getNFTMetadata

THE RISK

Low Risk

Why getNFTMetadata needs a policy

This tool queries and retrieves NFT metadata without modifying, executing operations, deleting data, or moving funds. It is a read-only operation that fetches information from the blockchain. The severity is low as misuse would only expose or return publicly available metadata without causing harm.

From the tool's definition Tool description states 'Gets metadata for an NFT token by contract address and token ID' - a retrieval operation with no side effects.

Documented attack patterns abuse exactly the kind of access getNFTMetadata gives an agent:

POLICY

How to control getNFTMetadata

PolicyLayer is an MCP gateway — it sits between your AI agents and Agentek Eth, and nothing reaches the server without passing your rules. This is the rule we recommend for getNFTMetadata:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "getNFTMetadata": {}
  }
}

getNFTMetadata is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Agentek Eth — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Agentek Eth tools

Financial depositWETH Wrap native ETH into WETH (Wrapped ETH) by depositing into the WETH contract. You receive Financial intentAaveDeposit Deposits tokens into the Aave protocol to supply liquidity and earn interest. Financial intentAaveWithdraw Withdraws tokens from Aave, redeeming your supplied assets (aTokens). Financial intentApproveSlowTransfer Guardian approves a transfer in SLOW contract Financial intentDepositAcross Bridge ERC20 tokens cross-chain via Across Protocol. Automatically handles token approval Financial intentDepositToSlow Deposit tokens or ETH into SLOW contract with a timelock Financial intentTransfer Transfer ERC20 tokens or native ETH to an address or ENS name. Supports ENS resolution, au Financial intentTransferFrom Transfer ERC20 tokens from another address using transferFrom. Requires prior ERC20 approv

All 165 Agentek Eth tools →

Read tools on other servers

M-Team MCP Server get_torrent_detail YouTube MCP Server search_channel Android Forensics ADB MCP Server parse_browser_history 0xarchive web3_challenge

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about getNFTMetadata

What does the getNFTMetadata tool do? +

Gets metadata for an NFT token by contract address and token ID. It is categorised as a Read tool in the Agentek Eth MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on getNFTMetadata? +

Register the Agentek Eth MCP server in PolicyLayer and add a rule for getNFTMetadata: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Agentek Eth. Nothing to install.

What risk level is getNFTMetadata? +

getNFTMetadata is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit getNFTMetadata? +

Yes. Add a rate_limit block to the getNFTMetadata rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block getNFTMetadata completely? +

Set action: deny in the PolicyLayer policy for getNFTMetadata. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides getNFTMetadata? +

getNFTMetadata is provided by the Agentek Eth MCP server (nanidao/agentek). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Agentek Eth tool call.

Start from Agentek Eth, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →