AI agents call cancel_all_orders 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.
An AI agent that decides to call cancel_all_orders doesn't hesitate, doesn't double-check, and doesn't stop at one. Whatever it removes from Alpaca MCP Server is gone — there is no undo for destructive operations.
Documented attack patterns abuse exactly the kind of access cancel_all_orders gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Alpaca MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for cancel_all_orders:
{
"version": "1",
"default": "deny",
"hide": [
"cancel_all_orders"
]
}cancel_all_orders 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 all open orders. 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_all_orders: 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_all_orders 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_all_orders 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_all_orders. 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_all_orders is provided by the Alpaca MCP Server MCP server (tedlikeskix/alpaca-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 9 Alpaca MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
9 Alpaca MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.