set_screen_brightness · Android MCP Server MCP

WHAT IT DOES

What set_screen_brightness does on Android MCP Server

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

WHY IT NEEDS A POLICY

Why set_screen_brightness needs a policy

This tool modifies a device display setting (screen brightness) which is a reversible write operation. It changes a system setting but has no destructive, financial, or code-execution implications. Blast radius is low — misuse would only alter display brightness, which is trivially reversible.

From the tool's definition Set screen brightness (0-255)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_screen_brightness Rate-limited

set_screen_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_screen_brightness": {
      "limits": [
        {
          "counter": "set_screen_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 Android MCP Server, so you can run agents against it safely.

FAQ

Questions about set_screen_brightness

What does the set_screen_brightness tool do? +

Set screen brightness (0-255). Requires Shizuku/ADB. It is categorised as a Write tool in the Android MCP Server 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_screen_brightness? +

Register the Android MCP Server MCP server in PolicyLayer and add a rule for set_screen_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 Android MCP Server. Nothing to install.

What risk level is set_screen_brightness? +

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

Can I rate-limit set_screen_brightness? +

Yes. Add a rate_limit block to the set_screen_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_screen_brightness completely? +

Set action: deny in the PolicyLayer policy for set_screen_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_screen_brightness? +

set_screen_brightness is provided by the Android MCP Server MCP server (wujie272/android-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.