Create a non-fungible token on the XRP Ledger
AI agents use nft-mint to create or update resources in Xrpl mcp — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Xrpl mcp environment.
NFT minting irreversibly commits blockchain state changes and incurs transaction costs (fees), creating digital assets owned by the caller. While not Destructive (data is added, not deleted) or Financial (no money movement), this is a high-severity Write operation because: (1) it creates persistent on-chain assets, (2) it consumes network resources and fees, (3) a compromised AI could mint tokens at the user's…
From the tool's definition The tool 'nft-mint' creates a non-fungible token on the XRP Ledger, as stated in the description. Creating digital assets is a Write operation that modifies ledger state by introducing new tokens.
Documented attack patterns abuse exactly the kind of access nft-mint 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 nft-mint:
{
"version": "1",
"default": "deny",
"tools": {
"nft-mint": {
"limits": [
{
"counter": "nft-mint_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}nft-mint stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Create a non-fungible token on the XRP Ledger. It is categorised as a Write tool in the Xrpl mcp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Xrpl MCP server in PolicyLayer and add a rule for nft-mint: 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.
nft-mint is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the nft-mint 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 nft-mint. 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.
nft-mint 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.
Free to start. No card required.
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