get_nft_holdings

THE RISK

Low Risk

Why get_nft_holdings needs a policy

This tool retrieves and lists existing NFT holdings data for a given address. It performs a read-only query operation without creating, modifying, deleting, or executing any actions. The incomplete description does not suggest any capabilities beyond data retrieval.

From the tool's definition Tool name 'get_nft_holdings' and description 'Get all NFT holdings for an address, including collection information' indicate a query/retrieval operation with no modification or side effects.

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

POLICY

How to control get_nft_holdings

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

policy.json

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

get_nft_holdings 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 Story SDK MCP Server — 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

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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 get_nft_holdings

What does the get_nft_holdings tool do? +

Get all NFT holdings for an address, including collection information and. It is categorised as a Read tool in the Story SDK MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_nft_holdings? +

Register the Story SDK MCP Server MCP server in PolicyLayer and add a rule for get_nft_holdings: 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 Story SDK MCP Server. Nothing to install.

What risk level is get_nft_holdings? +

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

Can I rate-limit get_nft_holdings? +

Yes. Add a rate_limit block to the get_nft_holdings 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 get_nft_holdings completely? +

Set action: deny in the PolicyLayer policy for get_nft_holdings. 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 get_nft_holdings? +

get_nft_holdings is provided by the Story SDK MCP Server MCP server (piplabs/story-mcp-hub). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Story SDK MCP Server tool call.

Start from Story SDK MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →