The full directory

All Jev AI model resources

Entries for TypeSafe AI's flagship System One model — official docs and SDKs alongside community clients, tools, and write-ups.

Entries: 3,919
Categories: 11
Official: 102
Community: 3,817
Source sites: 293
Deep dives: 3,919

By format

3919

Docs169
Repos & sites3102
Videos74
Posts104
Articles392
Playgrounds78

Updated Nov 6, 2026

Browse the Jev AI model by category

11 ways into the ecosystem. Each category page leads with its own shortlist of starting points.

Browse the Jev AI model by use case or industry

The same directory, sliced by what you are building and who you are building it for.

Jev use cases13 ways to put Jev to work, from classification and routing to decision gating and evaluation.

Jev industries14 sectors building with Jev, from software and security to healthcare and robotics.

All 3919 Jev AI model resources

Search the full directory, or filter by category and tag.

Showing 2113–2160 of 3919 resources

jevsome-projects

Curated index of open-source projects that provably call Jev, where every entry links to the exact source line proving the call, generated from data/index.json with rejects kept in not-listed.json.

Jev Guides & Articles#community#github

Community

ozers/jevsome-projectsJavaScript

systemone

Compatibility server exposing the /v1/systemone typed-decision API on top of vLLM, SGLang, or OpenRouter models, with vision models enabling image inputs that Jev and Laya lack.

Jev Integrations & Adapters#community#github

Community

infinitylogesh/systemonePython

jevlin

Experimental typed Zig SDK for Jev targeting Zig 0.16.0, asking yes/no, classification, and scoring questions in one request and returning probabilities with Zig enums.

Jev Repos & SDKs#community#github

Community

copyleftdev/jevlinZig

jev-sim

Wire-compatible Jev re-implementation reading typed decisions from an LLM's next-token logits, plus a reproducible JevBench-based comparison of that approach against Jev on identical items.

Jev Benchmarks & Evaluations#community#github

Community

dashbi1/jev-simPython

jev-dotnet

Dependency-free .NET client for Jev targeting net8.0, sending state plus Choice, Score, and Noul questions and returning typed answers with confidence for threshold gating.

Jev Repos & SDKs#community#github

Community

CMaintz/jev-dotnetC#

decision-model-sdk-rust

Async Rust client for System One decision-model endpoints with a Questions builder or compile-time QuestionSet derive, sharing one multiplexed HTTP/2 connection with no vendor default.

Jev Repos & SDKs#community#github

Community

zchee/decision-model-sdk-rustRust

brasileirao-jev

Claude Cowork plugin running reproducible Brasileirao Serie A probability experiments through Jev over Vercel AI Gateway, with Claude only fetching the table and presenting raw numbers.

Jev Integrations & Adapters#community#github

Community

andretestanalyst/brasileirao-jevJavaScript

sys1rust

Rust server running Laya decision models locally on Apple silicon GPUs over MLX with no Python at runtime, speaking the same /v1/systemone API as laya serve.

Jev Models & Reimplementations#community#github

Community

krishhgg/sys1rustRust

can-jev-bayes

Bayesian decision study probing Jev on stationary Bernoulli multi-armed bandits, testing whether posterior statistics, exploration instructions, and supplied action values improve cumulative reward.

Jev Tools & CLIs#community#github

Community

TomRichner/can-jev-bayesPython

jev-triage

GitHub Action that labels newly opened issues with Jev, returning a label plus confidence and flagging low-confidence cases for a human or an LLM instead of guessing.

Jev Tools & CLIs#community#github

Community

CMaintz/jev-triage

jev-symfony-bundle

Unofficial Symfony bundle exposing Jev noul, choice, and score questions through a typed client, validator constraints, Messenger background evaluation, Workflow guards, and a profiler panel.

Jev Tools & CLIs#community#github

Community

vbcherepanov/jev-symfony-bundlePHP

ci-gatekeeper-bot-jev

GitHub Action that triages pull requests with four Jev typed questions and routes each PR to auto-approve, human-review, or block with a commit status and explanatory comment.

Jev Integrations & Adapters#community#github

Community

NemanjaManic/ci-gatekeeper-bot-jevShell

grok-jev-router

Dependency-free Python toolkit that puts Jev in front of Grok Bot, turning calibrated answers into proceed, dry_run, ask_human, or skip with hard-coded safety overrides.

Jev Integrations & Adapters#community#github

Community

colinmcdermott/grok-jev-routerPython

jev-agent-guardrail

Python guardrail that intercepts agent tool calls, sends agent state plus tool details to Jev, and allows, blocks, or reroutes execution based on Choice, Score, and Noul answers.

Jev Agents & MCP#community#github

Community

bhanuprakashk90-tech/jev-agent-guardrailPython

jevless

Independent toolkit that reproduces Jev-style Choice, Noul, and Score decisions on any model exposing log-probabilities, plus a local server speaking the same systemone request shape.

Jev Agents & MCP#community#github

Community

jbpayton/jevlessPython

jast

Experimental desktop SAST app that asks Jev reviewable questions about bounded source regions, with Rust handling inventory, bounds, hashing, consent, and persistence.

Jev Tools & CLIs#community#github

Community

turenlabs/jastRust

magi-system-on-jev

Evangelion-inspired MAGI demo that runs a question past three independent Jev sages and decides by majority vote over calibrated probabilities, with a live site and bilingual guides.

Jev Tools & CLIs#community#github

Community

hide-G/magi-system-on-jevJavaScript

tictacjev

Tic-tac-toe demo where Jev plays one side through a Choice question over open cells, returning a chosen cell, confidence, and per-cell probabilities shown in an expandable move log.

Jev Tools & CLIs#community#github

Community

darthblanc/tictacjevTypeScript

scheda.js

ES6 rewrite of scheda.js for SystemOne-inspired timetable grids, drawing courses on canvas with configurable ids, colors, themes, and PNG export.

Jev Models & Reimplementations#community#github

Community

rrsilaya/scheda.jsJavaScript

jev-decision

Portable Python client bringing typed Jev judgments (noul, choice, score) to coding-agent harnesses over MCP or shell, with a shared budget ledger plus harness and memory-system recipes.

Jev Agents & MCP#community#github

Community

Coding-Dev-Tools/jev-decisionPython

openthai-systemone-doom

Tiny open 0.8B decision model with no text generation or vision that plays Doom in real time from symbolic game state, answering movement and crosshair questions in one forward pass.

Jev Models & Reimplementations#community#github

Community

iapp-technology/openthai-systemone-doomPython

jev-graphrag

Self-contained Neo4j demos showing where Jev helps GraphRAG pipelines: calibrated Choice, Score, and yes-no judgments on the decision steps, with open-ended generation left to a full LLM.

Jev Tools & CLIs#community#github

Community

neo4j-field/jev-graphragPython

jevmap

Codebase mapper that indexes a repo into small units without AI, then asks Jev which units matter for a plain-language task and returns ranked files with line numbers and probabilities.

Jev Agents & MCP#community#github

Community

aegsrl7/jevmapJavaScript

jev-flight-agent

Browser-use agent that completes flight searches in real Chrome: Jev picks each next action from an indexed DOM table while a small model handles only text entry.

Jev Agents & MCP#community#github

Community

kallurayaankit/jev-flight-agentPython

systemone-nodes

ComfyUI custom nodes that send text plus typed SystemOne questions in one request and branch the image workflow on the answers, such as picking a LoRA from the prompt.

Jev Tools & CLIs#community#github

Community

rockerBOO/systemone-nodesPython

demo-tetris-jev

Arcade Tetris demo where Jev picks each piece's rotation and position: the engine enumerates reachable placements and a local Node server asks one choice question per move.

Jev Demos & Experiments#community#github

Community

marcelomar21/demo-tetris-jevJavaScript

jev-guard

PI agent extension pairing in-flight terminal-output pruning with a surgical diff and secret guard, both driven by typed Jev questions plus a deterministic secret-literal layer.

Jev Tools & CLIs#community#github

Community

yelkhanyergali-sys/jev-guardJavaScript

dsh-jev

DeepSeek Harness community plugin that classifies each turn's newest user message through the systemone endpoint and injects the verdict as tagged runtime context for tone and priority.

Jev Integrations & Adapters#community#github

Community

Excalibur9527/dsh-jevJavaScript

minicpm5-2b-jev

Open-weight 2B single-pass System One decision model on MiniCPM5-2B that answers a shared-state dictionary of choice, noul, and score questions in one forward pass without generating text.

Jev Models & Reimplementations#community#github

Community

yuting-ai/minicpm5-2b-jevPython

Jev.Sdk

Independent .NET client for the System One API with typed noul, choice, and score questions, DependencyInjection integration, cached model discovery, local validation, and typed errors.

Jev Repos & SDKs#community#github

Community

nothingmn/Jev.SdkC#

pi-jev-gate

Pi extension that checks file-mutating tool calls against written rules in constraints.md, asking Jev which rule a change violates and offering rework with the rule text.

Jev Agents & MCP#community#github

Community

hcl-z/pi-jev-gateTypeScript

jev-bridge

Jev-style /v1/systemone API over any OpenAI-compatible backend, reading single-token label logprobs with a restricted softmax instead of generating JSON.

Jev Tools & CLIs#community#github

Community

TOSUKUi/jev-bridgePython

Jev-is-odd

Deliberately overengineered TypeScript package that asks Jev whether an integer is odd, with ESM and CommonJS builds, typed answers, and token and timing receipts.

Jev Benchmarks & Evaluations#community#github

Community

robipop22/Jev-is-oddJavaScript

jevcast

Native macOS launcher and window manager on Option-Space for apps, files, calculations, window layouts, and clipboard reuse, with optional Jev matching for loose phrasing.

Jev Tools & CLIs#community#github

Community

RyanErkal/jevcastSwift

backoffice-agents

Backoffice email pilot where the LLM generates and uses CRM and ERP tools while Jev triages, gates tool calls, and verifies drafts before sending, with Telegram human approval.

Jev Agents & MCP#community#github

Community

lucianoon/backoffice-agentsPython

jev-one

JavaScript library for stateful Jev applications where choices name words, places, tools, or vocabularies, and code validates effects while the runtime carries observations forward.

Jev Tools & CLIs#community#github

Community

thezem/jev-oneTypeScript

typesafe-ai-implementation-skill

Engineering playbook and skill for placing Jev typed judgments at bounded seams while keeping validation, permissions, persistence, and policy in deterministic code.

Jev Agents & MCP#community#github

Community

ngallodev-software/typesafe-ai-implementation-skillPython

lean-codex-stack

Reusable Codex setup separating stable AGENTS.md rules, the TypeSafe skill, Caveman conciseness modes, and the task prompt, with a Markdown guide and printable PDF.

Jev Agents & MCP#community#github

Community

KelvinxG/lean-codex-stack

typesafe-go

Go client for the TypeSafe API with typed noul, choice, and score builders, standard-library-only dependency, environment or struct configuration, and per-call overrides.

Jev Repos & SDKs#community#github

Community

lib-x/typesafe-goGo

readwise-jev-classifier

Readwise inbox proof of concept asking Jev one question set per article: a 23-tag scoring page plus a single-verdict triage page, with results kept in PocketBase.

Jev Tools & CLIs#community#github

Community

osrim/readwise-jev-classifierTypeScript

omp-plugin-jev-router

Oh My Pi extension that asks Jev whether each interactive prompt is simple or advanced, then switches the OMP model role and thinking level without rewriting the prompt.

Jev Integrations & Adapters#community#github

Community

atulify/omp-plugin-jev-routerTypeScript

ifReflex.cpp

Native C++ server on llama.cpp that answers System One choice, score, and noul questions locally in one prefill pass with zero generated tokens.

Jev Models & Reimplementations#community#github

Community

DreamBlooms/ifReflex.cppC++

instagram-safe-feed

Chrome proof of concept that sends Instagram post text to Jev and sampled images to Gemini, then overlays a colored border with expandable harm and promotion signals.

Jev Tools & CLIs#community#github

Community

Aagamsheth0601/instagram-safe-feedJavaScript

jev-ncr-demo

Rust Leptos and Axum demo that sends an NCR description to Jev as state with one yes-or-no question per defect code, then sorts suggestions by confidence.

Jev Tools & CLIs#community#github

Community

Alexandre-Borghi/jev-ncr-demoRust

agent-workflow-typesafe-ai

Standalone Agent-Workflow adapter that projects bounded redacted evidence into typed Jev choice, noul, and score questions and returns secret-free advisory receipts.

Jev Agents & MCP#community#github

Community

ngallodev-software/agent-workflow-typesafe-aiPython

resume-jev-match

FastAPI service that scores one resume against one job description in a single Jev fan-out call, returning fit, skills, seniority, and a human-review flag.

Jev Integrations & Adapters#community#github

Community

vishalyadav28/resume-jev-matchPython

jev-triage

Probot GitHub app that triages issues and pull requests with two Jev fan-outs for category, impact, completeness, spam, and duplicates, then labels and comments once.

Jev Tools & CLIs#community#github

Community

ashafizullah/jev-triageTypeScript

systemone

Rust CLI and resident HTTP service that exposes local and hosted decision models behind one Jev-compatible typed-JSON API with no generated prose to parse.

Jev Models & Reimplementations#community#github

Community

codesoda/systemoneHTML

Start here with the Jev AI model

Hand-picked entries the maintainers recommend first, from official primitives to community tools.

Jev: For the Builders AND Dreamers (Jev 1.14)

The Jev Day release post: Jev 1.14.0 under jev-preview plus three danger-zone features — composable images on both models, the box question type on 1.14 only, and opt-in 262k context.

Jev Guides & ArticlesArticle#official#release#vision

Official

Box Questions (Dreamer-Ready)

The box question type: one bounding box per question, returned as four edges that are fractions of the image, plus confidence, with no criteria field and no not-found value.

Jev Practices & PatternsDocs#official#docs#vision

Official

Jev 1.14 Day 0 Support in LiteLLM

LiteLLM's Day 0 post for TypeSafe Jev 1.14: the proxy adds box questions, image input and long-context mode on both POST /v1/systemone and POST /v1/decisions, forwarding TypeSafe-Danger-Zone headers only to TypeSafe deployments.

Jev Integrations & AdaptersArticle#community#litellm#gateway

Community

Newest Jev AI model resources

The latest additions to the directory, newest first.

From the Jev community

Watch walkthroughs, read the threads, and see what builders are posting.

Watch6Discussions6Posts9

YouTube: KodeKloud's three-minute primer: what a System One model decides, and why it answers in milliseconds.

YouTube: Caleb Writes Code explains what Jev is and how to call it, in seven minutes.

YouTube: Greg Isenberg and Ryan Vogel on the businesses Jev unlocks, and a path in through the Vercel AI Gateway.

YouTube: CJ from Syntax demos browser use, classification, code review, a model router, and a chat bot with no LLM.

YouTube: Ryan Vogel runs Jev on 100 and then 1,000 emails: category, priority, spam, and reply predictions.

YouTube: AICodeKing tests support routing, refund detection, prompt-injection resistance, and browser automation.

Hacker News: Show HN: Ad Spend Guard gates budget before the auction, not the creative after.

Show HN: Gating ad budget with a decision modelRead the thread on Hacker News

Reddit: Reranking rebooking options with a decision model, ranked with reasons.

Hacker News: Pick Verify: a single decision at the warehouse pick station catches confusable picks.

Show HN: Verifying robot picks with a decision modelRead the thread on Hacker News

Hacker News: Decision Index 0.2.1 scores open reproductions of Jev on a frozen suite.

jackbravo4 pointsDecision Index 0.2.1 – 70 open reproductions of TypeSafe Jev's Decision ModelRead the thread on Hacker News

Hacker News: Software Bombe and live Enigma demo where Jev ranks cribs and judges plaintext.

ag_212 pointsShow HN: Jev as the Bletchley Park Analyst: A Software Bombe on EnigmaRead the thread on Hacker News

Hacker News: Show HN for the decide CLI: brew install, file context, and multi-question shell scripts.

vsekhar2 pointsShow HN: Decide – Jev decisions in the shell, scripts, and agent skillsRead the thread on Hacker News

Follow @typesafeai

How entries are chosen

Every entry is reviewed against the same bar, whether it comes from TypeSafe or the community.

Public and working — no paywalls, sign-up walls, or dead links.
Concrete — it has to be about Jev and the System One API, not generic LLM content.
Useful today — something a developer can learn from or use right now.
Distinct — if a similar entry exists, the description has to say what makes this one different: a different runtime, a cheaper path, a measured result, or a narrower focus.
Documented — repos state their license, and docs are in English or carry an English summary.

Spam, affiliate links, and thin AI-generated content are rejected. New entries are expected to ship with a deep dive: two to five highlights, caveats, a quickstart snippet where one helps, and a verification date. Star counts are refreshed when an entry is touched.

Common questions

Short answers about Jev and how this directory works.

What is the Jev AI model?

Jev is TypeSafe AI's first System One model — an AI model that takes a state plus typed questions and returns one structured answer per question: a choice, an ordered score, or the probability of yes, with calibrated confidence on Choice and Score answers. Code can branch on the result without parsing generated text.

What is the difference between Choice, Score, and Noul?

They are the three question primitives. Choice picks one of up to 255 options, Score rates on 2 to 10 ordered levels, and Noul answers yes or no. Choice and Score answers carry a confidence between 0 and 1; a Noul answer is the probability of yes.

Which Jev SDKs and client libraries are available?

TypeSafe maintains official JavaScript/TypeScript and Python SDKs plus a Python adapter. The community has built clients for Go, .NET, PHP, Laravel, Rust, Elixir, Ruby, and Scala, along with framework integrations such as DSPy, LlamaIndex, and Home Assistant. All of them are listed in the Repos & SDKs category.

Is the directory free, and is it affiliated with TypeSafe AI?

The directory is free to browse: every entry is reviewed, and spam, affiliate links, and sign-up walls are rejected. JevDirectory.org is community-run and not affiliated with TypeSafe AI — Jev and System One are TypeSafe AI trademarks.

How often is the directory updated?

Entries are added as new resources appear and re-checked when they are touched. The directory currently holds 3919 entries from 293 source sites, last updated Nov 6, 2026.

What is a verified deep dive?

Most entries include a deep dive: two to five highlight bullets someone would only know from using the resource, a caveats note about limits and requirements, an optional quickstart snippet, and the date the link was last checked. 3919 of the 3919 entries carry one today.

For the canonical details, read the official TypeSafe docs and the API reference.