Extrude a wire or face along a direction vector. Args: object_name: Name of the wire or face object to extrude. direction: Extrusion direction and length as [x, y, z]. result_name: Name for result object. Auto-generated if None. doc_name: Document containing the object. Uses active document if No...
AI agents use extrude_shape 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 modeling geometry reversibly within FreeCAD. It modifies the document state by adding a new extruded shape object, which is the essence of a Write operation. While it has side effects (adding to the document), these are reversible through undo/standard CAD operations and do not permanently destroy data or execute arbitrary code.
From the tool's definition Tool 'extrude_shape' creates a new 3D object by extruding a wire or face, returning a new result object with name, label, and type.
Documented attack patterns abuse exactly the kind of access extrude_shape 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 extrude_shape:
{
"version": "1",
"default": "deny",
"tools": {
"extrude_shape": {
"limits": [
{
"counter": "extrude_shape_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}extrude_shape 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.
Extrude a wire or face along a direction vector. Args: object_name: Name of the wire or face object to extrude. direction: Extrusion direction and length as [x, y, z]. result_name: Name for result object. Auto-generated if None. doc_name: Document containing the object. Uses active document if None. Returns: Dictionary with result object information: - name: Result object name - label: Result object label - type_id: Result 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 extrude_shape: 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.
extrude_shape 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 extrude_shape 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 extrude_shape. 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.
extrude_shape 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.