createXrpTrustline

THE RISK

Critical Risk

Creating a trustline on XRP Ledger is a financial operation that establishes a commitment to hold and transact a specific token, effectively enabling financial exposure to that asset. It involves signing and submitting a transaction to the blockchain using a private key, which commits financial obligations.

From the tool's definition Create a trustline for a token on the XRP Ledger using private key from .env

Documented attack patterns abuse exactly the kind of access createXrpTrustline gives an agent:

HOW TO CONTROL CREATEXRPTRUSTLINE

PolicyLayer is an MCP gateway — it sits between your AI agents and Web3 MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for createXrpTrustline:

policy.json

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

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

Create a free account and register Web3 MCP Server — 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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All 55 Web3 MCP Server tools →

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Go deeper

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All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
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FAQ

What does the createXrpTrustline tool do? +

Create a trustline for a token on the XRP Ledger using private key from .env. It is categorised as a Financial tool in the Web3 MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on createXrpTrustline? +

Register the Web3 MCP Server MCP server in PolicyLayer and add a rule for createXrpTrustline: 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 Web3 MCP Server. Nothing to install.

What risk level is createXrpTrustline? +

createXrpTrustline 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 createXrpTrustline? +

Yes. Add a rate_limit block to the createXrpTrustline 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 createXrpTrustline completely? +

Set action: deny in the PolicyLayer policy for createXrpTrustline. 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 createXrpTrustline? +

createXrpTrustline is provided by the Web3 MCP Server MCP server (strangelove-ventures/web3-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Web3 MCP Server tool call.

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// WHAT CREATEXRPTRUSTLINE ON WEB3 MCP SERVER DOES

// THE RISK

// HOW TO CONTROL CREATEXRPTRUSTLINE

// EXPLORE