Create a subtractive loft (cut) through multiple sketches. Args: sketch_names: List of sketch names to loft through (in order). ruled: Whether to create ruled surfaces. Defaults to False. closed: Whether to close the loft. Defaults to False. name: Loft feature name. Auto-generated if None. doc_na...
AI agents use subtractive_loft 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 a new 3D modeling feature (subtractive loft/cut) in a FreeCAD document. While 'subtractive' implies removing material, this is a parametric modeling operation that creates a reversible feature in the CAD document (features can be deleted or modified), making it a Write operation rather than Destructive.
From the tool's definition Create a subtractive loft (cut) through multiple sketches
Documented attack patterns abuse exactly the kind of access subtractive_loft 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 subtractive_loft:
{
"version": "1",
"default": "deny",
"tools": {
"subtractive_loft": {
"limits": [
{
"counter": "subtractive_loft_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}subtractive_loft 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 subtractive loft (cut) through multiple sketches. Args: sketch_names: List of sketch names to loft through (in order). ruled: Whether to create ruled surfaces. Defaults to False. closed: Whether to close the loft. Defaults to False. name: Loft feature name. Auto-generated if None. doc_name: Document containing the sketches. Uses active document if None. Returns: Dictionary with created loft information: - name: Loft name - label: Loft 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 subtractive_loft: 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.
subtractive_loft 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 subtractive_loft 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 subtractive_loft. 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.
subtractive_loft 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.