cfd_set_boundary · FreeCAD MCP: Risk & Policy

WHAT IT DOES

What cfd_set_boundary does on FreeCAD MCP

AI agents use cfd_set_boundary 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 cfd_set_boundary needs a policy

The description is empty, so classification relies solely on the tool name. 'cfd_set_boundary' implies configuring boundary conditions for a fluid simulation case, which is a write/configuration operation. Given the server context includes 'fluid simulation', this tool likely modifies simulation parameters. Confidence is low due to the empty description.

From the tool's definition Tool name 'cfd_set_boundary' suggests setting boundary conditions for CFD (Computational Fluid Dynamics) simulation, likely a configuration/write operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

cfd_set_boundary Rate-limited

cfd_set_boundary 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": {
    "cfd_set_boundary": {
      "limits": [
        {
          "counter": "cfd_set_boundary_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 cfd_set_boundary

What does the cfd_set_boundary tool do? +

cfd_set_boundary. 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 cfd_set_boundary? +

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

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

Can I rate-limit cfd_set_boundary? +

Yes. Add a rate_limit block to the cfd_set_boundary 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_set_boundary completely? +

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

cfd_set_boundary 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.