What is skin-subsystem-blueprint?

A design and implementation guide for adding or extending families of application skins. It explains which shared-code areas a new family must use, how to isolate it, and how to organise its tests, reference files, skills, and backlog.

Use it when starting a new skin family or extending support for formats such as Classic, Winamp, Windows Media Player, or VLC skins.

It gives developers a common structure for adding skin formats without overlooking shared code or supporting materials.

skin-subsystem-blueprint — Skill for Claude Code and Codex by ad-repo

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add ad-repo/nullplayer --skill skin-subsystem-blueprint

Clone the repo

git clone --depth 1 https://github.com/ad-repo/nullplayer

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/ad-repo/nullplayer/skin-subsystem-blueprint/github.svg)](https://agentmods.dev/skills/ad-repo/nullplayer/skin-subsystem-blueprint)

Your own site

<a href="https://agentmods.dev/skills/ad-repo/nullplayer/skin-subsystem-blueprint"><img src="https://agentmods.dev/badge/skills/ad-repo/nullplayer/skin-subsystem-blueprint/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/ad-repo/nullplayer/skin-subsystem-blueprint"><img src="https://agentmods.dev/badge/skills/ad-repo/nullplayer/skin-subsystem-blueprint.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 114 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 6,733 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin unknown No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00114	$0.06733
Opus 5.5	$0.00046	$0.02693
Sonnet 5.5	$0.00023	$0.01347
Haiku 4.5	$0.00011	$0.00673

Measured 3d ago against content hash e3bbe5fa4bc2, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

skin-subsystem-blueprint scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/skin-subsystem-blueprint/SKILL.md · 383 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

3d ago Changed · +9 lines e3bbe5fa4bc2
11d ago Changed · +20 lines · +10 tokens per session 472160051655
27d ago Changed · +5 lines 02f9f62d1e4c
28d ago Changed · +5 lines 1d98d9baca3c
1mo ago Changed 142310472a5c
1mo ago First seen · 344 lines · 104 tokens per session scan A 92aafe97537e

Subscribe to this mod's changes

skin-subsystem-blueprint is a skill published in the GitHub repository ad-repo/nullplayer (178 stars, last pushed yesterday), with no licence file. It adds 114 tokens to every session and 6,733 once invoked, about $0.0005 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-27.

Planning

skin-subsystem-blueprint next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
skin-subsystem-blueprintad-repo/nullplayer	Skill	178	yesterday	none	A	114	Claude Code, Codex
imagegenopenai/codex	Skill	133k	yesterday	Apache-2.0	A	113	Codex
playwright-climicrosoft/playwright	Skill	99k	yesterday	Apache-2.0	A	19	Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginners	Skill	79k	4d ago	MIT	A	200	Claude Code, Codex
systematic-debuggingobra/superpowers	Skill	313k	3d ago	MIT	A	21	Claude Code
next-cache-components-adoptionvercel/next.js	Skill	143k	today	MIT	A	95	Claude Code
next-partial-prefetching-adoptionvercel/next.js	Skill	143k	today	MIT	A	103	Claude Code