |
NFT contracts |
assets/templates/estoken-base.sol |
Vesting/locking token (esToken) |
assets/templates/test-base.t.sol |
Foundry test scaffold |
Scripts
| Script | Purpose |
|---|---|
scripts/security_scan.py |
Automated vulnerability detection |
Security Audit Checklist
When auditing, check each category from references/vulnerabilities.md:
- Reentrancy: External calls before state updates
- Access Control: Missing modifiers, centralization risks
- Integer Issues: Overflow/underflow (pre-0.8.0), division by zero
- Flash Loan Attacks: Price manipulation, governance attacks
- Front-running: MEV vulnerabilities, commit-reveal patterns
- Logic Errors: Off-by-one, incorrect comparisons
- Denial of Service: Unbounded loops, block gas limit
Output Format
Claude responds in Chinese per CLAUDE.md.
Audit Report Structure
## Security Audit Report
### Summary
- Contracts audited: [list]
- Lines of code: [count]
- Findings: [X Critical, Y High, Z Medium, W Low]
### Findings
#### [C-01] Critical: [Title]
- **Location**: `Contract.sol:L42`
- **Impact**: [description]
- **Proof of Concept**: [code]
- **Recommendation**: [fix]
Contract Delivery Structure
## Contract: [Name]
### Features
- [list features]
### Deployment
1. [steps]
### Files
- `src/[Contract].sol` - Main contract
- `test/[Contract].t.sol` - Tests
- `script/Deploy[Contract].s.sol` - Deployment script
Gas Optimization Priority
Apply optimizations in this order (from references/gas-optimization.md):
- Storage layout (packing, cold/warm slots)
- Calldata vs memory
- Unchecked blocks for safe math
- Custom errors vs require strings
- Assembly for critical paths (last resort)
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