Export objects to STL format. STL (Stereolithography) is commonly used for 3D printing and rapid prototyping. It represents surfaces as triangular meshes. Args: file_path: Path for the output .stl file. object_names: List of object names to export. Exports all visible if None. doc_name: Document ...
AI agents use export_stl 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 tool creates new files on the filesystem (output .stl files) which is a reversible write operation. It does not execute arbitrary code, delete data, or perform financial transactions. While the output could theoretically overwrite existing files depending on file_path arguments, the core function is file generation/creation (Write category).
From the tool's definition Tool creates and writes a new .stl output file to disk with the description stating 'Export objects to STL format' and parameters including 'file_path: Path for the output .stl file.' This is a file creation/write operation.
Documented attack patterns abuse exactly the kind of access export_stl 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_stl:
{
"version": "1",
"default": "deny",
"tools": {
"export_stl": {
"limits": [
{
"counter": "export_stl_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}export_stl 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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Export objects to STL format. STL (Stereolithography) is commonly used for 3D printing and rapid prototyping. It represents surfaces as triangular meshes. Args: file_path: Path for the output .stl 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_stl: 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_stl 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_stl 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_stl. 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_stl 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.