Jev glossary
Evaluation & TrainingText generation
Generation limitation
Jev is not trained to generate text; forcing it by chaining choices is slow and unreliable, so extraction becomes a Choice instead.
- Category
- Evaluation & Training
- Also known as
- Text generation
- Reading time
- 1 min
- Related terms
- 4
- Directory entries
- 2
- Docs
- docs.typesafe.ai
- Added
- 2026-09-24
Definition
The jaggedness page lists generation as a failure mode with a blunt remedy: when the answer space is bounded, turn extraction into a Choice over options rather than asking for the value itself, and if you really need text generation, there are other models for that.
The pre-parsed extraction cookbook is the constructive version: regex or a generative model proposes candidates, and Jev picks the correct span so the returned value is copied verbatim.
Tagslimitationsextraction
Related terms
Definitions that connect to this one.
JaggednessThe documented set of jev-1.13 failure modes (literal reading, counting, dates, indirection, context rot), each with a guardrail.Evaluation & TrainingPre-parsed value extractionRegex finds candidate spans, then Jev picks the requested one so code copies a verbatim value that cannot be invented.PatternsChoicePick one option from a set you define; returns the selected option, a probability for every option, and confidence.PrimitivesText-only inputJev evaluates strings, JSON objects, and arrays of text; images, audio, and video are not supported and must be pre-processed.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
Regex finds candidate emails, phone numbers, and amounts; Jev picks the requested span so code copies a verbatim value that cannot be invented, with no free-text extraction required.
Jev CookbooksDocs#official#cookbook#extraction
Official
From the Jev AI model community
Posts from builders shipping with Jev right now.