About

Imported from personamanagmentlayer/pcl (stdlib/domains/web3-expert/SKILL.md). Install upstream with npx skills add personamanagmentlayer/pcl --skill web3-expert. Copyright stays with the author.

Web3 Expert

Name: web3-expert
Author: personamanagmentlayer

Build production-ready Web3 applications including smart contracts, dApps, DeFi protocols, and decentralized storage solutions.

Learning Objectives

Master smart contract development with Solidity
Build decentralized applications (dApps)
Implement DeFi protocols and mechanisms
Integrate Web3.js and ethers.js libraries
Deploy and interact with IPFS for decentralized storage

Prerequisites

Strong JavaScript/TypeScript fundamentals
Understanding of blockchain concepts
Knowledge of cryptographic principles
Familiarity with Ethereum ecosystem

Core Concepts

Smart Contracts

Self-executing code deployed on blockchain networks that automatically enforce agreements without intermediaries. Written in Solidity for EVM-compatible chains, they enable trustless, transparent, and immutable transactions.

Decentralized Applications (dApps)

Applications with backend logic running on decentralized networks rather than centralized servers. Frontend interfaces interact with smart contracts through Web3 libraries, providing censorship-resistant and transparent functionality.

DeFi (Decentralized Finance)

Financial instruments and protocols built on blockchain without traditional intermediaries. Includes lending/borrowing, decentralized exchanges (DEXs), yield farming, liquidity pools, and automated market makers (AMMs).

Web3 Libraries

JavaScript/TypeScript libraries (Web3.js, ethers.js) that enable interaction with Ethereum nodes, signing transactions, reading blockchain state, and connecting wallet providers like MetaMask.

IPFS (InterPlanetary File System)

Peer-to-peer distributed file system for decentralized storage. Content-addressed storage ensures immutability and enables efficient distribution without centralized servers.

Best Practices

Smart Contract Development

Follow checks-effects-interactions pattern to prevent reentrancy
Use OpenZeppelin contracts for standard implementations
Implement comprehensive access controls and pausability
Always validate inputs and handle edge cases
Emit events for all state changes for frontend tracking
Use SafeMath or Solidity 0.8+ for overflow protection
Conduct thorough testing and external audits before mainnet

DeFi Protocol Design

Implement circuit breakers for emergency situations
Use oracle price feeds with safeguards against manipulation
Design with composability in mind for protocol integration
Calculate slippage protection for swaps and liquidity
Implement time-locks for critical parameter changes
Consider MEV (Maximal Extractable Value) attack vectors
Provide clear documentation for economic mechanisms

dApp Frontend Integration

Handle network switches and wallet disconnections gracefully
Always estimate gas before transactions
Implement proper error handling for user experience
Cache blockchain data appropriately to reduce RPC calls
Use events and filters for real-time updates
Implement transaction status monitoring and retries
Provide clear feedback on pending transactions

IPFS Best Practices

Pin important content to ensure availability
Use content addressing for immutability guarantees
Implement gateway fallbacks for reliability
Consider file size limits and chunking strategies
Store IPFS CIDs on-chain, not full content
Use encryption for sensitive data before upload
Implement content moderation for user-generated data

Anti-Patterns

Common Mistakes

Storing large data on-chain instead of using IPFS
Not implementing reentrancy guards on token transfers
Hardcoding gas limits instead of estimating
Ignoring failed transactions without user feedback
Using floating point arithmetic in Solidity
Not validating external contract calls
Deploying without comprehensive test coverage
Ignoring smart contract upgrade strategies

Security Issues

Unchecked external calls leading to reentrancy
Integer overflow/underflow in calculations
Front-running vulnerabilities in DEX trades
Oracle manipulation in price feeds
Centralization risks in "decentralized" systems
Private key exposure in frontend code
Missing access controls on critical functions
Inadequate testing of edge cases and attack vectors

Reference Documentation

Detailed material lives alongside this skill and is read on demand:

Code Examples — Advanced Smart Contract: ERC-20 Token with Governance, DeFi: Automated Market Maker (AMM) with Liquidity Pools, Web3 dApp Frontend Integration

Resources

Development Tools

Hardhat - Ethereum development environment
Foundry - Fast Solidity testing framework
Remix IDE - Browser-based Solidity IDE
Truffle Suite - Smart contract development tools
OpenZeppelin Contracts - Secure contract libraries
Tenderly - Smart contract monitoring and debugging

Web3 Libraries

ethers.js - Complete Ethereum library
Web3.js - Ethereum JavaScript API
wagmi - React hooks for Ethereum
viem - TypeScript Ethereum interface
RainbowKit - Wallet connection UI
WalletConnect - Multi-wallet protocol

DeFi Resources

Uniswap V3 - Leading DEX protocol
Aave - Lending protocol
Compound - DeFi lending platform
Curve Finance - Stablecoin AMM
Chainlink - Decentralized oracles
The Graph - Blockchain indexing protocol

Learning & Standards

Ethereum.org - Official documentation
Solidity docs - Language reference
EIPs - Ethereum Improvement Proposals
DeFi Developer Roadmap
Smart Contract Best Practices
CryptoZombies - Interactive Solidity tutorial

Part of the PCL Standard Library - Build the decentralized future with Web3 technologies.

Use it

Copy one of these into your project. Installing also returns the manifest and these snippets.

yaml

targets:
  - https://api.opensmartroute.ai/api/v1/registry/personamanagmentlayer-pcl-web3-expert/manifest   # or paste the manifest below

Manifest

An Open Capability Manifest: the router reads it to know what this does, what it costs and when to pick it.

personamanagmentlayer-pcl-web3-expert.ocm.jsonjson

{
  "ocm": "1",
  "id": "personamanagmentlayer-pcl-web3-expert",
  "kind": "skill",
  "name": "web3-expert",
  "description": "Build production-ready Web3 applications including smart contracts, dApps, DeFi protocols, and decentralized storage solutions. Use when the user mentions Web3, smart contracts or Solidity, dApps, DeFi protocols, ethers.js or web3.js, IPFS, or on-chain integration with Ethereum-compatible networks.",
  "publisher": "personamanagmentlayer",
  "version": "1.0.0",
  "capabilities": {
    "domains": [
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    "tags": [
      "skill-md",
      "web3",
      "blockchain",
      "smart-contracts",
      "solidity",
      "dapps",
      "defi",
      "ipfs",
      "ethereum",
      "web3js"
    ],
    "languages": [
      "en"
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  },
  "quality_prior": 0.6,
  "examples": [
    "Build production-ready Web3 applications including smart contracts, dApps, DeFi protocols, and decentralized storage solutions. Use when the user mentions Web3, smart contracts or Solidity, dApps, DeFi protocols, ethers.js or web3.js, IPFS, or on-chain integration with Ethereum-compatible networks."
  ],
  "primary": false,
  "metadata": {
    "source": {
      "provider": "skills.sh",
      "repository": "https://github.com/personamanagmentlayer/pcl",
      "path": "stdlib/domains/web3-expert/SKILL.md",
      "ref": "HEAD",
      "url": "https://github.com/personamanagmentlayer/pcl/blob/HEAD/stdlib/domains/web3-expert/SKILL.md",
      "key": "personamanagmentlayer/pcl/stdlib/domains/web3-expert/SKILL.md"
    },
    "allowed_tools": [
      "Read",
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      "Bash",
      "Grep",
      "Glob"
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  "instructions": "# Web3 Expert\n\nBuild production-ready Web3 applications including smart contracts, dApps, DeFi protocols, and decentralized storage solutions.\n\n## Learning Objectives\n\n- Master smart contract development with Solidity\n- Build decentralized applications (dApps)\n- Implement DeFi protocols and mechanisms\n- Integrate Web3.js and ethers.js libraries\n- Deploy and interact with IPFS for decentralized storage\n\n## Prerequisites\n\n- Strong JavaScript/TypeScript fundamentals\n- Understanding of blockchain concepts\n- Knowledge of cryptographic principles\n- Familiarity with Ethereum ecosystem\n\n## Core Concep",
  "cost": {
    "context_tokens": 1429
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}

Fetch it by URL: GET /api/v1/registry/personamanagmentlayer-pcl-web3-expert/manifest?version=1.0.0

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