rearrange_schedule · Gcal MCP: Risk & Policy

WHAT IT DOES

What rearrange_schedule does on Gcal

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

WHY IT NEEDS A POLICY

Why rearrange_schedule needs a policy

This tool modifies the order or timing of existing calendar events to optimize the daily schedule, which constitutes reversible data modification (Write category). It does not delete events (Destructive), execute arbitrary code (Execute), or involve financial transactions (Financial).

From the tool's definition Tool name is 'rearrange_schedule' and description states 'Re-optimize today', indicating modification of calendar/schedule data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

rearrange_schedule Rate-limited

rearrange_schedule 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": {
    "rearrange_schedule": {
      "limits": [
        {
          "counter": "rearrange_schedule_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 Gcal, so you can run agents against it safely.

FAQ

Questions about rearrange_schedule

What does the rearrange_schedule tool do? +

Re-optimize today. It is categorised as a Write tool in the Gcal MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on rearrange_schedule? +

Register the Gcal MCP server in PolicyLayer and add a rule for rearrange_schedule: 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 Gcal. Nothing to install.

What risk level is rearrange_schedule? +

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

Can I rate-limit rearrange_schedule? +

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

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

rearrange_schedule is provided by the Gcal MCP server (kwikkid/gcalcli). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.