calendar_delete_event

THE RISK

Critical Risk

Why calendar_delete_event needs a policy

This tool permanently removes calendar events, which cannot be undone. Permanent deletion is the hallmark of the Destructive category. While the blast radius is contained to calendar events (not financial or system-critical), unauthorized deletion of calendar entries could disrupt scheduling, meetings, and organizational workflows. High severity due to irreversible nature and potential operational impact.

From the tool's definition Tool description explicitly states 'Delete a Synology Calendar event permanently.' The word 'Delete' combined with 'permanently' indicates irreversible data loss. The requirement for 'confirm=true' confirms intentional destructive action.

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 Synology Office, 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 Synology Office — 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 Synology Office tools

Destructive drive_delete_file Delete a file or folder in Synology Drive (moves to trash by default). Set confirm=true to Destructive spreadsheet_delete_file WARNING: Permanently delete an ENTIRE spreadsheet file (.osheet). Destructive spreadsheet_delete_sheet Delete a sheet tab from a Synology Spreadsheet. This action cannot be undone. Provide eith Write spreadsheet_append_rows Append rows to the end of existing data in a Synology Spreadsheet sheet. Provide either fi Write drive_get_sharing_link Generate or retrieve a sharing link for a Synology Drive file with configurable permission Write calendar_create_calendar Create a new Synology Calendar. Write calendar_create_event Create a new Synology Calendar event. Requires confirm=true. Write calendar_update_event Update an existing Synology Calendar event. Requires confirm=true.

All 39 Synology Office tools →

Destructive tools on other servers

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Go deeper

Critical-risk tools in Synology Office → 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 Synology Calendar event permanently. Requires confirm=true. It is categorised as a Destructive tool in the Synology Office 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 Synology Office 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 Synology Office. 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 Synology Office MCP server (vocweb/synology-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Synology Office tool call.

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

CHECK YOUR STACK →