AI agents call gmail_list_emails_with_advanced_filters to retrieve information from Mcp Gmail without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool lists/retrieves email data based on filter criteria with no indication of modification, deletion, or execution capabilities. This is a Read operation. Severity is medium rather than low because email access can expose sensitive information (credentials, private communications, financial data), and an AI agent with unrestricted access could exfiltrate large volumes of email data.
From the tool's definition Tool name contains 'list_emails' which is a retrieval operation. The 'advanced_filters' suffix indicates query filtering without modification capability.
Attacks that exploit this kind of access
gmail_list_emails_with_advanced_filters. It is categorised as a Read tool in the Mcp Gmail MCP Server, which means it retrieves data without modifying state.
Register the Mcp Gmail MCP server in PolicyLayer and add a rule for gmail_list_emails_with_advanced_filters: 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 Mcp Gmail. Nothing to install.
gmail_list_emails_with_advanced_filters 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 gmail_list_emails_with_advanced_filters 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 gmail_list_emails_with_advanced_filters. 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.
gmail_list_emails_with_advanced_filters is provided by the Mcp Gmail MCP server (@monsoft/mcp-gmail). 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.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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