Return available calendar containers with their name and URL.
AI agents call list_calendars to retrieve information from iCloud CalDAV MCP Connector 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 metadata about calendars (names and URLs) without creating, modifying, or deleting any data. It is a straightforward information retrieval operation analogous to a list or fetch operation. The low severity reflects that exposure of calendar metadata poses minimal risk even if misused by an untrusted agent, as it does not enable data modification, destruction, or financial transactions.
From the tool's definition Tool name 'list_calendars' and description 'Return available calendar containers with their name and URL' indicate a retrieval operation with no data modification or side effects.
Attacks that exploit this kind of access
Return available calendar containers with their name and URL. It is categorised as a Read tool in the iCloud CalDAV MCP Connector MCP Server, which means it retrieves data without modifying state.
Register the iCloud CalDAV MCP Connector 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 iCloud CalDAV MCP Connector. 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 iCloud CalDAV MCP Connector MCP server (localhost433/icloud-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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