Cancel private market order.
AI agents call pm_cancel_order to permanently remove resources in Basis MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Cancelling a market order permanently removes it from the order book. While it does not delete data in the traditional sense, it irreversibly terminates a financial commitment/intent. In the context of a trading/financial protocol, this is closest to Destructive (irreversible removal of an order). It does not directly move money, but it does irrevocably alter the state of a financial instrument.
From the tool's definition 'Cancel private market order' — cancelling an order is an irreversible action that removes a standing financial order from the private market, which cannot be undone once executed.
Attacks that exploit this kind of access
Cancel private market order. It is categorised as a Destructive tool in the Basis MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Basis MCP Server MCP server in PolicyLayer and add a rule for pm_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 Basis MCP Server. Nothing to install.
pm_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 pm_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 pm_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.
pm_cancel_order is provided by the Basis MCP Server MCP server (launch-on-basis/mcp-ts). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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