AI agents call list_calendar to retrieve information from Email without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves calendar event information from the Outlook desktop client. It performs a passive read operation that does not modify data, execute code, or trigger external actions. The only informational exposure is the user's calendar schedule, which has minimal blast radius if misused by an AI agent.
From the tool's definition Tool name 'list_calendar' and description 'List upcoming calendar events' indicate retrieval/query of calendar data with no modification or side effects.
Attacks that exploit this kind of access
List upcoming calendar events. It is categorised as a Read tool in the Email MCP Server, which means it retrieves data without modifying state.
Register the Email MCP server in PolicyLayer and add a rule for list_calendar: 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 Email. Nothing to install.
list_calendar 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_calendar 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_calendar. 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_calendar is provided by the Email MCP server (kerodkibatu/email-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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