create_category

Create a category in the given scope via WS config/category_registry/create.

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-category.md

WHAT IT DOES

What create_category does on Ha Nexus Agent

AI agents use create_category 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_category is rated Medium

This tool creates a new category within Home Assistant's configuration registry. Creation of data is classified as Write rather than Read (which only retrieves) or Destructive (which cannot be undone). The severity is medium because misconfigured categories could cause organizational confusion in the smart home system, but this is unlikely to cause critical failures.

From the tool's definition Tool name 'create_category' and description 'Create a category in the given scope via WS config/category_registry/create' indicate creation of new configuration data. The action is reversible (categories can be deleted or modified).

Attacks that exploit this kind of access

RECOMMENDED RULE

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

create_category Rate-limited

create_category 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_category": {
      "limits": [
        {
          "counter": "create_category_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_category call is checked against it from then on.

FAQ

Questions about create_category

What does the create_category tool do? +

Create a category in the given scope via WS config/category_registry/create. 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_category? +

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

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

Can I rate-limit create_category? +

Yes. Add a rate_limit block to the create_category 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_category completely? +

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

create_category 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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