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 skills add 2428424081cn/Skill-mcp --skill first-principlesgit clone --depth 1 https://github.com/2428424081cn/Skill-mcpWrote 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/2428424081cn/skill-mcp/first-principles)<a href="https://agentmods.dev/skills/2428424081cn/skill-mcp/first-principles"><img src="https://agentmods.dev/badge/skills/2428424081cn/skill-mcp/first-principles/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/2428424081cn/skill-mcp/first-principles"><img src="https://agentmods.dev/badge/skills/2428424081cn/skill-mcp/first-principles.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 | $0.00041 | $0.00309 |
| Opus 5 | $0.00020 | $0.00154 |
| Sonnet 5 | $0.00008 | $0.00062 |
| Haiku 4.5 | $0.00004 | $0.00031 |
Grade A, and why
first-principles 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 8d 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
第一性原理思考指南 (First Principles Reasoning)
第一性原理是亚里士多德与马斯克推崇的究极思考范式：把事物拆解到最基础的事实公理，然后从底层往上推导。
三步推导法
第一步：识别并质疑所有“理所当然”的假设
列出所有传统做法中的习惯性假设：
- “行业里大家都用 Redis 做这事” ➔ 为什么？是必须用，还是只是图省事？
- “这个查询必须在 1 秒内完成” ➔ 真实物理限制是网络延迟还是序列化？
第二步：提取不可动摇的基础事实（Ground Truths / Axioms）
- 计算机科学硬约束：时间复杂度、内存容量、光速网络 RTT、磁盘顺序读写与随机读写吞吐差异。
第三步：从底层事实自底向上重新构建解决方案
不参照任何现有框架，仅用基础积木搭建最简、最快、最本质的解法。
What ships with it
2 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.
- 8d ago First seen · 22 lines · 41 tokens per session scan A bfec95d07f3c
first-principles is a skill published in the GitHub repository 2428424081cn/Skill-mcp (1 stars, last pushed 15d ago), licensed MIT. It adds 41 tokens to every session and 309 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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