update_zone

Update a zone via WS config/zone/update; only the fields you pass are sent.

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/update-zone.md

WHAT IT DOES

What update_zone does on Ha Nexus Agent

AI agents use update_zone 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 update_zone is rated Medium

This tool creates or modifies zone configuration data in Home Assistant. While zones are not typically deleted (making it Write rather than Destructive), updating zone configurations in a smart home system can have significant functional impact on automation rules, device grouping, and location-based triggers.

From the tool's definition Tool description states "Update a zone via WS `config/zone/update`; only the fields you pass are sent." The 'update' action on configuration zones is a reversible modification of smart home zone settings.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

update_zone Rate-limited

update_zone 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": {
    "update_zone": {
      "limits": [
        {
          "counter": "update_zone_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 update_zone call is checked against it from then on.

FAQ

Questions about update_zone

What does the update_zone tool do? +

Update a zone via WS config/zone/update; only the fields you pass are sent. 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 update_zone? +

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

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

Can I rate-limit update_zone? +

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

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

update_zone 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.

KEEP EXPLORING

More on Ha Nexus Agent, and thousands of servers like it.

This server

All 276 Ha Nexus Agent tools →

Across the catalogue

aroflo_create_or_update_record on AroFlo MCP →team_manager_update_budget on Team Manager MCP → The MCP Attack Database →

Guides

Govern customer-ops agents →Argument validation →Scoped token →