AI agents call os_windows to retrieve information from OScribe without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and displays information about currently open windows on the desktop. It performs a read-only query with no capability to modify, execute, delete, or transfer resources. The blast radius of misuse is minimal—an AI agent could learn about open applications but cannot directly interact with or harm them through this tool alone.
From the tool's definition Tool name 'os_windows' and description 'List all open windows' indicate a query operation that retrieves window information with no side effects.
Attacks that exploit this kind of access
List all open windows. It is categorised as a Read tool in the OScribe MCP Server, which means it retrieves data without modifying state.
Register the OScribe MCP server in PolicyLayer and add a rule for os_windows: 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 OScribe. Nothing to install.
os_windows 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 os_windows 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 os_windows. 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.
os_windows is provided by the OScribe MCP server (mikealkeal/oscribe). 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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