Jev glossary
Evaluation & TrainingModel jaggedness
Jaggedness
The documented set of jev-1.13 failure modes (literal reading, counting, dates, indirection, context rot), each with a guardrail.
- Category
- Evaluation & Training
- Also known as
- Model jaggedness
- Reading time
- 1 min
- Related terms
- 6
- Directory entries
- 1
- Docs
- docs.typesafe.ai
- Added
- 2026-09-24
Definition
TypeSafe maintains a jaggedness page for the current model: nine failure modes with a do-this-instead for each. The page frames them as design constraints rather than bugs, reviewed periodically rather than continuously.
The list is unusually honest for a vendor doc, and it doubles as a checklist for new integrations: state the exact condition, keep arithmetic in code, extract dates as components, reduce indirection, filter state, and test adversarial input.
Tagslimitationsevaluation
Related terms
Definitions that connect to this one.
Literal readingJev answers the question you wrote, not the one you meant; scoping words, negations, and implied conditions are read at face value.Evaluation & TrainingUnreliable countingJev does not count reliably (characters, occurrences, or list items), and error grows with the size of the thing counted.Evaluation & TrainingDates as textJev reads dates as strings, not ordered quantities; extract components with Choice and do the ordering and math in code.Evaluation & TrainingIndirectionQuestions about a property of a property, or with double negatives, cost accuracy; write instructions as directly as possible.Evaluation & TrainingStructural invariantsArithmetic identities you might assume (complementary probabilities summing to 1, agreement across question types) are not guaranteed.Evaluation & TrainingContext rotThe accuracy loss that comes from padding state with detail unrelated to the question; filter state before sending it.Core Concepts
From the Jev directory
Directory entries that go deeper on this term.
A maintained list of jev-1.13's known failure modes, literal reading, unreliable counting, dates as text, indirection, context rot, and contradictory criteria, each with a guardrail.
Jev Practices & PatternsDocs#official#docs#evaluation
Official
From the Jev AI model community
Posts from builders shipping with Jev right now.