Cancel an event (requires approval).
AI agents call calendar_cancel_event to permanently remove resources in AIOS Co-Founder MCP — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Canceling a calendar event removes or modifies an existing commitment irreversibly. While approval is required (reducing immediate risk), the underlying action destroys/overwrites existing calendar state without the ability to undo via the tool itself. This fits the Destructive category—irreversible removal of data—rather than Write (reversible modification).
From the tool's definition Tool name 'calendar_cancel_event' and description 'Cancel an event (requires approval)' indicates irreversible deletion/cancellation of calendar data. The approval gating mitigates risk but does not change the destructive nature of the operation.
Attacks that exploit this kind of access
Cancel an event (requires approval). It is categorised as a Destructive tool in the AIOS Co-Founder MCP MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the AIOS Co-Founder MCP server in PolicyLayer and add a rule for 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 AIOS Co-Founder MCP. Nothing to install.
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 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 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.
calendar_cancel_event is provided by the AIOS Co-Founder MCP server (varun-b-nagaraj/python-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
calendar_cancel_event is one line of AIOS Co-Founder's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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