append_row · Google Sheets MCP Server MCP: Risk & Policy

WHAT IT DOES

What append_row does on Google Sheets MCP Server

AI agents use append_row 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 append_row needs a policy

This tool creates new data by appending a row to a spreadsheet. It is a reversible write operation — the row can be deleted afterward — making Write the appropriate category. No code execution, deletion, or financial action is involved.

From the tool's definition append_row / スプレッドシートの最後に新しい行を追加します (adds a new row to the end of the spreadsheet)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

append_row Rate-limited

append_row 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": {
    "append_row": {
      "limits": [
        {
          "counter": "append_row_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 append_row

What does the append_row tool do? +

スプレッドシートの最後に新しい行を追加します. 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 append_row? +

Register the Google Sheets MCP Server MCP server in PolicyLayer and add a rule for append_row: 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 append_row? +

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

Can I rate-limit append_row? +

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

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

append_row 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.