List all calendars for the authenticated user. Returns calendar IDs that can be used with other calendar tools.
AI agents call list-calendars to retrieve information from Outlook OAuth 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 calendar metadata (IDs and properties) for the authenticated user but does not create, modify, delete, or execute any operations. It is purely informational and foundational for other calendar operations. The blast radius of misuse is minimal—an attacker can only discover which calendars exist for the user, not access their contents or modify them without separate tools.
From the tool's definition Tool name 'list-calendars' and description 'List all calendars for the authenticated user. Returns calendar IDs that can be used with other calendar tools.' indicate a query/retrieval operation with no side effects or data modification.
Attacks that exploit this kind of access
List all calendars for the authenticated user. Returns calendar IDs that can be used with other calendar tools. It is categorised as a Read tool in the Outlook OAuth MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Outlook OAuth MCP Server 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 OAuth MCP Server. 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 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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