Slice a shape with a plane, returning the cross-section. Args: object_name: Name of the object to slice. plane_point: A point on the cutting plane [x, y, z]. plane_normal: Normal vector of the cutting plane [x, y, z]. result_name: Name for result object. Auto-generated if None. doc_name: Document...
AI agents use slice_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.
The slice_shape tool performs a geometric operation that generates new data (cross-section object) in the FreeCAD model. This is a reversible modification—the result can be deleted or undone—making it Write rather than Destructive. The operation itself is deterministic based on inputs (object, plane definition) and doesn't execute arbitrary code or delete existing objects.
From the tool's definition Tool creates a new result object ('Name for result object') through a slicing operation, modifying the FreeCAD document by adding a cross-section geometry.
Documented attack patterns abuse exactly the kind of access slice_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 slice_shape:
{
"version": "1",
"default": "deny",
"tools": {
"slice_shape": {
"limits": [
{
"counter": "slice_shape_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}slice_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.
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Slice a shape with a plane, returning the cross-section. Args: object_name: Name of the object to slice. plane_point: A point on the cutting plane [x, y, z]. plane_normal: Normal vector of the cutting plane [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 slice_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.
slice_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 slice_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 slice_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.
slice_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.