TypeSafe publishes 9 known failure modes of jev-1.13 and how to work around them
hackgoofer · x · 2026-09-19
TypeSafe published a "jaggedness" doc for jev-1.13, admitting the model is still too slow, too expensive, and too dumb, and inviting the community to report issues in the model-jaggedness Discord channel.
Nine known failure modes with workarounds:
- Literal reading: state exact conditions and boundary cases explicitly
- Math/numbers: keep arithmetic in code
- Date/time comparison: extract components, compare in code
- Indirection: reduce hops, point to relevant state
- Large noisy state: filter first
- Adversarial content: precise prompts, test edge cases
- Contradictory instructions: align criteria first
- Common-sense structural invariants: ask each decision one way, enforce identities in code
- Generation: use a generative model
Jev excels at System One tasks but struggles with indirection and numeric precision.
Related event: TypeSafe Documents Nine Known Weaknesses of Jev 1.13(2 posts)→
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