Delete a calendar event
AI agents call delete-calendar-event to permanently remove resources in Outlook OAuth MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool permanently removes calendar event data from the user's Outlook calendar. Deletion is irreversible and represents data loss. Although the scope is limited to individual calendar events (not system-wide destruction), the high confidence in permanent data loss and the potential for disruption to user schedules and commitments justifies 'Destructive' classification with high severity.
From the tool's definition Tool name 'delete-calendar-event' and description 'Delete a calendar event' indicate irreversible removal of calendar data. The action cannot be undone without external recovery mechanisms.
Attacks that exploit this kind of access
Delete a calendar event. It is categorised as a Destructive tool in the Outlook OAuth MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Outlook OAuth MCP Server MCP server in PolicyLayer and add a rule for 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 Outlook OAuth MCP Server. Nothing to install.
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 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 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.
delete-calendar-event is provided by the Outlook OAuth MCP Server MCP server (leonine-studios/useful-outlook-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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