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.
npx skills add frabcd/codex-ai-game-studio --skill art-biblegit clone --depth 1 https://github.com/frabcd/codex-ai-game-studioWrote 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.
[](https://agentmods.dev/skills/frabcd/codex-ai-game-studio/art-bible)<a href="https://agentmods.dev/skills/frabcd/codex-ai-game-studio/art-bible"><img src="https://agentmods.dev/badge/skills/frabcd/codex-ai-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.
<a href="https://agentmods.dev/skills/frabcd/codex-ai-game-studio/art-bible"><img src="https://agentmods.dev/badge/skills/frabcd/codex-ai-game-studio/art-bible.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00057 | $0.03509 |
| Opus 5 | $0.00028 | $0.01754 |
| Sonnet 5 | $0.00011 | $0.00702 |
| Haiku 4.5 | $0.00006 | $0.00351 |
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 10d 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.
How it starts
The opening of the file, as written. The whole thing — 252 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Port provenance: adapted from the pinned upstream source at
984023ddac0d5e27624f2baacde6105e45de375funder MIT; see the repository parity ledger for the exact path and blob.
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 the installed Codex role-gate protocol for the full check pattern.
Read design/gdd/game-concept.md. If it does not exist, fail with:
"No game concept found. Run
$ai-game-studio:brainstormfirst — 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: file discovery 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 .ai-game-studio/project.json if it exists — extract performance budgets and engine for asset standard constraints.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 10d ago First seen · 252 lines · 57 tokens per session scan A d53e2b840664
art-bible is a skill published in the GitHub repository frabcd/codex-ai-game-studio (10 stars, last pushed 3d ago), licensed MIT. It adds 57 tokens to every session and 3,509 once invoked, about $0.0003 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 2026-08-31.
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