Insert a part from the parts library into the document. Args: part_path: Path to the part file. name: Name for the inserted part. Auto-generated if None. position: Initial position [x, y, z]. Origin if None. doc_name: Target document. Uses active document if None. Returns: Dictionary with inserte...
AI agents use insert_part_from_library 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 modifies the FreeCAD document by adding a new part object, which is a reversible Write operation. While it creates new geometric content, the action can be undone in FreeCAD (standard CAD undo functionality). The severity is medium because inserting unintended parts could corrupt a design or add unwanted geometry, but the effect is reversible and localized to the target document.
From the tool's definition Tool description states it will 'Insert a part from the parts library into the document' with configurable name, position, and target document. The return value confirms the part is added to the document.
Documented attack patterns abuse exactly the kind of access insert_part_from_library 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 insert_part_from_library:
{
"version": "1",
"default": "deny",
"tools": {
"insert_part_from_library": {
"limits": [
{
"counter": "insert_part_from_library_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}insert_part_from_library 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.
Insert a part from the parts library into the document. Args: part_path: Path to the part file. name: Name for the inserted part. Auto-generated if None. position: Initial position [x, y, z]. Origin if None. doc_name: Target document. Uses active document if None. Returns: Dictionary with inserted part information: - name: Part name - label: Part label - type_id: Part 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 insert_part_from_library: 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.
insert_part_from_library 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 insert_part_from_library 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 insert_part_from_library. 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.
insert_part_from_library 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.