capture_window

Capture a screenshot of the frontmost window. Optionally specify an app name to activate that app first and capture its window. Requires Screen Recording permission.

SERVERAirMCP SOURCEairmcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/heznpc-airmcp/capture-window.md

WHAT IT DOES

What capture_window does on AirMCP

AI agents call capture_window to retrieve information from AirMCP without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why capture_window is rated Low

This tool reads/captures visual data from the screen without modifying or deleting anything. However, it carries medium severity because screenshots can expose sensitive information (passwords, private data, confidential documents) visible on screen if misused by an AI agent.

From the tool's definition Capture a screenshot of the frontmost window... Requires Screen Recording permission.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs capture_window safely

PolicyLayer is an MCP gateway: it sits between your AI agents and AirMCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For capture_window, this is the rule to start with:

capture_window Allowed

capture_window is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

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

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect AirMCP, apply this rule, and every capture_window call is checked against it from then on.

FAQ

Questions about capture_window

What does the capture_window tool do? +

Capture a screenshot of the frontmost window. Optionally specify an app name to activate that app first and capture its window. Requires Screen Recording permission. It is categorised as a Read tool in the AirMCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on capture_window? +

Register the Air MCP server in PolicyLayer and add a rule for capture_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 AirMCP. Nothing to install.

What risk level is capture_window? +

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

Can I rate-limit capture_window? +

Yes. Add a rate_limit block to the capture_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.

How do I block capture_window completely? +

Set action: deny in the PolicyLayer policy for capture_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.

What MCP server provides capture_window? +

capture_window is provided by the Air MCP server (airmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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