insert_watermark

A write tool on the Docx MCP server.

SERVERDocx SOURCEsecurityronin/docx-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/securityronin-docx-mcp/insert-watermark.md

WHAT IT DOES

What insert_watermark does on Docx

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

RISK

Why insert_watermark is rated Medium

Inserting a watermark modifies document structure and appearance but does not destroy data or execute arbitrary code. It is a reversible write operation consistent with the server's editing capabilities. Severity is medium because while watermarks can alter document appearance and metadata, they do not cause data loss, financial impact, or arbitrary execution.

From the tool's definition Tool name 'insert_watermark' indicates creation/modification of document content. Server description states it enables 'editing...Microsoft Word documents' and 'precise OOXML-level document manipulation.' Watermarks are reversible visual elements added to…

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs insert_watermark safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Docx, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For insert_watermark, this is the rule to start with:

insert_watermark Rate-limited

insert_watermark 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": {
    "insert_watermark": {
      "limits": [
        {
          "counter": "insert_watermark_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Docx, apply this rule, and every insert_watermark call is checked against it from then on.

FAQ

Questions about insert_watermark

What does the insert_watermark tool do? +

insert_watermark is a write tool on the Docx MCP server. It is categorised as a Write tool in the Docx 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_watermark? +

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

What risk level is insert_watermark? +

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

Can I rate-limit insert_watermark? +

Yes. Add a rate_limit block to the insert_watermark 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_watermark completely? +

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

insert_watermark is provided by the Docx MCP server (securityronin/docx-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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