modify_3d_model · OpenSCAD MCP Server MCP: Risk & Policy

WHAT IT DOES

What modify_3d_model does on OpenSCAD MCP Server

AI agents use modify_3d_model 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 modify_3d_model needs a policy

This tool modifies existing 3D models, which is a Write operation (creates or modifies data reversibly). Severity is medium because misuse could result in unintended model generation, wasted compute resources, or invalid 3D files sent to printers, but changes are typically reversible by re-modifying or deleting the model.

From the tool's definition Tool name 'modify_3d_model' and description 'Modify an existing 3D model' indicate reversible modification of model data. The tool creates or updates 3D model parameters/files without permanent deletion.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

modify_3d_model Rate-limited

modify_3d_model 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": {
    "modify_3d_model": {
      "limits": [
        {
          "counter": "modify_3d_model_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 modify_3d_model

What does the modify_3d_model tool do? +

Modify an existing 3D model. 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 modify_3d_model? +

Register the OpenSCAD MCP Server MCP server in PolicyLayer and add a rule for modify_3d_model: 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 modify_3d_model? +

modify_3d_model is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit modify_3d_model? +

Yes. Add a rate_limit block to the modify_3d_model 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 modify_3d_model completely? +

Set action: deny in the PolicyLayer policy for modify_3d_model. 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 modify_3d_model? +

modify_3d_model 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.