append_to_document · Enhanced MCP Server MCP: Risk & Policy

WHAT IT DOES

What append_to_document does on Enhanced MCP Server

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

WHY IT NEEDS A POLICY

Why append_to_document needs a policy

This tool adds content to an existing Google Document. It is a write operation (creating/modifying data) and is reversible in principle (the appended text can be removed). It does not delete, execute code, or involve financial transactions. Severity is medium because it could be used to modify important documents at scale.

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

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 Enhanced MCP Server, 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 Document. It is categorised as a Write tool in the Enhanced 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_to_document? +

Register the Enhanced MCP Server 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 Enhanced MCP Server. 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 Enhanced MCP Server MCP server (pbulbule13/mcpwithgoogle). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.