gh_set_parameter

Push a value into a component parameter.

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-set-parameter.md

WHAT IT DOES

What gh_set_parameter does on Rhino

AI agents use gh_set_parameter 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_set_parameter is rated Medium

The tool creates or modifies data (parameter values) in a reversible manner typical of Write operations. It does not delete, execute arbitrary code, or trigger financial transactions. While it affects a design system and could have downstream consequences if a user misapplies it to critical parameters, the action is inherently reversible (parameters can be reset or adjusted).

From the tool's definition Tool description states 'Push a value into a component parameter' — this modifies component parameters in Grasshopper, changing data reversibly within the design environment.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

gh_set_parameter Rate-limited

gh_set_parameter 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_set_parameter": {
      "limits": [
        {
          "counter": "gh_set_parameter_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_set_parameter call is checked against it from then on.

FAQ

Questions about gh_set_parameter

What does the gh_set_parameter tool do? +

Push a value into a component parameter. 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_set_parameter? +

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

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

Can I rate-limit gh_set_parameter? +

Yes. Add a rate_limit block to the gh_set_parameter 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_set_parameter completely? +

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

gh_set_parameter 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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