rhino_spiral

Add a tapered spiral sampled into a NURBS curve.

SERVERRhino SOURCEeasehee/rhino-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/easehee-rhino-mcp/rhino-spiral.md

WHAT IT DOES

What rhino_spiral does on Rhino

AI agents use rhino_spiral 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.

RISK

Why rhino_spiral is rated Medium

This tool creates new geometric data (a NURBS curve spiral) within Rhino's model space, which is a reversible write operation. While it modifies the design state, it does not execute arbitrary commands, delete data, or trigger external financial operations.

From the tool's definition Tool adds a tapered spiral sampled into a NURBS curve, which creates new geometry in Rhino. The verb 'add' indicates creation of a new design element within the CAD model.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs rhino_spiral 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_spiral, this is the rule to start with:

rhino_spiral Rate-limited

rhino_spiral 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "rhino_spiral": {
      "limits": [
        {
          "counter": "rhino_spiral_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Rhino, apply this rule, and every rhino_spiral call is checked against it from then on.

FAQ

Questions about rhino_spiral

What does the rhino_spiral tool do? +

Add a tapered spiral sampled into a NURBS curve. 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.

How do I enforce a policy on rhino_spiral? +

Register the Rhino MCP server in PolicyLayer and add a rule for rhino_spiral: 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.

What risk level is rhino_spiral? +

rhino_spiral is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit rhino_spiral? +

Yes. Add a rate_limit block to the rhino_spiral 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.

How do I block rhino_spiral completely? +

Set action: deny in the PolicyLayer policy for rhino_spiral. 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.

What MCP server provides rhino_spiral? +

rhino_spiral 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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