Agent skill

Main Window Visualization

by ad-repo in ad-repo/nullplayer

The main window's built-in 76×16 (Winamp coordinates) visualization area — twelve display modes, mode switching, persistence, per-mode settings, and embedded renderer lifecycles.

Custom licenceAuto-check passed

Install Main Window Visualization

skills CLI
$ npx skills add ad-repo/nullplayer --skill main-window-visualization -a claude-code

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

GitHub CLI
$ gh skill install ad-repo/nullplayer main-window-visualization --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/main-window-visualization .claude/skills/main-window-visualization && 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
main-window-visualization
GitHub stars
157
Token cost
~1.2k tokens
SKILL.md length
477 words
Files
1
Skills in repo
39
Repo updated
First seen
Licence
Custom licence

At a glance

The main window's built-in 76×16 (Winamp coordinates) visualization area — twelve display modes, mode switching, persistence, per-mode settings, and embedded renderer lifecycles.

  • Modifying the in-skin visualizer area
  • SKILL.md covers Modes, Switching Modes, Settings and Implementation, plus 1 more section
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Main Window Visualization is an agent skill from ad-repo/nullplayer. The main window's built-in 76×16 (Winamp coordinates) visualization area — twelve display modes, mode switching, persistence, per-mode settings, and embedded renderer lifecycles. Use when modifying the in-skin visualizer area or its menu.

Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

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

When your agent uses it

  • Modifying the in-skin visualizer area

Example prompts

  • “/main-window-visualization”

What it can do on your machine

Read from SKILL.md and the folder at commit 9281472. 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

    No scripts in the folder and no shell commands in SKILL.md.

    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

Main Window Visualization loads about 1.2k tokens when it runs. Until then it costs about 66 tokens; SKILL.md has 477 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~66
When it runs · the whole SKILL.md, loaded when a task matches
~1.2k

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); files beside SKILL.md 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 477 words (~1,188 tokens).

“The main window's built-in visualization area (76×16 pixels in Winamp coordinates) supports twelve display modes. For per-mode shader/algorithm internals see gpu-vis-modes.”

— opening of SKILL.md by ad-repo, Custom licence
name
main-window-visualization

Read the full SKILL.md on GitHub

Files

Just SKILL.md in skills/main-window-visualization of ad-repo/nullplayer.

Open the folder on GitHubat commit 9281472

Compare with similar skills

Main Window Visualization 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.

Main Window Visualization compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Main Window Visualization this skillad-repo/nullplayer157—~1.2kAutomated safety check: PassCustom licence
Visualizeopenclaw/openclaw392k—~2.4kAutomated safety check: PassMIT
Visual Stylecalesthio/OpenMontage65k—~1.5kAutomated safety check: PassAGPL-3.0
D3 Visualizationnexu-io/open-design100k—~523Automated safety check: PassApache-2.0
Visual Regressionthedaviddias/Front-End-Checklist74k—~493Automated safety check: PassMIT
Worker Visualizernexu-io/open-design100k—~998Automated safety check: PassApache-2.0

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More from ad-repo/nullplayer

All 39 skills in this repo
  • Skin Screenshots

    ad-repo/nullplayer

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

    157 GitHub stars~1.9k tokensUpdated today
    Auto-check passed
  • Vis Classic Guide

    ad-repo/nullplayer

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

    157 GitHub stars~739 tokensUpdated today
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  • App Control

    ad-repo/nullplayer

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

    157 GitHub stars~9k tokensUpdated today
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  • Chromecast Casting

    ad-repo/nullplayer

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

    157 GitHub stars~4.6k tokensUpdated today
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  • Emby Integration

    ad-repo/nullplayer

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

    157 GitHub stars~2.7k 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.

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

Questions about Main Window Visualization

What does Main Window Visualization do?

The main window's built-in 76×16 (Winamp coordinates) visualization area — twelve display modes, mode switching, persistence, per-mode settings, and embedded renderer lifecycles. Main Window Visualization is an agent skill from ad-repo/nullplayer. The main window's built-in 76×16 (Winamp coordinates) visualization area — twelve display modes, mode switching, persistence, per-mode settings, and embedded renderer lifecycles.

When should I use Main Window Visualization?

Main Window Visualization fits situations like: modifying the in-skin visualizer area.

How do I install Main Window Visualization in Claude Code?

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

How do I install Main Window Visualization in Codex?

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

Can I use Main Window Visualization 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 main-window-visualization -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/main-window-visualization, .gemini/skills/main-window-visualization, .github/skills/main-window-visualization and .opencode/skills/main-window-visualization in your project.

What does Main Window Visualization need to run?

SKILL.md names no scripts, command-line tools or credentials: Main Window Visualization is instructions for the agent only.

Does Main Window Visualization 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 Main Window Visualization 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. Review the folder before installing.

What licence does Main Window Visualization use?

Main Window Visualization 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 Main Window Visualization use?

About 1.2k tokens (SKILL.md is roughly 4.8k 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 Main Window Visualization?

Skills that share tags, products or a category with Main Window Visualization: Visualize (openclaw/openclaw, 392k stars), Visual Style (calesthio/OpenMontage, 65k stars), D3 Visualization (nexu-io/open-design, 100k stars) and Visual Regression (thedaviddias/Front-End-Checklist, 74k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Main Window Visualization?

ad-repo (a GitHub user) maintains it in ad-repo/nullplayer, which has 157 GitHub stars. The repository holds 39 skills in this directory. The repository was last updated on October 8, 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.