List all Gmail filters (rules that automatically process incoming messages based on criteria).
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 performs a read-only operation that retrieves and displays Gmail filter rules. It does not create, modify, delete, execute actions, or trigger external operations. The blast radius of misuse is minimal—an attacker could only learn about existing email filtering rules, which is informational but not immediately harmful. No irreversible changes, code execution, or financial impact possible.
From the tool's definition Tool name 'listGmailFilters' combined with description 'List all Gmail filters' indicates a query operation that retrieves existing filter configuration data without modification or side effects.
Attacks that exploit this kind of access
List all Gmail filters (rules that automatically process incoming messages based on criteria). 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 (pm990320/google-workspace-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
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