Create a Pad (extrusion) from a sketch. Args: sketch_name: Name of the sketch to pad. length: Pad length (extrusion distance). symmetric: Whether to extrude symmetrically. Defaults to False. reversed: Whether to reverse direction. Defaults to False. name: Pad feature name. Auto-generated if None....
AI agents use pad_sketch 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.
The pad_sketch tool creates and adds a new geometric feature (extrusion) to a FreeCAD model, which is a reversible Write operation. While it modifies the 3D model state, the operation can be undone in FreeCAD and does not permanently delete or destroy data.
From the tool's definition Tool description explicitly states "Create a Pad (extrusion) from a sketch" with parameters for length, symmetric, and reversed extrusion. This creates a new 3D feature in the FreeCAD document.
Documented attack patterns abuse exactly the kind of access pad_sketch 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 pad_sketch:
{
"version": "1",
"default": "deny",
"tools": {
"pad_sketch": {
"limits": [
{
"counter": "pad_sketch_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}pad_sketch 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 Pad (extrusion) from a sketch. Args: sketch_name: Name of the sketch to pad. length: Pad length (extrusion distance). symmetric: Whether to extrude symmetrically. Defaults to False. reversed: Whether to reverse direction. Defaults to False. name: Pad feature name. Auto-generated if None. doc_name: Document containing the sketch. Uses active document if None. Returns: Dictionary with created pad information: - name: Pad name - label: Pad 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 pad_sketch: 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.
pad_sketch 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 pad_sketch 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 pad_sketch. 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.
pad_sketch 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.