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-unity-mcpgit 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-unity-mcp)<a href="https://agentmods.dev/skills/sechiro/vrcudonskills-for-codex/vrc-udon-unity-mcp"><img src="https://agentmods.dev/badge/skills/sechiro/vrcudonskills-for-codex/vrc-udon-unity-mcp/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-unity-mcp"><img src="https://agentmods.dev/badge/skills/sechiro/vrcudonskills-for-codex/vrc-udon-unity-mcp.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 | $0.00096 | $0.00800 |
| Opus 5.5 | $0.00038 | $0.00320 |
| Sonnet 5.5 | $0.00019 | $0.00160 |
| Haiku 4.5 | $0.00010 | $0.00080 |
Grade A, and why
vrc-udon-unity-mcp 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 Unity MCP
役割
Unity 2022.3.22f1 を使う VRChat UdonSharp 案件で、unity-mcp を Editor 支援として安全に扱う。Scene、Prefab、Builder、Package、Editor 状態の確認や補助操作に使い、Runtime の設計責務とは分離する。
この Skill を使う場面
- プロジェクトが
CoplayDev/unity-mcpを導入している - Unity Editor 上の Scene / Prefab / Builder 状態を Codex から読みたい
- Builder First の補助として Editor 側の状態確認や操作支援を使いたい
- Unity 2022.3.22f1 前提で、導入方法と利用範囲も文書化したい
この Skill を使わない場面
unity-mcpを導入していない- Runtime 実装や UdonSharp コードだけで完結する
- モジュール構造だけ整理したい
前提
- Unity バージョンは
2022.3.22f1 unity-mcpは Runtime 依存ではなく Editor 支援ツールとして扱う- Scene / Prefab / Builder / Editor 設定の読解と補助に使う
- 接続先は導入先プロジェクト直下の
.mcp.jsonに書く - 実装や仕様の正本は project-owned 文書とコード側に残す
進め方
references/unity-mcp-install-and-scope.mdを読む。references/unity-mcp-usage-rules.mdを読む。- Unity が
2022.3.22f1であることを確認する。 - 導入先プロジェクト直下に
.mcp.jsonを置き、接続先を書く。 - 導入先の
docs/ENVIRONMENT_SETUP.mdやdocs/SYSTEM_SPEC.mdに、導入方法と利用範囲を書く。 - Scene / Prefab / Builder の確認補助に使う。
- Unity MCP で得た結果は Builder、コード、project-owned 文書へ反映して再現可能にする。
併用ガイド
- 文書と環境再現は
$vrc-udon-project-docs - モジュール構造は
$vrc-udon-core-module - UI と操作導線は
$vrc-udon-ui-menu - networking 文書は
$vrc-udon-networking-rules
注意点
unity-mcpを Runtime 依存として扱わない- Unity Editor 上で見えた状態を、そのままワールド実行時の保証とみなさない
.mcp.jsonの接続先は project root に置き、案件ごとに管理する- 導入方法、利用範囲、無効化条件を project-owned 文書へ残す
- Unity バージョン差がある前提で扱う
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 · 57 lines · 96 tokens per session scan A ed9cb966710b
vrc-udon-unity-mcp is a skill published in the GitHub repository sechiro/VRCUdonSkills-for-Codex (58 stars, last pushed 6mo ago), licensed MIT. It adds 96 tokens to every session and 800 once invoked, about $0.0004 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-unity-mcp compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| vrc-udon-unity-mcpsechiro/VRCUdonSkills-for-Codex | Skill | 58 | 6mo ago | MIT | A | 96 | 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 |