List the user
AI agents call gmail_calendar_list_calendars to retrieve information from Personal Gmail 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 calendar information without modifying or executing any operations. Listing calendars is a non-destructive read operation with minimal blast radius—it only exposes metadata about available calendars to which the user already has access.
From the tool's definition Tool name contains 'list' and description indicates a retrieval operation ('List the user'). The sibling tools show this server performs read operations like gmail_calendar_list_events and gmail_list_labels.
Attacks that exploit this kind of access
List the user. It is categorised as a Read tool in the Personal Gmail MCP Server, which means it retrieves data without modifying state.
Register the Personal Gmail MCP server in PolicyLayer and add a rule for gmail_calendar_list_calendars: 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 Personal Gmail. Nothing to install.
gmail_calendar_list_calendars 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_calendar_list_calendars 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_calendar_list_calendars. 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_calendar_list_calendars is provided by the Personal Gmail MCP server (jaingxyz/personal-gmail-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.
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