insert_doc_elements

THE RISK

Medium Risk

Why insert_doc_elements needs a policy

This tool creates or modifies document content reversibly by inserting structural elements. It does not execute code, delete data irreversibly, or move money. However, the severity is elevated to 'high' rather than 'medium' because it operates on Google Workspace documents which may contain sensitive business information, and unauthorized insertion of elements could corrupt important documents or insert misleading…

From the tool's definition The tool description states it can "Insert structural elements like tables, lists, or page breaks" into documents. The verb "Insert" indicates modification of document content.

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

POLICY

How to control insert_doc_elements

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

policy.json

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

insert_doc_elements 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 VaultAssist — 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 →

Free to start. No card required.

EXPLORE

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Write tools on other servers

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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 insert_doc_elements

What does the insert_doc_elements tool do? +

Insert structural elements like tables, lists, or page breaks. It is categorised as a Write tool in the VaultAssist MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on insert_doc_elements? +

Register the VaultAssist MCP server in PolicyLayer and add a rule for insert_doc_elements: 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 VaultAssist. Nothing to install.

What risk level is insert_doc_elements? +

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

Can I rate-limit insert_doc_elements? +

Yes. Add a rate_limit block to the insert_doc_elements 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 insert_doc_elements completely? +

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

insert_doc_elements is provided by the VaultAssist MCP server (3xcaffeine/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every VaultAssist tool call.

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

CHECK YOUR STACK →