待機注文を取り消す。
AI agents call mt5_order_cancel to permanently remove resources in MT5 MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Cancelling a pending order is an irreversible action — once cancelled, the order is removed and cannot be automatically reinstated. On a financial trading platform, this can result in missed trades or disrupted trading strategies. While it does not directly move money, it destroys the pending order record irreversibly.
From the tool's definition Tool name 'mt5_order_cancel' and description '待機注文を取り消す' (cancel pending orders) indicate irreversible cancellation of trading orders in MetaTrader 5.
Attacks that exploit this kind of access
待機注文を取り消す。. It is categorised as a Destructive tool in the MT5 MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the MT5 MCP Server MCP server in PolicyLayer and add a rule for mt5_order_cancel: 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 MT5 MCP Server. Nothing to install.
mt5_order_cancel is a Destructive 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 mt5_order_cancel 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 mt5_order_cancel. 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.
mt5_order_cancel is provided by the MT5 MCP Server MCP server (junmt/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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