set-default-wallet

THE RISK

Medium Risk

Why set-default-wallet needs a policy

This tool modifies persistent configuration (the default wallet setting) that determines which wallet will be used for future transactions. While not destructive (the change is reversible), it is a Write operation because it modifies application state.

From the tool's definition Tool name 'set-default-wallet' and description 'Set the default wallet used for transactions when no wallet name is specified' indicate modification of configuration state that affects subsequent transaction behavior.

Documented attack patterns abuse exactly the kind of access set-default-wallet gives an agent:

POLICY

How to control set-default-wallet

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-default-wallet:

policy.json

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

set-default-wallet 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.

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.

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EXPLORE

Related tools and policies

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about set-default-wallet

What does the set-default-wallet tool do? +

Set the default wallet used for transactions when no wallet name is specified. 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-default-wallet? +

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

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

Can I rate-limit set-default-wallet? +

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

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

set-default-wallet 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.

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