set_background_color

Set the background colour of a Rhino viewport.

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/set-background-color.md

WHAT IT DOES

What set_background_color does on Aos

AI agents use set_background_color 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 set_background_color is rated Medium

This tool modifies a viewport's visual property (background color), which is a reversible write operation. It does not execute arbitrary code, delete data, or have financial impact. The change can be easily undone by setting a different color.

From the tool's definition Tool name is 'set_background_color' and description states it 'Set the background colour of a Rhino viewport.' This modifies viewport properties, which are reversible settings within the Rhino application.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

set_background_color Rate-limited

set_background_color 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": {
    "set_background_color": {
      "limits": [
        {
          "counter": "set_background_color_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 set_background_color call is checked against it from then on.

FAQ

Questions about set_background_color

What does the set_background_color tool do? +

Set the background colour of a Rhino viewport. 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 set_background_color? +

Register the Aos MCP server in PolicyLayer and add a rule for set_background_color: 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 set_background_color? +

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

Can I rate-limit set_background_color? +

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

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

set_background_color 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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