Lists all calendars in your Outlook account
AI agents call list-calendars to retrieve information from Outlook Assistant without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only query operation that retrieves calendar information without creating, modifying, deleting, or executing any actions. It has minimal blast radius if misused, as it only exposes calendar metadata the user already has access to.
From the tool's definition Tool name and description: 'Lists all calendars in your Outlook account' — retrieves calendar metadata with no modification or side effects.
Attacks that exploit this kind of access
Lists all calendars in your Outlook account. It is categorised as a Read tool in the Outlook Assistant MCP Server, which means it retrieves data without modifying state.
Register the Outlook Assistant MCP server in PolicyLayer and add a rule for 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 Outlook Assistant. Nothing to install.
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 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 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.
list-calendars is provided by the Outlook Assistant MCP server (titanzero/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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