Delete an event. If you organize it and sendUpdates=all (default), attendees receive a cancellation. Use sendUpdates=none for solo events.
AI agents call gmail_calendar_cancel_event to permanently remove resources in Personal Gmail — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool permanently deletes calendar events, which cannot be undone. Even though it notifies attendees of the cancellation, the action itself is irreversible and removes data from the calendar. The destructive nature takes precedence over the Write category, as deletion is not reversible.
From the tool's definition Tool description explicitly states 'Delete an event' and clarifies behavior around cancellation notifications to attendees, indicating irreversible removal of calendar data.
Attacks that exploit this kind of access
Delete an event. If you organize it and sendUpdates=all (default), attendees receive a cancellation. Use sendUpdates=none for solo events. It is categorised as a Destructive tool in the Personal Gmail MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Personal Gmail MCP server in PolicyLayer and add a rule for gmail_calendar_cancel_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 Gmail. Nothing to install.
gmail_calendar_cancel_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 gmail_calendar_cancel_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 gmail_calendar_cancel_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.
gmail_calendar_cancel_event is provided by the Personal Gmail MCP server (jaingxyz/personal-gmail-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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