AI agents call delete-filter to permanently remove resources in Enhanced Gmail MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Deleting a filter is an irreversible action that removes user-configured email rules permanently. While not as critical as deleting emails themselves, it destroys configuration data that cannot be easily recovered and can disrupt the user's email organization workflow.
From the tool's definition Tool name: 'delete-filter' with description 'Deletes a specific filter'. The verb 'deletes' indicates irreversible removal of a configured Gmail filter.
Documented attack patterns abuse exactly the kind of access delete-filter gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Enhanced Gmail MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for delete-filter:
{
"version": "1",
"default": "deny",
"hide": [
"delete-filter"
]
}delete-filter 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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Deletes a specific filter. It is categorised as a Destructive tool in the Enhanced Gmail MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Enhanced Gmail MCP Server MCP server in PolicyLayer and add a rule for delete-filter: 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 Enhanced Gmail MCP Server. Nothing to install.
delete-filter 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-filter 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-filter. 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-filter is provided by the Enhanced Gmail MCP Server MCP server (theposch/gmail-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Enhanced Gmail MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
27 Enhanced Gmail MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.