Create a calendar event draft without sending invitations. Event is saved to calendar but attendees NOT notified until user sends from Outlook. TEAMS MEETINGS: - Set isOnlineMeeting=true (default) to auto-generate Teams meeting link - Link appears in onlineMeetingUrl field and is included in invi...
AI agents use create-draft-calendar-event to create or update resources in Outlook OAuth MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Outlook OAuth MCP Server environment.
The tool creates a draft calendar event that is persisted to the user's calendar. While it does not immediately notify attendees or finalize commitments, it does create and store data in the calendar system. This is a Write operation because the event is saved and can later be sent (creating obligations).
From the tool's definition Tool description states 'Create a calendar event draft' and 'Event is saved to calendar' — this creates and modifies calendar data.
Attacks that exploit this kind of access
Create a calendar event draft without sending invitations. Event is saved to calendar but attendees NOT notified until user sends from Outlook. TEAMS MEETINGS: - Set isOnlineMeeting=true (default) to auto-generate Teams meeting link - Link appears in onlineMeetingUrl field and is included in invitations IN-PERSON MEETINGS: - Set isOnlineMeeting=false for physical meetings - Set location field to room name/address Use this to prepare meetings for user review before sending invitations. Safer than create-calendar-event (which sends immediately). Draft event appears with. It is categorised as a Write tool in the Outlook OAuth MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Outlook OAuth MCP Server MCP server in PolicyLayer and add a rule for create-draft-calendar-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 OAuth MCP Server. Nothing to install.
create-draft-calendar-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 create-draft-calendar-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 create-draft-calendar-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.
create-draft-calendar-event is provided by the Outlook OAuth MCP Server MCP server (leonine-studios/useful-outlook-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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