oracle-set

THE RISK

Medium Risk

Why oracle-set needs a policy

The tool modifies oracle data on the XRP Ledger, which is a reversible write operation. While it doesn't delete data (which would be Destructive) or move funds (Financial), it does alter state that other applications may depend on. Oracle data affects price feeds used by other contracts and applications, so misuse could cause significant downstream harm through corrupted price information.

From the tool's definition Set or update Oracle data on the XRP Ledger — the verb 'set or update' indicates modification of ledger state. This is a write operation that creates or modifies data on a blockchain.

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

POLICY

How to control oracle-set

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 oracle-set:

policy.json

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

oracle-set 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.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Xrpl mcp tools

Financial amm-deposit Deposit assets into an existing Automated Market Maker (AMM) on the XRP Ledger Financial transfer-token Transfer tokens between addresses Financial transfer-xrp Transfer XRP between accounts using the connected wallet or a named wallet Financial check-cash Cash a Check to receive funds from it Financial amm-bid Place a bid on an Automated Market Maker Financial amm-clawback Clawback assets from an Automated Market Maker (AMM) Financial amm-create Create a new Automated Market Maker (AMM) on the XRP Ledger Financial approve-transaction Approve a pending transaction, signing and submitting it to the XRP Ledger. This is a dest

All 71 Xrpl mcp tools →

Write tools on other servers

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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 oracle-set

What does the oracle-set tool do? +

Set or update Oracle data on the XRP Ledger (Requires Price Oracle amendment). 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 oracle-set? +

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

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

Can I rate-limit oracle-set? +

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

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

oracle-set 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 →