Get multiple Gmail messages in a single request (max 25).
AI agents call getGmailMessagesBatch 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 retrieves email messages from Gmail without altering, deleting, or sending them. It is a read-only operation that fetches existing data. The batch retrieval capability does not increase severity; it simply allows efficient querying. Maximum blast radius would be exposure of email contents the user has access to, which is a confidentiality concern but not destructive, financial, or executable in nature.
From the tool's definition Tool retrieves multiple Gmail messages (max 25) in a single request. The description indicates querying/fetching email data with no modification capability (no send, delete, or modify operations mentioned).
Documented attack patterns abuse exactly the kind of access getGmailMessagesBatch 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 getGmailMessagesBatch:
{
"version": "1",
"default": "deny",
"tools": {
"getGmailMessagesBatch": {}
}
}getGmailMessagesBatch is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get multiple Gmail messages in a single request (max 25). 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 getGmailMessagesBatch: 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.
getGmailMessagesBatch 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 getGmailMessagesBatch 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 getGmailMessagesBatch. 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.
getGmailMessagesBatch 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.