Create a new event on the calendar. Time in ISO format (e.g., '2026-01-14T02:16:17.478'). description and location are optional notes/place for the event.
AI agents use create_event to create or update resources in CalDAV MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your CalDAV MCP Server environment.
This tool creates (writes) new calendar events reversibly without deleting or overwriting existing data. It has moderate severity because a compromised agent could flood a calendar with spam events or create misleading/false appointments, causing calendar confusion and potentially missed real events, but the impact is limited to one user's calendar and reversible through deletion.
From the tool's definition Tool name 'create_event' and description 'Create a new event on the calendar' explicitly indicate creation of new calendar data. Server description states 'CRUD operations for calendar events' with create being the first operation.
Attacks that exploit this kind of access
Create a new event on the calendar. Time in ISO format (e.g., '2026-01-14T02:16:17.478'). description and location are optional notes/place for the event. It is categorised as a Write tool in the CalDAV MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the CalDAV MCP Server MCP server in PolicyLayer and add a rule for create_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 CalDAV MCP Server. Nothing to install.
create_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_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_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_event is provided by the CalDAV MCP Server MCP server (thegreatgooo/radicale-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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