set_sleep · Ulanzi MCP: Risk & Policy

WHAT IT DOES

What set_sleep does on Ulanzi

AI agents invoke set_sleep to trigger actions in Ulanzi. 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 set_sleep needs a policy

This tool triggers an external physical operation on the Ulanzi TC001 Smart Pixel Clock device, putting it into deep sleep mode. While reversible in theory (the device can be woken up), it executes a real-world hardware state change with operational consequences.

From the tool's definition Send the clock to deep sleep mode

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_sleep Rate-limited

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

FAQ

Questions about set_sleep

What does the set_sleep tool do? +

Send the clock to deep sleep mode. It is categorised as a Execute tool in the Ulanzi MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on set_sleep? +

Register the Ulanzi MCP server in PolicyLayer and add a rule for set_sleep: 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_sleep? +

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

Can I rate-limit set_sleep? +

Yes. Add a rate_limit block to the set_sleep 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_sleep completely? +

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

set_sleep 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.