Convert an extrusion or SubD object to a NURBS brep.
AI agents use convert_to_nurbs to create or update resources in GOLEM-3DMCP-Rhino- — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your GOLEM-3DMCP-Rhino- environment.
This tool performs a reversible geometric transformation. While it modifies object data (changing from extrusion/SubD to NURBS representation), the operation is not destructive—the original geometric intent is preserved and can be converted back. This qualifies as Write rather than Destructive.
From the tool's definition Tool description states it converts geometry objects to NURBS format, which modifies the representation of existing 3D objects in Rhino.
Documented attack patterns abuse exactly the kind of access convert_to_nurbs gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and GOLEM-3DMCP-Rhino-, and nothing reaches the server without passing your rules. This is the rule we recommend for convert_to_nurbs:
{
"version": "1",
"default": "deny",
"tools": {
"convert_to_nurbs": {
"limits": [
{
"counter": "convert_to_nurbs_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}convert_to_nurbs 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.
Convert an extrusion or SubD object to a NURBS brep. It is categorised as a Write tool in the GOLEM-3DMCP-Rhino- MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the GOLEM-3DMCP-Rhino- MCP server in PolicyLayer and add a rule for convert_to_nurbs: 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 GOLEM-3DMCP-Rhino-. Nothing to install.
convert_to_nurbs 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 convert_to_nurbs 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 convert_to_nurbs. 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.
convert_to_nurbs is provided by the GOLEM-3DMCP-Rhino- MCP server (thekinghippopotamus/golem-3dmcp-rhino-). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from GOLEM-3DMCP-Rhino-, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
89 GOLEM-3DMCP-Rhino- tools catalogued and risk-classified — across an index of 43,000+ MCP servers.