Design that prevents the LLM from doing calculations

Read a Zenn article on using Jev, a decision-specialized model, to control Mario without letting an LLM do arithmetic.

The original post, translated

Design that prevents the LLM from doing calculations — reading the implementation where the judgment-specialized model Jev operates Mario https:// zenn.dev/ruri/articles/ typesafe-mario-facts-in-code …

Show the original post in its source language ▾

LLM に計算をさせない設計 — 判断特化モデル Jev がマリオを操作する実装を読む https:// zenn.dev/ruri/articles/ typesafe-mario-facts-in-code …

The post above is a machine translation from ja; the untranslated text is in the fold-out.

Engagement when collected

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Numbers are a snapshot taken from X when the case was added to the library (schema v1, collected 2026-09-19); they will not match today.

Where this case fits

Filed under coding & developer tools. In the pattern Jev is built for, the model answers a bounded question per step — and ordinary code acts on the answer, because the answer is already a value rather than a paragraph. Other posts in the same family are on the coding & developer tools page.

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Last updated: 2026-09-22 · sources & corrections · every card links to its author's original post