set_image_size

Resize an embedded image by updating its EMU extent attributes.

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/set-image-size.md

WHAT IT DOES

What set_image_size does on Docx

AI agents use set_image_size 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 set_image_size is rated Medium

This tool modifies document structure reversibly by altering image dimensions. It does not execute code, trigger external operations, or irreversibly delete data. The change is editable/undoable, making it a Write action rather than Execute or Destructive. Severity is medium because misuse could corrupt document layout or render images unusable, but the effect is contained to a single image property and reversible.

From the tool's definition Tool description states it "Resize[s] an embedded image by updating its EMU extent attributes" — this modifies document content via dimension changes to embedded objects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs set_image_size 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 set_image_size, this is the rule to start with:

set_image_size Rate-limited

set_image_size 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": {
    "set_image_size": {
      "limits": [
        {
          "counter": "set_image_size_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 set_image_size call is checked against it from then on.

FAQ

Questions about set_image_size

What does the set_image_size tool do? +

Resize an embedded image by updating its EMU extent attributes. 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 set_image_size? +

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

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

Can I rate-limit set_image_size? +

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

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

set_image_size 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.

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