Revoke tokens with Google and delete local tokens, then get new auth URL.
AI agents call revoke_auth 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.
This tool irreversibly revokes OAuth tokens with Google and deletes local token storage. Revoking tokens terminates the authenticated session and cannot be undone — new authorization must be obtained. Misuse would immediately disconnect the AI agent's access to Google Calendar, disrupting all calendar management capabilities and requiring re-authentication.
From the tool's definition Revoke tokens with Google and delete local tokens
Attacks that exploit this kind of access
Revoke tokens with Google and delete local tokens, then get new auth URL. 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 revoke_auth: 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.
revoke_auth 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 revoke_auth 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 revoke_auth. 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.
revoke_auth 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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