append_text · Google Docs MCP Server MCP: Risk & Policy

WHAT IT DOES

What append_text does on Google Docs MCP Server

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

WHY IT NEEDS A POLICY

Why append_text needs a policy

This tool adds content to an existing Google Doc, which is a reversible write operation. It modifies a document by appending text but does not delete or overwrite existing content. Misuse could pollute documents with unwanted content, but the action is not irreversible as the appended text could be removed.

From the tool's definition Append text to the end of a Google Doc

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

append_text Rate-limited

append_text 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_text": {
      "limits": [
        {
          "counter": "append_text_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 Docs MCP Server, so you can run agents against it safely.

FAQ

Questions about append_text

What does the append_text tool do? +

Append text to the end of a Google Doc. It is categorised as a Write tool in the Google Docs 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_text? +

Register the Google Docs MCP Server MCP server in PolicyLayer and add a rule for append_text: 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 Docs MCP Server. Nothing to install.

What risk level is append_text? +

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

Can I rate-limit append_text? +

Yes. Add a rate_limit block to the append_text 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_text completely? +

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

append_text is provided by the Google Docs MCP Server MCP server (mackenzienolan/google-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.