rhino_block_define

A write tool on the Rhino MCP server.

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-block-define.md

WHAT IT DOES

What rhino_block_define does on Rhino

AI agents use rhino_block_define 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_block_define is rated Medium

Block definition in Rhino creates reusable geometry objects that persist in the model, constituting a write operation (reversible creation/modification of data). Severity is medium because misuse could clutter or corrupt a Rhino document, but blocks can be deleted and the operation doesn't permanently destroy data or execute arbitrary code.

From the tool's definition Tool name 'rhino_block_define' indicates creation or definition of blocks in Rhino 3D, a modeling operation that modifies the document state.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs rhino_block_define 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_block_define, this is the rule to start with:

rhino_block_define Rate-limited

rhino_block_define 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_block_define": {
      "limits": [
        {
          "counter": "rhino_block_define_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_block_define call is checked against it from then on.

FAQ

Questions about rhino_block_define

What does the rhino_block_define tool do? +

rhino_block_define is a write tool on the Rhino MCP server. 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_block_define? +

Register the Rhino MCP server in PolicyLayer and add a rule for rhino_block_define: 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_block_define? +

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

Can I rate-limit rhino_block_define? +

Yes. Add a rate_limit block to the rhino_block_define 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_block_define completely? +

Set action: deny in the PolicyLayer policy for rhino_block_define. 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_block_define? +

rhino_block_define 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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