rhino_circle

Add a circle by centre and radius (optionally on a custom plane).

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-circle.md

WHAT IT DOES

What rhino_circle does on Rhino

AI agents use rhino_circle 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_circle is rated Medium

This tool creates new geometry (a circle) in the Rhino model, which is a reversible write operation. It modifies the document state by adding a new object. The severity is medium because unintended circle creation could clutter a model but can be easily undone (undo functionality in CAD software). It does not execute arbitrary code, delete data irreversibly, or involve financial transactions.

From the tool's definition Tool description states 'Add a circle' which creates geometric data in Rhino. The verb 'add' indicates data creation/modification rather than retrieval or deletion.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs rhino_circle 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_circle, this is the rule to start with:

rhino_circle Rate-limited

rhino_circle 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_circle": {
      "limits": [
        {
          "counter": "rhino_circle_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_circle call is checked against it from then on.

FAQ

Questions about rhino_circle

What does the rhino_circle tool do? +

Add a circle by centre and radius (optionally on a custom plane). 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_circle? +

Register the Rhino MCP server in PolicyLayer and add a rule for rhino_circle: 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_circle? +

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

Can I rate-limit rhino_circle? +

Yes. Add a rate_limit block to the rhino_circle 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_circle completely? +

Set action: deny in the PolicyLayer policy for rhino_circle. 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_circle? +

rhino_circle 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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