gh_add_component

Drop a Grasshopper component onto the active canvas.

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/gh-add-component.md

WHAT IT DOES

What gh_add_component does on Rhino

AI agents use gh_add_component 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 gh_add_component is rated Medium

This tool creates/adds a new component to the Grasshopper canvas, which is a write operation (creating data/objects). It modifies the canvas state but is reversible (the component can be removed). Misuse could clutter or corrupt a design canvas but has no destructive or financial implications.

From the tool's definition Drop a Grasshopper component onto the active canvas

Attacks that exploit this kind of access

RECOMMENDED RULE

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

gh_add_component Rate-limited

gh_add_component 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": {
    "gh_add_component": {
      "limits": [
        {
          "counter": "gh_add_component_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 gh_add_component call is checked against it from then on.

FAQ

Questions about gh_add_component

What does the gh_add_component tool do? +

Drop a Grasshopper component onto the active canvas. 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 gh_add_component? +

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

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

Can I rate-limit gh_add_component? +

Yes. Add a rate_limit block to the gh_add_component 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 gh_add_component completely? +

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

gh_add_component 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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