screenshot
Screenshot Skill
Take screenshots using macOS screencapture command via Bash.
Important: Always Resize for Context
Full-resolution screenshots (especially on Retina/5K displays) produce huge base64 that will exceed the model's context length. Always resize before reading.
Take and View a Screenshot
# 1. Capture full screen
/usr/sbin/screencapture -x -t jpg /tmp/alma-screenshot.jpg
# 2. Resize to 1024px wide (critical for context size!)
/usr/bin/sips --resampleWidth 1024 --setProperty formatOptions 60 /tmp/alma-screenshot.jpg --out /tmp/alma-screenshot-thumb.jpg 2>/dev/null
# 3. Get dimensions
/usr/bin/sips -g pixelWidth -g pixelHeight /tmp/alma-screenshot.jpg 2>/dev/null
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