crop-dicom-image · DICOM- MCP: Risk & Policy

WHAT IT DOES

What crop-dicom-image does on DICOM-MCP

AI agents use crop-dicom-image to create or update resources in DICOM-MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your DICOM-MCP environment.

WHY IT NEEDS A POLICY

Why crop-dicom-image needs a policy

Cropping a DICOM image modifies the image data by removing boundary regions. This is a Write operation as it transforms the loaded image. However, without clarity on whether it overwrites the original or creates a new output, there is some ambiguity. Medical image modification carries medium severity due to potential clinical implications if original data is altered.

From the tool's definition 'Crop a loaded DICOM image by removing boundary percentage' — modifies image data by cropping/removing portions

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

crop-dicom-image Rate-limited

crop-dicom-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": {
    "crop-dicom-image": {
      "limits": [
        {
          "counter": "crop-dicom-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 DICOM-MCP, so you can run agents against it safely.

FAQ

Questions about crop-dicom-image

What does the crop-dicom-image tool do? +

Crop a loaded DICOM image by removing boundary percentage. It is categorised as a Write tool in the DICOM-MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on crop-dicom-image? +

Register the DICOM- MCP server in PolicyLayer and add a rule for crop-dicom-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 DICOM-MCP. Nothing to install.

What risk level is crop-dicom-image? +

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

Can I rate-limit crop-dicom-image? +

Yes. Add a rate_limit block to the crop-dicom-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 crop-dicom-image completely? +

Set action: deny in the PolicyLayer policy for crop-dicom-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 crop-dicom-image? +

crop-dicom-image is provided by the DICOM- MCP server (shaunporwal/dicom-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.