cfd_nl2foam · FreeCAD MCP: Risk & Policy

WHAT IT DOES

What cfd_nl2foam does on FreeCAD MCP

AI agents invoke cfd_nl2foam to trigger actions in FreeCAD MCP. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why cfd_nl2foam needs a policy

Based on the server context (fluid simulation capabilities) and the tool name pattern 'nl2foam' (natural language to OpenFOAM), this tool likely executes CFD simulation setup or conversion operations. Given sibling tool 'cfd_build_case', this probably generates or executes OpenFOAM configuration from natural language input. Empty description lowers confidence significantly.

From the tool's definition Tool name 'cfd_nl2foam' suggests CFD (Computational Fluid Dynamics) operations, likely converting natural language descriptions to OpenFOAM simulation cases. Description is empty and uninformative.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

cfd_nl2foam Rate-limited

cfd_nl2foam stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "cfd_nl2foam": {
      "limits": [
        {
          "counter": "cfd_nl2foam_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-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 cfd_nl2foam

What does the cfd_nl2foam tool do? +

cfd_nl2foam. It is categorised as a Execute tool in the FreeCAD MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on cfd_nl2foam? +

Register the FreeCAD MCP server in PolicyLayer and add a rule for cfd_nl2foam: 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 cfd_nl2foam? +

cfd_nl2foam is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit cfd_nl2foam? +

Yes. Add a rate_limit block to the cfd_nl2foam 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 cfd_nl2foam completely? +

Set action: deny in the PolicyLayer policy for cfd_nl2foam. 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 cfd_nl2foam? +

cfd_nl2foam 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.