Combine multiple shapes into a single compound. A compound is a collection of shapes that can be manipulated together but are not fused (each shape remains separate). Args: object_names: List of object names to combine. result_name: Name for result object. Auto-generated if None. doc_name: Docume...
AI agents use make_compound 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 a new object (compound) in the FreeCAD document by combining existing shapes. It is a reversible write/create operation — it does not delete or overwrite existing shapes, does not execute arbitrary code, and has no financial implications. Misuse could clutter a document but is easily undone.
From the tool's definition Combine multiple shapes into a single compound... A compound is a collection of shapes that can be manipulated together
Documented attack patterns abuse exactly the kind of access make_compound 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 make_compound:
{
"version": "1",
"default": "deny",
"tools": {
"make_compound": {
"limits": [
{
"counter": "make_compound_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}make_compound 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.
Combine multiple shapes into a single compound. A compound is a collection of shapes that can be manipulated together but are not fused (each shape remains separate). Args: object_names: List of object names to combine. result_name: Name for result object. Auto-generated if None. doc_name: Document containing the objects. Uses active document if None. Returns: Dictionary with result object information: - name: Result object name - label: Result object label - type_id: Result object type - shape_count: Number of shapes in compound. 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 make_compound: 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.
make_compound 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 make_compound 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 make_compound. 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.
make_compound 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.