place_order

THE RISK

Critical Risk

Why place_order needs a policy

The tool name 'place_order' in the context of a trading platform strongly implies it submits financial orders (buy/sell trades), which constitutes a financial commitment. The server description explicitly mentions executing trades. Misuse could result in unintended financial transactions, making this critical severity.

From the tool's definition Tool name 'place_order' on a server described as enabling agents to 'execute trades via the Moomoo platform', alongside sibling tools like 'cancel_order', 'get_deals', and 'get_accounts'

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

POLICY

How to control place_order

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

policy.json

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

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

Create a free account and register Moomoo Api — 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

More Moomoo Api tools

Destructive cancel_order cancel_order Execute unlock_trade unlock_trade Write modify_order modify_order Read check_health Check connectivity to Moomoo and MCP server health. Read get_account_summary get_account_summary Read get_accounts get_accounts Read get_assets get_assets Read get_cash_flow get_cash_flow

All 22 Moomoo Api tools →

Financial tools on other servers

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Go deeper

Critical-risk tools in Moomoo Api → Every critical-risk tool this server exposes, in one view.
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.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
How to Add Spending Controls to Any MCP Agent →
Rate Limiting MCP Tool Calls: A Practical Guide →

FAQ

Questions about place_order

What does the place_order tool do? +

place_order. It is categorised as a Financial tool in the Moomoo Api MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on place_order? +

Register the Moomoo Api MCP server in PolicyLayer and add a rule for place_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 Moomoo Api. Nothing to install.

What risk level is place_order? +

place_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 place_order? +

Yes. Add a rate_limit block to the place_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 place_order completely? +

Set action: deny in the PolicyLayer policy for place_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 place_order? +

place_order is provided by the Moomoo Api MCP server (litash/moomoo-api-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Moomoo Api tool call.

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

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