view_screenshot

THE RISK

Low Risk

Why view_screenshot needs a policy

This tool retrieves and displays screenshots that have already been captured and stored in a temporary folder. It performs a read-only operation with no ability to modify, delete, or execute actions. The blast radius is minimal—the worst case is exposure of visual information from the screenshots, which are likely from the user's own system context.

From the tool's definition Tool name 'view_screenshot' and description 'View/display a specific screenshot from the temporary folder' indicate retrieval and display of existing data with no modification or side effects.

Documented attack patterns abuse exactly the kind of access view_screenshot gives an agent:

POLICY

How to control view_screenshot

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 view_screenshot:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "view_screenshot": {}
  }
}

view_screenshot is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register macOS Simulator MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More macOS Simulator MCP Server tools

Destructive cleanup_screenshots Clean up old screenshots from temporary folder Execute wait Pause execution for a specified duration in milliseconds to allow time for UI updates, ani Execute wait_for_element Wait for specific text or UI element to appear on screen before continuing. Essential for Execute focus_window Bring a specific window to the foreground and make it the active/focused window using part Execute hover Hover the mouse over specific coordinates for a duration. Useful for triggering tooltips, Execute click Perform mouse clicks at precise screen coordinates with support for left, right, or middle Execute key_press Execute keyboard shortcuts and special key combinations essential for system navigation an Execute mouse_move Move the mouse cursor to precise screen coordinates without clicking. Useful for hover act

All 28 macOS Simulator MCP Server tools →

Read tools on other servers

M-Team MCP Server get_torrent_detail YouTube MCP Server search_channel Android Forensics ADB MCP Server parse_browser_history 0xarchive web3_challenge

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about view_screenshot

What does the view_screenshot tool do? +

View/display a specific screenshot from the temporary folder. It is categorised as a Read tool in the macOS Simulator MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on view_screenshot? +

Register the macOS Simulator MCP Server MCP server in PolicyLayer and add a rule for view_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.

What risk level is view_screenshot? +

view_screenshot is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit view_screenshot? +

Yes. Add a rate_limit block to the view_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.

How do I block view_screenshot completely? +

Set action: deny in the PolicyLayer policy for view_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.

What MCP server provides view_screenshot? +

view_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.

Enforce policy on every macOS Simulator MCP Server tool call.

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.

CHECK YOUR STACK →