Capture Screen Macos

Screen Capture Skill

Capabilities

• Take full screen screenshots.
• Take screenshots of specific application windows (e.g., Browsers like Google Chrome, Safari).
• Get information about the currently active window or list all windows.

Best Practices

⚠️ IMPORTANT: Before taking a window-specific screenshot, ALWAYS list all available windows first to identify the correct window name. Window names can vary (e.g., "Google Chrome", "Chrome", localized names like "谷歌浏览器"), so listing helps ensure you use the exact name.

Recommended Workflow:

1. Run python3 capture-screen-macos/window_info.py list to see all available windows
2. Identify the exact app name from the JSON output
3. Use that exact app name in the screenshot command

Usage

1. Get Window Information (CRITICAL FIRST STEP)

⭐ ALWAYS START HERE when capturing specific windows to avoid errors.

List All Windows (Recommended): Returns a JSON array with all detected windows, including app name, window title, ID, bounds, and area.

python3 capture-screen-macos/window_info.py list

Example output:

[
  {
    "app": "Google Chrome",
    "title": "GitHub - example/repo",
    "id": 12345,
    "bounds": {"X": 0, "Y": 25, "Width": 1920, "Height": 1080},
    "area": 2073600
  },
  {
    "app": "Visual Studio Code",
    "title": "skill.md - oai-skills",
    "id": 67890,
    "bounds": {"X": 100, "Y": 100, "Width": 1200, "Height": 800},
    "area": 960000
  }
]

Get Active Window Info: Returns JSON with info about the currently active (frontmost) window.

python3 capture-screen-macos/window_info.py active

2. Take Screenshots

Full Screen Screenshot

Run the python script with the full command:

python3 capture-screen-macos/screenshot.py full <output_path>

Example:

python3 capture-screen-macos/screenshot.py full /tmp/my_screen.png

Window Screenshot

Run the python script with the window command, specifying the application name and output path.

⚠️ Important: Use the exact app name from window_info.py list output for best results. The script supports fuzzy matching (e.g. "Safari" matches "Safari浏览器"), but exact matches are more reliable.

python3 capture-screen-macos/screenshot.py window "<App Name>" <output_path>

Examples:

python3 capture-screen-macos/screenshot.py window "Google Chrome" /tmp/chrome_window.png
python3 capture-screen-macos/screenshot.py window "Safari" /tmp/safari_window.png
python3 capture-screen-macos/screenshot.py window "Visual Studio Code" /tmp/vscode_window.png

List Windows (Human Readable)

To see a formatted table of windows for quick reference:

python3 capture-screen-macos/screenshot.py list

Dependencies & Requirements

• macOS.
• Python 3.
• swift (installed by default on macOS) for low-level window queries.
• Permissions to control "System Events" (for active app detection).