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Agent skill

Skin Screenshots

by ad-repo in ad-repo/nullplayer

Capture one centred main-window screenshot per skin across every skin system (Classic, Original, Original-Metal, Modern/.wal, Media Player/.wmz, Audion Faces) and assemble them into a fixed-duration…

Custom licenceAuto-check passed

Install Skin Screenshots

skills CLI
$ npx skills add ad-repo/nullplayer --skill skin-screenshots -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install ad-repo/nullplayer skin-screenshots --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/ad-repo/nullplayer.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/skin-screenshots .claude/skills/skin-screenshots && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
skin-screenshots
GitHub stars
158
Token cost
~2k tokens
SKILL.md length
1,103 words
Files
7 (incl. scripts)
Skills in repo
40
Repo updated
First seen
Licence
Custom licence

At a glance

Capture one centred main-window screenshot per skin across every skin system (Classic, Original, Original-Metal, Modern/.wal, Media Player/.wmz, Audion Faces) and assemble them into a fixed-duration…

  • Works in 4 steps: Confirm the skin system before… → Window geometry is not a "skin loaded"… → Centre the artwork, not the window rect → …
  • Producing marketing imagery
  • SKILL.md covers The operator has to set the…, What each script does, The four rules that make this… and A skin can mute playback, plus 3 more sections
  • Runs Shell scripts from its folder

What it does

Skin Screenshots is an agent skill from ad-repo/nullplayer. Capture one centred main-window screenshot per skin across every skin system (Classic, Original, Original-Metal, Modern/.wal, Media Player/.wmz, Audion Faces) and assemble them into a fixed-duration slideshow GIF. Use when producing marketing imagery, a skin gallery, or any before/after visual comparison across the skin corpus.

Its SKILL.md is about 2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 7 other files, including scripts (for example `scripts/capture.sh`, `scripts/enumerate_skins.sh` and `scripts/makegif.sh`).

The repository describes itself as: nullPlayer is a free open source macOS media player with some unique features.

When your agent uses it

  • Producing marketing imagery
  • Any before/after visual comparison across the skin corpus

Example prompts

  • “/skin-screenshots”

Requirements

  • A Bash shell

Workflow steps

4 steps, taken from the step headings in SKILL.md.

  1. Confirm the skin system before photographing
  2. Window geometry is not a "skin loaded" signal
  3. Centre the artwork, not the window rect
  4. Distrust a tiny trim box

What it can do on your machine

Read from SKILL.md and the folder at commit bd7ddac. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Ships 5 files in scripts/ (Shell), which the agent can run.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Skin Screenshots loads about 2k tokens when it runs. Until then it costs about 87 tokens; SKILL.md has 1,103 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~87
When it runs · the whole SKILL.md, loaded when a task matches
~2k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 1,103 words (~2,028 tokens).

“Photographs the main window only, one frame per skin, across all six skin systems, centres each on an identical white frame, and builds a slideshow GIF whose cycle is exactly the length you ask for.”

— opening of SKILL.md by ad-repo, Custom licence
name
skin-screenshots

Read the full SKILL.md on GitHub

Files

SKILL.md and 6 other files (scripts) in skills/skin-screenshots of ad-repo/nullplayer.

  • SKILL.md
  • exclude.txt
  • scripts/capture.sh
  • scripts/enumerate_skins.sh
  • scripts/makegif.sh
  • scripts/preflight.sh
  • scripts/reframe.sh

Open the folder on GitHubat commit bd7ddac

Compare with similar skills

Skin Screenshots next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Skin Screenshots compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Skin Screenshots this skillad-repo/nullplayer158—~2kAutomated safety check: PassCustom licence
Screenshotnexu-io/open-design100k—~291Automated safety check: PassApache-2.0
Terminal Screenshot CaptureQwenLM/qwen-code28k—~2kAutomated safety check: PassApache-2.0
Screenshot CaptureCoWork-OS/CoWork-OS477—~403Automated safety check: PassMIT
Capturealirezarezvani/claude-skills28k1 repos~2.8kAutomated safety check: PassMIT
cmux Screenshot and Recordingmanaflow-ai/cmux28k—~992Automated safety check: PassCustom licence

Similar skills

  • Screenshot

    nexu-io/open-design

    Capture desktop, app windows, or pixel regions across OS platforms.

    100k GitHub stars~291 tokensUpdated yesterday
    Testing & QAAuto-check passed

  • Terminal Screenshot Capture

    QwenLM/qwen-code

    Drives a CLI through a TypeScript scenario and saves terminal screenshots at each step, so pull requests that change command output can be checked visually.

    28k GitHub stars~2k tokensUpdated today
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  • Screenshot Capture

    CoWork-OS/CoWork-OS

    Capture desktop screenshots with OS-aware save-location rules, app/window/region support, and bundled helpers.

    477 GitHub stars~403 tokensUpdated yesterday
    Auto-check passed

  • Capture

    alirezarezvani/claude-skills

    Captures and organizes chaotic brain dumps into a structured, actionable system with zero information loss.

    28k GitHub starsUsed in 1 repo~2.8k tokens
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  • cmux Screenshot and Recording

    manaflow-ai/cmux

    Captures PNG or JPEG screenshots and MP4 or GIF clips of cmux windows from the command line, as visual evidence for pull requests and bug reports.

    28k GitHub stars~992 tokensUpdated today
    Testing & QAAuto-check passed

  • Windows Desktop E2E

    affaan-m/ECC

    E2E testing for Windows native desktop apps (WPF, WinForms, Win32/MFC, Qt) using pywinauto and Windows UI Automation.

    277k GitHub starsUsed in 1 repo~7.6k tokens
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More from ad-repo/nullplayer

All 40 skills in this repo

  • Vis Classic Guide

    ad-repo/nullplayer

    Comprehensive implementation and profile reference for NullPlayer's visclassic mode (CVisClassicCore, VisClassicBridge, SpectrumAnalyzerView integration, menu/keyboard controls…

    158 GitHub stars~739 tokensUpdated today
    Auto-check passed

  • App Control

    ad-repo/nullplayer

    Launch, configure, drive, screenshot and measure the running NullPlayer app.

    158 GitHub stars~9.4k tokensUpdated today
    Auto-check passed

  • Chromecast Casting

    ad-repo/nullplayer

    Google Cast Protocol v2, message framing, debugging, and test scripts.

    158 GitHub stars~4.6k tokensUpdated today
    Auto-check passed

  • Emby Integration

    ad-repo/nullplayer

    Emby API, authentication flow, rating scale, streaming, scrobbling, and video playback.

    158 GitHub stars~3.2k tokensUpdated today
    Auto-check passed

  • Live UI Testing

    ad-repo/nullplayer

    How to debug a defect that only exists on screen — instrument first, drive the app yourself, and measure what is actually drawn.

    158 GitHub stars~4.1k tokensUpdated today
    Auto-check passed

  • Metal Gotchas

    ad-repo/nullplayer

    Cross-cutting Metal pitfalls in NullPlayer's visualization code — command encoder ordering, render-to-texture y-flip, shader availability checks, and the AudioEngine spectrum coalescing pattern that…

    158 GitHub stars~1.4k tokensUpdated today
    Auto-check passed

Questions about Skin Screenshots

What does Skin Screenshots do?

Capture one centred main-window screenshot per skin across every skin system (Classic, Original, Original-Metal, Modern/.wal, Media Player/.wmz, Audion Faces) and assemble them into a fixed-duration…. Skin Screenshots is an agent skill from ad-repo/nullplayer.wmz, Audion Faces) and assemble them into a fixed-duration slideshow GIF.

When should I use Skin Screenshots?

Skin Screenshots fits situations like: producing marketing imagery; any before/after visual comparison across the skin corpus.

How do I install Skin Screenshots in Claude Code?

Run `npx skills add ad-repo/nullplayer --skill skin-screenshots -a claude-code`. Or copy the skill folder (skills/skin-screenshots in ad-repo/nullplayer) into .claude/skills/skin-screenshots in your project. Claude Code loads it when a task matches its description.

How do I install Skin Screenshots in Codex?

Run `npx skills add ad-repo/nullplayer --skill skin-screenshots -a codex`. Or copy the skill folder (skills/skin-screenshots in ad-repo/nullplayer) into .agents/skills/skin-screenshots in your project. Codex loads it when a task matches its description.

Can I use Skin Screenshots in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add ad-repo/nullplayer --skill skin-screenshots -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/skin-screenshots, .gemini/skills/skin-screenshots, .github/skills/skin-screenshots and .opencode/skills/skin-screenshots in your project.

What does Skin Screenshots need to run?

Going by SKILL.md and its folder, Skin Screenshots needs a shell for the scripts in its folder. Our summary lists: A Bash shell.

Does Skin Screenshots access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Skin Screenshots safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Skin Screenshots use?

Skin Screenshots has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Skin Screenshots use?

About 2k tokens (SKILL.md is roughly 8.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Skin Screenshots?

Skills that share tags, products or a category with Skin Screenshots: Screenshot (nexu-io/open-design, 100k stars), Terminal Screenshot Capture (QwenLM/qwen-code, 28k stars), Screenshot Capture (CoWork-OS/CoWork-OS, 477 stars) and Capture (alirezarezvani/claude-skills, 28k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Skin Screenshots?

ad-repo (a GitHub user) maintains it in ad-repo/nullplayer, which has 158 GitHub stars. The repository holds 40 skills in this directory. The repository was last updated on October 11, 2026.

Source: ad-repo/nullplayer on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.