createEvent · Outlook MCP: Risk & Policy

WHAT IT DOES

What createEvent does on Outlook

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

WHY IT NEEDS A POLICY

Why createEvent needs a policy

Creating calendar events is a reversible write operation that modifies user data (calendar state) without permanent deletion or financial impact. Severity is medium because malicious event creation could cause scheduling disruption and social engineering risks (fake meeting invitations), but the action is recoverable and doesn't access sensitive personal data or execute arbitrary code.

From the tool's definition Tool name 'createEvent' combined with server purpose (Outlook calendar access). No description provided, but context indicates calendar manipulation capability.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

createEvent Rate-limited

createEvent 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": {
    "createEvent": {
      "limits": [
        {
          "counter": "createevent_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 Outlook, so you can run agents against it safely.

FAQ

Questions about createEvent

What does the createEvent tool do? +

createEvent. It is categorised as a Write tool in the Outlook MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on createEvent? +

Register the Outlook MCP server in PolicyLayer and add a rule for createEvent: 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 Outlook. Nothing to install.

What risk level is createEvent? +

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

Can I rate-limit createEvent? +

Yes. Add a rate_limit block to the createEvent 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 createEvent completely? +

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

createEvent is provided by the Outlook MCP server (lihaokun/outlook-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.