Cancel an existing order.
AI agents call cancel_order to permanently remove resources in Ib Async — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Cancelling a live trading order in Interactive Brokers is an irreversible action: once cancelled, the order is gone and any market opportunity associated with it is lost. This fits the Destructive category (irreversible removal/termination of an active order).
From the tool's definition Cancel an existing order — cancelling a live brokerage order is irreversible (the order is removed from the market and cannot be un-cancelled).
Attacks that exploit this kind of access
Cancel an existing order. It is categorised as a Destructive tool in the Ib Async MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Ib Async 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 Ib Async. 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 Ib Async MCP server (nadavgb-atom/ib-async-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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