update_spreadsheet · Gg MCP: Risk & Policy

WHAT IT DOES

What update_spreadsheet does on Gg

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

WHY IT NEEDS A POLICY

Why update_spreadsheet needs a policy

The tool modifies existing spreadsheet data by updating cell values within specified ranges. This is a Write operation—reversible data modification rather than destructive deletion or irreversible removal.

From the tool's definition Tool description states it "Update cells in a spreadsheet" with ability to specify ranges and provide values via JSON arrays. This is a modification operation that creates or alters spreadsheet data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_spreadsheet Rate-limited

update_spreadsheet 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": {
    "update_spreadsheet": {
      "limits": [
        {
          "counter": "update_spreadsheet_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 Gg, so you can run agents against it safely.

FAQ

Questions about update_spreadsheet

What does the update_spreadsheet tool do? +

Update cells in a spreadsheet. Values format: JSON 2D array, e.g. '[["A","B"],["1","2"]]'. Range: 'Sheet1!A1'. It is categorised as a Write tool in the Gg MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_spreadsheet? +

Register the Gg MCP server in PolicyLayer and add a rule for update_spreadsheet: 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 Gg. Nothing to install.

What risk level is update_spreadsheet? +

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

Can I rate-limit update_spreadsheet? +

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

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

update_spreadsheet is provided by the Gg MCP server (tannht/google-cloud-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.