Delete a knowledge base.
AI agents call retell_delete_knowledge_base 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.
This tool irreversibly removes a knowledge base and its associated data. Deletion cannot be undone without restoration from backups. This is a destructive operation with potentially significant blast radius if triggered incorrectly by an AI agent, as it results in permanent data loss.
From the tool's definition Tool name is 'retell_delete_knowledge_base' and description states 'Delete a knowledge base.' The verb 'delete' explicitly indicates irreversible removal of data.
Attacks that exploit this kind of access
Delete a knowledge base. 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_knowledge_base: 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_knowledge_base 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_knowledge_base 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_knowledge_base. 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_knowledge_base 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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