Wait until the device screen is turned on. Useful for asynchronous operations where screen activation is expected.
AI agents invoke wait_for_screen_on to trigger actions in MCP Android Agent. 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.
This tool executes a command that waits for and monitors device state changes. While it doesn't directly modify data or execute arbitrary code, it is a control operation that triggers external effects on the Android device and can be part of a larger automation chain. It fits Execute category as it orchestrates device behavior whose effects depend on context.
From the tool's definition Tool performs an asynchronous blocking operation ('Wait until the device screen is turned on') that triggers external device state changes and can affect subsequent automation sequences.
Documented attack patterns abuse exactly the kind of access wait_for_screen_on gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Android Agent, and nothing reaches the server without passing your rules. This is the rule we recommend for wait_for_screen_on:
{
"version": "1",
"default": "deny",
"tools": {
"wait_for_screen_on": {
"limits": [
{
"counter": "wait_for_screen_on_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}wait_for_screen_on 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.
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Wait until the device screen is turned on. Useful for asynchronous operations where screen activation is expected. It is categorised as a Execute tool in the MCP Android Agent MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the MCP Android Agent MCP server in PolicyLayer and add a rule for wait_for_screen_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 MCP Android Agent. Nothing to install.
wait_for_screen_on is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the wait_for_screen_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.
Set action: deny in the PolicyLayer policy for wait_for_screen_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.
wait_for_screen_on is provided by the MCP Android Agent MCP server (nim444/mcp-android-server-python). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 28 MCP Android Agent tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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28 MCP Android Agent tools catalogued and risk-classified — across an index of 42,500+ MCP servers.