create_sheet · Google Sheets MCP: Risk & Policy

WHAT IT DOES

What create_sheet does on Google Sheets MCP

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

WHY IT NEEDS A POLICY

Why create_sheet needs a policy

This tool creates new data (a spreadsheet) in persistent storage, which is a reversible Write operation. It does not execute arbitrary code, delete data, or move money. Severity is medium because a compromised agent could create many sheets, consume quota, or spam shares to unwanted addresses, but the action is reversible via deletion. Confidence is high because the intent is unambiguous from the description.

From the tool's definition Tool 'create_sheet' creates a new Google Sheet with title, spreadsheet_id, URL, optional header row, and sharing.

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, so you can run agents against it safely.

FAQ

Questions about create_sheet

What does the create_sheet tool do? +

Create a new Google Sheet with the given title. Returns the spreadsheet_id and URL. Optionally writes header row and shares the sheet with an email address. It is categorised as a Write tool in the Google Sheets 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 create_sheet? +

Register the Google Sheets 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. 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 (rpieterse/mcp-studio-google-sheets-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.