set_light_brightness · Philips Hue MCP Service MCP

WHAT IT DOES

What set_light_brightness does on Philips Hue MCP Service

AI agents use set_light_brightness 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 set_light_brightness needs a policy

This tool writes a new brightness value to a Philips Hue light. It is a reversible modification (brightness can be changed back), so it falls under Write. The blast radius is low since it only affects a single smart light's brightness level.

From the tool's definition 'Set brightness of a specific light' — modifies a light's brightness setting, which is a reversible state change

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_light_brightness Rate-limited

set_light_brightness 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_light_brightness": {
      "limits": [
        {
          "counter": "set_light_brightness_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 set_light_brightness

What does the set_light_brightness tool do? +

Set brightness of 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 set_light_brightness? +

Register the Philips Hue MCP Service MCP server in PolicyLayer and add a rule for set_light_brightness: 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 set_light_brightness? +

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

Can I rate-limit set_light_brightness? +

Yes. Add a rate_limit block to the set_light_brightness 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_light_brightness completely? +

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

set_light_brightness 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.