create-bitfun-skin

create-bitfun-skin is a skill for Claude Code, Codex from GCWing/BitFun. It costs 86 tokens per session (1,411 once invoked), scanned A, original, MIT.

A guide for creating and checking BitFun Appearance skin packages, which are small files that change the look of BitFun's interface. It explains which visual parts can be changed and how those changes are represented.

In plain words
What is it for?
Use it to discover available scenes and components, create or repair a sparse skin package, configure renderer settings, and validate imports or generated video and WebP files.
Why use it?
It helps prevent skins from using unsupported settings or failing when imported. It also gives a way to diagnose package and media problems.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/gcwing/bitfun/create-bitfun-skin
Any agent
npx skills add GCWing/BitFun --skill create-bitfun-skin
Clone the repo
git clone --depth 1 https://github.com/GCWing/BitFun

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.

agentmods badge for create-bitfun-skin

README.md
[![agentmods](https://agentmods.dev/badge/skills/gcwing/bitfun/create-bitfun-skin.svg)](https://agentmods.dev/skills/gcwing/bitfun/create-bitfun-skin)
Your own site
<a href="https://agentmods.dev/skills/gcwing/bitfun/create-bitfun-skin"><img src="https://agentmods.dev/badge/skills/gcwing/bitfun/create-bitfun-skin.svg" alt="Measured on agentmods" height="20"></a>
Per session 86 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,411 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original 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.

ModelPer sessionOnce invoked
Fable 5 $0.00086 $0.01411
Opus 5 $0.00043 $0.00705
Sonnet 5 $0.00017 $0.00282
Haiku 4.5 $0.00009 $0.00141

Measured 3d ago against content hash 2d5ae0dae750, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

create-bitfun-skin 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.

The scan reads SKILL.md. This mod also ships 11 executable files (examples/cinematic-animated-wallpaper/scripts/build_assets.py, examples/cinematic-animated-wallpaper/scripts/build_cinematic_skin.py, examples/cinematic-animated-wallpaper/scripts/cinematic_recipe.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

src/crates/assembly/core/builtin_skills/create-bitfun-skin/SKILL.md · 117 lines

How it starts

The opening of the file, as written. The whole thing — 117 lines — stays where its author put it; the contents beside it link to each section on GitHub.

BitFun Appearance Authoring

Use this Skill as the authority for what a BitFun skin may change and how that change is represented. Let the user's assets, product direction, and the selected example determine the visual design.

The bundled registry and package references define capabilities. Files under examples/ define optional style choices; they never expand the contract or prescribe coverage for another skin.

Route the task

  • For a new or repaired package, read authoring-workflow.md and package-contract.md.
  • For renderer configuration, also read renderer-contracts.md.
  • For generated video or WebP assets, also read media-quality-policy.md.
  • For a style-specific design, load only the closest example after reading the parent workflow.
  • For import failures, inspect the issue path, query that surface, and repair the sparse manifest instead of copying another package.
  • For BitFun contract changes, synchronize the registry before changing examples or skins.

Discover the exposed surface

Run commands from this Skill directory:

python scripts/bitfun_appearance.py contract list components
python scripts/bitfun_appearance.py contract list scenes
python scripts/bitfun_appearance.py contract list renderers
python scripts/bitfun_appearance.py contract show components <component-id>
python scripts/bitfun_appearance.py contract show scenes <scene-id>
python scripts/bitfun_appearance.py contract properties
python scripts/bitfun_appearance.py contract tokens css
python scripts/bitfun_appearance.py contract tokens widget

Only author registered surfaces, Parts, facets, states, renderer adapters, tokens, and Style IR properties returned by these commands. A Part descriptor may further restrict its allowed properties.

A component owns only the Parts returned for that component. Nested visual owners expose their own component ids and must be styled through those ids. Do not infer Parts from DOM structure, another skin, or an example surface plan.

Read the full file on GitHub · 117 lines

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.

  1. 3d ago First seen · 117 lines · 86 tokens per session scan A 2d5ae0dae750

Subscribe to this mod's changes

create-bitfun-skin is a skill published in the GitHub repository GCWing/BitFun (1,871 stars, last pushed 3d ago), licensed MIT. It adds 86 tokens to every session and 1,411 once invoked, about $0.0004 per session on Opus 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 2026-08-30.

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