AI agents call escrow-cancel to permanently remove resources in Xrpl mcp — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Cancelling an escrow is an irreversible operation that destroys a ledger state. While it does not delete data in the traditional sense, it terminates a financial arrangement that cannot be restored without creating a new escrow. This qualifies as Destructive rather than Execute because the action's primary effect is to irreversibly cancel a financial commitment.
From the tool's definition Tool name 'escrow-cancel' and description 'Cancel an unexecuted Escrow on the XRP Ledger' indicate irreversible cancellation of a ledger object. This action cannot be undone and permanently removes an escrow arrangement.
Documented attack patterns abuse exactly the kind of access escrow-cancel 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 escrow-cancel:
{
"version": "1",
"default": "deny",
"hide": [
"escrow-cancel"
]
}escrow-cancel disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.
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Cancel an unexecuted Escrow on the XRP Ledger. It is categorised as a Destructive tool in the Xrpl mcp MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Xrpl MCP server in PolicyLayer and add a rule for escrow-cancel: 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.
escrow-cancel is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the escrow-cancel 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 escrow-cancel. 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.
escrow-cancel 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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