create_nurbs_curve

A write tool on the Aos MCP server.

SERVERAos SOURCE@hybridlabor-api/aos

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/hybridlabor-api-aos/create-nurbs-curve.md

WHAT IT DOES

What create_nurbs_curve does on Aos

AI agents use create_nurbs_curve to create or update resources in Aos, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Aos environment.

RISK

Why create_nurbs_curve is rated Medium

Creating NURBS curves is a reversible write operation that modifies the Rhino document by adding new geometry. It does not execute arbitrary code, delete data, or produce financial effects. While the server permits arbitrary Python execution (Execute-class capability), this specific tool is narrowly scoped to geometry creation.

From the tool's definition Tool name 'create_nurbs_curve' indicates creation of geometric data (NURBS curves) in Rhino 8. Server description confirms it provides 'direct, programmatic control of Rhino 8 — create geometry'. The tool description is empty, preventing higher certainty.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs create_nurbs_curve safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Aos, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For create_nurbs_curve, this is the rule to start with:

create_nurbs_curve Rate-limited

create_nurbs_curve 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": {
    "create_nurbs_curve": {
      "limits": [
        {
          "counter": "create_nurbs_curve_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 Aos, apply this rule, and every create_nurbs_curve call is checked against it from then on.

FAQ

Questions about create_nurbs_curve

What does the create_nurbs_curve tool do? +

create_nurbs_curve is a write tool on the Aos MCP server. It is categorised as a Write tool in the Aos MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_nurbs_curve? +

Register the Aos MCP server in PolicyLayer and add a rule for create_nurbs_curve: 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 Aos. Nothing to install.

What risk level is create_nurbs_curve? +

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

Can I rate-limit create_nurbs_curve? +

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

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

create_nurbs_curve is provided by the Aos MCP server (@hybridlabor-api/aos). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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