AI agents call window_size to retrieve information from uiautomator2 MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
'window_size' strongly implies a read-only operation that queries the display dimensions. No description is provided to confirm side effects, but the name alone suggests a simple data retrieval with no write, execute, or destructive implications. Confidence is moderate due to the empty description.
From the tool's definition Tool name is 'window_size'; description is empty. Based on the name, it likely retrieves the screen/window dimensions of the Android device.
Documented attack patterns abuse exactly the kind of access window_size gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and uiautomator2 MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for window_size:
{
"version": "1",
"default": "deny",
"tools": {
"window_size": {}
}
}window_size is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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window_size. It is categorised as a Read tool in the uiautomator2 MCP Server MCP Server, which means it retrieves data without modifying state.
Register the uiautomator2 MCP Server MCP server in PolicyLayer and add a rule for window_size: 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 uiautomator2 MCP Server. Nothing to install.
window_size is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the window_size 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 window_size. 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.
window_size is provided by the uiautomator2 MCP Server MCP server (tanbro/uiautomator2-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from uiautomator2 MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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77 uiautomator2 MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.