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 sechiro/VRCUdonSkills-for-Codex --skill vrc-udon-core-modulegit clone --depth 1 https://github.com/sechiro/VRCUdonSkills-for-CodexWrote 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/sechiro/vrcudonskills-for-codex/vrc-udon-core-module)<a href="https://agentmods.dev/skills/sechiro/vrcudonskills-for-codex/vrc-udon-core-module"><img src="https://agentmods.dev/badge/skills/sechiro/vrcudonskills-for-codex/vrc-udon-core-module/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/sechiro/vrcudonskills-for-codex/vrc-udon-core-module"><img src="https://agentmods.dev/badge/skills/sechiro/vrcudonskills-for-codex/vrc-udon-core-module.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00130 | $0.00704 |
| Opus 5.5 | $0.00052 | $0.00282 |
| Sonnet 5.5 | $0.00026 | $0.00141 |
| Haiku 4.5 | $0.00013 | $0.00070 |
Grade A, and why
vrc-udon-core-module 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 2mo 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
VRC Udon Core Module
役割
VRChat UdonSharp の再利用可能な基本モジュールを組み立てる。特に Builder First、Runtime / Editor 分離、project-owned な仕様書整備を前提にした初期構成を作る。
この Skill を最初に使う場面
- 新しい UdonSharp モジュールを切り出す
- Builder と Runtime の責務を分けたい
- 外部プロジェクトへ持ち出せる基本骨格を作りたい
この Skill を使わない場面
- 文書雛形だけを先に配りたい場合:
vrc-udon-project-docs - ネットワーク仕様だけを決めたい場合:
vrc-udon-networking-rules - Persistence の方式選定だけをしたい場合:
vrc-udon-persistence-sync
進め方
- 最初に
references/core-rules.mdを読む。 - Builder を含む構成を作る場合は
references/module-workflow.mdも読む。 - まず責務を分ける。
- Runtime は
Scripts/またはRuntime/ - Editor 拡張は
Editor/ - プロジェクト固有仕様は
docs/
- Runtime は
- 導入先に基本文書が無い場合は
$vrc-udon-project-docsを併用する。 - Sync、Ownership、Network Event、Late Joiner、Persistence が絡む場合は
$vrc-udon-networking-rulesを併用する。 - Builder First を維持する。
- Runtime の UdonSharpBehaviour は小さく保つ。
- 他プロジェクトへ配布する前提でも、プロジェクト固有要件は project-owned ドキュメントに逃がす。
担当範囲
- モジュールの基本構成決定
- Builder の責務分離
- Runtime の責務分離
- 文書の最低ライン整理
- 外部プロジェクトへ持ち出す前提の骨格化
担当しない範囲
- Udon の個別ロジックを詳細実装すること
- Unity MCP など個別機能の Runtime 実装を直接決め打ちすること
- imported 資料の永続運用を常設前提にすること
- ネットワーク仕様を単独で確定すること
What ships with it
3 files 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.
- 2mo ago First seen · 52 lines · 130 tokens per session scan A 1a0cc16fd516
vrc-udon-core-module is a skill published in the GitHub repository sechiro/VRCUdonSkills-for-Codex (58 stars, last pushed 6mo ago), licensed MIT. It adds 130 tokens to every session and 704 once invoked, about $0.0005 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 2026-08-30.
vrc-udon-core-module compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| vrc-udon-core-modulesechiro/VRCUdonSkills-for-Codex | Skill | 58 | 6mo ago | MIT | A | 130 | Codex |
| playtest-reportDonchitos/Claude-Code-Game-Studios | Skill | 36k | 18d ago | MIT | A | 20 | Claude Code |
| godot-signals-groupsgamedev-skills/awesome-gamedev-agent-skills | Skill | 6.9k | 9d ago | Apache-2.0 | A | 95 | Claude Code |
| scenario-unreal-gameplayscenario-labs/skills | Skill | 3.2k | yesterday | MIT | A | 121 | Claude Code |
| motionOpenDCAI/GameFactory-3A | Skill | 1.0k | 8d ago | Apache-2.0 | A | 0 | Claude Code, Codex |
| unity-addressablesBesty0728/Unity-Skills | Skill | 1.9k | yesterday | MIT | A | 25 | Claude Code, Codex |
| unity-manual-componentBesty0728/Unity-Skills | Skill | 1.9k | yesterday | MIT | A | 36 | Claude Code, Codex |