List calendar events. Provide start_date and end_date to expand recurring events into individual occurrences (uses calendarView). Without dates, returns recent events without recurring expansion. Use cal_get_event with an event ID from THIS response to get full details.
AI agents call cal_list_events to retrieve information from M365 without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only retrieves and queries calendar event data with no side effects. Users can view events but cannot create, modify, or delete them with this tool alone. The ability to list events is a read-only operation with minimal security risk, though it could expose calendar information if misused by an agent with overly broad calendar access permissions.
From the tool's definition Tool description states it 'List calendar events' and retrieves event data without modification. The function uses 'calendarView' to expand recurring events and returns recent events or events within a date range.
Attacks that exploit this kind of access
List calendar events. Provide start_date and end_date to expand recurring events into individual occurrences (uses calendarView). Without dates, returns recent events without recurring expansion. Use cal_get_event with an event ID from THIS response to get full details. It is categorised as a Read tool in the M365 MCP Server, which means it retrieves data without modifying state.
Register the M365 MCP server in PolicyLayer and add a rule for cal_list_events: 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 M365. Nothing to install.
cal_list_events is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the cal_list_events 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 cal_list_events. 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.
cal_list_events is provided by the M365 MCP server (swamirama/m365-mcp-server). 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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