create_css_custom_property

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/create-css-custom-property.md

WHAT IT DOES

What create_css_custom_property does on Ha Nexus Agent

AI agents use create_css_custom_property 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 create_css_custom_property is rated Medium

This tool creates or registers a new CSS custom property, which is a reversible modification of CSS styling configuration. It does not execute code, delete data, or affect critical smart home operations. The impact is limited to visual/styling customization of the Home Assistant UI, making it a Write operation with low severity.

From the tool's definition Tool name 'create_css_custom_property' and description 'Register a CSS custom property' indicate creation of a new CSS configuration element.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

create_css_custom_property Rate-limited

create_css_custom_property 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_css_custom_property": {
      "limits": [
        {
          "counter": "create_css_custom_property_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 create_css_custom_property call is checked against it from then on.

FAQ

Questions about create_css_custom_property

What does the create_css_custom_property tool do? +

Register a CSS custom property. syntax is e.g. "<color>" or "<length>". 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 create_css_custom_property? +

Register the Ha Nexus Agent MCP server in PolicyLayer and add a rule for create_css_custom_property: 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 create_css_custom_property? +

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

Can I rate-limit create_css_custom_property? +

Yes. Add a rate_limit block to the create_css_custom_property 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_css_custom_property completely? +

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

create_css_custom_property 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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