Create a Part Ellipse curve. Args: major_radius: Semi-major axis radius. Defaults to 10.0. minor_radius: Semi-minor axis radius. Defaults to 5.0. angle1: Start angle in degrees. Defaults to 0. angle2: End angle in degrees. Defaults to 360. name: Object name. Auto-generated if None. doc_name: Targ...
AI agents use create_ellipse 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.
This tool creates new geometric objects in FreeCAD (Write category) but the operation is reversible and non-destructive. The severity is low because ellipse creation in a CAD context has minimal blast radius—it adds geometry that can be easily deleted or undone. It does not execute arbitrary code, delete data, modify financial records, or trigger external operations beyond the controlled FreeCAD modeling environment.
From the tool's definition Tool creates a Part Ellipse curve with configurable parameters (major_radius, minor_radius, angle1, angle2, name, doc_name) and returns created object information.
Documented attack patterns abuse exactly the kind of access create_ellipse 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_ellipse:
{
"version": "1",
"default": "deny",
"tools": {
"create_ellipse": {
"limits": [
{
"counter": "create_ellipse_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_ellipse 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.
Free to start. No card required.
Create a Part Ellipse curve. Args: major_radius: Semi-major axis radius. Defaults to 10.0. minor_radius: Semi-minor axis radius. Defaults to 5.0. angle1: Start angle in degrees. Defaults to 0. angle2: End angle in degrees. Defaults to 360. 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_ellipse: 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_ellipse 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_ellipse 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_ellipse. 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_ellipse 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.