Delete a mail filter. This is irreversible. Requires TREKMAIL_ALLOW_DESTRUCTIVE=true.
AI agents call delete_mail_rule to permanently remove resources in TrekMail MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
The tool permanently removes a mail filter configuration without ability to undo the action. This is irreversible data loss, meeting the definition of Destructive category. The high severity reflects that deleting mail rules could disrupt email filtering for users or organizations, though the blast radius is somewhat contained compared to destructive operations affecting user data directly.
From the tool's definition Tool name contains 'delete'. Description explicitly states 'This is irreversible.' and requires a destructive operation flag (TREKMAIL_ALLOW_DESTRUCTIVE=true) to execute.
Attacks that exploit this kind of access
Delete a mail filter. This is irreversible. Requires TREKMAIL_ALLOW_DESTRUCTIVE=true. It is categorised as a Destructive tool in the TrekMail MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the TrekMail MCP Server MCP server in PolicyLayer and add a rule for delete_mail_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 TrekMail MCP Server. Nothing to install.
delete_mail_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_mail_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_mail_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_mail_rule is provided by the TrekMail MCP Server MCP server (trekmail/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
delete_mail_rule is one line of TrekMail MCP Server's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
Teams ship this data inside their own products. See what a licence covers →