freecad_gui · FreeCAD MCP: Risk & Policy

WHAT IT DOES

What freecad_gui does on FreeCAD MCP

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

WHY IT NEEDS A POLICY

Why freecad_gui needs a policy

An AI agent can call freecad_gui faster than any human can review — one bad instruction and it creates or modifies resources in FreeCAD MCP by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

freecad_gui Rate-limited

freecad_gui 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": {
    "freecad_gui": {
      "limits": [
        {
          "counter": "freecad_gui_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 FreeCAD MCP, so you can run agents against it safely.

FAQ

Questions about freecad_gui

What does the freecad_gui tool do? +

freecad_gui. It is categorised as a Write tool in the FreeCAD MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on freecad_gui? +

Register the FreeCAD MCP server in PolicyLayer and add a rule for freecad_gui: 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 MCP. Nothing to install.

What risk level is freecad_gui? +

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

Can I rate-limit freecad_gui? +

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

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

freecad_gui is provided by the FreeCAD MCP server (sandraschi/freecad-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.