Create a datum point in a PartDesign body. Datum points are reference points used for measurements or construction. Args: body_name: Name of the PartDesign body. position: Point position [x, y, z]. Uses origin if None. name: Datum point name. Auto-generated if None. doc_name: Document containing ...
AI agents use create_datum_point 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 new geometry objects (datum points) which are design elements that can be modified or deleted later. This is a reversible write operation typical of CAD modeling—it adds data to the design without permanently destroying anything. The operation has minimal blast radius as datum points are auxiliary reference geometry used for measurements and construction, not critical model features.
From the tool's definition Tool creates a datum point in a PartDesign body with parameters for position, name, and document. The description explicitly states 'Create a datum point' and returns creation metadata including name, label, and type_id.
Documented attack patterns abuse exactly the kind of access create_datum_point 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 create_datum_point:
{
"version": "1",
"default": "deny",
"tools": {
"create_datum_point": {
"limits": [
{
"counter": "create_datum_point_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_datum_point 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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Create a datum point in a PartDesign body. Datum points are reference points used for measurements or construction. Args: body_name: Name of the PartDesign body. position: Point position [x, y, z]. Uses origin if None. name: Datum point name. Auto-generated if None. doc_name: Document containing the body. Uses active document if None. Returns: Dictionary with created datum information: - name: Datum name - label: Datum label - type_id: Object 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 create_datum_point: 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.
create_datum_point 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 create_datum_point 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 create_datum_point. 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.
create_datum_point 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.