AI agents use create_box to create or update resources in Mcp Freecad — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Freecad environment.
This tool creates a new primitive shape (box/cube) in FreeCAD, which is a reversible write operation. The model can be edited, deleted, or exported. The blast radius is minimal—misuse affects only the active FreeCAD document and can be undone. No code execution, deletion, or financial impact. Similar context tools like create_sphere and create_cylinder confirm this pattern as Write operations.
From the tool's definition Tool name 'create_box' and description 'Create a box/cube primitive in FreeCAD' indicate it creates a new geometric object in the CAD model.
Documented attack patterns abuse exactly the kind of access create_box gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Freecad, and nothing reaches the server without passing your rules. This is the rule we recommend for create_box:
{
"version": "1",
"default": "deny",
"tools": {
"create_box": {
"limits": [
{
"counter": "create_box_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_box 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.
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Create a box/cube primitive in FreeCAD. It is categorised as a Write tool in the Mcp Freecad MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Mcp Freecad MCP server in PolicyLayer and add a rule for create_box: 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 Mcp Freecad. Nothing to install.
create_box is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the create_box 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 create_box. 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.
create_box is provided by the Mcp Freecad MCP server (jango-blockchained/mcp-freecad). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcp Freecad, 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.
34 Mcp Freecad tools catalogued and risk-classified — across an index of 43,000+ MCP servers.