rhino_evaluate_surface
Evaluate a surface at UV parameters to get 3D point, normal, and tangents.
This record as markdown: /tools/easehee-rhino-mcp/rhino-evaluate-surface.md
What rhino_evaluate_surface does on Rhino
AI agents call rhino_evaluate_surface to retrieve information from Rhino without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why rhino_evaluate_surface is rated Low
This tool performs read-only evaluation of surface geometry. It queries properties (point, normal, tangents) at specified UV coordinates but does not create, modify, delete, or execute arbitrary operations. The operation is deterministic, has no side effects, and presents minimal risk if misused by an agent.
From the tool's definition Tool description states it 'evaluate[s] a surface at UV parameters to get 3D point, normal, and tangents' — a pure query operation that retrieves geometric properties without modifying or creating data.
Attacks that exploit this kind of access
The rule that runs rhino_evaluate_surface 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_evaluate_surface, this is the rule to start with:
rhino_evaluate_surface is read-only, so it stays allowed. 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_evaluate_surface call is checked against it from then on.
Questions about rhino_evaluate_surface
Evaluate a surface at UV parameters to get 3D point, normal, and tangents. It is categorised as a Read tool in the Rhino MCP Server, which means it retrieves data without modifying state.
Register the Rhino MCP server in PolicyLayer and add a rule for rhino_evaluate_surface: 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_evaluate_surface is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the rhino_evaluate_surface 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_evaluate_surface. 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_evaluate_surface 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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