Cancel an order and request a refund. Only works if no SMS has been received yet. Use this if the service is taking too long or you want to try a different number. Cooldown: cancel is only available 120 seconds after purchase. Check cancel_available_at on the order before calling. Calling earlier...
Part of the Sms server.
Free to start. No card required.
AI agents may call virtualsms_cancel_order to permanently remove or destroy resources in Sms. Without a policy, an autonomous agent could delete critical data in a loop with no way to undo the damage. PolicyLayer blocks destructive tools by default and requires explicit human approval before enabling them.
Without a policy, an AI agent could call virtualsms_cancel_order in a loop, permanently destroying resources in Sms. There is no undo for destructive operations. PolicyLayer blocks this tool by default and only allows it when a human explicitly approves the action.
Destructive tools permanently remove data. Block by default. Only enable with explicit approval workflows.
{
"version": "1",
"default": "deny",
"hide": [
"virtualsms_cancel_order"
]
}See the full Sms policy for all 18 tools.
These attack patterns abuse exactly the kind of access virtualsms_cancel_order gives an agent. Each links to the full case and the policy that stops it:
Other destructive tools across the catalogue. The same approach applies to each: deny by default, or require human approval.
Cancel an order and request a refund. Only works if no SMS has been received yet. Use this if the service is taking too long or you want to try a different number. Cooldown: cancel is only available 120 seconds after purchase. Check cancel_available_at on the order before calling. Calling earlier returns a cooldown_active error from this MCP server (no backend round-trip).. It is categorised as a Destructive tool in the Sms MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Sms MCP server in PolicyLayer and add a rule for virtualsms_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 Sms. Nothing to install.
virtualsms_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 virtualsms_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 virtualsms_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.
virtualsms_cancel_order is provided by the Sms MCP server (virtualsms-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 18 Sms tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.