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JevMade field notes / Model limitations guide

Known limits of Jev 1.13

TypeSafe describes where Jev 1.13 can go wrong, including arithmetic, misleading text, unclear instructions, and questions that depend on several reasoning steps.

Original by TypeSafe AIGuardrails

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Our summary

TypeSafe's limitations page warns that Jev can follow the literal wording of a question rather than its intended meaning. Extra unrelated information can distract it. Text written to trick the model can also influence the answer, so supplied material is not automatically safe to trust.

Leave counting, sums, date comparisons, and permission checks to ordinary software. Give Jev the parts that require understanding meaning. Clear questions should point directly to the relevant information, avoid conflicting instructions, and separate several judgments that would otherwise be hidden inside one question.

Two ways of asking what seems like the same question may produce different numbers. Asking a question and its opposite does not guarantee answers that add up neatly. Jev also does not write text. Test real cases and deliberate tricks before allowing important actions.

Key takeaways

  1. Write the exact condition you want checked and leave out unrelated material.
  2. Keep exact calculations and permissions in ordinary software.
  3. Test misleading inputs and different question forms rather than assuming they behave alike.

These limitations apply to Jev 1.13 and were last reviewed by TypeSafe on 17 September 2026. Later versions may behave differently.

Official TypeSafe documentation · Source reviewed

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