set_light_color

Set light color, color temperature and/or brightness.

SERVERHa Nexus Agent SOURCEfistacho/ha-nexus-agent

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/fistacho-ha-nexus-agent/set-light-color.md

WHAT IT DOES

What set_light_color does on Ha Nexus Agent

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

RISK

Why set_light_color is rated Medium

This tool modifies the state of a smart home light (color, temperature, brightness). It is a reversible write operation — the light can be changed back at any time. No data is deleted, no code is executed, and no financial transaction occurs. Misuse is low severity as it only affects lighting.

From the tool's definition Set light color, color temperature and/or brightness

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs set_light_color safely

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

set_light_color Rate-limited

set_light_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_light_color": {
      "limits": [
        {
          "counter": "set_light_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 Ha Nexus Agent, apply this rule, and every set_light_color call is checked against it from then on.

FAQ

Questions about set_light_color

What does the set_light_color tool do? +

Set light color, color temperature and/or brightness. It is categorised as a Write tool in the Ha Nexus Agent 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_light_color? +

Register the Ha Nexus Agent MCP server in PolicyLayer and add a rule for set_light_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 Ha Nexus Agent. Nothing to install.

What risk level is set_light_color? +

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

Can I rate-limit set_light_color? +

Yes. Add a rate_limit block to the set_light_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_light_color completely? +

Set action: deny in the PolicyLayer policy for set_light_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_light_color? +

set_light_color is provided by the Ha Nexus Agent MCP server (fistacho/ha-nexus-agent). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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