events_control · Homeassistant MCP: Risk & Policy

WHAT IT DOES

What events_control does on Homeassistant

AI agents invoke events_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 events_control needs a policy

Based on the tool name and server context, 'events_control' likely triggers or manages Home Assistant events, which can cause automations and device actions to fire. This is an Execute-level action as it can cause external operations to run. However, the empty description significantly lowers confidence.

From the tool's definition Tool name 'events_control' on a Home Assistant MCP server; description is empty and uninformative.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

events_control Rate-limited

events_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": {
    "events_control": {
      "limits": [
        {
          "counter": "events_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 events_control

What does the events_control tool do? +

events_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 events_control? +

Register the Homeassistant MCP server in PolicyLayer and add a rule for events_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 events_control? +

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

Can I rate-limit events_control? +

Yes. Add a rate_limit block to the events_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 events_control completely? +

Set action: deny in the PolicyLayer policy for events_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 events_control? +

events_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.