Community-curated · Updated Sep 19, 2026

Find the best of the Jev ecosystem.

Jev is TypeSafe's flagship System One model: send state and typed questions, get structured answers your code can use directly. This is a directory of the repos, practices, and sites worth your time around the official docs.

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Resources: 44
Categories: 5
Official: 19
Community: 25

Featured

Hand-picked starting points for building with Jev.

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TypeSafe Documentation

The canonical introduction: Jev is TypeSafe's flagship model and the first System One model. Send state and typed questions, get structured answers your code can use directly.

Sites & Guides#docs#official#primitives

Official

Primitives: Choice, Score & Noul

The three TypeSafe question types, the typed answers they return, how to choose between them, and how to ask several in a single call.

Practices & Patterns#official#primitives#choice

Official

Patterns

Architectural patterns for System One systems: speculative fan-out, confidence-gated routing, composite scoring, and intent routing.

Practices & Patterns#official#patterns#architecture

Official

Cookbook: Re-ranking

One question per query-candidate pair raises top-1 accuracy from 5% to 18% and top-10 accuracy from 38% to 62% on 40 CLERC legal queries.

Cookbooks & Demos#official#cookbook#reranking

Official

TypeSafe JavaScript / TypeScript SDK

168

Official TypeScript/JavaScript client with inferred answer types, retries, and a question DSL. `npm install @typesafe-ai/sdk`.

Repos & SDKs#official#sdk#typescript

Officialtypesafe-sdk-js

Launch: Introducing System One Models & Jev

The launch story: why TypeSafe built decision models, the side-by-side demo, the Doom and Wikiracing bots, and the published workflow evals.

Sites & Guides#official#announcement#benchmarks

Official

Awesome Jev

A tracked index of the whole ecosystem: hundreds of GitHub repos, live sites, and articles, with stars refreshed daily from GitHub.

Sites & Guides#community#awesome-list#directory

Community

Classify, Route, and Score with Jev and AI SDK

End-to-end guide to a ticket-routing workflow with confidence thresholds, zero-data-retention options, and mock-based tests that need no network call.

Sites & Guides#community#vercel#tutorial

Community

jev-experiments

312

A monorepo of roughly 20 latency-focused demos: moderation firehoses, rerankers, inbox triage, macOS launchers, and closed-loop control simulators, each with p50/p95 telemetry.

Repos & SDKs#community#demos#typescript

Communityjev-experiments

Pydantic AI: TypeSafe (Jev) Model

Run a Pydantic AI agent on Jev: each field of the output type becomes one question, the prompt is the state, and confidence comes back per field.

Tools & Integrations#community#pydantic#python

Community

A Deep Dive into Jev

A practical tour with JavaScript examples: typed choices, scores, probabilities, real latencies and costs, the jagged edges, and how to split jobs correctly.

Sites & Guides#community#tutorial#javascript

Community

Browse by category

Five ways into the ecosystem, from official SDKs to community tools.

01Repos & SDKs11Client libraries, adapters, and source code you can build on.02Practices & Patterns5How to design states, questions, and confidence gates the right way.03Sites & Guides9Documentation, write-ups, and community hubs for learning Jev.04Cookbooks & Demos6Runnable recipes and end-to-end examples from the TypeSafe team.05Tools & Integrations13CLIs, MCP servers, playgrounds, and platform integrations.