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Bazi-Ziwei: a Chinese-astrology skill that does the math itself
An AI agent skill for classic Chinese fortune-telling — Four Pillars and Purple Star charts — where the actual chart is built by exact algorithms, not guessed by the model. The AI is left to interpret, and it can print the result as an ink-wash poster.
This is an agent skill for two traditional Chinese divination systems — Ba Zi (Four Pillars of Destiny) and Zi Wei Dou Shu (Purple Star astrology). Its core move is to separate the math from the meaning: deterministic algorithms compute the chart from a birth date, while the language model is reserved for interpretation. It offers three modes — each system on its own or a combined cross-check — and can output either a detailed markdown write-up or an ink-wash-style HTML poster. It's written mostly in TypeScript and follows the SKILL.md standard, so it plugs into Claude, Codex, Cursor and similar agents.
Why a vibe-coder should care
It's a neat demonstration of a wider idea: let code do what code does best and let the AI do the talking. Even if you never touch Chinese astrology, the pattern — exact calculation first, model interpretation second — is the reason it earns trust where a chatbot guessing numbers would not. And because it all runs locally, nothing about your birth date leaves your machine.
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