Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add hoangatg/ai-agent-toolkit --skill web3-blockchaingit clone --depth 1 https://github.com/hoangatg/ai-agent-toolkitWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/hoangatg/ai-agent-toolkit/web3-blockchain)<a href="https://agentmods.dev/skills/hoangatg/ai-agent-toolkit/web3-blockchain"><img src="https://agentmods.dev/badge/skills/hoangatg/ai-agent-toolkit/web3-blockchain/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/hoangatg/ai-agent-toolkit/web3-blockchain"><img src="https://agentmods.dev/badge/skills/hoangatg/ai-agent-toolkit/web3-blockchain.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00029 | $0.00864 |
| Opus 5 | $0.00015 | $0.00432 |
| Sonnet 5 | $0.00006 | $0.00173 |
| Haiku 4.5 | $0.00003 | $0.00086 |
Grade A, and why
web3-blockchain scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 132 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Web3 & Blockchain
Decentralized. Trustless. Immutable. Build applications without intermediaries.
1. Technology Stack
Blockchain Selection
| Blockchain | Best For | Language |
|---|---|---|
| Ethereum | DeFi, NFTs, dApps | Solidity |
| Solana | High throughput, low fees | Rust |
| Polygon | Ethereum L2, low cost | Solidity |
| Base | Coinbase L2, consumer apps | Solidity |
| Near | Developer-friendly | Rust/JS |
Development Tools
| Tool | Purpose |
|---|---|
| Hardhat | Ethereum dev environment |
| Foundry | Fast, Solidity-native testing |
| Remix IDE | Browser-based Solidity IDE |
| Anchor | Solana framework |
| ethers.js / viem | JS blockchain interaction |
| wagmi | React hooks for Ethereum |
2. Smart Contract Principles
Solidity Best Practices
| Principle | Application |
|---|---|
| Checks-Effects-Interactions | Validate → update state → external calls |
| Minimal storage | Storage is expensive ($$$) |
| Reentrancy guard | Use OpenZeppelin ReentrancyGuard |
| Access control | Ownable, roles-based |
| Events | Emit for all state changes |
| Upgradability | Proxy pattern (with caution) |
3. dApp Architecture
Frontend Integration
User → Wallet (MetaMask) → dApp Frontend → Smart Contract → Blockchain
↓
Backend (indexer, APIs)
| Layer | Technology |
|---|---|
| Frontend | React + wagmi + viem |
| Wallet | MetaMask, WalletConnect, Coinbase Wallet |
| Indexing | The Graph, custom indexer |
| Storage | IPFS, Arweave (off-chain data) |
| Backend | Node.js for off-chain logic |
4. Security
Common Vulnerabilities
| Vulnerability | Prevention |
|---|---|
| Reentrancy | Checks-Effects-Interactions, ReentrancyGuard |
| Integer overflow | Solidity 0.8+ (built-in checks) |
| Front-running | Commit-reveal schemes |
| Access control | Role-based, multi-sig |
| Oracle manipulation | Use Chainlink, multiple sources |
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 8d ago First seen · 132 lines · 29 tokens per session scan A 43bc0f58b473
web3-blockchain is a skill published in the GitHub repository hoangatg/ai-agent-toolkit (1 stars, last pushed 5mo ago), licensed MIT. It adds 29 tokens to every session and 864 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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