List all calendars in the user account
AI agents call list_calendars to retrieve information from Calendar Mcp without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only query operation that retrieves calendar information without creating, modifying, deleting, or executing any actions. It has minimal blast radius if misused by an AI agent, as it only exposes calendar metadata that the authenticated user already has access to. The severity is low because listing calendars does not affect any data or trigger external operations.
From the tool's definition Tool name 'list_calendars' and description 'List all calendars in the user account' indicate a retrieval operation with no modification or deletion of data.
Attacks that exploit this kind of access
List all calendars in the user account. It is categorised as a Read tool in the Calendar Mcp MCP Server, which means it retrieves data without modifying state.
Register the Calendar MCP server in PolicyLayer and add a rule for 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 Calendar Mcp. Nothing to install.
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 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 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.
list_calendars is provided by the Calendar MCP server (ydrogen/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.
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