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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 3121–3168 of 3904 resources

jev-page-verdict
1GitHub stars
Manifest V3 Chrome extension that asks nine parallel Jev questions about the page you are on to separate advertising from first-hand account, across genre, stance, publisher, product and four Noul checks.
Jev Demos & Experiments#community#awesomejev#catalog-import
Communitytorumitsutake/jev-page-verdictJavaScript
dgp
0GitHub stars
Decision Graph Protocol from Numerous ApS: the app publishes an immutable frame of evidence and offered decisions, an eligible assessor returns a typed assessment, and the app's own guards authorize the commit.
Jev Agents & MCP#community#awesomejev#catalog-import
Communitynumerous-com/dgpPython
jev-judge
0GitHub stars
Dependency-free Python 3 CLI that hands a JSON state plus 1 to 16 named Noul, Choice or Score questions to Jev and prints typed answers, usage and elapsed time without echoing the state back.
Jev Agents & MCP#community#awesomejev#catalog-import
Communityohmyjiro/jev-judgePython
jev-gates
0GitHub stars
Claude Code plugin with nine Jev-judged gates over edits, prompts, shell commands, stops and commits. Each one escalates to a permission prompt, and none of them can approve an action.
Jev Agents & MCP#community#awesomejev#catalog-import
CommunityrashedInt32/jev-gatesJavaScript
jev-reach
1GitHub stars
MCP server that layers a reach tool onto chrome-devtools-mcp: Jev picks each click and typed value so your agent states a goal once, then makes one devtools call at the destination.
Jev Demos & Experiments#community#awesomejev#catalog-import
CommunityrashedInt32/jev-reachTypeScript
minojev
13GitHub stars
Local decision models that return Jev-shaped typed distributions instead of generated text: freeze a backbone, cache candidate features once, train a roughly 0.8M-parameter decision head, calibrate per primitive.
Jev Practices & Patterns#community#awesomejev#catalog-import
Communityzeredy879/minojevPython
jev-acp
1GitHub stars
ACP stdio agent that evaluates explicit Choice, Score and Noul questions as typed Jev answers inside any Agent Client Protocol client or IDE, driven by a task picker rather than free-form chat.
Jev Integrations & Adapters#community#awesomejev#catalog-import
Communityformulahendry/jev-acpTypeScript
voice_control
1GitHub stars
Unreleased Rails engine that turns Ruby-defined commands into voice and typed shortcuts, using Jev to interpret free-form phrasing while your own authorize callbacks keep the permission decision.
Jev Integrations & Adapters#community#awesomejev#catalog-import
Communityigorkasyanchuk/voice_controlJavaScript
jevtraces
0GitHub stars
Alpha OpenTelemetry Collector processor that scores operation metadata with three Jev noul questions, caches the result, and writes it onto later matching spans as jevtraces.operation annotations.
Jev Integrations & Adapters#community#awesomejev#catalog-import
Communityishantanu/jevtracesGo
switchboard
19GitHub stars
Apache-2.0 router that runs inside Claude Code or Codex: Jev classifies the task, a local policy picks the model and reasoning effort, and the pair stays pinned for the whole conversation.
Jev Agents & MCP#community#awesomejev#catalog-import
Communityruban-24/switchboardTypeScript
kojev
9GitHub stars
Unofficial Kotlin Multiplatform client for Jev across JVM, Android and iOS. You declare the decision as an enum implementing Criterion and read back typed answers, distributions and confidence.
Jev Repos & SDKs#community#awesomejev#catalog-import
CommunityItisNoMatter/kojevKotlin
yardsort
11GitHub stars
GPL-3.0 desktop app for Linux, macOS and Windows that gives every coding-agent task its own git worktree and its own terminal, with live diffs and optional Jev review of changed files.
Jev Agents & MCP#community#awesomejev#catalog-import
Communityjoaoh82/yardsortRust
coffee-under-fire
0GitHub stars
A React and Three.js coffee-delivery arena shooter whose enemies score their own tactics locally, with a decision record explaining why Jev was retired from that job.
Jev Demos & Experiments#community#awesomejev#catalog-import
Communityjoaoh82/coffee-under-fireTypeScript
snbt-jev-bench
1GitHub stars
Jev run against a community reconstruction of Indonesia's SNBT 2025 entrance exam: 159 remembered questions across seven subtests, 156 scored, with every request payload and response kept.
Jev Practices & Patterns#community#awesomejev#catalog-import
Communitymisaalya/snbt-jev-benchPython
Documentation
TypeSafe's official docs: the System One introduction, the three question primitives, confidence, composable patterns, cookbooks, and the HTTP API and SDK references.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
Parallel Constrained Decoding (Qwen2.5-1B-RLCD)
A Hugging Face Space by drinkmoonshine for parallel constrained decoding. The captured page gives the name and owner only, with no Jev or System One detail anywhere.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
Computer use built on Jev
A computer-use loop built on Jev: OCR the screen, attach bounding rects to text areas, then ask Jev which item moves the goal forward and click that item.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
Jev Typewriter launch
Steve Krouse posted a playable hosted Jev demo and linked to it. The thread describes the demo not at all; a reply raises a $2 budget and a complaint about speed.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
Jev vs Qwen on Cerebras
A developer rebuilt the same app on Cerebras with Qwen 3.8 27B and reports TypeSafe was cheaper and beat it on performance at similar quality. The benchmark itself is not shown.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
Hide posts on X with natural language
A browser extension that hides or collapses individual posts on X from natural-language rules, using Jev to judge each post. The announcement names no install, code or rule syntax.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
agentgateway Jev guardrail example
An agentgateway example that scores prompts and responses for jailbreaks, harmful content and secret disclosure with Jev, rejecting anything scoring 2 or above with HTTP 403.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
Jev Classifier
A browser tool where you paste a Telegram channel JSON export and each post gets four Jev labels: category, quality, sentiment and reaction tone, written out as result.json.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
dmx.to
DMX is a $19 macOS X client that embeds the real x.com interface for DMs and notifications while capping timeline browsing at five minutes an hour. No Jev integration is documented.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
Model router CLI
A CLI where you give it a task plus the AI subscriptions you already have, and Jev picks which agent or model should handle it, paired with Herdr to route from one terminal.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
Support ticket classifier
A small support ticket classifier where Jev decides category, urgency and whether a ticket needs a human, replacing a GPT-based version of the same flow.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
ConsoleChaosRacing driven by Jev
A Japanese-language post where a game developer wired ConsoleChaosRacing to a typesafe system_one through a Python API and a display UI, letting the model supply driving decisions on a fixed course.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
skillbox + Jev skill routing
kitze's skillbox serves a whole skills library over one MCP server, and adding Jev turns it into a router: the model reads the query and returns the relevant skills instead of the agent spending turns searching for them.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
jev-rabbit PR review bot
An announced-in-progress PR review bot: Jev evaluates a pull request against rules you write in plain English, aimed at the review conditions that are awkward to express in TypeScript or linter configuration.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
TrainLCD Jev rerank
A merged TrainLCD pull request that adds a typesafe noul to re-select which stations the AI chat suggests, wired into the request path but inert by default until a KV threshold arrives.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
StarCraft Brood War WASM MCP demo
A short demo post: StarCraft Brood War running in WASM is exposed as an MCP server, Jev is given the game as a tool, and the recorded run still loses to a Zerg rush.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
Spanish AEPD corpus test
A write-up of running a typesafe classifier against a Spanish legal corpus, replacing a hand-built regex with a probability, plus a thread arguing its best fit is as a pre-filter in front of an expensive model.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
Tabletop MMORPG action mapper
A developer mapping free-text player intent to typed server actions for a text MMORPG with tabletop-RPG freedom, reporting 96% run-to-run agreement at 317 ms median against a 6.52-second previous setup.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
Jev in 34 seconds
A 34-second video post from a design engineer who spent an evening reading up on Jev and condensed it into the clip, with the substantive examples appearing in the replies rather than the post.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
Wiki-link clicker demo
A page-by-page demo in which each wiki page yields a set of link candidates and Jev picks which one to click toward a stated goal, its author calling it simple and the speed the notable part.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
Verdict (Open-jev) launch thread
An open-source reproduction called Verdict: a post-trained 151M ModernBERT-base encoder with a GLiClass head, runnable in a browser tab, reporting its own calibration, order-invariance and failure numbers.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
Search with Jev and Milvus
Milvus bootcamp notebooks pairing vector retrieval with typesafe judgments across nine search scenarios: reranking, context filtering, stopping criteria, routing, cache reuse, guardrails, curation and evaluation.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
Best Jev Projects (jevbest.com)
A searchable companion site to the heyjunpenn awesome-jev list: 962 GitHub projects with stars, languages, and one-line Jev decision summaries per repo.
Jev Guides & Articles#community#awesome-list#evaluation
Community
LangWatch
5kGitHub stars
LangWatch Instant Evals ships a TypeSafe Jev classifier that batches Noul, Score, and Choice judgments on production traces in one POST per text.
Jev Benchmarks & Evaluations#community#typescript#evaluation
Communitylangwatch/langwatchTypeScript
GenOffice
9.9kGitHub stars
An open-source AI office suite whose local file search reranks the top 20 FTS hits with TypeSafe Jev relevance scores before showing results.
Jev Tools & CLIs#community#typescript#desktop
Communitygenspark-ai/genofficeTypeScript
LiteLLM
61.5kGitHub stars
LiteLLM's proxy adds TypeSafe guardrail hooks and a Jev complexity classifier for policy judgments and request routing across 100+ model providers.
Jev Integrations & Adapters#community#python#gateway
CommunityBerriAI/litellmPython
oh-my-pi
35.8kGitHub stars
Stencil Labs' coding agent embeds TypeSafe Jev for typed checks, routing, and workflow decisions, with measured Jev tokenizer probes in pi-natives.
Jev Agents & MCP#community#typescript#coding-agent
Communitycan1357/oh-my-piTypeScript
OpenWork
24.2kGitHub stars
An open Claude Cowork-style workspace whose eval testkit can call Jev as a typed verification judge on agent-produced artifacts.
Jev Benchmarks & Evaluations#community#typescript#agents
Communitydifferent-ai/openworkTypeScript
XERJ
7.9kGitHub stars
An Elasticsearch-compatible autoindex search layer that optionally sends top hits to TypeSafe Jev and reorders results by relevance scores.
Jev Tools & CLIs#community#rust#search
Communityxerj-org/xerjRust
OpenRouter AI SDK provider
691GitHub stars
The Vercel AI SDK provider for OpenRouter, including openrouter.decisionModel for typesafe/jev-1.13 evaluations with providerMetadata answers.
Jev Integrations & Adapters#community#typescript#openrouter
CommunityOpenRouterTeam/ai-sdk-providerTypeScript
LocalJev
828GitHub stars
A local Jev-compatible POST /v1/systemone server in TypeScript that maps typed questions onto oMLX classification prompts and normalizes logprob-style answers.
Jev Models & Reimplementations#community#typescript#local
Communitygithubnext/localjevTypeScript
SemIf-OpenJev
4.8kGitHub stars
An open-model semantic-if engine positioned as a local Jev-style decision stack, separate from the original SemIf repo but sharing the same author.
Jev Models & Reimplementations#community#python#open-models
CommunityTheoLeeCJ/SemIf-OpenJevPython
Jeeves
425GitHub stars
PostHog's reasoning Jev-style classifier with a diffusion drafter, reporting higher accuracy than Kev-9B and hosted Jev on held-out and JevBench tiers.
Jev Models & Reimplementations#community#evaluation#open-models
CommunityPostHog/jeevesPython
FluidUse
521GitHub stars
Local macOS computer-use automation on Apple silicon using on-device laya typed decisions and CUA-S1-FORMS for filling, via the Accessibility API.
Jev Demos & Experiments#community#browser#local
CommunityFluidInference/FluidUseSwift

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.