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 agentmods add skills/jackli12/codex-game-studio/define-game-conceptnpx skills add jackli12/codex-game-studio --skill define-game-conceptgit clone --depth 1 https://github.com/jackli12/codex-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/jackli12/codex-game-studio/define-game-concept)<a href="https://agentmods.dev/skills/jackli12/codex-game-studio/define-game-concept"><img src="https://agentmods.dev/badge/skills/jackli12/codex-game-studio/define-game-concept.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00048 | $0.00226 |
| Opus 5 | $0.00024 | $0.00113 |
| Sonnet 5 | $0.00010 | $0.00045 |
| Haiku 4.5 | $0.00005 | $0.00023 |
Grade A, and why
define-game-concept 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 5d 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.
What it actually says
Define Game Concept
目标
明确游戏是什么、面向谁，以及为什么这个体验值得玩。
何时使用
- 概念还比较模糊
- 核心钩子不够强
- 在写详细设计之前需要先把方向立住
工作流
- 明确目标用户
- 明确幻想感和玩法钩子
- 明确目标体验
- 把系统细化工作交给
game-designer
输出要求
- 目标用户
- 幻想感
- 玩法钩子
- 体验目标
- 下一步交接对象
参考资料
../shared/references/project-brief-template.md../shared/references/gameplay-loop-checklist.md
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.
- 5d ago First seen · 37 lines · 48 tokens per session scan A b26292485a39
define-game-concept is a skill published in the GitHub repository jackli12/codex-game-studio (12 stars, last pushed 3mo ago), licensed MIT. It adds 48 tokens to every session and 226 once invoked, about $0.0002 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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