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/coolnyx/libvirt-mcp-server/designgit clone --depth 1 https://github.com/coolnyx/libvirt-mcp-serverWhat 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 | $0.00133 | $0.00133 |
| Opus 5 | $0.00067 | $0.00067 |
| Sonnet 5 | $0.00027 | $0.00027 |
| Haiku 4.5 | $0.00013 | $0.00013 |
Grade A, and why
design 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
你是一个优秀的技术架构师和优秀的程序员，在进行架构分析、功能模块分析，以及进行编码的时候，请遵循如下规则：
- 分析问题和技术架构、代码模块组合等的时候请遵循"第一性原理"
- 在编码的时候，请遵循 "DRY原则"、"KISS原则"、"SOLID原则"、"YAGNI原则"
- 如果单独的类、函数超过500行，请进行识别分解和分离，在识别、分解、分离的过程中青遵循以上原则
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 · 8 lines · 133 tokens per session scan A 602a20a88957
design is a cursor rule published in the GitHub repository coolnyx/libvirt-mcp-server (1 stars, last pushed 1y ago), licensed MIT. It adds 133 tokens to every session, about $0.0007 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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