mpt-issuance-set

THE RISK

Medium Risk

Why mpt-issuance-set needs a policy

This tool modifies token issuance properties (lock/unlock, holder authorization changes), which are reversible write operations on the XRP Ledger. While it doesn't delete data, modifying token issuance properties—especially locking mechanisms and authorization rules—affects token lifecycle and holder permissions.

From the tool's definition Modify the properties of an existing Multi-Purpose Token (MPT) issuance. Can lock/unlock the issuance or update holder authorization.

Documented attack patterns abuse exactly the kind of access mpt-issuance-set gives an agent:

POLICY

How to control mpt-issuance-set

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 mpt-issuance-set:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "mpt-issuance-set": {
      "limits": [
        {
          "counter": "mpt-issuance-set_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

mpt-issuance-set 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.

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

LIMIT THIS TOOL →

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about mpt-issuance-set

What does the mpt-issuance-set tool do? +

Modify the properties of an existing Multi-Purpose Token (MPT) issuance. Can lock/unlock the issuance or update holder authorization. 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 mpt-issuance-set? +

Register the Xrpl MCP server in PolicyLayer and add a rule for mpt-issuance-set: 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 mpt-issuance-set? +

mpt-issuance-set is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit mpt-issuance-set? +

Yes. Add a rate_limit block to the mpt-issuance-set 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 mpt-issuance-set completely? +

Set action: deny in the PolicyLayer policy for mpt-issuance-set. 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 mpt-issuance-set? +

mpt-issuance-set 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.

Enforce policy on every Xrpl mcp tool call.

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

CHECK YOUR STACK →