Start building with Jev

TypeSafe JavaScript SDK

TypeSafe AIOfficial

The official JavaScript and TypeScript client, with answer types inferred from your questions.

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TypeSafe Python SDK

TypeSafe AIOfficial

Official synchronous and asynchronous Python clients for Choice, Score, and Noul questions.

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TypeSafe Rust SDK

gilljon

A community Rust client with async and blocking APIs, typed answers, and configurable retries.

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typesafe-go

cole-gillespie

An independent Go SDK with question constructors, typed answer accessors, and context support.

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System One Adapter

TypeSafe AIOfficial

Run System One-shaped evaluations through other model APIs to build comparisons with Jev.

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Zod Jev

jomatsu

Combine Zod shape validation with Jev semantic checks.

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TypeSafeAI for .NET

Hawxy

Typed System One clients and Microsoft.Extensions.AI adapters for .NET.

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TypeSafe Swift SDK

InsaneArts

Call TypeSafe with inferred answer types from Swift applications.

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ZIO TypeSafe AI

jamesward

Use named tuples for typed Jev questions and answers in Scala.

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TypeSafe for Elixir

mattneel

Ask batched Choice, Noul, and Score questions from Elixir.

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TypeSafe PHP SDK

valksor

A strictly typed PHP client with configurable transport and retries.

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TypeSafe Zig

mattneel

Infer Jev answer types from the questions defined in Zig.

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TypeSafe Ruby SDK

joshmn

A Ruby client for direct access to the System One API.

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Jevgo

fgn

A Go System One client with optional Langfuse instrumentation.

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Decido

yairshy

Build typed decision workflows with Jev or a custom provider.

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Jod

mateonunez

Bind a validated state schema and Jev questions into one typed artifact.

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TypeSafe Quick Start

TypeSafe AIOfficial

Start with the playground, make an HTTP request, and translate a first evaluation into Python.

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Choice, Score & Noul

TypeSafe AIOfficial

Understand the three question types, the answers they return, and when to use each.

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System One Workflow Patterns

TypeSafe AIOfficial

Explore fan-out, confidence-based routing, composite scoring, and intent routing.

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System One HTTP API

TypeSafe AIOfficial

The request and response contract for calling Jev directly over HTTP.

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Jev 1.13: Known Limitations

TypeSafe AIOfficial

TypeSafe's model-specific notes on failure modes and how to structure questions around them.

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TypeSafe Workflow Evals

TypeSafe AIOfficial

TypeSafe's published comparison of structured workflows and single-prompt approaches.

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