Export objects to 3MF format. 3MF (3D Manufacturing Format) is a modern 3D printing format that supports richer data than STL, including colors, materials, and print settings. It is increasingly preferred over STL for 3D printing. Args: file_path: Path for the output .3mf file. object_names: List...
AI agents use export_3mf 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 and writes a new 3D model file in 3MF format to the specified file path. It does not delete, destroy, or irreversibly modify existing data—it creates a new export artifact. While the operation modifies the file system by adding a file, this is a reversible Write action (the file can be deleted or recreated). The blast radius of misuse is limited to creating unwanted output files.
From the tool's definition Tool creates/exports objects to a 3MF file format. Description states 'Export objects to 3MF format' with a file_path output parameter, which creates a new file on disk.
Documented attack patterns abuse exactly the kind of access export_3mf 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 export_3mf:
{
"version": "1",
"default": "deny",
"tools": {
"export_3mf": {
"limits": [
{
"counter": "export_3mf_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}export_3mf 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.
Export objects to 3MF format. 3MF (3D Manufacturing Format) is a modern 3D printing format that supports richer data than STL, including colors, materials, and print settings. It is increasingly preferred over STL for 3D printing. Args: file_path: Path for the output .3mf file. object_names: List of object names to export. Exports all visible if None. doc_name: Document to export from. Uses active document if None. mesh_tolerance: Mesh approximation tolerance. Lower = finer mesh. Returns: Dictionary with export result: - success: Whether export was successful - path: Path to exported file - object_count: Number of objects exported. 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 export_3mf: 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.
export_3mf 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 export_3mf 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 export_3mf. 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.
export_3mf 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.