Create a Part Sphere primitive. Args: radius: Sphere radius. Defaults to 5.0. name: Object name. Auto-generated if None. doc_name: Target document. Uses active document if None. Returns: Dictionary with created object information: - name: Object name - label: Object label - type_id: Object type
AI agents use create_sphere to create or update resources in FreeCAD Robust MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your FreeCAD Robust MCP Server environment.
The tool creates new geometry (a sphere primitive) in a FreeCAD document, which is a reversible modification. It does not execute arbitrary code, delete data, or cause financial transactions. It falls squarely into the Write category as it creates a new object with specified parameters.
From the tool's definition Tool creates a Part Sphere primitive in FreeCAD, which adds a new 3D object to the document. The description explicitly states 'Create' and returns information about the 'created object'. This is a reversible data creation operation typical of CAD modeling.
Documented attack patterns abuse exactly the kind of access create_sphere gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and FreeCAD Robust MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for create_sphere:
{
"version": "1",
"default": "deny",
"tools": {
"create_sphere": {
"limits": [
{
"counter": "create_sphere_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_sphere 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 Part Sphere primitive. Args: radius: Sphere radius. Defaults to 5.0. name: Object name. Auto-generated if None. doc_name: Target document. Uses active document if None. Returns: Dictionary with created object information: - name: Object name - label: Object label - type_id: Object type. It is categorised as a Write tool in the FreeCAD Robust MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the FreeCAD Robust MCP Server MCP server in PolicyLayer and add a rule for create_sphere: 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 Robust MCP Server. Nothing to install.
create_sphere 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_sphere 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_sphere. 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_sphere is provided by the FreeCAD Robust MCP Server MCP server (spkane/freecad-addon-robust-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 152 FreeCAD Robust MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
152 FreeCAD Robust MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.