bim_export_ifc · FreeCAD MCP: Risk & Policy

WHAT IT DOES

What bim_export_ifc does on FreeCAD MCP

AI agents use bim_export_ifc 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 bim_export_ifc needs a policy

Export operations create new files or data artifacts, making this a Write category tool rather than Read (which would only retrieve/query). It is not Destructive because export does not delete or overwrite existing models irreversibly. It is not Execute because it does not run arbitrary code or trigger unpredictable external operations—it performs a deterministic format conversion.

From the tool's definition Tool name 'bim_export_ifc' indicates it exports Building Information Model data to IFC (Industry Foundation Classes) format. IFC export is a write operation that creates or generates output files.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

bim_export_ifc Rate-limited

bim_export_ifc 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": {
    "bim_export_ifc": {
      "limits": [
        {
          "counter": "bim_export_ifc_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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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 bim_export_ifc

What does the bim_export_ifc tool do? +

bim_export_ifc. 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 bim_export_ifc? +

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

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

Can I rate-limit bim_export_ifc? +

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

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

bim_export_ifc 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.