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 create-storiesgit 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/create-stories)<a href="https://agentmods.dev/skills/frabcd/codex-ai-game-studio/create-stories"><img src="https://agentmods.dev/badge/skills/frabcd/codex-ai-game-studio/create-stories/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/create-stories"><img src="https://agentmods.dev/badge/skills/frabcd/codex-ai-game-studio/create-stories.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 | $0.00069 | $0.03737 |
| Opus 5.5 | $0.00028 | $0.01495 |
| Sonnet 5.5 | $0.00014 | $0.00747 |
| Haiku 4.5 | $0.00007 | $0.00374 |
Grade A, and why
create-stories 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 1mo 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 — 335 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.
Create Stories
A story is a single implementable behaviour — small enough to complete in one focused session, self-contained, and fully traceable to a GDD requirement and an ADR decision. Stories are what developers pick up. Epics are what architects define.
Run this skill per epic, not per layer. Run it for Foundation epics first, then Core, and so on — matching the dependency order.
Output: production/epics/[epic-slug]/story-NNN-[slug].md files
Previous step: $ai-game-studio:create-epics [system]
Next step after stories exist: $ai-game-studio:story-readiness [story-path] then $ai-game-studio:dev-story [story-path]
1. Parse Argument
Extract --review [full|lean|solo] if present and store as the review mode
override for this run. If not provided, read production/review-mode.txt
(default lean if missing). This resolved mode applies to all gate spawns
in this skill — apply the check pattern from the installed Codex role-gate protocol
before every gate invocation.
$ai-game-studio:create-stories [epic-slug]— e.g.$ai-game-studio:create-stories combat$ai-game-studio:create-stories production/epics/combat/EPIC.md— full path also accepted- No argument — ask: "Which epic would you like to break into stories?"
file discovery
production/epics/*/EPIC.mdand list available epics with their status.
2. Load Everything for This Epic
Read in full:
production/epics/[epic-slug]/EPIC.md— epic overview, governing ADRs, GDD requirements table- The epic's GDD (
design/gdd/[filename].md) — read all 8 sections, especially Acceptance Criteria, Formulas, and Edge Cases - All governing ADRs listed in the epic — read the Decision, Implementation Guidelines, Engine Compatibility, and Engine Notes sections
docs/architecture/control-manifest.md— extract rules for this epic's layer; note the Manifest Version date from the headerdocs/architecture/tr-registry.yaml— load all TR-IDs for this system
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.
- 1mo ago First seen · 335 lines · 69 tokens per session scan A 08b2a27189a2
create-stories is a skill published in the GitHub repository frabcd/codex-ai-game-studio (17 stars, last pushed 5d ago), licensed MIT. It adds 69 tokens to every session and 3,737 once invoked, about $0.0003 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 2026-08-31.
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