set_power · Ulanzi MCP: Risk & Policy

WHAT IT DOES

What set_power does on Ulanzi

AI agents use set_power 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_power needs a policy

This tool controls the power state of a physical device (Ulanzi TC001 pixel clock display). It modifies the operational state of the device reversibly — turning it on or off can be undone by calling the tool again. No data is deleted and no code is executed, making Write the appropriate category. Misuse could cause disruption (e.g., turning off displays unexpectedly) but is reversible, so severity is medium.

From the tool's definition Turn the matrix display on or off

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_power Rate-limited

set_power 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_power": {
      "limits": [
        {
          "counter": "set_power_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_power

What does the set_power tool do? +

Turn the matrix display on or off. 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_power? +

Register the Ulanzi MCP server in PolicyLayer and add a rule for set_power: 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_power? +

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

Can I rate-limit set_power? +

Yes. Add a rate_limit block to the set_power 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_power completely? +

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

set_power 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.