edit_object · FreeCAD MCP: Risk & Policy

WHAT IT DOES

What edit_object does on FreeCAD MCP

AI agents use edit_object 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 edit_object needs a policy

The tool modifies existing 3D objects reversibly without deletion. While the empty description prevents full certainty, the name and server purpose (editing objects) clearly indicate Write operations. Severity is medium due to potential for creating malformed designs or corrupting project files through improper edits, but changes are typically undoable in FreeCAD.

From the tool's definition Tool name 'edit_object' combined with server context describing 'editing...3D objects' indicates modification capability. Description is empty, lowering confidence slightly.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

edit_object Rate-limited

edit_object 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": {
    "edit_object": {
      "limits": [
        {
          "counter": "edit_object_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 edit_object

What does the edit_object tool do? +

edit_object. 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 edit_object? +

Register the FreeCAD MCP server in PolicyLayer and add a rule for edit_object: 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 edit_object? +

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

Can I rate-limit edit_object? +

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

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

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