Create a Part Helix curve. A helix is a spiral curve, useful as a sweep path for threads and springs. Args: pitch: Distance between turns. Defaults to 5.0. height: Total helix height. Defaults to 20.0. radius: Helix radius. Defaults to 5.0. angle: Taper angle in degrees. Defaults to 0.0. left_han...
AI agents use create_helix 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 and adds new 3D geometry (a helix curve) to a FreeCAD document. It modifies the document state by inserting a new object, which is a reversible Write operation. While it doesn't delete or execute arbitrary code, it does persist data changes to the model.
From the tool's definition create_helix creates a Part Helix curve object with parameters like pitch, height, radius, and angle. This creates new geometric data in a FreeCAD document.
Documented attack patterns abuse exactly the kind of access create_helix 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_helix:
{
"version": "1",
"default": "deny",
"tools": {
"create_helix": {
"limits": [
{
"counter": "create_helix_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_helix 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 Helix curve. A helix is a spiral curve, useful as a sweep path for threads and springs. Args: pitch: Distance between turns. Defaults to 5.0. height: Total helix height. Defaults to 20.0. radius: Helix radius. Defaults to 5.0. angle: Taper angle in degrees. Defaults to 0.0. left_handed: Whether helix is left-handed. Defaults to False. 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_helix: 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_helix 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_helix 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_helix. 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_helix 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.