reject_image · OpenSCAD MCP Server MCP: Risk & Policy

WHAT IT DOES

What reject_image does on OpenSCAD MCP Server

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

WHY IT NEEDS A POLICY

Why reject_image needs a policy

This tool modifies data reversibly (images can potentially be re-submitted or restored), affecting workflow state rather than retrieving data (Read), executing arbitrary operations (Execute), or permanently destroying records (Destructive). The context of a 3D model generation pipeline suggests rejection changes image status/metadata.

From the tool's definition Tool name 'reject_image' and description 'Reject an image for 3D model generation' indicate state modification of image records in a workflow system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

reject_image Rate-limited

reject_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": {
    "reject_image": {
      "limits": [
        {
          "counter": "reject_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 OpenSCAD MCP Server, so you can run agents against it safely.

FAQ

Questions about reject_image

What does the reject_image tool do? +

Reject an image for 3D model generation. It is categorised as a Write tool in the OpenSCAD MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on reject_image? +

Register the OpenSCAD MCP Server MCP server in PolicyLayer and add a rule for reject_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 OpenSCAD MCP Server. Nothing to install.

What risk level is reject_image? +

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

Can I rate-limit reject_image? +

Yes. Add a rate_limit block to the reject_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 reject_image completely? +

Set action: deny in the PolicyLayer policy for reject_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 reject_image? +

reject_image is provided by the OpenSCAD MCP Server MCP server (jhacksman/openscad-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.