check_attendee_availability

ServerMicrosoft Graph MCP Server
CategoryRead

How to control check_attendee_availability ↓

WHAT IT DOES

What check_attendee_availability does on Microsoft Graph MCP Server

AI agents call check_attendee_availability to retrieve information from Microsoft Graph MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why check_attendee_availability needs a policy

This tool retrieves calendar availability information for attendees to inform scheduling decisions. It has no side effects—it does not create, modify, delete, or execute actions. The capability to read free/busy status is foundational to Write-category tools like manage_my_event, but the tool itself is purely informational.

From the tool's definition Tool description states it "Check[s] availability of attendees for a given date" and "calculates time range based on all attendees." The workflow explicitly notes it is used "before calling manage_my_event" to find meeting times, indicating it retrieves and…

Documented attack patterns abuse exactly the kind of access check_attendee_availability gives an agent:

POLICY

How to control check_attendee_availability

PolicyLayer is an MCP gateway — it sits between your AI agents and Microsoft Graph MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for check_attendee_availability:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "check_attendee_availability": {}
  }
}

check_attendee_availability is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Microsoft Graph MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

Related tools and policies

More Microsoft Graph MCP Server tools

Destructive manage_emails Manage emails with multiple actions. Supports moving, deleting, archiving, flagging, and c Destructive manage_mail_folder Manage mail folders. Supports list, create, delete, rename, get_details, and move operatio Write manage_event_as_attendee Manage calendar events where you are an attendee (events organized by others). Actions: ac Write manage_event_as_organizer Manage calendar events where you are the organizer (events you created). Actions: create, Write manage_templates Manage email templates stored as drafts in a Templates folder. Templates are draft emails Write send_email Send emails directly without creating drafts. Supports three actions: Write user_settings Manage user settings with two actions: Read browse_email_cache Browse emails in the cache with pagination. Returns summary information with number column

All 19 Microsoft Graph MCP Server tools →

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about check_attendee_availability

What does the check_attendee_availability tool do? +

Check availability of attendees for a given date. WORKFLOW: Typically use before calling manage_my_event with create action to find optimal meeting times. Automatically includes the organizer (you) in the availability check to ensure overlap-free time slots. Automatically calculates time range based on all attendees. It is categorised as a Read tool in the Microsoft Graph MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on check_attendee_availability? +

Register the Microsoft Graph MCP Server MCP server in PolicyLayer and add a rule for check_attendee_availability: 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 Graph MCP Server. Nothing to install.

What risk level is check_attendee_availability? +

check_attendee_availability is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit check_attendee_availability? +

Yes. Add a rate_limit block to the check_attendee_availability 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.

How do I block check_attendee_availability completely? +

Set action: deny in the PolicyLayer policy for check_attendee_availability. 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.

What MCP server provides check_attendee_availability? +

check_attendee_availability is provided by the Microsoft Graph MCP Server MCP server (marlonluo2018/microsoft_graph_mcp_server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Microsoft Graph MCP Server tool call.

Start from Microsoft Graph MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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19 Microsoft Graph MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.