calendar.delete_event

THE RISK

Critical Risk

Why calendar.delete_event needs a policy

Deletion of calendar events cannot be undone and represents irreversible data loss. While the blast radius is limited to calendar data (not system-wide or financial), this meets the Destructive category definition.

From the tool's definition Tool name 'calendar.delete_event' with description 'Delete a calendar event.' — uses explicit 'delete' verb indicating irreversible removal of data.

Documented attack patterns abuse exactly the kind of access calendar.delete_event gives an agent:

POLICY

How to control calendar.delete_event

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

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "calendar.delete_event"
  ]
}

calendar.delete_event disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

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

RESTRICT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Nucleus Apple tools

Destructive notes.delete_note Delete a note. Destructive reminders.delete_reminder Delete a reminder. Write notes.save_attachment Export an attachment to a file path. Write calendar.create_event Create a calendar event. Write calendar.update_event Update an existing calendar event. Write notes.add_attachment Add attachment(s) to a note from local file paths. Write notes.create_note Create a new note. Write notes.update_note Update an existing note.

All 30 Nucleus Apple tools →

Destructive tools on other servers

Android Forensics ADB MCP Server create_full_backup 0xarchive web3_revoke_key Frida Game Hacking MCP clear_scan cPanel MCP Server clear_spam_box

Go deeper

Critical-risk tools in Nucleus Apple → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about calendar.delete_event

What does the calendar.delete_event tool do? +

Delete a calendar event. It is categorised as a Destructive tool in the Nucleus Apple MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on calendar.delete_event? +

Register the Nucleus Apple MCP server in PolicyLayer and add a rule for calendar.delete_event: 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 Nucleus Apple. Nothing to install.

What risk level is calendar.delete_event? +

calendar.delete_event is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit calendar.delete_event? +

Yes. Add a rate_limit block to the calendar.delete_event 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 calendar.delete_event completely? +

Set action: deny in the PolicyLayer policy for calendar.delete_event. 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 calendar.delete_event? +

calendar.delete_event is provided by the Nucleus Apple MCP server (zish-rob-crur/nucleus-apple-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Nucleus Apple tool call.

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

CHECK YOUR STACK →