sheets_write · Gworkspace MCP: Risk & Policy

WHAT IT DOES

What sheets_write does on Gworkspace

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

WHY IT NEEDS A POLICY

Why sheets_write needs a policy

This tool creates or modifies data reversibly within Google Sheets. Writing to a sheet range is a standard data modification operation that can be undone (via undo/revision history in Sheets), distinguishing it from destructive operations.

From the tool's definition Tool name 'sheets_write' and description 'Write values to a sheet range' explicitly indicate data modification. The 2D array parameter confirms it modifies spreadsheet content.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

sheets_write Rate-limited

sheets_write 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": {
    "sheets_write": {
      "limits": [
        {
          "counter": "sheets_write_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 Gworkspace, so you can run agents against it safely.

FAQ

Questions about sheets_write

What does the sheets_write tool do? +

Write values to a sheet range. values is a 2D array. It is categorised as a Write tool in the Gworkspace MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on sheets_write? +

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

What risk level is sheets_write? +

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

Can I rate-limit sheets_write? +

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

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

sheets_write is provided by the Gworkspace MCP server (leoonic/gworkspace-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.