activate_scene

Activate a scene.

SERVERHa Nexus Agent SOURCEfistacho/ha-nexus-agent

High RISK CLASS

Category Execute

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/activate-scene.md

WHAT IT DOES

What activate_scene does on Ha Nexus Agent

AI agents invoke activate_scene to trigger actions in Ha Nexus Agent. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

RISK

Why activate_scene is rated High

Activating a scene causes real-world side effects by triggering multiple home automation devices/states simultaneously. It is not purely destructive or financial, but it executes external operations whose effects depend on the scene's configuration. Misuse could cause unintended changes to lighting, HVAC, locks, or other devices.

From the tool's definition Activate a scene — triggers an external operation in the smart home (turns on/off devices, changes states) based on a scene configuration

Attacks that exploit this kind of access

RECOMMENDED RULE

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

activate_scene Rate-limited

activate_scene stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "activate_scene": {
      "limits": [
        {
          "counter": "activate_scene_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-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 activate_scene call is checked against it from then on.

FAQ

Questions about activate_scene

What does the activate_scene tool do? +

Activate a scene. It is categorised as a Execute tool in the Ha Nexus Agent MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on activate_scene? +

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

activate_scene is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit activate_scene? +

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

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

activate_scene 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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All 276 Ha Nexus Agent tools → High-risk tools on this server →

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All high-risk MCP tools → The MCP Attack Database →

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