List all Gmail filters (automatic rules).
AI agents call listGmailFilters to retrieve information from Google Workspace MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves existing Gmail filter configurations without creating, modifying, deleting, or executing any actions. It is a read-only operation that returns data about filter rules. The blast radius is minimal—enumeration of filters poses low risk unless sensitive information about filtering logic is exposed, but the core operation is non-destructive data retrieval.
From the tool's definition Tool name 'listGmailFilters' and description 'List all Gmail filters (automatic rules)' indicate a retrieval operation with no modification or side effects.
Documented attack patterns abuse exactly the kind of access listGmailFilters gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Google Workspace MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for listGmailFilters:
{
"version": "1",
"default": "deny",
"tools": {
"listGmailFilters": {}
}
}listGmailFilters is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all Gmail filters (automatic rules). It is categorised as a Read tool in the Google Workspace MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Google Workspace MCP Server MCP server in PolicyLayer and add a rule for listGmailFilters: 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 Google Workspace MCP Server. Nothing to install.
listGmailFilters is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the listGmailFilters 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 listGmailFilters. 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.
listGmailFilters is provided by the Google Workspace MCP Server MCP server (sputnicyoji/google-workspace-mcp-with-script). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Google Workspace 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.
72 Google Workspace MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.