Get information about the currently active (frontmost) window: app name, window title, position, and size.
AI agents call get_active_window to retrieve information from Computer Use MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only retrieves information about the active window's state (app name, title, position, size) with no side effects. It performs a query operation that does not modify, execute, or delete anything. While it could theoretically inform subsequent actions in a desktop automation context, the tool itself is purely informational and falls squarely into the Read category with low severity.
From the tool's definition Tool description states it 'Get[s] information about the currently active (frontmost) window: app name, window title, position, and size.' The verb 'Get' and the passive nature of retrieving metadata with no modification or execution capability confirm this…
Attacks that exploit this kind of access
Get information about the currently active (frontmost) window: app name, window title, position, and size. It is categorised as a Read tool in the Computer Use MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Computer Use MCP Server MCP server in PolicyLayer and add a rule for get_active_window: 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 Computer Use MCP Server. Nothing to install.
get_active_window 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 get_active_window 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 get_active_window. 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.
get_active_window is provided by the Computer Use MCP Server MCP server (syedazharmbnr1/computer-use-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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