get_all_emails_ids_by_query

THE RISK

Low Risk

Why get_all_emails_ids_by_query needs a policy

This tool retrieves email identifiers matching a query pattern, which is a read-only operation with no side effects. However, severity is elevated to medium because returning all matching email IDs could expose large volumes of sensitive email metadata to an AI agent, which could be misused to identify and target specific messages.

From the tool's definition Tool name 'get_all_emails_ids_by_query' indicates it retrieves email IDs based on a query. Server description states the MCP server enables 'reading, labeling, and searching emails.' The function signature implies a search/query operation with no modification…

Documented attack patterns abuse exactly the kind of access get_all_emails_ids_by_query gives an agent:

POLICY

How to control get_all_emails_ids_by_query

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_all_emails_ids_by_query:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_all_emails_ids_by_query": {}
  }
}

get_all_emails_ids_by_query is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Gmail — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
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FAQ

Questions about get_all_emails_ids_by_query

What does the get_all_emails_ids_by_query tool do? +

get_all_emails_ids_by_query. It is categorised as a Read tool in the Gmail MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_all_emails_ids_by_query? +

Register the Gmail MCP server in PolicyLayer and add a rule for get_all_emails_ids_by_query: 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.

What risk level is get_all_emails_ids_by_query? +

get_all_emails_ids_by_query is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_all_emails_ids_by_query? +

Yes. Add a rate_limit block to the get_all_emails_ids_by_query 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.

How do I block get_all_emails_ids_by_query completely? +

Set action: deny in the PolicyLayer policy for get_all_emails_ids_by_query. 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.

What MCP server provides get_all_emails_ids_by_query? +

get_all_emails_ids_by_query 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.

Enforce policy on every Gmail tool call.

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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