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 rules/chachamaru127/claude-code-harness/skill-subagent-usagegit clone --depth 1 https://github.com/Chachamaru127/claude-code-harnessWhat 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 | $0.00230 | $0.00230 |
| Opus 5 | $0.00115 | $0.00115 |
| Sonnet 5 | $0.00046 | $0.00046 |
| Haiku 4.5 | $0.00023 | $0.00023 |
Grade A, and why
skill-subagent-usage 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 3d 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
Skill と Subagent を積極活用する
使い分け
- Skill: 専門知識が必要なタスク → 作業開始前に
SKILL.mdを読み、手順/制約をそのまま適用する。宣言だけで終わらせない。 - Subagent: 独立コンテキストが有効なタスク（リファクタリング・レビュー・広範囲探索など）、または並列実行したい場合に委任する。
※ 両者は併用可。Skill の知識を Subagent に渡して実行することもある。 ※ 小さいタスクで該当する Skill/Subagent がない場合は、通常フローで進める。
利用時は明示
使用する Skill/Subagent と理由は1行で明記してから進める。
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.
- 3d ago First seen · 19 lines · 230 tokens per session scan A 4c37cfd57b6d
skill-subagent-usage is a cursor rule published in the GitHub repository Chachamaru127/claude-code-harness (3,079 stars, last pushed 2d ago), licensed MIT. It adds 230 tokens to every session, about $0.0011 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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