create_sheet · Google Sheets MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_sheet does on Google Sheets MCP Server

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

WHY IT NEEDS A POLICY

Why create_sheet needs a policy

Creating a new sheet modifies the spreadsheet structure reversibly—sheets can be deleted and the action does not irreversibly destroy data. This is a Write operation rather than Destructive because the change is non-destructive. Severity is medium because misuse could clutter or disorganize a spreadsheet, but the blast radius is contained to a single spreadsheet and the action is undoable.

From the tool's definition Tool creates a new sheet in a spreadsheet. The description 'Creates a new sheet' (translated from Japanese: '新しいシートを作成します') and the sibling tools (append_row, write_sheet, read_sheet) confirm this is a write operation that adds structure to a spreadsheet.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_sheet Rate-limited

create_sheet 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": {
    "create_sheet": {
      "limits": [
        {
          "counter": "create_sheet_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 Sheets MCP Server, so you can run agents against it safely.

FAQ

Questions about create_sheet

What does the create_sheet tool do? +

新しいシートを作成します. It is categorised as a Write tool in the Google Sheets MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_sheet? +

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

What risk level is create_sheet? +

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

Can I rate-limit create_sheet? +

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

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

create_sheet is provided by the Google Sheets MCP Server MCP server (kyohei-9841/google-spreadsheet-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.