resize_image · Graphics MCP: Risk & Policy

WHAT IT DOES

What resize_image does on Graphics

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

WHY IT NEEDS A POLICY

Why resize_image needs a policy

Image resizing modifies image data but does not delete original files or perform irreversible operations if the output is saved to a new file (which is the standard pattern for image tools). The modification is reversible since the original image data can be restored. This is clearly a Write-class operation (create or modify data reversibly).

From the tool's definition Tool named 'resize_image' on a graphics manipulation server. No description provided, but based on sibling tools (apply_filter, convert_image, create_thumbnail, crop_image, flip_image, rotate_image), this is a standard image transformation operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

resize_image Rate-limited

resize_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": {
    "resize_image": {
      "limits": [
        {
          "counter": "resize_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 Graphics, so you can run agents against it safely.

FAQ

Questions about resize_image

What does the resize_image tool do? +

resize_image. It is categorised as a Write tool in the Graphics MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on resize_image? +

Register the Graphics MCP server in PolicyLayer and add a rule for resize_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 Graphics. Nothing to install.

What risk level is resize_image? +

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

Can I rate-limit resize_image? +

Yes. Add a rate_limit block to the resize_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 resize_image completely? +

Set action: deny in the PolicyLayer policy for resize_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 resize_image? +

resize_image is provided by the Graphics MCP server (lesleslie/graphics-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.