Deletes an existing appointment from Cal.com calendar.
AI agents call calcom_delete_appointment to permanently remove resources in Cal Com Calendar MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Deletion of calendar appointments is an irreversible action that cannot be undone through the tool itself. Once deleted, the appointment data is lost unless restored from backups outside the tool's scope. While the blast radius is limited to calendar data (not financial or system-wide), the destructive nature of permanent data removal justifies the Destructive category, which is more severe than Execute or Write.
From the tool's definition Tool name: 'calcom_delete_appointment'. Description states it 'Deletes an existing appointment from Cal.com calendar.' The verb 'deletes' indicates irreversible removal of data.
Attacks that exploit this kind of access
Deletes an existing appointment from Cal.com calendar. It is categorised as a Destructive tool in the Cal Com Calendar MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Cal Com Calendar MCP Server MCP server in PolicyLayer and add a rule for calcom_delete_appointment: 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 Cal Com Calendar MCP Server. Nothing to install.
calcom_delete_appointment 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 calcom_delete_appointment 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 calcom_delete_appointment. 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.
calcom_delete_appointment is provided by the Cal Com Calendar MCP Server MCP server (mumunha/cal_dot_com_mcpserver). 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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