Import an STL file into FreeCAD. Args: file_path: Path to the .stl file to import. doc_name: Document to import into. Creates new if None. Returns: Dictionary with import result: - success: Whether import was successful - document: Name of document containing imported object - object: Name of imp...
AI agents use import_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.
This tool creates or modifies FreeCAD documents by importing external mesh data, which constitutes a Write operation. While it reads an external file, the primary effect is to create new data structures (imported mesh object) within a FreeCAD document.
From the tool's definition Tool description states 'Import an STL file into FreeCAD' and accepts file_path and doc_name parameters. The return values indicate it creates or modifies a FreeCAD document by adding an imported mesh object.
Documented attack patterns abuse exactly the kind of access import_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 import_stl:
{
"version": "1",
"default": "deny",
"tools": {
"import_stl": {
"limits": [
{
"counter": "import_stl_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}import_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.
Free to start. No card required.
Import an STL file into FreeCAD. Args: file_path: Path to the .stl file to import. doc_name: Document to import into. Creates new if None. Returns: Dictionary with import result: - success: Whether import was successful - document: Name of document containing imported object - object: Name of imported mesh object. 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 import_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.
import_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 import_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 import_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.
import_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.