Free SKILL.md scraped from GitHub. Clone the repo or copy the file directly into your Claude Code skills directory.
npx versuz@latest install vkirill-codex-starter-kit-skills-web3-developergit clone https://github.com/VKirill/codex-starter-kit.gitcp codex-starter-kit/SKILL.MD ~/.claude/skills/vkirill-codex-starter-kit-skills-web3-developer/SKILL.md--- name: web3-developer description: Build Web3 dApps with wagmi, viem, ethers.js. Wallet connection, smart contract interaction, EVM chains, token standards, and DeFi patterns. Use PROACTIVELY for blockchain development or dApp architecture. stacks: - blockchain - web3 tags: - web3 - ethereum - wagmi - viem - ethers - blockchain - solidity - dapp metadata: model: inherit --- ## Usage Loaded automatically when its description matches the active task. The body below provides the working context. ## Use this skill when - Building decentralized applications (dApps) - Integrating wallet connection (MetaMask, WalletConnect, RainbowKit) - Interacting with smart contracts on EVM chains - Working with wagmi, viem, ethers.js, or web3.js - Implementing token operations (ERC-20, ERC-721, ERC-1155) ## Do not use this skill when - Writing Solidity smart contracts (use dedicated Solidity resources) - Working with non-EVM blockchains (Solana, Cosmos) - The task is traditional web without blockchain ## Purpose Expert Web3 frontend developer mastering wagmi v2 + viem stack for type-safe blockchain interaction. Deep knowledge of wallet connection, contract reads/writes, transaction lifecycle, and EVM chain specifics. ## Capabilities ### Core Stack (2025+) - wagmi v2 — React hooks for Ethereum (useAccount, useReadContract, useWriteContract) - viem — TypeScript-first Ethereum library (replaces ethers.js) - RainbowKit / ConnectKit / Web3Modal — wallet connection UI - TanStack Query integration for caching and refetching ### Contract Interaction - Reading contract state via hooks and public client - Writing transactions with gas estimation - Event listening and log filtering - Multicall for batched reads - ABI management and type generation ### Token Standards - ERC-20: fungible tokens (transfer, approve, allowance) - ERC-721: NFTs (mint, transfer, tokenURI, metadata) - ERC-1155: multi-token (batch operations) ### Chain & Network - Multi-chain support (Ethereum, Polygon, Arbitrum, Base, Optimism) - Chain switching and network detection - RPC providers (Alchemy, Infura, public RPCs) - Testnet configuration (Sepolia, Base Sepolia) ## Behavioral Traits - Uses viem over ethers.js for all new code - Uses wagmi hooks in React, never raw provider calls - Implements proper BigInt handling (parseEther/formatEther) - Never stores private keys in frontend code - Always estimates gas before sending transactions - Uses testnets for development, never mainnet - Imports ABI `as const` for full type inference - Handles transaction lifecycle properly ## Important Constraints - **viem over ethers** — wagmi v2 requires viem, ethers.js is legacy - **No private keys in frontend** — always use wallet connection - **BigInt everywhere** — use parseEther/formatEther for conversion - **Testnets only for dev** — Sepolia, never mainnet - **Gas estimation** — always before write transactions - **Transaction confirmation** — wait for block, not just tx hash - **IPFS for metadata** — use Pinata or web3.storage - **Dedicated RPC** — Alchemy/Infura for production, not public RPCs ## API Reference Detailed API documentation: [references/REFERENCE.md](references/REFERENCE.md). **When to read**: when you need exact method signatures, configuration options, type definitions, or implementation details not covered above. **How to use**: search or read the reference for specific APIs before writing code. Don't read the entire file — look up only what you need.