unifi_set_light · Garza Home MCP: Risk & Policy

WHAT IT DOES

What unifi_set_light does on Garza Home MCP

AI agents use unifi_set_light to create or update resources in Garza Home MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Garza Home MCP environment.

WHY IT NEEDS A POLICY

Why unifi_set_light needs a policy

This tool writes a new state to a smart light (on/off, brightness, etc.). It is reversible (the light can be turned back on/off), so it falls under Write rather than Destructive. Misuse could disrupt home lighting, but blast radius is limited to physical lighting control, hence medium severity.

From the tool's definition 'Control light' — sets the state of a UniFi light device

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

unifi_set_light Rate-limited

unifi_set_light 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": {
    "unifi_set_light": {
      "limits": [
        {
          "counter": "unifi_set_light_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about unifi_set_light

What does the unifi_set_light tool do? +

Control light. It is categorised as a Write tool in the Garza Home MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on unifi_set_light? +

Register the Garza Home MCP server in PolicyLayer and add a rule for unifi_set_light: 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 Garza Home MCP. Nothing to install.

What risk level is unifi_set_light? +

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

Can I rate-limit unifi_set_light? +

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

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

unifi_set_light is provided by the Garza Home MCP server (itsablabla/garza-home-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.