Jev glossary
Core ConceptsStructured output
Typed decision
A model output that conforms to a software type your code expects, rather than free-form text that has to be parsed.
- Category
- Core Concepts
- Also known as
- Structured output
- Reading time
- 1 min
- Related terms
- 4
- Directory entries
- 2
- Docs
- docs.typesafe.ai
- Added
- 2026-09-24
Definition
System One is type-safe by construction: decisions and probabilities conform to the structured types and JSON schema your code expects. The model returns a distribution over the options you supplied, never a value outside the schema.
Typed decisions are what make Jev composable. They can be compared, thresholded, sorted, stored, and fed into further logic (or into a classical ML model) without the parsing layer that text generation requires.
Tagscorearchitecture
Related terms
Definitions that connect to this one.
System OneThe class of AI models built to make fast, structured decisions software can use directly, named after Kahneman's fast-thinking System 1.Core ConceptsAnswerThe structured result returned under a question's ID: a choice, a score, or a probability of yes, plus distributions and confidence.Core ConceptsAI-powered softwareThe architecture TypeSafe recommends: code owns the workflow and the model appears only where programmable common sense is needed.Core ConceptsComposable AITypeSafe's manifesto position: intelligence as a dependable primitive that software branches on, rather than an assistant that keeps humans in the loop.Core Concepts
From the Jev directory
Directory entries that go deeper on this term.
The idea behind Jev: models that return typed decisions and probabilities instead of generated text, named after Kahneman's fast-thinking System 1, with confidence to route around uncertainty.
Jev Guides & ArticlesDocs#official#docs#architecture
Official
Design AI-powered software by keeping code in control and giving System One narrow, structured decisions to make.
Jev Practices & PatternsDocs#official#patterns#architecture
Official
From the Jev AI model community
Posts from builders shipping with Jev right now.