AI agents call get_labels to retrieve information from Gmail without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves label metadata from Gmail without creating, modifying, or deleting any data. It has no side effects and poses minimal risk even if called repeatedly or with unexpected parameters. The blast radius is limited to potential information disclosure of label names/structures, which is low-severity.
From the tool's definition Tool description states 'Get labels from gmail' - a retrieval operation with no modification or deletion. Sibling tools like 'get_all_emails_ids_by_query' and 'get_email_detail' are similarly read-only operations.
Documented attack patterns abuse exactly the kind of access get_labels gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Gmail, and nothing reaches the server without passing your rules. This is the rule we recommend for get_labels:
{
"version": "1",
"default": "deny",
"tools": {
"get_labels": {}
}
}get_labels is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get labels from gmail. It is categorised as a Read tool in the Gmail MCP Server, which means it retrieves data without modifying state.
Register the Gmail MCP server in PolicyLayer and add a rule for get_labels: 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. Nothing to install.
get_labels 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 get_labels 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 get_labels. 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.
get_labels is provided by the Gmail MCP server (ivanlhz/gmail-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Gmail, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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12 Gmail tools catalogued and risk-classified — across an index of 43,000+ MCP servers.