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/masayan1126/masayan-uni-code-plugins/developnpx skills add masayan1126/masayan-uni-code-plugins --skill developgit clone --depth 1 https://github.com/masayan1126/masayan-uni-code-pluginsWhat 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 | $0.00208 |
| Opus 5 | $0.00024 | $0.00104 |
| Sonnet 5 | $0.00010 | $0.00042 |
| Haiku 4.5 | $0.00005 | $0.00021 |
Grade A, and why
chrome-ext-develop 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 yesterday.
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
Chrome Extension Development Skill
Chrome拡張機能の開発から、Chrome Web Storeへの申請準備までを一貫してサポートするスキルです。
対応タスク
- 新規Chrome拡張機能の開発
- 競合調査と要件定義
- ストア申請用アセット（説明文、画像仕様）の作成
関連ファイル
- WORKFLOW.md - 開発ワークフロー
- TEMPLATES.md - テンプレート集
- REFERENCE.md - 技術リファレンス
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.
- yesterday First seen · 21 lines · 48 tokens per session scan A 37800f6f229e
chrome-ext-develop is a skill published in the GitHub repository masayan1126/masayan-uni-code-plugins (5 stars, last pushed 5mo ago), licensed MIT. It adds 48 tokens to every session and 208 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 2026-08-31.
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