unifi_set_lcd_message · Garza Home MCP: Risk & Policy

WHAT IT DOES

What unifi_set_lcd_message does on Garza Home MCP

AI agents use unifi_set_lcd_message 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_lcd_message needs a policy

This tool modifies the LCD display message on a UniFi doorbell, a reversible change. It does not execute arbitrary code (Execute), delete data (Destructive), or move money (Financial). While it affects a security device, the impact is limited to displaying a message, making it Write rather than Execute.

From the tool's definition Tool name is 'unifi_set_lcd_message' with description 'Set doorbell LCD'; the verb 'set' indicates modification of doorbell display state, which is a reversible write operation on a connected device.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

unifi_set_lcd_message Rate-limited

unifi_set_lcd_message 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_lcd_message": {
      "limits": [
        {
          "counter": "unifi_set_lcd_message_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_lcd_message

What does the unifi_set_lcd_message tool do? +

Set doorbell LCD. 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_lcd_message? +

Register the Garza Home MCP server in PolicyLayer and add a rule for unifi_set_lcd_message: 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_lcd_message? +

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

Can I rate-limit unifi_set_lcd_message? +

Yes. Add a rate_limit block to the unifi_set_lcd_message 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_lcd_message completely? +

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

unifi_set_lcd_message 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.