reject-transaction

THE RISK

Critical Risk

Why reject-transaction needs a policy

Rejecting a pending transaction is an irreversible action that permanently prevents the transaction from being processed. Unlike a cancellation that might allow retry, rejection definitively blocks the transaction from being signed or submitted, making it a destructive/irreversible operation.

From the tool's definition Reject a pending transaction, preventing it from being signed or submitted.

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

POLICY

How to control reject-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 reject-transaction:

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "reject-transaction"
  ]
}

reject-transaction disappears from the agent's tool list entirely, and any attempt to call it is denied. 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.

RESTRICT THIS TOOL →

Free to start. No card required.

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.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about reject-transaction

What does the reject-transaction tool do? +

Reject a pending transaction, preventing it from being signed or submitted. 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.

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

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

reject-transaction is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit reject-transaction? +

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

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

reject-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 →