append_doc_text_tool

THE RISK

Medium Risk

Why append_doc_text_tool needs a policy

This tool modifies an existing Google Doc by adding text to it. This is a reversible write operation (text can be removed), making it a Write category tool. Severity is medium because an AI agent could append unwanted or harmful content to important documents.

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

Documented attack patterns abuse exactly the kind of access append_doc_text_tool gives an agent:

POLICY

How to control append_doc_text_tool

PolicyLayer is an MCP gateway — it sits between your AI agents and Apps Script MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for append_doc_text_tool:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "append_doc_text_tool": {
      "limits": [
        {
          "counter": "append_doc_text_tool_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

append_doc_text_tool 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.

Create a free account and register Apps Script MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

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EXPLORE

Related tools and policies

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about append_doc_text_tool

What does the append_doc_text_tool tool do? +

Append text to the end of a Google Doc. It is categorised as a Write tool in the Apps Script MCP 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_doc_text_tool? +

Register the Apps Script MCP server in PolicyLayer and add a rule for append_doc_text_tool: 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 Apps Script MCP. Nothing to install.

What risk level is append_doc_text_tool? +

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

Can I rate-limit append_doc_text_tool? +

Yes. Add a rate_limit block to the append_doc_text_tool 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_doc_text_tool completely? +

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

append_doc_text_tool is provided by the Apps Script MCP server (sam-ent/google-automation-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Apps Script MCP tool call.

Start from Apps Script MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →