calendar_create · Mailgent MCP Server MCP: Risk & Policy

WHAT IT DOES

What calendar_create does on Mailgent MCP Server

AI agents use calendar_create to create or update resources in Mailgent MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mailgent MCP Server environment.

WHY IT NEEDS A POLICY

Why calendar_create needs a policy

This tool creates a new calendar event, which is a reversible modification of data. It does not execute arbitrary code, delete data, or move money. The severity is medium because creating calendar events could be abused to schedule fraudulent meetings or flood the calendar, but the impact is limited to the calendar system and can be undone via calendar_delete.

From the tool's definition Tool name is 'calendar_create' and description states 'Create a new event on this identity', which directly indicates data creation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

calendar_create Rate-limited

calendar_create stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "calendar_create": {
      "limits": [
        {
          "counter": "calendar_create_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Mailgent MCP Server, so you can run agents against it safely.

FAQ

Questions about calendar_create

What does the calendar_create tool do? +

Create a new event on this identity. It is categorised as a Write tool in the Mailgent MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on calendar_create? +

Register the Mailgent MCP Server MCP server in PolicyLayer and add a rule for calendar_create: 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 Mailgent MCP Server. Nothing to install.

What risk level is calendar_create? +

calendar_create is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit calendar_create? +

Yes. Add a rate_limit block to the calendar_create 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_create completely? +

Set action: deny in the PolicyLayer policy for calendar_create. 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_create? +

calendar_create is provided by the Mailgent MCP Server MCP server (loomal-ai/loomal-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.