List the titles of all currently open windows.
AI agents call list_open_windows to retrieve information from Simple MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves window titles from the system—a read-only operation with no side effects, no code execution, no data modification, and no irreversible actions. The blast radius of misuse is minimal; an AI agent querying open windows cannot cause harm beyond potential information disclosure about what windows are visible.
From the tool's definition Tool name 'list_open_windows' and description 'List the titles of all currently open windows' indicate a query operation that retrieves information about system state without modifying or executing actions.
Attacks that exploit this kind of access
List the titles of all currently open windows. It is categorised as a Read tool in the Simple MCP MCP Server, which means it retrieves data without modifying state.
Register the Simple MCP server in PolicyLayer and add a rule for list_open_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 Simple MCP. Nothing to install.
list_open_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 list_open_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 list_open_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.
list_open_windows is provided by the Simple MCP server (karar-hayder/simple-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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