Create or modify a trust line on the XRP Ledger, allowing you to hold non-XRP assets
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.
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
Documented attack patterns abuse exactly the kind of access set-trustline 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 set-trustline:
{
"version": "1",
"default": "deny",
"tools": {
"set-trustline": {
"limits": [
{
"counter": "set-trustline_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}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.
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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.
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.
set-trustline is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
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.
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.
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.
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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