Execute arbitrary Python code in FreeCAD. Args: code: The Python code to execute. Returns: A message indicating the success or failure of the code execution, the output of the code execution, and a screenshot of the object.
AI agents invoke execute_code 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.
This tool allows execution of arbitrary Python code within FreeCAD's runtime environment. Arbitrary code execution is a severe capability that could be exploited to access files, modify data, trigger external operations, or compromise the system.
From the tool's definition Tool name is 'execute_code' and description states 'Execute arbitrary Python code in FreeCAD' with an 'code' parameter that accepts Python code without restrictions.
Documented attack patterns abuse exactly the kind of access execute_code gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Freecad mcp, and nothing reaches the server without passing your rules. This is the rule we recommend for execute_code:
{
"version": "1",
"default": "deny",
"tools": {
"execute_code": {
"limits": [
{
"counter": "execute_code_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}execute_code 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.
Free to start. No card required.
Execute arbitrary Python code in FreeCAD. Args: code: The Python code to execute. Returns: A message indicating the success or failure of the code execution, the output of the code execution, and a screenshot of the object. 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.
Register the Freecad MCP server in PolicyLayer and add a rule for execute_code: 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.
execute_code is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the execute_code 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.
Set action: deny in the PolicyLayer policy for execute_code. 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.
execute_code is provided by the Freecad MCP server (neka-nat/freecad-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Freecad mcp, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
14 Freecad mcp tools catalogued and risk-classified — across an index of 43,000+ MCP servers.