Agent skill

UI Guide

Coordinate systems, scaling architecture, hit testing, skin sprite rendering, window layout, and Compact Mode for NullPlayer's UI.

Custom licenceAuto-check passed

Install UI Guide

skills CLI

$ npx skills add ad-repo/nullplayer --skill ui-guide -a claude-code

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

GitHub CLI

$ gh skill install ad-repo/nullplayer ui-guide --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/ui-guide .claude/skills/ui-guide && 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/

Paste into Claude Code

Install the "ui-guide" agent skill from https://github.com/ad-repo/nullplayer/tree/main/skills/ui-guide into .claude/skills/ui-guide/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ui-guide", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/ad-repo/nullplayer/tree/main/skills/ui-guide

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add ad-repo/nullplayer --skill ui-guide -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install ad-repo/nullplayer ui-guide --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/ad-repo/nullplayer.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/ui-guide .agents/skills/ui-guide && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "ui-guide" agent skill from https://github.com/ad-repo/nullplayer/tree/main/skills/ui-guide into .agents/skills/ui-guide/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ui-guide", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add ad-repo/nullplayer --skill ui-guide -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install ad-repo/nullplayer ui-guide --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/ad-repo/nullplayer.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/ui-guide .cursor/skills/ui-guide && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "ui-guide" agent skill from https://github.com/ad-repo/nullplayer/tree/main/skills/ui-guide into .cursor/skills/ui-guide/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ui-guide", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/ad-repo/nullplayer.git --path skills/ui-guide

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add ad-repo/nullplayer --skill ui-guide -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install ad-repo/nullplayer ui-guide --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/ad-repo/nullplayer.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/ui-guide .gemini/skills/ui-guide && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "ui-guide" agent skill from https://github.com/ad-repo/nullplayer/tree/main/skills/ui-guide into .gemini/skills/ui-guide/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ui-guide", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install ad-repo/nullplayer ui-guide

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add ad-repo/nullplayer --skill ui-guide -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/ad-repo/nullplayer.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/ui-guide .github/skills/ui-guide && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "ui-guide" agent skill from https://github.com/ad-repo/nullplayer/tree/main/skills/ui-guide into .github/skills/ui-guide/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ui-guide", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add ad-repo/nullplayer --skill ui-guide -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install ad-repo/nullplayer ui-guide --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/ad-repo/nullplayer.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/ui-guide .opencode/skills/ui-guide && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "ui-guide" agent skill from https://github.com/ad-repo/nullplayer/tree/main/skills/ui-guide into .opencode/skills/ui-guide/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ui-guide", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: ui-guide
GitHub stars: 158
Token cost: ~24k tokens
SKILL.md length: 12,089 words
Files: 1
Skills in repo: 40
Repo updated: Oct 10, 2026
First seen: Oct 7, 2026
Licence: Custom licence

At a glance

Coordinate systems, scaling architecture, hit testing, skin sprite rendering, window layout, and Compact Mode for NullPlayer's UI.

Works in 4 steps: Shared non-UI logic in a neutral folder… → Classic chrome in Windows/... → Modern chrome in Windows/Modern... → …
Working on window scaling
SKILL.md covers Coordinate Systems, Scaling Architecture, Hit Testing (Scaling Mode) and Skin File Structure, plus 11 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

UI Guide is an agent skill from ad-repo/nullplayer. Coordinate systems, scaling architecture, hit testing, skin sprite rendering, window layout, and Compact Mode for NullPlayer's UI. Use when working on window scaling, skin rendering, coordinate transforms, visual layout, compact/status-item windows, or playlist/marquee text rendering.

Its SKILL.md is about 24k 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

Working on window scaling
Coordinate transforms
Compact/status-item windows
Playlist/marquee text rendering

Example prompts

“/ui-guide”

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

Shared non-UI logic in a neutral folder (for example Waveform/)
Classic chrome in Windows/...
Modern chrome in Windows/Modern...
Registration and docking behavior in WindowManager

What it can do on your machine

Read from SKILL.md and the folder at commit 3d87ce1. 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 (its code samples are swift).
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
- skins.webamp.org
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

UI Guide loads about 24k tokens when it runs. Until then it costs about 74 tokens; SKILL.md has 12,089 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~74
When it runs · the whole SKILL.md, loaded when a task matches: ~24k

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 12,089 words (~24,211 tokens).

“Reference for working on NullPlayer's skin-style UI and skin system.”

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

name: ui-guide

Outline of SKILL.md

UI & Skin Rendering Guide
Coordinate Systems
Scaling Architecture
Scaling Mode (Main Window, EQ)
Stretch Expansion Mode (Playlist, Spectrum, Waveform)
Hit Testing (Scaling Mode)
Skin File Structure
BMP Parsing
Sprite Drawing
Classic Time Display
Tile-Aligned Widths
Classic Playlist-Style Window Chrome
Menu Bar Integration (AppKit)
Dockable Center-Stack Windows
Window Dragging (MUST)
Library Window Position Memory
Custom Sprites
Classic EQ Skin Art
Playlist Text Rendering
Implementation
Marquee Scrolling
Unicode Fallback
Selected Track Appearance
Auto-Selection
Cross-Window Interference Prevention
Main Window Marquee
Skin Bitmap Font
Unicode Fallback
White Text Rendering
Implementation

Read the full SKILL.md on GitHub

Files

Just SKILL.md in skills/ui-guide of ad-repo/nullplayer.

Open the folder on GitHubat commit 3d87ce1

Compare with similar skills

UI Guide 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.

UI Guide compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
UI Guide this skillad-repo/nullplayer	158	—	~24k	Automated safety check: Pass	Custom licence	today
Agent Adaptive Coordinatorruvnet/ruflo	74k	2 repos	~4k	Automated safety check: Pass	MIT	today
Agent Consensus Coordinatorruvnet/ruflo	74k	2 repos	~3.2k	Automated safety check: Pass	MIT	today
Agent Hierarchical Coordinatorruvnet/ruflo	74k	2 repos	~2.8k	Automated safety check: Pass	MIT	today
Agent Memory Coordinatorruvnet/ruflo	74k	2 repos	~1.2k	Automated safety check: Pass	MIT	today
Agent Mesh Coordinatorruvnet/ruflo	74k	2 repos	~3.2k	Automated safety check: Pass	MIT	today

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Auto-check passed

Questions about UI Guide

What does UI Guide do?

Coordinate systems, scaling architecture, hit testing, skin sprite rendering, window layout, and Compact Mode for NullPlayer's UI. UI Guide is an agent skill from ad-repo/nullplayer. Coordinate systems, scaling architecture, hit testing, skin sprite rendering, window layout, and Compact Mode for NullPlayer's UI.

When should I use UI Guide?

UI Guide fits situations like: working on window scaling; coordinate transforms; compact/status-item windows; playlist/marquee text rendering.

How do I install UI Guide in Claude Code?

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

How do I install UI Guide in Codex?

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

Can I use UI Guide 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 ui-guide -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/ui-guide, .gemini/skills/ui-guide, .github/skills/ui-guide and .opencode/skills/ui-guide in your project.

What does UI Guide need to run?

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

Does UI Guide access the network?

SKILL.md names 1 domain. As links in the text: skins.webamp.org. This is read from the text; nothing was executed.

Is UI Guide 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 UI Guide use?

UI Guide 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 UI Guide use?

About 24k tokens (SKILL.md is roughly 97k 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 UI Guide?

Skills that share tags, products or a category with UI Guide: Agent Adaptive Coordinator (ruvnet/ruflo, 74k stars), Agent Consensus Coordinator (ruvnet/ruflo, 74k stars), Agent Hierarchical Coordinator (ruvnet/ruflo, 74k stars) and Agent Memory Coordinator (ruvnet/ruflo, 74k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains UI Guide?

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 10, 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.

UI Guide

Install UI Guide

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Files

Compare with similar skills

Similar skills

Agent Adaptive Coordinator

Agent Consensus Coordinator

Agent Hierarchical Coordinator

Agent Memory Coordinator

Agent Mesh Coordinator

Agent Queen Coordinator

More from ad-repo/nullplayer

Skin Screenshots

Vis Classic Guide

App Control

Chromecast Casting

Emby Integration

Live UI Testing

Questions about UI Guide