Cancel/delete a phone number
AI agents call delete_number to permanently remove resources in Seven — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool permanently removes a phone number from the account, which cannot be undone. Deletion of identifiers tied to communication infrastructure qualifies as destructive. The high severity reflects that misuse could disrupt SMS/voice/RCS messaging capabilities and potentially affect business continuity. Confidence is high due to explicit 'delete' terminology and destructive intent.
From the tool's definition Tool name 'delete_number' with description 'Cancel/delete a phone number' explicitly performs an irreversible deletion operation on a phone number resource.
Attacks that exploit this kind of access
Cancel/delete a phone number. It is categorised as a Destructive tool in the Seven MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Seven MCP server in PolicyLayer and add a rule for delete_number: 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 Seven. Nothing to install.
delete_number 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 delete_number 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 delete_number. 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.
delete_number is provided by the Seven MCP server (seven-io/seven-mcp). 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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