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 j4flmao/agent-skills --skill blockchain-web3git clone --depth 1 https://github.com/j4flmao/agent-skillsWrote 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/j4flmao/agent-skills/blockchain-web3)<a href="https://agentmods.dev/skills/j4flmao/agent-skills/blockchain-web3"><img src="https://agentmods.dev/badge/skills/j4flmao/agent-skills/blockchain-web3/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/j4flmao/agent-skills/blockchain-web3"><img src="https://agentmods.dev/badge/skills/j4flmao/agent-skills/blockchain-web3.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Excessive Agency · line 395 Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
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 | $0.00128 | $0.05204 |
| Opus 5 | $0.00064 | $0.02602 |
| Sonnet 5 | $0.00026 | $0.01041 |
| Haiku 4.5 | $0.00013 | $0.00520 |
Grade A, and why
blockchain-web3 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 5d 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 — 597 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Blockchain Web3
Purpose
Guide web3 frontend and dApp development covering library selection, wallet integration, contract interaction, transaction management, event handling, and account abstraction. Focuses on TypeScript-based frontend patterns.
Agent Protocol
Trigger
"web3", "ethers.js", "viem", "wagmi", "web3.js", "metamask", "phantom wallet", "walletconnect", "dapp", "decentralized app", "react blockchain", "nextjs web3", "ethers contract", "contract interaction", "read contract", "write contract", "send transaction", "sign message", "eip-1193", "eip-4337", "account abstraction", "multicall", "rpc provider", "infura", "alchemy", "blockchain frontend", "typechain", "wagmi hooks", "viem client", "user operation", "sign typed data"
Input Context
- Frontend framework (React/Next.js/Vanilla)
- Blockchain networks (Ethereum/L2/Solana/Multi-chain)
- Library preference (viem+wagmi/ethers.js/web3.js)
- Features needed (read/write/events/wallet/signing)
- Account abstraction requirements (ERC-4337)
- Performance requirements (RPC calls, caching, multicall)
Output Artifact
Web3 frontend architecture: library selection, provider setup, wallet connection flow, contract interaction patterns, event handling, and transaction management.
Response Format
- Library selection: viem/wagmi vs ethers.js vs web3.js rationale
- Provider setup: chain config, RPC endpoints, fallback providers
- Wallet connection: injected providers (EIP-6963), WalletConnect, smart accounts (ERC-4337)
- Contract interaction: read/write patterns, event listening, multicall
- Transaction flow: gas estimation, simulation, submission, confirmation tracking
- Error handling: revert reasons, user rejection, network errors, rate limiting
Completion Criteria
- Library selection justified with comparison against alternatives
- Provider setup handles: multiple chains, fallback RPCs, rate limiting
- Wallet connection supports: EIP-1193, EIP-6963, WalletConnect
- Transaction management handles: gas estimation, simulation, confirmation, error states
- Event handling covers: subscription, polling, historical query, reorg handling
What ships with it
18 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- references/blockchain-web3-advanced.md 2.5 KB
- references/blockchain-web3-fundamentals.md 2.5 KB
- references/cross-chain-dapp-patterns.md 22 KB
- references/dapp-architecture.md 7.4 KB
- references/ethers-viem-wagmi.md 5.3 KB
- references/gas-optimization-management.md 17 KB
- references/providers-rpc.md 6.0 KB
- references/reference_guide_1.md 205 KB
- references/reference_guide_2.md 205 KB
- references/reference_guide_3.md 205 KB
- references/reference_guide_4.md 205 KB
- references/reference_guide_5.md 205 KB
- references/reference_guide_6.md 205 KB
- references/reference_guide_7.md 205 KB
- references/reference_guide_8.md 205 KB
- references/wallet-integration.md 6.1 KB
- references/web3-hooks.md 8.8 KB
- references/web3-react-patterns.md 3.3 KB
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.
- 5d ago First seen · 597 lines · 128 tokens per session scan A 7568c4e232d0
blockchain-web3 is a skill published in the GitHub repository j4flmao/agent-skills (22 stars, last pushed 2d ago), licensed MIT. It adds 128 tokens to every session and 5,204 once invoked, about $0.0006 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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