AI agents call delete_label to permanently remove resources in Gmail MCP — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Deleting a label permanently removes it from the Gmail account and cannot be undone. This is a destructive operation that cannot be reversed. While the blast radius is limited to label metadata rather than message content, the irreversible nature of the action and potential for organizational disruption (if an AI agent deletes labels an end-user depends on) elevates this above Write category to Destructive.
From the tool's definition Tool name 'delete_label' combined with description 'Delete a label' indicates irreversible deletion of a Gmail label. The verb 'delete' is explicit and unambiguous.
Documented attack patterns abuse exactly the kind of access delete_label gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Gmail MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for delete_label:
{
"version": "1",
"default": "deny",
"hide": [
"delete_label"
]
}delete_label disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.
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Delete a label. It is categorised as a Destructive tool in the Gmail MCP MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Gmail MCP server in PolicyLayer and add a rule for delete_label: 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 Gmail MCP. Nothing to install.
delete_label 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_label 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_label. 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_label is provided by the Gmail MCP server (shinzo-labs/gmail-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 65 Gmail MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
65 Gmail MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.