append_to_document · Gg MCP: Risk & Policy

WHAT IT DOES

What append_to_document does on Gg

AI agents use append_to_document 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 append_to_document needs a policy

The tool modifies existing document data by appending text, which is a Write operation. It does not delete or irreversibly destroy data (not Destructive), does not execute arbitrary code (not Execute), and does not involve financial transactions (not Financial).

From the tool's definition Tool name 'append_to_document' and description 'Append text to the end of a Google Docs document' indicate creation/modification of document content in a reversible manner.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

append_to_document Rate-limited

append_to_document 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_to_document": {
      "limits": [
        {
          "counter": "append_to_document_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 append_to_document

What does the append_to_document tool do? +

Append text to the end of a Google Docs document. 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 append_to_document? +

Register the Gg MCP server in PolicyLayer and add a rule for append_to_document: 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 append_to_document? +

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

Can I rate-limit append_to_document? +

Yes. Add a rate_limit block to the append_to_document 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_to_document completely? +

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

append_to_document 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.