List all available calendars.
AI agents call ms365_list_calendars to retrieve information from Microsoft 365 MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and enumerates calendar metadata available to the user. It performs no write, execute, destructive, or financial operations. The information returned (calendar names, IDs, properties) is descriptive only. An AI agent misusing this tool could only over-enumerate calendars, a minor issue with low blast radius. Confidence is high given the explicit 'List' verb and straightforward retrieval semantics.
From the tool's definition Tool name 'ms365_list_calendars' and description 'List all available calendars' indicate a retrieval/query operation with no data modification, deletion, or side effects.
Attacks that exploit this kind of access
List all available calendars. It is categorised as a Read tool in the Microsoft 365 MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Microsoft 365 MCP Server MCP server in PolicyLayer and add a rule for ms365_list_calendars: 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 Microsoft 365 MCP Server. Nothing to install.
ms365_list_calendars 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 ms365_list_calendars 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 ms365_list_calendars. 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.
ms365_list_calendars is provided by the Microsoft 365 MCP Server MCP server (ronaldzuniga/ms365-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.
Teams ship this data inside their own products. See what a licence covers →