place_order

THE RISK

Critical Risk

Why place_order needs a policy

Placing a trading order directly commits financial obligations by entering the market and potentially moving real money. On a live MT4 account, this action buys or sells financial instruments, creating immediate financial exposure. This is the highest severity financial action possible — an AI agent misusing this tool could execute large or repeated trades causing significant monetary loss.

From the tool's definition place_order — 'Place a trading order in MetaTrader 4'

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 MCP MetaTrader 4 Server, 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 MCP MetaTrader 4 Server — 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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Free to start. No card required.

EXPLORE

Related tools and policies

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All 14 MCP MetaTrader 4 Server tools →

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Go deeper

Critical-risk tools in MCP MetaTrader 4 Server → 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 a trading order in MetaTrader 4. It is categorised as a Financial tool in the MCP MetaTrader 4 Server 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 MCP MetaTrader 4 Server 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 MCP MetaTrader 4 Server. 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 MCP MetaTrader 4 Server MCP server (8nite/metatrader-4-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP MetaTrader 4 Server tool call.

Start from MCP MetaTrader 4 Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →