Cancel a specific order by its ID.
AI agents call cancel_order_by_id to permanently remove resources in Alpaca MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Cancelling an order is an irreversible action that terminates a pending financial transaction. Once cancelled, the order cannot be restored. Given the financial trading context (Alpaca trading infrastructure), this has high blast radius as it could disrupt trading strategies or cause financial harm if misused.
From the tool's definition Cancel a specific order by its ID
Attacks that exploit this kind of access
Cancel a specific order by its ID. It is categorised as a Destructive tool in the Alpaca MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Alpaca MCP Server MCP server in PolicyLayer and add a rule for cancel_order_by_id: 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 Alpaca MCP Server. Nothing to install.
cancel_order_by_id 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_by_id 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_by_id. 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_by_id is provided by the Alpaca MCP Server MCP server (jbkix06/alpaca_mcp_server). 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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