Create a recurring calendar event
AI agents use outlook_create_recurring_event 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.
This tool creates new calendar data in Microsoft Outlook, which is a reversible write operation. It does not execute arbitrary commands, delete data, or transfer money. The severity is medium because creating calendar events could cause scheduling conflicts, duplicate bookings, or calendar spam if misused by an AI agent, but the impact is limited to the user's calendar and recoverable through deletion.
From the tool's definition Tool creates calendar events with recurrence patterns. The description states it will 'Create a recurring calendar event', and the sibling tool 'outlook_build_recurrence_pattern' indicates structured scheduling capability.
Documented attack patterns abuse exactly the kind of access outlook_create_recurring_event gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Outlook, and nothing reaches the server without passing your rules. This is the rule we recommend for outlook_create_recurring_event:
{
"version": "1",
"default": "deny",
"tools": {
"outlook_create_recurring_event": {
"limits": [
{
"counter": "outlook_create_recurring_event_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}outlook_create_recurring_event 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.
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Create a recurring calendar event. 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.
Register the Outlook MCP server in PolicyLayer and add a rule for outlook_create_recurring_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 Outlook. Nothing to install.
outlook_create_recurring_event is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the outlook_create_recurring_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.
Set action: deny in the PolicyLayer policy for outlook_create_recurring_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.
outlook_create_recurring_event is provided by the Outlook MCP server (xenoxilus/outlook-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Outlook, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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43 Outlook tools catalogued and risk-classified — across an index of 43,000+ MCP servers.