Place a market order with an explicit volume (lots). Use this only when you already know the lot size; for risk-based sizing use place_risk_order.
AI agents use place_market_order to commit financial operations through MetaTrader 5 MCP — usually the final step of a payment, billing, or trading workflow. A call moves real money.
This tool directly executes live trades on MetaTrader 5, committing real financial capital by placing market orders. Misuse could result in significant financial losses with no ability to reverse the executed trade at the filled price. This is clearly a Financial category tool with critical severity given the direct monetary impact.
From the tool's definition Place a market order with an explicit volume (lots)
Attacks that exploit this kind of access
Place a market order with an explicit volume (lots). Use this only when you already know the lot size; for risk-based sizing use place_risk_order. It is categorised as a Financial tool in the MetaTrader 5 MCP MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the MetaTrader 5 MCP server in PolicyLayer and add a rule for place_market_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 MetaTrader 5 MCP. Nothing to install.
place_market_order is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the place_market_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.
Set action: deny in the PolicyLayer policy for place_market_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.
place_market_order is provided by the MetaTrader 5 MCP server (rpieterse/mcp-studio-mt5-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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