List email messages from Gmail inbox or other labels. Returns message IDs and snippets.
AI agents call listGmailMessages 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 queries and retrieves Gmail messages, returning metadata (IDs and snippets) without creating, modifying, deleting, or executing operations. It is a standard read operation with minimal risk, as it only exposes already-accessible message information. The severity is low because misuse would result in unauthorized data exposure but no destructive or financial consequences.
From the tool's definition Tool name 'listGmailMessages' and description 'List email messages from Gmail inbox or other labels. Returns message IDs and snippets.' indicate retrieval of existing data without modification or side effects.
Attacks that exploit this kind of access
List email messages from Gmail inbox or other labels. Returns message IDs and snippets. 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 listGmailMessages: 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.
listGmailMessages 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 listGmailMessages 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 listGmailMessages. 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.
listGmailMessages 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.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
Teams ship this data inside their own products. See what a licence covers →