List all authenticated Google Calendar accounts that the user has connected to this server. Shows which account is set as default.
AI agents call list_calendar_accounts to retrieve information from Google Calendar 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 returns information about authenticated accounts without creating, modifying, or deleting any data. However, severity is elevated to medium rather than low because the information disclosed (list of authenticated accounts and default account designation) could be sensitive personal/organizational data that reveals which accounts are connected, potentially useful for social engineering or…
From the tool's definition Tool description states it 'List[s] all authenticated Google Calendar accounts' - a retrieval operation with no modification. The verb 'list' is a classic Read operation.
Attacks that exploit this kind of access
List all authenticated Google Calendar accounts that the user has connected to this server. Shows which account is set as default. It is categorised as a Read tool in the Google Calendar MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Google Calendar MCP Server MCP server in PolicyLayer and add a rule for list_calendar_accounts: 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 Calendar MCP Server. Nothing to install.
list_calendar_accounts 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 list_calendar_accounts 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 list_calendar_accounts. 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.
list_calendar_accounts is provided by the Google Calendar MCP Server MCP server (thisnick/google-calendar-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 →