Create a loft (transition shape) between multiple profiles. This is the Part workbench version of loft, working directly on wires/faces rather than PartDesign sketches. Args: profile_names: List of wire/face object names to loft through (in order). solid: Whether to create a solid (True) or shell...
AI agents use part_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.
part_loft creates and modifies FreeCAD model data by generating new loft geometry objects based on input profiles. This is a reversible creation/modification action typical of Write category tools. While it could theoretically be used to create unwanted geometry, the blast radius is limited to the current FreeCAD document and does not affect system integrity, external data, or have destructive/financial implications.
From the tool's definition Tool creates new 3D geometry objects through lofting operation: 'Create a loft (transition shape) between multiple profiles' with parameters to control output solid/shell properties and naming, but does not retrieve data (Read), execute arbitrary code…
Documented attack patterns abuse exactly the kind of access part_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 part_loft:
{
"version": "1",
"default": "deny",
"tools": {
"part_loft": {
"limits": [
{
"counter": "part_loft_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}part_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 loft (transition shape) between multiple profiles. This is the Part workbench version of loft, working directly on wires/faces rather than PartDesign sketches. Args: profile_names: List of wire/face object names to loft through (in order). solid: Whether to create a solid (True) or shell (False). Defaults to True. ruled: Whether to create ruled surfaces. Defaults to False. closed: Whether to close the loft (connect last to first). Defaults to False. result_name: Name for result object. Auto-generated if None. doc_name: Document containing the profiles. 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 part_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.
part_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 part_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 part_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.
part_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.