transfer_nft

THE RISK

Critical Risk

Why transfer_nft needs a policy

NFT transfers on a blockchain are irreversible asset movements with financial value. The server context explicitly lists NFT operations and crypto transfers. While the description is empty (lowering confidence), the tool name and server context strongly imply an on-chain NFT transfer, which commits a financial asset. Financial > Destructive applies here as it moves a valuable asset permanently.

From the tool's definition Tool name 'transfer_nft' on a server described as handling 'multi-chain crypto operations: transfers, token management, DeFi, NFT, smart contracts'. NFT transfers move blockchain assets irreversibly between addresses.

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

POLICY

How to control transfer_nft

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "transfer_nft": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

Any call to transfer_nft is blocked until a human approves it. The rest of the server keeps working.

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

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EXPLORE

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Go deeper

Critical-risk tools in Waiaas → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Human-in-the-loop → When a tool call should wait for a person — and when policy can decide alone.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
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Rate Limiting MCP Tool Calls: A Practical Guide →

FAQ

Questions about transfer_nft

What does the transfer_nft tool do? +

transfer_nft. It is categorised as a Financial tool in the Waiaas MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on transfer_nft? +

Register the Waiaas MCP server in PolicyLayer and add a rule for transfer_nft: 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 Waiaas. Nothing to install.

What risk level is transfer_nft? +

transfer_nft is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit transfer_nft? +

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

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

transfer_nft is provided by the Waiaas MCP server (minhoyoo-iotrust/waiaas). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Waiaas tool call.

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

CHECK YOUR STACK →