rhino_flow

Flow objects from one curve onto another (bridge only).

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-flow.md

WHAT IT DOES

What rhino_flow does on Rhino

AI agents use rhino_flow 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_flow is rated Medium

This tool performs a geometric transformation operation that creates or modifies data (object placement/deformation) in the Rhino model. It is reversible (can be undone in Rhino's undo system), so it qualifies as Write rather than Destructive. The 'bridge only' constraint limits its scope.

From the tool's definition Tool description states it 'Flow objects from one curve onto another', which modifies geometry by transforming and repositioning objects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs rhino_flow 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_flow, this is the rule to start with:

rhino_flow Rate-limited

rhino_flow 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_flow": {
      "limits": [
        {
          "counter": "rhino_flow_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_flow call is checked against it from then on.

FAQ

Questions about rhino_flow

What does the rhino_flow tool do? +

Flow objects from one curve onto another (bridge only). 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_flow? +

Register the Rhino MCP server in PolicyLayer and add a rule for rhino_flow: 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_flow? +

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

Can I rate-limit rhino_flow? +

Yes. Add a rate_limit block to the rhino_flow 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_flow completely? +

Set action: deny in the PolicyLayer policy for rhino_flow. 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_flow? +

rhino_flow 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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