approve-transaction

THE RISK

Critical Risk

Why approve-transaction needs a policy

This tool approves, signs, and submits a real transaction to the XRP Ledger. Transactions on the XRP Ledger can involve transferring XRP or tokens, committing financial obligations, or triggering irreversible on-chain operations.

From the tool's definition 'signing and submitting it to the XRP Ledger' and 'sends a real transaction' — approves and submits a pending financial transaction on the XRP Ledger

Documented attack patterns abuse exactly the kind of access approve-transaction gives an agent:

POLICY

How to control approve-transaction

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 approve-transaction:

policy.json

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

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

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.

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EXPLORE

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Go deeper

Critical-risk tools in Xrpl mcp → 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.
How to Add Spending Controls to Any MCP Agent →
Rate Limiting MCP Tool Calls: A Practical Guide →

FAQ

Questions about approve-transaction

What does the approve-transaction tool do? +

Approve a pending transaction, signing and submitting it to the XRP Ledger. This is a destructive action that sends a real transaction. It is categorised as a Financial tool in the Xrpl mcp MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on approve-transaction? +

Register the Xrpl MCP server in PolicyLayer and add a rule for approve-transaction: 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 approve-transaction? +

approve-transaction 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 approve-transaction? +

Yes. Add a rate_limit block to the approve-transaction 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 approve-transaction completely? +

Set action: deny in the PolicyLayer policy for approve-transaction. 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 approve-transaction? +

approve-transaction 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 →