respond_to_event · Google Calendar MCP: Risk & Policy

WHAT IT DOES

What respond_to_event does on Google Calendar MCP

AI agents use respond_to_event to create or update resources in Google Calendar MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Google Calendar MCP environment.

WHY IT NEEDS A POLICY

Why respond_to_event needs a policy

This tool modifies the user's response status on a calendar event invitation. It is a reversible write operation — the RSVP status can be changed again at any time. No data is deleted, no code is executed, and no financial transaction occurs. Misuse has minimal blast radius.

From the tool's definition RSVP to a calendar event (accept, tentative, or decline)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

respond_to_event Rate-limited

respond_to_event stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "respond_to_event": {
      "limits": [
        {
          "counter": "respond_to_event_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Google Calendar MCP, so you can run agents against it safely.

FAQ

Questions about respond_to_event

What does the respond_to_event tool do? +

RSVP to a calendar event (accept, tentative, or decline). It is categorised as a Write tool in the Google Calendar MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on respond_to_event? +

Register the Google Calendar MCP server in PolicyLayer and add a rule for respond_to_event: 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 Calendar MCP. Nothing to install.

What risk level is respond_to_event? +

respond_to_event is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit respond_to_event? +

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

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

respond_to_event is provided by the Google Calendar MCP server (paytience/google-calendar-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.