Remove an account and revoke its credentials
AI agents call auth_revoke to permanently remove resources in Mail Cal Drive — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool performs an irreversible action that destroys account access and credentials. Once revoked, the account must be re-authenticated from scratch, making this a Destructive action rather than merely a Write operation. The blast radius is high as revoking credentials could block legitimate access to email, calendar, and cloud storage services, and the action cannot be automatically recovered.
From the tool's definition The tool description states 'Remove an account and revoke its credentials' - this irreversibly terminates access and removes stored authentication, which cannot be easily undone without re-authentication setup.
Attacks that exploit this kind of access
Remove an account and revoke its credentials. It is categorised as a Destructive tool in the Mail Cal Drive MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Mail Cal Drive MCP server in PolicyLayer and add a rule for auth_revoke: 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 Mail Cal Drive. Nothing to install.
auth_revoke 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 auth_revoke 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 auth_revoke. 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.
auth_revoke is provided by the Mail Cal Drive MCP server (rumbitopi/mail-cal-drive-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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