turn_light_on · Philips Hue MCP Service MCP: Risk & Policy

WHAT IT DOES

What turn_light_on does on Philips Hue MCP Service

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

WHY IT NEEDS A POLICY

Why turn_light_on needs a policy

This tool changes the state of a physical Hue light from off to on. It is a reversible write operation (the light can be turned off again). No data is deleted, no code is executed, and no financial transaction occurs. Blast radius is minimal — limited to toggling a smart bulb.

From the tool's definition 'Turn on a specific light' — creates a new state (on) for a Hue light

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

turn_light_on Rate-limited

turn_light_on 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": {
    "turn_light_on": {
      "limits": [
        {
          "counter": "turn_light_on_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 Philips Hue MCP Service, so you can run agents against it safely.

FAQ

Questions about turn_light_on

What does the turn_light_on tool do? +

Turn on a specific light. It is categorised as a Write tool in the Philips Hue MCP Service MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on turn_light_on? +

Register the Philips Hue MCP Service MCP server in PolicyLayer and add a rule for turn_light_on: 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 Philips Hue MCP Service. Nothing to install.

What risk level is turn_light_on? +

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

Can I rate-limit turn_light_on? +

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

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

turn_light_on is provided by the Philips Hue MCP Service MCP server (plwp/hue-mcp-service). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.