Create a 3D offset of a shape. Offsets all faces of the shape by the specified distance. Args: object_name: Name of the object to offset. offset: Offset distance (positive = outward, negative = inward). result_name: Name for result object. Auto-generated if None. doc_name: Document containing the...
AI agents use offset_3d 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 generates new geometry and adds it to the FreeCAD model, which is a reversible modification (the result object can be deleted). It does not execute arbitrary code, delete existing data, or trigger external operations with unpredictable side effects. It fits the Write category: creates new data reversibly.
From the tool's definition Tool creates a new 3D offset object ('Create a 3D offset of a shape', 'Name for result object') and returns result object information, modifying the FreeCAD document by adding a new geometric object.
Documented attack patterns abuse exactly the kind of access offset_3d 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 offset_3d:
{
"version": "1",
"default": "deny",
"tools": {
"offset_3d": {
"limits": [
{
"counter": "offset_3d_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}offset_3d 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 3D offset of a shape. Offsets all faces of the shape by the specified distance. Args: object_name: Name of the object to offset. offset: Offset distance (positive = outward, negative = inward). 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 offset_3d: 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.
offset_3d 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 offset_3d 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 offset_3d. 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.
offset_3d 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.