Transfer NFT between addresses
AI agents invoke transfer-nft to trigger actions in Xrpl mcp. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
Transferring an NFT on the XRP Ledger submits a blockchain transaction that moves a non-fungible token from one address to another. This is an on-chain operation with real asset implications. It spans Write and Execute (blockchain transaction submission), and since it involves transferring a digital asset of potential financial value, it is at least Execute-level.
From the tool's definition Transfer NFT between addresses
Documented attack patterns abuse exactly the kind of access transfer-nft gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Xrpl mcp, and nothing reaches the server without passing your rules. This is the rule we recommend for transfer-nft:
{
"version": "1",
"default": "deny",
"tools": {
"transfer-nft": {
"limits": [
{
"counter": "transfer-nft_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}transfer-nft stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
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Transfer NFT between addresses. It is categorised as a Execute tool in the Xrpl mcp MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Xrpl 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 Xrpl mcp. Nothing to install.
transfer-nft is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
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.
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.
transfer-nft is provided by the Xrpl MCP server (romthpt/mcp-xrpl). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Xrpl mcp, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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