Delete/release a phone number from your account.
AI agents call retell_delete_phone_number to permanently remove resources in Retell AI MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Deleting a phone number is a destructive operation that cannot be undone. Once deleted, the phone number is released from the account and cannot be recovered without re-provisioning (which would be a new number). This action has lasting consequences: any incoming calls or messages to that number will no longer reach the account, potentially disrupting business operations or customer communications.
From the tool's definition Tool name explicitly states "delete" and description says "Delete/release a phone number from your account" — this is an irreversible action that removes a resource.
Attacks that exploit this kind of access
Delete/release a phone number from your account. It is categorised as a Destructive tool in the Retell AI MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Retell AI MCP Server MCP server in PolicyLayer and add a rule for retell_delete_phone_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 Retell AI MCP Server. Nothing to install.
retell_delete_phone_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 retell_delete_phone_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 retell_delete_phone_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.
retell_delete_phone_number is provided by the Retell AI MCP Server MCP server (itsanamune/retellsimp). 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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