climate_control · Homeassistant MCP: Risk & Policy

WHAT IT DOES

What climate_control does on Homeassistant

AI agents invoke climate_control to trigger actions in Homeassistant. 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.

WHY IT NEEDS A POLICY

Why climate_control needs a policy

The tool name 'climate_control' strongly implies it controls HVAC/climate devices (thermostats, AC, heating) in Home Assistant. Controlling climate systems can have significant physical consequences (temperature changes affecting comfort, health, or even equipment), placing it in the Execute category. However, the description is empty, which reduces confidence.

From the tool's definition Tool name 'climate_control' on a Home Assistant MCP server designed to 'control Home Assistant devices and services'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

climate_control Rate-limited

climate_control 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": {
    "climate_control": {
      "limits": [
        {
          "counter": "climate_control_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Homeassistant, so you can run agents against it safely.

FAQ

Questions about climate_control

What does the climate_control tool do? +

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

How do I enforce a policy on climate_control? +

Register the Homeassistant MCP server in PolicyLayer and add a rule for climate_control: 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 Homeassistant. Nothing to install.

What risk level is climate_control? +

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

Can I rate-limit climate_control? +

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

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

climate_control is provided by the Homeassistant MCP server (robbrad/homeassistant-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

// THE FULL RECORD

climate_control is one line of Homeassistant's registry record.

The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.

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