getCalendarFreeBusy

THE RISK

Low Risk

Why getCalendarFreeBusy needs a policy

This tool retrieves calendar availability information, which is a read-only query with no side effects. It does not create, modify, delete, or execute any actions. The only potential concern is privacy (seeing others' busy/free status), but this is a data retrieval operation, not a destructive or execute-class risk.

From the tool's definition The tool name and description indicate it 'Check[s] free/busy information for calendars in a time range' — a query operation that retrieves scheduling data without modifying, deleting, or executing operations.

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

POLICY

How to control getCalendarFreeBusy

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

policy.json

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

getCalendarFreeBusy 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 Google Workspace 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.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Google Workspace 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 getCalendarFreeBusy

What does the getCalendarFreeBusy tool do? +

Check free/busy information for calendars in a time range. It is categorised as a Read tool in the Google Workspace MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on getCalendarFreeBusy? +

Register the Google Workspace MCP Server MCP server in PolicyLayer and add a rule for getCalendarFreeBusy: 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 Google Workspace MCP Server. Nothing to install.

What risk level is getCalendarFreeBusy? +

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

Can I rate-limit getCalendarFreeBusy? +

Yes. Add a rate_limit block to the getCalendarFreeBusy 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 getCalendarFreeBusy completely? +

Set action: deny in the PolicyLayer policy for getCalendarFreeBusy. 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 getCalendarFreeBusy? +

getCalendarFreeBusy is provided by the Google Workspace MCP Server MCP server (sputnicyoji/google-workspace-mcp-with-script). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Google Workspace MCP Server tool call.

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

CHECK YOUR STACK →