send_notification

Send a Home Assistant notification. target = notify service name (default: notify).

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/send-notification.md

WHAT IT DOES

What send_notification does on Ha Nexus Agent

AI agents use send_notification 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 send_notification is rated Medium

This tool sends notifications through Home Assistant's notify service. It creates/delivers messages but does not delete data or execute arbitrary code. Misuse could lead to spam or phishing-style notifications to home occupants, giving it medium severity.

From the tool's definition Send a Home Assistant notification. target = notify service name

Attacks that exploit this kind of access

RECOMMENDED RULE

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

send_notification Rate-limited

send_notification 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": {
    "send_notification": {
      "limits": [
        {
          "counter": "send_notification_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 send_notification call is checked against it from then on.

FAQ

Questions about send_notification

What does the send_notification tool do? +

Send a Home Assistant notification. target = notify service name (default: notify). 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 send_notification? +

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

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

Can I rate-limit send_notification? +

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

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

send_notification 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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