Import a STEP file into FreeCAD. Args: file_path: Path to the .step 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 objects - objects: List of ...
AI agents use import_step 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 is a Write operation because it creates new data structures (document and objects) in FreeCAD through file import. While the import itself is reversible (the document can be closed without saving or deleted later), the tool's primary function is to add persistent objects to a FreeCAD document.
From the tool's definition The tool 'import_step' creates or modifies a FreeCAD document by importing STEP file contents. The description explicitly states it 'Import[s] a STEP file into FreeCAD' and creates a new document if none is specified ('Creates new if None'), resulting in new…
Documented attack patterns abuse exactly the kind of access import_step 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_step:
{
"version": "1",
"default": "deny",
"tools": {
"import_step": {
"limits": [
{
"counter": "import_step_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}import_step 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 a STEP file into FreeCAD. Args: file_path: Path to the .step 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 objects - objects: List of imported object names. 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_step: 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_step 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_step 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_step. 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_step 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.