List all available calendars with their names and UIDs
AI agents call list_calendars to retrieve information from Apple 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 only queries and returns calendar metadata (names and UIDs) without creating, modifying, deleting, or executing any operations. It is a pure data retrieval function with no side effects, fitting the Read category. The blast radius is minimal—an attacker gains only metadata visibility into calendars, not the ability to modify, access event details, or execute external operations.
From the tool's definition Tool name 'list_calendars' and description 'List all available calendars with their names and UIDs' indicate a retrieval operation with no modification or deletion of data.
Attacks that exploit this kind of access
List all available calendars with their names and UIDs. It is categorised as a Read tool in the Apple Calendar MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Apple Calendar MCP Server 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 Apple Calendar MCP Server. 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 Apple Calendar MCP Server MCP server (null-phnix/apple-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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