run_fem_analysis · FreeCAD MCP: Risk & Policy

WHAT IT DOES

What run_fem_analysis does on FreeCAD MCP

AI agents invoke run_fem_analysis 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 run_fem_analysis needs a policy

FEM (finite element method) analysis is a computational operation that simulates physical behavior of structures. While not destructive by itself, it executes external simulations whose outcomes depend on user-supplied arguments. This fits Execute rather than Read (it doesn't just retrieve existing data) or Write (it's primarily computational rather than data modification, though results may be stored).

From the tool's definition Tool name 'run_fem_analysis' indicates execution of finite element method (structural analysis) simulation. Description is empty, but context from server description states the server enables 'structural analysis' operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

run_fem_analysis Rate-limited

run_fem_analysis 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": {
    "run_fem_analysis": {
      "limits": [
        {
          "counter": "run_fem_analysis_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 run_fem_analysis

What does the run_fem_analysis tool do? +

run_fem_analysis. 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 run_fem_analysis? +

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

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

Can I rate-limit run_fem_analysis? +

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

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

run_fem_analysis 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.