How do I install the Screenshot skill?

Run npx skillmds@latest add johnalbertini14-glitch/screenshot in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

What does the Screenshot skill do?

Capture screens, windows, and regions across platforms with the right tools. It is listed under Coding & Dev Tools on SkillMD.

Is Screenshot safe to use?

This skill has not completed SkillMD's automated safety review yet. Independent scanners report: SkillSpector: PASS, Skill Scanner: PASS. Capability flags: docs only. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Screenshot?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Screenshot free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Screenshot?

johnalbertini14-glitch (@johnalbertini14-glitch) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Screenshot by johnalbertini14-glitch

Name: Screenshot
Rating: 4.666666666666667 (3 reviews)
Author: johnalbertini14-glitch

File contents

macOS

Use screencapture (built-in): screencapture -x output.png for silent capture, -i for interactive selection
Capture specific window by PID: screencapture -l$(osascript -e 'tell app "AppName" to id of window 1') out.png
For retina displays, output is 2x resolution by default — add -R x,y,w,h to capture exact pixel region
iOS Simulator: xcrun simctl io booted screenshot output.png — faster and more reliable than screencapture

Linux

gnome-screenshot for GNOME, spectacle for KDE, scrot for minimal/headless
Headless X11: xvfb-run scrot output.png — creates virtual display for CI environments
Wayland sessions break X11 tools silently — use grim for Wayland, slurp for region selection

Windows

PowerShell built-in: Add-Type -AssemblyName System.Windows.Forms; [System.Windows.Forms.Screen]::PrimaryScreen | ... is verbose — prefer nircmd savescreenshot
nircmd savescreenshot output.png works from CLI without dependencies on most Windows versions
For programmatic capture, python -m PIL.ImageGrab works cross-platform but requires Pillow installed

Web Pages

Playwright: npx playwright screenshot URL output.png --full-page — handles JavaScript rendering and scrolling
Always wait for network idle: --wait-for-timeout=5000 or page never finishes loading dynamic content
Full-page screenshots of long pages pixelate when viewed — split into viewport-sized chunks instead
Puppeteer equivalent: page.screenshot({fullPage: true}) after networkidle0

Format and Quality

PNG for UI/text (lossless), JPEG for photos (smaller files)
JPEG quality 85-92 is optimal — below 80 shows artifacts on text, above 95 gains little
WebP offers 25-35% smaller files than JPEG at same quality — supported everywhere except older Safari

Automation Patterns

Add timestamps to filenames: screenshot-$(date +%Y%m%d-%H%M%S).png — prevents overwrites in batch jobs
For comparison testing, use identical viewport sizes — different resolutions create false diffs
CI screenshot artifacts: compress with pngquant or jpegoptim before upload — saves storage and transfer time

---name: screenshotdescription: Capture screens, windows, and regions across platforms with the right tools.---## macOS- Use `screencapture` (built-in): `screencapture -x output.png` for silent capture, `-i` for interactive selection- Capture specific window by PID: `screencapture -l$(osascript -e 'tell app "AppName" to id of window 1') out.png`- For retina displays, output is 2x resolution by default — add `-R x,y,w,h` to capture exact pixel region- iOS Simulator: `xcrun simctl io booted screenshot output.png` — faster and more reliable than screencapture## Linux- `gnome-screenshot` for GNOME, `spectacle` for KDE, `scrot` for minimal/headless- Headless X11: `xvfb-run scrot output.png` — creates virtual display for CI environments- Wayland sessions break X11 tools silently — use `grim` for Wayland, `slurp` for region selection## Windows- PowerShell built-in: `Add-Type -AssemblyName System.Windows.Forms; [System.Windows.Forms.Screen]::PrimaryScreen | ...` is verbose — prefer `nircmd savescreenshot`- `nircmd savescreenshot output.png` works from CLI without dependencies on most Windows versions- For programmatic capture, `python -m PIL.ImageGrab` works cross-platform but requires Pillow installed## Web Pages- Playwright: `npx playwright screenshot URL output.png --full-page` — handles JavaScript rendering and scrolling- Always wait for network idle: `--wait-for-timeout=5000` or page never finishes loading dynamic content- Full-page screenshots of long pages pixelate when viewed — split into viewport-sized chunks instead- Puppeteer equivalent: `page.screenshot({fullPage: true})` after `networkidle0`## Format and Quality- PNG for UI/text (lossless), JPEG for photos (smaller files)- JPEG quality 85-92 is optimal — below 80 shows artifacts on text, above 95 gains little- WebP offers 25-35% smaller files than JPEG at same quality — supported everywhere except older Safari## Automation Patterns- Add timestamps to filenames: `screenshot-$(date +%Y%m%d-%H%M%S).png` — prevents overwrites in batch jobs- For comparison testing, use identical viewport sizes — different resolutions create false diffs- CI screenshot artifacts: compress with `pngquant` or `jpegoptim` before upload — saves storage and transfer time

Frequently asked questions

Screenshot