rhino_surface_from_points
Create a NURBS surface from a 2D grid of control points.
This record as markdown: /tools/easehee-rhino-mcp/rhino-surface-from-points.md
What rhino_surface_from_points does on Rhino
AI agents use rhino_surface_from_points to create or update resources in Rhino, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Rhino environment.
Why rhino_surface_from_points is rated Medium
This tool creates new geometry objects (NURBS surfaces) in Rhino, which is a reversible write operation. It does not execute arbitrary code, delete data, or move money. The severity is medium because misuse could create unwanted geometry that clutters the model, but the operation is reversible through undo or deletion. The confidence is high because the description clearly indicates a creation/write action.
From the tool's definition Tool description states it will 'Create a NURBS surface' — a direct creation operation that modifies the Rhino geometry model.
Attacks that exploit this kind of access
The rule that runs rhino_surface_from_points safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Rhino, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For rhino_surface_from_points, this is the rule to start with:
rhino_surface_from_points 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Rhino, apply this rule, and every rhino_surface_from_points call is checked against it from then on.
Questions about rhino_surface_from_points
Create a NURBS surface from a 2D grid of control points. It is categorised as a Write tool in the Rhino MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Rhino MCP server in PolicyLayer and add a rule for rhino_surface_from_points: 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 Rhino. Nothing to install.
rhino_surface_from_points 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 rhino_surface_from_points 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 rhino_surface_from_points. 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.
rhino_surface_from_points is provided by the Rhino MCP server (easehee/rhino-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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