Perform bulk actions on messages matching criteria
AI agents call bulk_mail_action 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.
Bulk mail actions can encompass destructive operations (delete, purge) applied to many messages simultaneously, creating a very high blast radius. The term 'bulk' amplifies severity since a misuse could irrecoverably destroy large volumes of email. Even if some actions are merely writes (mark read, move), the most severe applicable category given the potential for mass irreversible deletion is Destructive.
From the tool's definition 'bulk actions on messages matching criteria' — bulk operations on email can include irreversible deletions, purges, or mass modifications across many messages at once
Risk signalsBulk/mass operation — affects multiple targets
Attacks that exploit this kind of access
Perform bulk actions on messages matching criteria. 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 bulk_mail_action: 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.
bulk_mail_action 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 bulk_mail_action 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 bulk_mail_action. 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.
bulk_mail_action 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.
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