caldav_list_calendars

THE RISK

Low Risk

Why caldav_list_calendars needs a policy

This tool queries and retrieves calendar metadata without creating, modifying, or deleting any data. It has no destructive or state-changing effects. The severity is low because listing calendars reveals calendar names but does not expose sensitive event content or enable unauthorized modifications. Confidence is high due to clear, unambiguous function semantics.

From the tool's definition Tool name 'caldav_list_calendars' and description 'List all available calendars' indicate a retrieval operation with no side effects. The verb 'list' is explicitly a Read operation.

Documented attack patterns abuse exactly the kind of access caldav_list_calendars gives an agent:

POLICY

How to control caldav_list_calendars

PolicyLayer is an MCP gateway — it sits between your AI agents and CalDAV MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for caldav_list_calendars:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "caldav_list_calendars": {}
  }
}

caldav_list_calendars is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register CalDAV MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More CalDAV MCP Server tools

Destructive caldav_delete_event Delete an event by its UID Write caldav_create_event Create a new event in the calendar Read caldav_get_event_by_uid Get a specific event by its UID Read caldav_get_events Get events from calendar for a specified period Read caldav_get_today_events Get all events for today Read caldav_get_week_events Get all events for the week Read caldav_search_events Search events by text, attendees, or location

All 8 CalDAV MCP Server tools →

Read tools on other servers

M-Team MCP Server get_torrent_detail YouTube MCP Server search_channel Android Forensics ADB MCP Server parse_browser_history 0xarchive web3_challenge

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about caldav_list_calendars

What does the caldav_list_calendars tool do? +

List all available calendars. It is categorised as a Read tool in the CalDAV MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on caldav_list_calendars? +

Register the CalDAV MCP Server MCP server in PolicyLayer and add a rule for caldav_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 CalDAV MCP Server. Nothing to install.

What risk level is caldav_list_calendars? +

caldav_list_calendars is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit caldav_list_calendars? +

Yes. Add a rate_limit block to the caldav_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.

How do I block caldav_list_calendars completely? +

Set action: deny in the PolicyLayer policy for caldav_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.

What MCP server provides caldav_list_calendars? +

caldav_list_calendars is provided by the CalDAV MCP Server MCP server (madbonez/caldav-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every CalDAV MCP Server tool call.

Start from CalDAV MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →