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Agent skill

Skin Subsystem Blueprint

by ad-repo in ad-repo/nullplayer

How to add or extend a skin family (Classic, Original, Winamp Modern .wal, Windows Media Player .wmz, and the VLC family next) — the shared-code seams a new family must touch, the isolation rules…

Custom licenceAuto-check passed

Install Skin Subsystem Blueprint

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

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

GitHub CLI
$ gh skill install ad-repo/nullplayer skin-subsystem-blueprint --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-subsystem-blueprint .claude/skills/skin-subsystem-blueprint && 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-subsystem-blueprint
GitHub stars
158
Token cost
~6.3k tokens
SKILL.md length
3,554 words
Files
1
Skills in repo
40
Repo updated
First seen
Licence
Custom licence

At a glance

How to add or extend a skin family (Classic, Original, Winamp Modern .wal, Windows Media Player .wmz, and the VLC family next) — the shared-code seams a new family must touch, the isolation rules…

  • Works in 5 steps: A corpus location outside the repo… → Probe flags, all #if DEBUG, all read… → A census (one structural row per input,… → …
  • Starting a new skin engine
  • SKILL.md covers The rule that outranks…, Prefer an enum the compiler…, The shared-code seams and Isolation, plus 6 more sections
  • Calls git

What it does

Skin Subsystem Blueprint is an agent skill from ad-repo/nullplayer. How to add or extend a skin family (Classic, Original, Winamp Modern .wal, Windows Media Player .wmz, and the VLC family next) — the shared-code seams a new family must touch, the isolation rules, the harness and corpus pattern, and the skill/backlog layout every family is expected to produce. Use when starting a new skin engine, reviewing a change that touches PlayerUIMode or WindowManager routing, or deciding where a new subsystem's documentation goes.

Its SKILL.md is about 6.3k 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

  • Starting a new skin engine
  • Reviewing a change that touches PlayerUIMode
  • WindowManager routing
  • Deciding where a new subsystems documentation goes

Example prompts

  • “/skin-subsystem-blueprint”

Workflow steps

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

  1. A corpus location outside the repo (~/Library/Application Support/NullPlayer/Skins),
  2. Probe flags, all #if DEBUG, all read once at process start, each printing one machine-readable
  3. A census (one structural row per input, with a sha256 so duplicates are visible) and a
  4. A committed baseline the gate ratchets against, so a change is a diff rather than an
  5. A demand-driven backlog (_TASKS.md at the repo root, closed entries moved to

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

    Shell commands in SKILL.md call:

    • git

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

  • Network

    No URLs in SKILL.md. Its commands use git, which can reach the network depending on how they are called.

    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 Subsystem Blueprint loads about 6.3k tokens when it runs. Until then it costs about 121 tokens; SKILL.md has 3,554 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~121
When it runs · the whole SKILL.md, loaded when a task matches
~6.3k

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 3,554 words (~6,289 tokens).

“NullPlayer hosts several independent skin engines. Four exist — classic, nullPlayerModern (Original/Original-Metal), winampModern (.wal), wmp (.wmz) — and the pattern below is what the last two paid to discover. Follow it rather than re-deriving it.”

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

Read the full SKILL.md on GitHub

Files

Just SKILL.md in skills/skin-subsystem-blueprint of ad-repo/nullplayer.

Open the folder on GitHubat commit 3d87ce1

Compare with similar skills

Skin Subsystem Blueprint 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 Subsystem Blueprint compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Skin Subsystem Blueprint this skillad-repo/nullplayer158—~6.3kAutomated safety check: PassCustom licence
Blueprintaffaan-m/ECC277k2 repos~604Automated safety check: PassMIT
Blueprintaffaan-m/ECC276k—~421Automated safety check: PassMIT
Blueprintsickn33/agentic-awesome-skills47k2 repos~1kAutomated safety check: PassMIT
Blueprint Construction Planneraffaan-m/ECC277k5 repos~1.3kAutomated safety check: PassMIT
Skin Health Analyzersickn33/agentic-awesome-skills47k2 repos~293Automated safety check: PassMIT

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Questions about Skin Subsystem Blueprint

What does Skin Subsystem Blueprint do?

How to add or extend a skin family (Classic, Original, Winamp Modern .wal, Windows Media Player .wmz, and the VLC family next) — the shared-code seams a new family must touch, the isolation rules…. Skin Subsystem Blueprint is an agent skill from ad-repo/nullplayer.wmz, and the VLC family next) — the shared-code seams a new family must touch, the isolation rules, the harness and corpus pattern, and the skill/backlog layout every family is expected to produce.

When should I use Skin Subsystem Blueprint?

Skin Subsystem Blueprint fits situations like: starting a new skin engine; reviewing a change that touches PlayerUIMode; windowManager routing; deciding where a new subsystems documentation goes.

How do I install Skin Subsystem Blueprint in Claude Code?

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

How do I install Skin Subsystem Blueprint in Codex?

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

Can I use Skin Subsystem Blueprint 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-subsystem-blueprint -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-subsystem-blueprint, .gemini/skills/skin-subsystem-blueprint, .github/skills/skin-subsystem-blueprint and .opencode/skills/skin-subsystem-blueprint in your project.

What does Skin Subsystem Blueprint need to run?

Going by SKILL.md and its folder, Skin Subsystem Blueprint needs the command-line tools its instructions call (git).

Does Skin Subsystem Blueprint access the network?

SKILL.md contains no URLs. Its commands use git, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Skin Subsystem Blueprint 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 Skin Subsystem Blueprint use?

Skin Subsystem Blueprint 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 Subsystem Blueprint use?

About 6.3k tokens (SKILL.md is roughly 25k 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 Subsystem Blueprint?

Skills that share tags, products or a category with Skin Subsystem Blueprint: Blueprint (affaan-m/ECC, 277k stars), Blueprint (affaan-m/ECC, 276k stars), Blueprint (sickn33/agentic-awesome-skills, 47k stars) and Blueprint Construction Planner (affaan-m/ECC, 277k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Skin Subsystem Blueprint?

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.