List all Apple Calendar calendars accessible to the host process. Returns a JSON array of
AI agents call ical__list_calendars to retrieve information from Mcp Ical Swift without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and enumerates calendar metadata without creating, modifying, deleting, or executing any operations. It is a passive read-only query. While it does expose calendar information, the low severity reflects that listing calendars alone poses minimal risk—no side effects occur and the information disclosed would typically be visible to the user running the host process.
From the tool's definition Tool name 'ical__list_calendars' and description 'List all Apple Calendar calendars accessible to the host process. Returns a JSON array' indicates a query/retrieval operation with no data modification or side effects.
Attacks that exploit this kind of access
List all Apple Calendar calendars accessible to the host process. Returns a JSON array of. It is categorised as a Read tool in the Mcp Ical Swift MCP Server, which means it retrieves data without modifying state.
Register the Mcp Ical Swift MCP server in PolicyLayer and add a rule for ical__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 Mcp Ical Swift. Nothing to install.
ical__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 ical__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 ical__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.
ical__list_calendars is provided by the Mcp Ical Swift MCP server (sealjay/mcp-ical-swift). 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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