Borrowing it
Nothing to install: this file belongs to Chachamaru127/codex-harness. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/Chachamaru127/codex-harness/main/.codex/skills/test-nested-agents/SKILL.mdgit clone --depth 1 https://github.com/Chachamaru127/codex-harnessWrote 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/chachamaru127/codex-harness/test-nested-agents)<a href="https://agentmods.dev/skills/chachamaru127/codex-harness/test-nested-agents"><img src="https://agentmods.dev/badge/skills/chachamaru127/codex-harness/test-nested-agents.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 5.1 | $0.00042 | $0.00490 |
| Opus 5 | $0.00021 | $0.00245 |
| Sonnet 5 | $0.00008 | $0.00098 |
| Haiku 4.5 | $0.00004 | $0.00049 |
Grade A, and why
test-nested-agents 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 6d 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
Test Nested Agents Skill
このスキルは {skill}/agents/ フォルダにエージェントをパッケージするパターンの検証用です。
テスト対象
- スキル内の
agents/フォルダにエージェントを配置 - Task tool でそのエージェントを呼び出せるか検証
含まれるテストエージェント
| エージェント | 目的 |
|---|---|
| test-echo-agent | 入力をエコーバックして動作確認 |
検証手順
パターン A: スキル内エージェントを直接参照
Task tool:
subagent_type: "test-echo-agent"
prompt: "Echo back: HELLO FROM NESTED AGENT"
パターン B: 相対パスでプロンプトを読み込み
1. Read: ./agents/test-echo-agent.md
2. そのプロンプトを使って Task tool で general-purpose を起動
実行
このスキルが起動したら、以下を順次実行：
- まず
agents/test-echo-agent.mdの内容を確認 - パターン A を試行
- パターン A が失敗したら パターン B を試行
- 結果をレポート
What ships with it
1 file 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.
- 6d ago First seen · 55 lines · 42 tokens per session scan A 89c3bff8fdcb
test-nested-agents is a skill published in the GitHub repository Chachamaru127/codex-harness (2 stars, last pushed 6mo ago), licensed MIT. It adds 42 tokens to every session and 490 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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