limit_order

THE RISK

Critical Risk

Why limit_order needs a policy

This tool places a financial order on a decentralized exchange (DEX), committing to a trade at a specified price. It directly involves financial transactions and trading obligations on the XRPL DEX. Misuse could result in unintended trades, financial loss, or unauthorized commitment of crypto assets.

From the tool's definition Place a limit order on the XRPL DEX orderbook with expiration

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

POLICY

How to control limit_order

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

policy.json

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

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

Create a free account and register Waiaas — 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 critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Human-in-the-loop → When a tool call should wait for a person — and when policy can decide alone.
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FAQ

Questions about limit_order

What does the limit_order tool do? +

Place a limit order on the XRPL DEX orderbook with expiration. It is categorised as a Financial tool in the Waiaas MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on limit_order? +

Register the Waiaas MCP server in PolicyLayer and add a rule for limit_order: 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 Waiaas. Nothing to install.

What risk level is limit_order? +

limit_order 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 limit_order? +

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

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

limit_order is provided by the Waiaas MCP server (minhoyoo-iotrust/waiaas). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Waiaas tool call.

Start from Waiaas, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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