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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
3,904
Categories
11
Official
102
Community
3,802
Source sites
293
Deep dives
3,904

By format

3904
  • Docs169
  • Repos & sites3095
  • Videos74
  • Posts104
  • Articles384
  • Playgrounds78

Updated

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 3904 Jev AI model resources

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

Showing 2353–2400 of 3904 resources

azdaja
14GitHub stars
Recursive language-model layer holding full inputs in a local evaluator and exposing a small working surface, with optional typed semantic judgments alongside generative calls.
Jev Agents & MCP#community#jevbest#catalog-import
Communitykubet/azdajaPython
jevbot
21GitHub stars
Discord bot forcing a textless decision model to speak by repeatedly picking the next word through vocab tournaments, a completeness check, and reuse penalties.
Jev Demos & Experiments#community#jevbest#catalog-import
Communitylyramakesmusic/jevbotPython
go-jev
46GitHub stars
Go SDK plus a pipeline-friendly CLI for typed decisions, covering single questions, batched question maps, retries, and line-oriented filtering over stdin.
Jev Repos & SDKs#community#jevbest#catalog-import
Communitymattn/go-jevGo
system-one-open
40GitHub stars
Open replica of the typed decision API on openly available base models, answering choice, score, and true-probability questions in one forward pass with no decoding.
Jev Practices & Patterns#community#jevbest#catalog-import
Communitymithalouni/system-one-openPython
ad-radar
26GitHub stars
Open-source browser extension filtering feed posts by local keywords and, with your own model key, labeling ads, chosen topics, and likely AI-generated share directly on the page.
Jev Tools & CLIs#community#jevbest#catalog-import
Communitypengchujin/ad-radarJavaScript
pix-golpe
33GitHub stars
Split-screen demo pitting Rust plus Jev against Python plus DeepSeek on the same Portuguese scam messages, with fund tracing over a simulated graph of 10 million transactions.
Jev Demos & Experiments#community#jevbest#catalog-import
Communitysandeco/pix-golpePython
blink
23GitHub stars
Embeddable C99 runtime for one-pass typed decisions that returns one probability per option with no token loop, plus a 66 KB WebAssembly build for browsers and Node.
Jev Demos & Experiments#community#jevbest#catalog-import
Communitysqliteai/blinkC
jevyoumean
16GitHub stars
Shell wrapper that intercepts unknown subcommands, reads the target CLI help output, and asks Jev which documented subcommand matches the intent behind the typo.
Jev Agents & MCP#community#jevbest#catalog-import
Communitysyumai/jevyoumeanGo
JevAny
105GitHub stars
Open training and deployment stack for System 1 decision models: one state-plus-question-plus-options API that returns a choice with probabilities for tickets, tools, or robot actions.
Jev Demos & Experiments#community#jevbest#catalog-import
Communityweitianxin/JevAnyPython
wechat-jev-assistant
20GitHub stars
Windows desktop aid that reads the local WeChat database for the foreground chat, strips identifiers, and asks Jev for stage, intent, tension, suggested moves, and a reply review.
Jev Tools & CLIs#community#jevbest#catalog-import
Communityyushen100/wechat-jev-assistantPython
Jev-Trades
52GitHub stars
Next.js dashboard plus Python feed that streams market data, computes indicators across timeframes, sends enabled states to Jev, and applies the judgments to a SQLite paper portfolio.
Jev Tools & CLIs#community#jevbest#catalog-import
Communityzadescoxp/Jev-TradesPython
llm-typesafe
28GitHub stars
LLM CLI plugin that exposes TypeSafe classification and scoring as a jev model with yes-or-no, category, and rubric-rating calls from shell or Python.
Jev Tools & CLIs#community#awesomejev#catalog-import
Communitysimonw/llm-typesafePython
claude-jev
25GitHub stars
Coding-agent plugin that routes prompt classification, subagent tiering, edit rule checks, and fast Jev-backed compaction through small typed judgments.
Jev Agents & MCP#community#jevbest#catalog-import
Community0x7067/claude-jevTypeScript
jevthoven
15GitHub stars
Prompt-first symbolic music studio where a live Jev model decides plan, instruments, harmony, groove, and each bar, rendering every pick into an editable multitrack piece.
Jev Tools & CLIs#community#jevbest#catalog-import
Communitycocktailpeanut/jevthovenTypeScript
discern
17GitHub stars
Uncertainty-aware semantic control flow and routable procedures for Effect, with type-safe patterns and policies over Effect Decision and DecisionModel where uncertain answers stay explicit branches.
Jev Integrations & Adapters#community#jevbest#catalog-import
Communitydoeixd/discernTypeScript
away-together-starter
14GitHub stars
Free starter that teaches turning one document into one small typed decision, built around a fictional travel agency where recorded observations meet inspectable application rules.
Jev Demos & Experiments#community#jevbest#catalog-import
Communityearlyaidopters/away-together-starterHTML
jev-me
15GitHub stars
Small skill that grills a plan as a design-tree interview, using Jev ad hoc for typed judgments during the session.
Jev Demos & Experiments#community#jevbest#catalog-import
Communityjon-devlapaz/jev-me
JevTown
49GitHub stars
Pixel-art simulation engine where agents pick structured next actions through Jev while a separate language model handles dialogue, memory, and beliefs, all running in one browser tab.
Jev Demos & Experiments#community#jevbest#catalog-import
CommunityNevaMind-AI/JevTownTypeScript
jevcore
109GitHub stars
Decision layer exposing Jev's typed yes-no, choice, and score answers to DeepSeek Harness and MCP hosts, offline by default with every network transmission disclosed per feature.
Jev Agents & MCP#community#jevbest#catalog-import
CommunityPerryLink/jevcoreTypeScript
Nemotron_Jev
15GitHub stars
Self-hosted Decision Lab that asks typed choice, yes-no, and score questions through a browser explorer and a TypeSafe-shaped local API backed by a diffusion checkpoint.
Jev Demos & Experiments#community#jevbest#catalog-import
Communitypst2154/Nemotron_JevPython
mario-jev
15GitHub stars
Python prototype that plays NES Super Mario Bros. by sending decoded RAM geometry to Jev, which answers movement and jump questions that code composes into controller buttons.
Jev Demos & Experiments#community#jevbest#catalog-import
Communityshantanugoel/mario-jevPython
lintus
12GitHub stars
Single-binary linter whose YAML rules are plain-language questions sent to the Jev model as yes-no judgments with probabilities, fitting CI jobs and pre-commit hooks.
Jev Agents & MCP#community#jevbest#catalog-import
Communityvirolea/lintusRust
TypeAR
960GitHub stars
Type-safe generation layer over existing autoregressive models via JSON Schema on SGLang, returning constrained string, numeric, boolean, and enum answers with optional thinking.
Jev Practices & Patterns#community#jevbest#catalog-import
Communityzmtomorrow/TypeARPython
jev-ultralightspeed
12GitHub stars
Python bulk-classification helper that packs many independent short texts and one judgment question into fewer Jev requests, aimed at queues of tickets, logs, or labels.
Jev Demos & Experiments#community#awesomejev#catalog-import
Communitycollapseindex/jev-ultralightspeedPython
cmd-mod-jev-nudge
20GitHub stars
Command Code mod that asks Jev at every agent stop whether a nudge would help, continuing unfinished work while leaving waits for the user alone.
Jev Agents & MCP#community#jevbest#catalog-import
CommunityCommandCodeAI/cmd-mod-jev-nudgeTypeScript
swift-jev
16GitHub stars
Swift library and CLI for asking Jev typed Choice, Noul, and Score questions from Apple platforms, with answers returned alongside calibrated probabilities in one parallel request.
Jev Repos & SDKs#community#jevbest#catalog-import
Communityd-date/swift-jevSwift
Turn
12GitHub stars
Programming language and VM where agents run as isolated actors with managed context, durable effects, and confidence-aware control flow, including a Jev decision effect.
Jev Integrations & Adapters#community#jevbest#catalog-import
Communityekizito96/TurnRust
jev-chat-for-twitch
13GitHub stars
Chrome extension that adds a second Twitch chat column showing only messages Jev rates as matching your chosen intent, with every row linked to its probability distribution.
Jev Demos & Experiments#community#jevbest#catalog-import
Communityethanplusai/jev-chat-for-twitchJavaScript
eutrya
16GitHub stars
Standalone terminal agent that puts Jev inside its planning loop, proposing text-model steps and scoring candidates against independent rubrics before a deterministic policy executes one.
Jev Agents & MCP#community#jevbest#catalog-import
Communityhellozenstrategist-lab/eutryaJavaScript
JevLint
12GitHub stars
Command-line checker that asks Jev whether each selected source file violates a plain-English convention, returning file-level probabilities for an agent or CI step to act on.
Jev Integrations & Adapters#community#jevbest#catalog-import
Communityiamtoomas/JevLintTypeScript
Jev_apps
34GitHub stars
Curated catalog of community Jev applications grouped by use, where each case explains the mechanism and states what the public evidence does and does not prove.
Jev Practices & Patterns#community#jevbest#catalog-import
CommunityJackZeng/Jev_appsPython
byeori
26GitHub stars
Self-hosted scientific wiki that stores paper PDFs in your AWS account, writes one structured evidence note per paper, and answers questions from those notes with citations.
Jev Tools & CLIs#community#jevbest#catalog-import
Communityjoonan-lab/byeoriPython
open-jev
117GitHub stars
Unofficial PyTorch reconstruction of the ideas behind Jev, encoding state once and answering each question through small typed readout heads in a single parallel pass.
Jev Demos & Experiments#community#jevbest#catalog-import
Communitykyegomez/open-jevPython
pi-jev
14GitHub stars
Pi extension that pairs a local coding model with hosted Jev judgments for skill hints, file retrieval, and evidence ranking, with caching and failure bounds on every call.
Jev Agents & MCP#community#jevbest#catalog-import
Communitymadeye/pi-jevTypeScript
snapjudge
14GitHub stars
Local Jev-compatible decision server for Macs that reads answer probabilities from Qwen next-token logits in one forward pass, with no text generation or JSON parsing.
Jev Demos & Experiments#community#jevbest#catalog-import
CommunityMicha0827/snapjudgePython
jev-cli
22GitHub stars
Command-line toolkit that wraps Jev judgments into scriptable verify, screen, classify, extract, find, rerank, match, route, ask, compact, and batch commands.
Jev Agents & MCP#community#jevbest#catalog-import
CommunityNasrallah-AL/jev-cliTypeScript
zevals
11GitHub stars
TypeScript evaluation utilities that test full AI agent conversations as end-to-end scenarios with binary assertions, without imposing a test runner.
Jev Agents & MCP#community#jevbest#catalog-import
Communityopencx-labs/zevalsTypeScript
Bev
12GitHub stars
Local HTTP API that scores 2-255 candidate options per field with a redistributed ternary GGUF, returning typed Choice, Noul, and Score answers as structured JSON.
Jev Demos & Experiments#community#jevbest#catalog-import
CommunityReza2kn/BevPython
gut
18GitHub stars
Elixir DSL where Gut.feel/4 maps a subject and question to one offered choice, using Jev, any ReqLLM model, local Ollama, or a custom adapter.
Jev Integrations & Adapters#community#jevbest#catalog-import
Communityvinibrsl/gutElixir
pi-jev-router
11GitHub stars
Pi Coding Agent extension that routes only at task boundaries, using Jev judgments plus declared capabilities, availability, price estimates, and failure state.
Jev Agents & MCP#community#jevbest#catalog-import
Communitywin4r/pi-jev-routerTypeScript
jev_antispam_bot
17GitHub stars
Minimal grammY Telegram bot that sends each new or edited group message to Jev once and deletes only the linked campaign suffix above a 0.81 cutoff.
Jev Tools & CLIs#community#awesomejev#catalog-import
Communitybackmeupplz/jev_antispam_botTypeScript
liteagents
38GitHub stars
Python SDK that runs the same prompt, tools, and MCP setup across DeepAgents, Pydantic AI, Claude Agent SDK, Codex, and OpenCode by switching harness.
Jev Agents & MCP#community#jevbest#catalog-import
CommunityBerriAI/liteagentsPython
jev
42GitHub stars
Claude Code plugin with jev find, jev ask, and a Read hook that keeps large-file context out of the agent by scoring relevance with Jev.
Jev Agents & MCP#community#jevbest#catalog-import
CommunityBorisLeMeec/jevGo
jevwire
24GitHub stars
Wires Jev into agents as seven MCP tools, an embeddable JevDecisionModel library with run functions, and Claude Code hooks at tool and turn boundaries.
Jev Agents & MCP#community#jevbest#catalog-import
CommunityBrainwires/jevwireTypeScript
evoke
25GitHub stars
Sentence-driven runner where one command is matched to installed reflex programs, planned up front with per-step probabilities and gates.
Jev Agents & MCP#community#jevbest#catalog-import
Communityevoke-build/evokeRust
algal
21GitHub stars
Language and VM for agent programs that wait for approval, survive restarts, and replay portable receipts without recalling the model.
Jev Integrations & Adapters#community#jevbest#catalog-import
Communityhraness/algalTypeScript
JevLint
12GitHub stars
Semantic lint that checks code against plain-English conventions via Jev and reports file-level violation probabilities for agents and CI.
Jev Agents & MCP#community#jevbest#catalog-import
Communityhuntedman/JevLintTypeScript
dejevu
11GitHub stars
Python browser agent that reads one lean page view per state and answers with a single JSON action, using any OpenAI-compatible model with no decision API or browser daemon.
Jev Practices & Patterns#community#jevbest#catalog-import
Communityidovmamane/dejevuPython

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.

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 3904 entries from 293 source sites, last updated Nov 5, 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. 3904 of the 3904 entries carry one today.

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