set_indicator · Ulanzi MCP: Risk & Policy

WHAT IT DOES

What set_indicator does on Ulanzi

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

WHY IT NEEDS A POLICY

Why set_indicator needs a policy

The tool modifies indicator state on a smart display device, which is a reversible write operation. No description provided, but the naming pattern and API context (AWTRIX3 controls) indicate it sets/updates visual indicators on the clock. This could affect device appearance and notification display.

From the tool's definition Tool name 'set_indicator' and context of AWTRIX3 API controlling Ulanzi TC001 Smart Pixel Clock suggest modification of display indicators.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_indicator Rate-limited

set_indicator 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": {
    "set_indicator": {
      "limits": [
        {
          "counter": "set_indicator_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 Ulanzi, so you can run agents against it safely.

FAQ

Questions about set_indicator

What does the set_indicator tool do? +

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

How do I enforce a policy on set_indicator? +

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

What risk level is set_indicator? +

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

Can I rate-limit set_indicator? +

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

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

set_indicator is provided by the Ulanzi MCP server (jelloeater/ulanzi-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.