Delete a Microsoft calendar event by id.
AI agents call microsoft_delete_calendar_event to permanently remove resources in Personal Mail — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Deletion of calendar events cannot be undone and represents permanent data loss. While not financial in nature, the destructive category is appropriate given the irreversible nature of the operation. Severity is high because unintended calendar deletions could disrupt schedules, miss meetings, or cause organizational confusion, though the blast radius is narrower than financial or critical infrastructure impacts.
From the tool's definition Tool name explicitly states 'delete' and description confirms 'Delete a Microsoft calendar event by id' — this irreversibly removes calendar data.
Attacks that exploit this kind of access
Delete a Microsoft calendar event by id. It is categorised as a Destructive tool in the Personal Mail MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Personal Mail MCP server in PolicyLayer and add a rule for microsoft_delete_calendar_event: 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 Personal Mail. Nothing to install.
microsoft_delete_calendar_event 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 microsoft_delete_calendar_event 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 microsoft_delete_calendar_event. 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.
microsoft_delete_calendar_event is provided by the Personal Mail MCP server (srogerf/personal-mail-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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