A guided workflow for writing an art bible, a document that defines a game's visual identity and rules for producing its artwork. It checks the approved game concept before authoring the document.

Use it to define a game's visual statement, color palette, lighting, and other art-direction sections after brainstorming has been approved.

It keeps visual decisions tied to an approved game idea and provides review gates before later design and asset work begins.

art-bible — Skill for Claude Code by IdoCohen560

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 IdoCohen560/claude-unity-game-studio --skill art-bible

Clone the repo

git clone --depth 1 https://github.com/IdoCohen560/claude-unity-game-studio

Made for: Claude Code.

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/idocohen560/claude-unity-game-studio/art-bible/github.svg)](https://agentmods.dev/skills/idocohen560/claude-unity-game-studio/art-bible)

Your own site

<a href="https://agentmods.dev/skills/idocohen560/claude-unity-game-studio/art-bible"><img src="https://agentmods.dev/badge/skills/idocohen560/claude-unity-game-studio/art-bible/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/idocohen560/claude-unity-game-studio/art-bible"><img src="https://agentmods.dev/badge/skills/idocohen560/claude-unity-game-studio/art-bible.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 47 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,313 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 98% copy Near-identical to another mod 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	$0.00047	$0.03313
Opus 5	$0.00023	$0.01656
Sonnet 5	$0.00009	$0.00663
Haiku 4.5	$0.00005	$0.00331

Measured 11d ago against content hash 912e36b7f6cd, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

art-bible 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 11d 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.

Origin

This is a copy

98% identical to art-bible — 1 line differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

examples/my-first-game/.claude/skills/art-bible/SKILL.md · 249 lines

How it starts

The opening of the file, as written. The whole thing — 249 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Phase 0: Parse Arguments and Context Check

Resolve the review mode (once, store for all gate spawns this run):

If --review [full|lean|solo] was passed → use that
Else read production/review-mode.txt → use that value
Else → default to lean

See .claude/docs/director-gates.md for the full check pattern.

Read design/gdd/game-concept.md. If it does not exist, fail with:

"No game concept found. Run /brainstorm first — the art bible is authored after the game concept is approved."

Extract from game-concept.md:

Game title (working title)
Core fantasy and elevator pitch
Game pillars (all of them)
Visual Identity Anchor section if present (from brainstorm Phase 4 art-director output)
Target platform (if noted)

Retrofit mode detection: Glob design/art/art-bible.md. If the file exists:

Read it in full
For each of the 9 sections, check whether the body contains real content (more than a [To be designed] placeholder or similar) vs. is empty/placeholder
Build a section status table:

Section | Status
--------|--------
1. Visual Identity Statement | [Complete / Empty / Placeholder]
2. Color Palette | ...
3. Lighting & Atmosphere | ...
4. Character Art Direction | ...
5. Environment & Level Art | ...
6. UI Visual Language | ...
7. VFX & Particle Style | ...
8. Asset Standards | ...
9. Style Prohibitions | ...

Present this table to the user:

"Found existing art bible at design/art/art-bible.md. [N] sections are complete, [M] need content. I'll work on the incomplete sections only — existing content will not be touched."
Only work on sections with Status: Empty or Placeholder. Do not re-author sections that are already complete.

If the file does not exist, this is a fresh authoring session — proceed normally.

Read .claude/docs/technical-preferences.md if it exists — extract performance budgets and engine for asset standard constraints.

Phase 1: Framing

Present the session context and ask two questions before authoring anything:

Read the full file on GitHub · 249 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.

11d ago First seen · 249 lines · 47 tokens per session scan A 912e36b7f6cd

Subscribe to this mod's changes

art-bible is a skill published in the GitHub repository IdoCohen560/claude-unity-game-studio (19 stars, last pushed 2mo ago), licensed MIT. It adds 47 tokens to every session and 3,313 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 98% identical to art-bible, differing in 1 line, and is treated as a copy.

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