import_stl

A write tool on the FreeCAD Robust MCP server.

SERVERFreeCAD Robust MCP Server SOURCEspkane/freecad-addon-robust-mcp-server

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/spkane-freecad-addon-robust-mcp-server/import-stl.md

WHAT IT DOES

What import_stl does on FreeCAD Robust MCP Server

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

RISK

Why import_stl is rated Medium

The tool reads an external STL file and writes/creates its geometry into the FreeCAD project, making it a Write operation. It's not Destructive (reversible via undo), not Execute (not arbitrary code), and not Financial. Severity is medium because importing malicious geometry could cause DoS or model corruption, but the impact is typically contained to the current project.

From the tool's definition Tool name 'import_stl' indicates importing STL (3D mesh) files into FreeCAD. The sibling tools (add_sketch_*, activate_workbench) confirm this server modifies 3D models. Import operations create new geometric data in the project.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs import_stl safely

PolicyLayer is an MCP gateway: it sits between your AI agents and FreeCAD Robust MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For import_stl, this is the rule to start with:

import_stl Rate-limited

import_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": {
    "import_stl": {
      "limits": [
        {
          "counter": "import_stl_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect FreeCAD Robust MCP Server, apply this rule, and every import_stl call is checked against it from then on.

FAQ

Questions about import_stl

What does the import_stl tool do? +

import_stl is a write tool on the FreeCAD Robust MCP Server MCP server. It is categorised as a Write tool in the FreeCAD Robust 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 import_stl? +

Register the FreeCAD Robust MCP Server MCP server in PolicyLayer and add a rule for import_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 FreeCAD Robust MCP Server. Nothing to install.

What risk level is import_stl? +

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

Can I rate-limit import_stl? +

Yes. Add a rate_limit block to the import_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 import_stl completely? +

Set action: deny in the PolicyLayer policy for import_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 import_stl? +

import_stl is provided by the FreeCAD Robust MCP Server MCP server (spkane/freecad-addon-robust-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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