switch_account · Google Calendar MCP: Risk & Policy

WHAT IT DOES

What switch_account does on Google Calendar MCP

AI agents use switch_account 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 switch_account needs a policy

This tool changes application state by switching the active account context, which is a reversible modification. It does not retrieve data (Read), execute external commands (Execute), delete anything (Destructive), or move money (Financial).

From the tool's definition Tool name 'switch_account' and description 'Switch to a different connected Google account' indicate a state-changing operation that modifies which account is active.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

switch_account Rate-limited

switch_account 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": {
    "switch_account": {
      "limits": [
        {
          "counter": "switch_account_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 switch_account

What does the switch_account tool do? +

Switch to a different connected Google account. 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 switch_account? +

Register the Google Calendar MCP server in PolicyLayer and add a rule for switch_account: 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 switch_account? +

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

Can I rate-limit switch_account? +

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

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

switch_account 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.