scale_stl · MCP 3D Printer Server MCP: Risk & Policy

WHAT IT DOES

What scale_stl does on MCP 3D Printer Server

AI agents use scale_stl to create or update resources in MCP 3D Printer Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your MCP 3D Printer Server environment.

WHY IT NEEDS A POLICY

Why scale_stl needs a policy

Scaling an STL model modifies the geometry of the file, which is a reversible write operation (the original could be preserved or the scaling could be undone). It does not delete data, execute code, or involve financial transactions. The blast radius is medium since an incorrectly scaled model could cause print failures or wasted materials, but it is not irreversible by nature.

From the tool's definition Scale an STL model uniformly or along specific axes

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

scale_stl Rate-limited

scale_stl 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": {
    "scale_stl": {
      "limits": [
        {
          "counter": "scale_stl_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 MCP 3D Printer Server, so you can run agents against it safely.

FAQ

Questions about scale_stl

What does the scale_stl tool do? +

Scale an STL model uniformly or along specific axes. It is categorised as a Write tool in the MCP 3D Printer 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 scale_stl? +

Register the MCP 3D Printer Server MCP server in PolicyLayer and add a rule for scale_stl: 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 MCP 3D Printer Server. Nothing to install.

What risk level is scale_stl? +

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

Can I rate-limit scale_stl? +

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

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

scale_stl is provided by the MCP 3D Printer Server MCP server (mcpflow/dmontgomery40_mcp-3d-printer-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.