nft-modify

Modify the URI of a dynamic NFT (dNFT) on the XRP Ledger. The NFT must have been minted with the tfMutable flag enabled. Only the issuer or their authorized minter can modify the URI.

SERVERXrpl mcp SOURCEromthpt/mcp-xrpl

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/romthpt-mcp-xrpl/nft-modify.md

WHAT IT DOES

What nft-modify does on Xrpl mcp

AI agents use nft-modify 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.

RISK

Why nft-modify is rated Medium

This tool modifies NFT metadata (the URI field) on the XRP Ledger. While it changes state, the modification is reversible (the URI can be changed again), distinguishing it from destructive operations. It does not delete data, execute arbitrary code, or involve financial transactions. The authorization requirement and XRP Ledger integration suggest it's scoped to NFT ownership.

From the tool's definition Tool description states it "Modify[s] the URI of a dynamic NFT" - a reversible modification of data on the ledger. The operation requires authorization (issuer or authorized minter only) and affects NFT metadata.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs nft-modify safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Xrpl mcp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For nft-modify, this is the rule to start with:

nft-modify Rate-limited

nft-modify 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "nft-modify": {
      "limits": [
        {
          "counter": "nft-modify_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Xrpl mcp, apply this rule, and every nft-modify call is checked against it from then on.

FAQ

Questions about nft-modify

What does the nft-modify tool do? +

Modify the URI of a dynamic NFT (dNFT) on the XRP Ledger. The NFT must have been minted with the tfMutable flag enabled. Only the issuer or their authorized minter can modify the URI. 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.

How do I enforce a policy on nft-modify? +

Register the Xrpl MCP server in PolicyLayer and add a rule for nft-modify: 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.

What risk level is nft-modify? +

nft-modify is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit nft-modify? +

Yes. Add a rate_limit block to the nft-modify 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 nft-modify completely? +

Set action: deny in the PolicyLayer policy for nft-modify. 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 nft-modify? +

nft-modify 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.

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