listen_state_changes

A read tool on the Ha Nexus Agent MCP server.

SERVERHa Nexus Agent SOURCEfistacho/ha-nexus-agent

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/fistacho-ha-nexus-agent/listen-state-changes.md

WHAT IT DOES

What listen_state_changes does on Ha Nexus Agent

AI agents call listen_state_changes to retrieve information from Ha Nexus Agent without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why listen_state_changes is rated Low

Tool appears to observe state changes without modifying smart home systems based on naming and context.

From the tool's definition uninformative description; name suggests monitoring/listening to state changes

Attacks that exploit this kind of access

RECOMMENDED RULE

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

listen_state_changes Allowed

listen_state_changes is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "listen_state_changes": {}
  }
}

ALLOW ONLY 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 listen_state_changes call is checked against it from then on.

FAQ

Questions about listen_state_changes

What does the listen_state_changes tool do? +

listen_state_changes is a read tool on the Ha Nexus Agent MCP server. It is categorised as a Read tool in the Ha Nexus Agent MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on listen_state_changes? +

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

listen_state_changes is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit listen_state_changes? +

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

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

listen_state_changes 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.

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