add_image · Docx MCP: Risk & Policy

WHAT IT DOES

What add_image does on Docx

AI agents use add_image 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.

WHY IT NEEDS A POLICY

Why add_image needs a policy

Adding an image to a Word document is a content modification that creates or alters data reversibly. It does not execute external code, delete data, or move money. However, it could be misused to inject malicious images, embed tracking pixels, or insert inappropriate content into documents, warranting medium severity.

From the tool's definition Tool name 'add_image' combined with server description stating it enables agents to 'edit and create Microsoft Word documents' with 'support for rich text, tables, and images'.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_image Rate-limited

add_image 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": {
    "add_image": {
      "limits": [
        {
          "counter": "add_image_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 Docx, so you can run agents against it safely.

FAQ

Questions about add_image

What does the add_image tool do? +

Add an image. 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 add_image? +

Register the Docx MCP server in PolicyLayer and add a rule for add_image: 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 add_image? +

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

Can I rate-limit add_image? +

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

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

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