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.
git clone --depth 1 https://github.com/MetaMask/metamask-connect-cursor-pluginWrote 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/rules/metamask/metamask-connect-cursor-plugin/metamask-connect-best-practices)<a href="https://agentmods.dev/rules/metamask/metamask-connect-cursor-plugin/metamask-connect-best-practices"><img src="https://agentmods.dev/badge/rules/metamask/metamask-connect-cursor-plugin/metamask-connect-best-practices/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/rules/metamask/metamask-connect-cursor-plugin/metamask-connect-best-practices"><img src="https://agentmods.dev/badge/rules/metamask/metamask-connect-cursor-plugin/metamask-connect-best-practices.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 | $0.01401 | $0.01401 |
| Opus 5 | $0.00700 | $0.00700 |
| Sonnet 5 | $0.00280 | $0.00280 |
| Haiku 4.5 | $0.00140 | $0.00140 |
Grade A, and why
metamask-connect-best-practices 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 9d 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 — 75 lines — stays where its author put it; the contents beside it link to each section on GitHub.
MetaMask Connect Best Practices
Import Paths
- Import EVM client from
@metamask/connect-evm - Import multichain client from
@metamask/connect-multichain - Import Solana client from
@metamask/connect-solana - Never import from internal sub-packages like
@metamask/connect/dist/...or@metamask/connect-evm/src/... - Use the wagmi connector from the published entrypoint your installed version exposes; do not assume
@metamask/connect-evm/wagmiexists unless your package version exports it @metamask/connect-multichainis a regular dependency of both@metamask/connect-evmand@metamask/connect-solana(since 2.1.0) and is installed transitively — you do not need to add it yourself. (Only the 2.0.0 releases briefly made it a peer dependency.) Both clients warn at runtime on duplicate or mismatched@metamask/connect-multichainresolutions; if you do depend on it directly (e.g. to usecreateMultichainClient), use^1.0.0— it is a stable 1.x package following strict semver
Required Configuration
dapp.nameis always required — it appears in the MetaMask connection promptdapp.urlis required in Node.js and React Native environments (nowindow.locationavailable)dapp.urlin browser can default towindow.location.hrefbut explicit is saferdapp.iconUrlis optional — displayed in MetaMask connection UIdapp.base64Iconis an alternative toiconUrl— pass a base64-encoded icon string directly (useful when a hosted URL is unavailable, e.g., in React Native)
Supported Networks
- Every chain the dApp interacts with must be in
api.supportedNetworkswith a reachable RPC URL - Use
getInfuraRpcUrls({ infuraApiKey: 'API_KEY', chainIds?: Hex[] })to populate common EVM chains — it returns a hex-keyed map forcreateEVMClient - Use
getInfuraRpcUrls({ infuraApiKey: 'API_KEY', caipChainIds?: string[] })to populate CAIP-2 chains forcreateMultichainClient - Use
getInfuraRpcUrls({ infuraApiKey: 'API_KEY', networks: SolanaNetwork[] })from@metamask/connect-solanato populate a network-name-keyed map forcreateSolanaClient—networksis required - Chain
0x1(Ethereum mainnet) is auto-included in the EVMconnect()permission request if not specified — but it is not auto-added tosupportedNetworks, which must list every chain explicitly - Making an RPC request whose active chain is missing from
supportedNetworksthrows "not configured in supportedNetworks" (the check runs in the provider'srequest()path, not inconnect())
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.
- 9d ago First seen · 75 lines · 1,401 tokens per session scan A 8376d3159607
metamask-connect-best-practices is a cursor rule published in the GitHub repository MetaMask/metamask-connect-cursor-plugin (2 stars, last pushed 2mo ago), licensed MIT. It adds 1,401 tokens to every session, about $0.0070 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 2026-08-31.
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