calendar_list_accounts

Lists all configured Google accounts that can be used with the calendar tools. This tool does not require a user_id as it lists available accounts before selection.

ServerMCP Google Workspace Server
CategoryRead

How to control calendar_list_accounts ↓

WHAT IT DOES

What calendar_list_accounts does on MCP Google Workspace Server

AI agents call calendar_list_accounts to retrieve information from MCP Google Workspace 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 calendar_list_accounts needs a policy

This tool retrieves metadata about available accounts for informational purposes only. There are no side effects, data modifications, deletions, or financial implications. The blast radius of misuse is minimal—an attacker gains visibility into which accounts are configured but cannot authenticate as those accounts or perform actions on them. This is a classic Read operation.

From the tool's definition Tool name and description indicate it 'Lists all configured Google accounts' — a retrieval operation with no modification, deletion, or execution of external operations.

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

POLICY

How to control calendar_list_accounts

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

policy.json

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

calendar_list_accounts 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 MCP Google Workspace 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 MCP Google Workspace Server tools

Destructive calendar_delete_event Deletes an event from the specified Google Calendar. Destructive gmail_delete_draft Deletes a Gmail draft message by its ID. This action cannot be undone. Write calendar_create_event Creates a new event in the specified Google Calendar. Write gmail_archive Archives a Gmail message by removing it from the inbox. Write gmail_bulk_archive Archives multiple Gmail messages by removing them from the inbox. Write gmail_bulk_save_attachments Saves multiple Gmail attachments to disk by their message IDs and attachment IDs in a sing Write gmail_create_draft Creates a draft email message from scratch in Gmail with specified recipient, subject, bod Read calendar_get_events Retrieves calendar events from the user\

All 16 MCP Google Workspace Server tools →

Read tools on other servers

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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 calendar_list_accounts

What does the calendar_list_accounts tool do? +

Lists all configured Google accounts that can be used with the calendar tools. This tool does not require a user_id as it lists available accounts before selection. It is categorised as a Read tool in the MCP Google Workspace Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on calendar_list_accounts? +

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

What risk level is calendar_list_accounts? +

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

Can I rate-limit calendar_list_accounts? +

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

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

calendar_list_accounts is provided by the MCP Google Workspace Server MCP server (j3k0/mcp-google-workspace). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP Google Workspace Server tool call.

Start from MCP Google Workspace 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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16 MCP Google Workspace Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.