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

WHAT IT DOES

What extend_stl_base does on MCP 3D Printer Server

AI agents use extend_stl_base 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 extend_stl_base needs a policy

This tool modifies an STL file by extending its base geometry. It creates a modified version of the file, which is a reversible write operation (the original could be preserved). It does not delete data, execute code, or involve financial transactions. Severity is medium because modifying STL files used for printing could result in failed or incorrect prints if misused.

From the tool's definition Extend the base of an STL file by a specified amount

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

extend_stl_base Rate-limited

extend_stl_base 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": {
    "extend_stl_base": {
      "limits": [
        {
          "counter": "extend_stl_base_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 extend_stl_base

What does the extend_stl_base tool do? +

Extend the base of an STL file by a specified amount. 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 extend_stl_base? +

Register the MCP 3D Printer Server MCP server in PolicyLayer and add a rule for extend_stl_base: 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 extend_stl_base? +

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

Can I rate-limit extend_stl_base? +

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

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

extend_stl_base 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.