set-trustline

Create or modify a trust line on the XRP Ledger, allowing you to hold non-XRP assets

SERVERXrpl mcp SOURCEromthpt/mcp-xrpl

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/romthpt-mcp-xrpl/set-trustline.md

WHAT IT DOES

What set-trustline does on Xrpl mcp

AI agents use set-trustline to create or update resources in Xrpl mcp, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Xrpl mcp environment.

RISK

Why set-trustline is rated Medium

This tool creates or modifies trust lines, which are reversible ledger modifications that enable holding non-XRP assets. It is a Write operation as it modifies data without destroying it. Severity is high because misuse could allow an AI to establish unwanted trust relationships with malicious tokens or expose accounts to financial risk through unintended asset exposure, though the action itself is reversible.

From the tool's definition Tool description states 'Create or modify a trust line on the XRP Ledger' — directly modifying ledger state to establish asset holdings

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs set-trustline safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Xrpl mcp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For set-trustline, this is the rule to start with:

set-trustline Rate-limited

set-trustline 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.

View as policy code

policy.json

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

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Xrpl mcp, apply this rule, and every set-trustline call is checked against it from then on.

FAQ

Questions about set-trustline

What does the set-trustline tool do? +

Create or modify a trust line on the XRP Ledger, allowing you to hold non-XRP assets. 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 set-trustline? +

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

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

Can I rate-limit set-trustline? +

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

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

set-trustline 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.

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