Remove calendar sharing.
AI agents call delete_acl_rule to permanently remove resources in Gcalendar — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Deleting ACL rules removes sharing permissions from a calendar, which is an irreversible action that cannot be undone without recreating the rule. This falls under Destructive (irreversibly modifies access/permissions) rather than Write (reversible modifications).
From the tool's definition Tool name is 'delete_acl_rule' and description states 'Remove calendar sharing.' The term 'delete' combined with 'acl_rule' (Access Control List rule) indicates irreversible removal of permissions.
Attacks that exploit this kind of access
Remove calendar sharing. It is categorised as a Destructive tool in the Gcalendar MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Gcalendar MCP server in PolicyLayer and add a rule for delete_acl_rule: 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 Gcalendar. Nothing to install.
delete_acl_rule 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_acl_rule 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_acl_rule. 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_acl_rule is provided by the Gcalendar MCP server (sandeepmallareddy/gcalendar-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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