Capture and comprehensively analyze a screenshot with AI-powered insights. Combines screen capture with OCR text extraction, UI element detection, and intelligent content analysis. Automatically saves screenshots for later reference and provides detailed descriptions of visual content, detected U...
AI agents call describe_screenshot to retrieve information from macOS Simulator MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is fundamentally a Read operation—it retrieves and analyzes visual information from the screen without modifying any underlying data or executing arbitrary code. However, severity is 'medium' rather than 'low' because the tool enables comprehensive visual reconnaissance of the screen, which could allow an AI agent to extract sensitive information (passwords, credentials, private data) from displayed content if…
From the tool's definition The tool 'Capture and comprehensively analyze a screenshot' performs visual analysis, OCR text extraction, UI element detection, and content analysis.
Documented attack patterns abuse exactly the kind of access describe_screenshot gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and macOS Simulator MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for describe_screenshot:
{
"version": "1",
"default": "deny",
"tools": {
"describe_screenshot": {}
}
}describe_screenshot is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Capture and comprehensively analyze a screenshot with AI-powered insights. Combines screen capture with OCR text extraction, UI element detection, and intelligent content analysis. Automatically saves screenshots for later reference and provides detailed descriptions of visual content, detected UI elements (buttons, links, dialogs, etc.), and actionable insights. Perfect for understanding screen content, documenting UI states, debugging interface issues, and enabling AI to comprehend visual context. Returns structured analysis including extracted text, clickable elements, element positions, and human-readable summary of screen contents. It is categorised as a Read tool in the macOS Simulator MCP Server MCP Server, which means it retrieves data without modifying state.
Register the macOS Simulator MCP Server MCP server in PolicyLayer and add a rule for describe_screenshot: 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 macOS Simulator MCP Server. Nothing to install.
describe_screenshot 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 describe_screenshot 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 describe_screenshot. 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.
describe_screenshot is provided by the macOS Simulator MCP Server MCP server (ohqay/mac-commander). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from macOS Simulator MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
28 macOS Simulator MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.