sheets_append · Gworkspace MCP: Risk & Policy

WHAT IT DOES

What sheets_append does on Gworkspace

AI agents use sheets_append 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_append needs a policy

This tool creates or modifies data reversibly by adding rows to a Google Sheet. It does not execute arbitrary code, delete data irreversibly, or move money. The moderate severity reflects that an AI agent could append large volumes of incorrect data or sensitive information to shared sheets, but the operation can be undone. Confidence is high given the explicit description of the append operation.

From the tool's definition Tool name 'sheets_append' and description 'Append rows to the end of a sheet' indicate data modification. Appending is a reversible write operation that adds rows to an existing spreadsheet.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

sheets_append Rate-limited

sheets_append 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_append": {
      "limits": [
        {
          "counter": "sheets_append_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_append

What does the sheets_append tool do? +

Append rows to the end of a sheet. 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_append? +

Register the Gworkspace MCP server in PolicyLayer and add a rule for sheets_append: 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_append? +

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

Can I rate-limit sheets_append? +

Yes. Add a rate_limit block to the sheets_append 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_append completely? +

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

sheets_append 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.