Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add reatcat/l123-harness/plugin install l123-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/reatcat/l123-harness/init-harness)<a href="https://agentmods.dev/skills/reatcat/l123-harness/init-harness"><img src="https://agentmods.dev/badge/skills/reatcat/l123-harness/init-harness/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/reatcat/l123-harness/init-harness"><img src="https://agentmods.dev/badge/skills/reatcat/l123-harness/init-harness.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 | $0.00095 | $0.00697 |
| Opus 5 | $0.00048 | $0.00349 |
| Sonnet 5 | $0.00019 | $0.00139 |
| Haiku 4.5 | $0.00010 | $0.00070 |
Grade A, and why
init-harness scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Init Harness —— 装机程序
把 L1-L2-L3 方法论骨架装进当前项目。骨架是引擎生成的数据：装完后项目自己积累知识，插件不再参与。
步骤
1. 前置检查
- 确认当前工作目录就是目标项目根（用户没指定就用 cwd）。
- 如果项目已有
CLAUDE.md或.agents/，不要覆盖：脚本本身永不覆盖已存在文件，但你要先看一眼现状，向用户说明哪些会新建、哪些会跳过。
2. 执行装机脚本
bash "${CLAUDE_PLUGIN_ROOT}/skills/init-harness/init.sh" "<项目根绝对路径>"
脚本会创建（不覆盖）：
CLAUDE.md—— L1 常驻层模板.agents/INDEX.md—— L2 索引模板.agents/gate.conf—— 门禁保护清单.agents/{current,inbox,events,knowledge,pitfalls,runbooks,templates,archive}/.agents/templates/—— spec/plan/pitfall/knowledge/runbook 模板.agents/README.md、.agents/inbox/README.md
3. 陪同用户完成三件事（不要跳过）
- 审 L1 安全底线：打开新生成的
CLAUDE.md，把「安全底线」一节逐条读给用户，按项目实际补充专有红线（例如：专用设备、禁止触碰的分支、数据不可编造的具体口径）。 - 审门禁清单：展示
.agents/gate.conf默认保护项，问用户要不要增删。 - 建议首个 git 提交：骨架应入库，建议
git add CLAUDE.md .agents并提交（提交信息由用户确认）。
4. 说明日常循环（一段话讲完即可）
- 干活：读 L2 索引按指针走；过程状态写
.agents/current/notes.md。 - 踩坑：修完用
.agents/templates/pitfall-template.md记录，提议加入 L2 索引（需审批，改受保护文件要门禁令牌）。 - 提炼：定期跑
event-review技能（/l123-harness:event-review）做周审。
纪律
- 绝不覆盖已有文件；冲突一律报告给用户裁决。
- 不在骨架里预填任何项目知识——空的表头就是对的。
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.
- 9d ago First seen · 45 lines · 95 tokens per session scan A e56d87221ccb
init-harness is a skill published in the GitHub repository reatcat/l123-harness (4 stars, last pushed 18d ago), licensed MIT. It adds 95 tokens to every session and 697 once invoked, about $0.0005 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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