AI agents call cancel_order to permanently remove resources in QMT-MCP-Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Cancelling a trading order is an irreversible action — once cancelled, the order cannot be reinstated. In a financial trading context, this can have significant consequences (missed trades, market impact). While it does not move money directly, it destroys an existing order record/action.
From the tool's definition Tool name 'cancel_order' and description '取消订单' (cancel order) indicate irreversible cancellation of a stock trading order.
Documented attack patterns abuse exactly the kind of access cancel_order gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and QMT-MCP-Server, and nothing reaches the server without passing your rules. This is the rule we recommend for cancel_order:
{
"version": "1",
"default": "deny",
"hide": [
"cancel_order"
]
}cancel_order disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.
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取消订单. It is categorised as a Destructive tool in the QMT-MCP-Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the QMT-MCP-Server MCP server in PolicyLayer and add a rule for cancel_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 QMT-MCP-Server. Nothing to install.
cancel_order 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 cancel_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 cancel_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.
cancel_order is provided by the QMT-MCP-Server MCP server (nnquant/qmt-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 4 QMT-MCP-Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4 QMT-MCP-Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.