create_area

Create a new area.

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-area.md

WHAT IT DOES

What create_area does on Ha Nexus Agent

AI agents use create_area 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_area is rated Medium

This tool creates a new organizational entity (area) in Home Assistant, which is a reversible write operation. Areas are logical groupings that can be deleted or modified. While it modifies the smart home configuration, the impact is limited in scope (creating metadata, not triggering physical actions or destructive changes) and can be easily undone.

From the tool's definition Tool name 'create_area' and description 'Create a new area' indicate a data creation operation. The context of Home Assistant areas (logical groupings of devices/entities) confirms this is reversible configuration data creation.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

create_area Rate-limited

create_area 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_area": {
      "limits": [
        {
          "counter": "create_area_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_area call is checked against it from then on.

FAQ

Questions about create_area

What does the create_area tool do? +

Create a new area. 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_area? +

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

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

Can I rate-limit create_area? +

Yes. Add a rate_limit block to the create_area 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_area completely? +

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

create_area 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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