AI agents call pm_cancel_order to permanently remove resources in Waiaas — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Although this tool does not move funds directly, cancelling an active order is a destructive operation that permanently modifies the state of a financial position. The user's intent to keep that order active is reversed, and recovery requires manual re-submission. This is more severe than Write (which covers reversible modifications) because the original order state is gone.
From the tool's definition 'Cancel an active Polymarket CLOB order' — this operation irreversibly cancels an existing financial order, removing it from the order book and preventing its execution. The action cannot be undone without creating a new order.
Documented attack patterns abuse exactly the kind of access pm_cancel_order gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Waiaas, and nothing reaches the server without passing your rules. This is the rule we recommend for pm_cancel_order:
{
"version": "1",
"default": "deny",
"hide": [
"pm_cancel_order"
]
}pm_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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Cancel an active Polymarket CLOB order by ID. It is categorised as a Destructive tool in the Waiaas MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Waiaas 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 Waiaas. 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 Waiaas MCP server (minhoyoo-iotrust/waiaas). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Waiaas, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
126 Waiaas tools catalogued and risk-classified — across an index of 43,000+ MCP servers.