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.
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- 3,739
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- 11
- Official
- 102
- Community
- 3,637
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- 292
- Deep dives
- 3,739
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3739- Docs169
- Repos & sites2980
- Videos73
- Posts103
- Articles344
- Playgrounds70
Updated
Browse the Jev AI model by category
11 ways into the ecosystem. Each category page leads with its own shortlist of starting points.
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The same directory, sliced by what you are building and who you are building it for.
All 3739 Jev AI model resources
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Showing 1–48 of 49 resources
A 144.3M-parameter bilingual typed decision model fine-tuned from jhu-clsp/mmBERT-small: it answers noul, choice, and score questions in one forward pass with calibrated confidence and zero output tokens, and it runs on CPU.
Jev Models & Reimplementations#community#catalog-import#cobanov
A native Swift implementation of OpenJev, the Jev-compatible typed-decision server: send a state and typed questions over a Jev-compatible HTTP API and read every answer from model probabilities, on Apple silicon Macs or inside iPhone and Mac apps.
Jev Repos & SDKs#community#catalog-import#cobanov
Community
algorythm-canada/openjevswiftSwift
algorythm-canada/openjevswiftSwiftPlugs Jev-style decision models into published rerankers as a fast primitive: one forward pass over k candidates, zero decoded tokens. On T2Ranking it reports up to 22x faster matches than a generative listwise reranker at 2.9x the nDCG@10.
Jev Repos & SDKs#community#catalog-import#yibie
Community
hgqimo/jevrankerPython
hgqimo/jevrankerPythonProbabilistic control flow for TypeScript: Hunch asks a System One model such as Jev yes/no questions, thresholded booleans, picks and ratings, and returns typed answers you can branch on in ordinary code.
Jev Repos & SDKs#community#catalog-import#cobanov
Community
carldaws/hunch-tsTypeScript
carldaws/hunch-tsTypeScriptA Chrome extension that sorts Hacker News comments into buckets you define: Jev answers one Choice question per comment in about 300 ms, and each comment gets a coloured label with its bucket and probability.
Jev Tools & CLIs#community#catalog-import#yibie
Community
ritza-co/hn-jev-sorterJavaScript
ritza-co/hn-jev-sorterJavaScriptA GitHub Action that reviews every pull request with TypeSafe Jev and fails the check when it finds a problem. It asks four yes/no questions about each part of the diff and compares files that look duplicated, catching secrets, vulnerabilities, needless complexity and prompt injection.
Jev Integrations & Adapters#community#catalog-import#yibie
Community
turenlabs/lisaPython
turenlabs/lisaPythonA testing app and CLI for chat endpoints: send messages to any chat API, watch replies stream in as a conversation, and check every reply with rule checks (JSONPath, latency, tokens, cost, tool calls) and judged checks including TypeSafe's System One. Export the suites as files and run them in CI.
Jev Tools & CLIs#community#catalog-import#yibie
Community
abhimanyupandian/hafenJavaScript
abhimanyupandian/hafenJavaScriptA website companion's code: a page's actions are offered as WebMCP tools, a visitor's request becomes one Jev Choice, and a three.js voxel character hops to the button and does it.
Jev Demos & Experiments#community#catalog-import#cobanov
Community
cwdx/jevvieTypeScript
cwdx/jevvieTypeScriptA git pre-commit hook that asks TypeSafe Jev whether each new file belongs in your repo, catching scratch scripts, debug dumps, build output and local config before they land. Local rules run first, so .env and .DS_Store are matched locally and never sent anywhere.
Jev Tools & CLIs#community#catalog-import#cobanov
Community
eve2512/strayguardPython
eve2512/strayguardPythonA Claude Code mod that adds $.jev to the engine so other mods can ask TypeSafe Jev typed Choice, Score and Noul questions and get calibrated probabilities back. Answers are validated against their questions, keys are kept in the keychain, and calls time out at 4 seconds by default.
Jev Integrations & Adapters#community#catalog-import#yibie
Community
gecm0/jev-modTypeScript
gecm0/jev-modTypeScriptAn e-commerce after-sales customer-service agent built on the learn-claude-code skeleton. Every turn asks Jev for the customer's intent with a confidence and a needs-human probability in one call, and a pure-code gate sends low-confidence cases to a human before the LLM runs.
Jev Agents & MCP#community#catalog-import#yibie
Community
guow7394/ecom-cs-agentPython
guow7394/ecom-cs-agentPythonAn open-source no-limit Texas Hold'em game for two to six human and AI players, with TypeSafe Jev, Equity Rules, Upright Eevo and configurable LLM bots as opponents. The poker engine stays authoritative for cards, turns, betting, pots and winners.
Jev Tools & CLIs#community#catalog-import#yibie
Community
jonime/ai-holdemTypeScript
jonime/ai-holdemTypeScriptA Codex and Claude Code Stop hook that detects overloaded multi-topic messages and forces the agent to present issues one at a time with context and missing info, using two Jev Choice questions behind confidence thresholds.
Jev Integrations & Adapters#community#catalog-import#cobanov
Community
lucaminudel/jev-unpack-hookPython
lucaminudel/jev-unpack-hookPythonAn OpenCode V2 plugin that asks TypeSafe Jev whether a prompt is deterministic before the LLM reasons, injecting a JEV PRE-ANALYSIS block and temperature 0 for deterministic turns so simple prompts skip chain-of-thought. Jev failures fail open and the session continues normally.
Jev Integrations & Adapters#community#catalog-import#yibie
A pre-action gate for tool-using agents that decides allow, confirm or block with deterministic rules before a neural decider, plus a CDP browser loop whose decider swaps between hosted Jev and a local System One-compatible server through environment variables alone.
Jev Tools & CLIs#community#catalog-import#yibie
Community
pusucip25/local-deciderPython
pusucip25/local-deciderPythonA benchmark comparing TypeSafe Jev with Claude Haiku 4.5 as input guardrails across jailbreak, evasion and benign prompts, measuring detection rates, false positives, latency and cost. At n=1,000 Jev traded some detection for a 328 ms median latency and $0.03 per 1K calls versus Haiku's 2,066 ms and $1.87.
Jev Benchmarks & Evaluations#community#catalog-import#yibie
Local spam and phishing triage for a Proton Mail Bridge inbox on macOS: Jev answers two questions per new message, answers are recorded in dry-run by default, and mail moves to a Jev Review folder only if you turn that on. Nothing is ever deleted.
Jev Tools & CLIs#community#catalog-import#yibie
Community
soderlind/jev-mail-triagePython
soderlind/jev-mail-triagePythonThe companion source code for the book Mastering TypeSafe Jev: 13 chapters plus two appendices build two capstones on one shared decision client — an autonomous incident and FinTech triage engine on hosted Jev, and a SmartPlant industrial-IoT engine on self-hosted open-source Kev.
Jev Guides & Articles#community#catalog-import#yibie
ABTdomain's workflow design for brand-protection review: three layers of typed Jev questions turn each new domain that carries a brand word into Release, Watch or Flag, with 0.3 and 0.7 probability lines deciding what happens next.
Jev Practices & PatternsArticle#community#catalog-import#yibie
Community
An 11-page working paper on placing a small commercial text judge beside a live trading lab: six tests for a text signal, what the judge may and may never touch, and the plumbing failures that corrupted its readings. No profitability claims.
Jev Practices & PatternsArticle#community#catalog-import#yibie
Community
AnyEval's paired JevBench comparison of jev against gev-1.0 on 231 shared problems: the win table, an exact McNemar result, and end-to-end answer times for both models measured in one fixed stratum.
Jev Benchmarks & Evaluations#community#catalog-import#yibie
Community
Benchmark Heaven's live JevBench board for typed decision models: florianstandhar's reproducible benchmark, presented with frozen versioned rankings, price bases, hosting and confidentiality filters, and per-model evidence requirements.
Jev Benchmarks & Evaluations#community#catalog-import#madewithjev
Community
Blink enforces your team style guide, like AGENTS.md, by checking every file edit made by Claude Code and Codex and handing findings back to the agent inside the session in under half a second; it is mostly powered by Jev. Free public beta.
Jev Tools & CLIs#community#catalog-import#yibie
Community
ChemIllusion's post on how its structure autocomplete works: RDKit builds and checks every candidate from your drawing, and Jev picks which checked cards to show and in what order, in one request of about 0.2 seconds.
Jev Media & TalksPost#community#catalog-import#yibie
Community
A shared 1,000 by 1,000 emoji canvas where visitors paint and Jev paints alongside them: after each stroke it reads what is around it by name, weighs emoji that belong with it, and paints one or finishes a shape it is sure you meant.
Jev Demos & ExperimentsPlayground#community#catalog-import#cobanov
Community
Jevvie is the companion in the corner of every page on chriswijnia.com: ask it for something and Jev picks which of the page's actions you mean, one typed Choice at a time, then Jevvie hops over and does it. The same actions are WebMCP tools.
Jev Demos & ExperimentsPlayground#community#catalog-import#cobanov
Community
Microsoft's announcement of Microsoft-Decision-1, a model for fast decision scoring built for routing, classification, prioritization, verification and workflow control, available in Microsoft Foundry and through OpenRouter. Published 2026.10.09.
Jev Media & TalksPost#community#catalog-import#madewithjev
Community
Perry Link's Zenodo preprint compares three judgment layers - a local Laya judge, TypeSafe Jev and DeepSeek-V4.1-Flash - on the same 120-checkpoint task, reporting that cost is not the binding constraint, that p50 latency spans about 25-32x, and that the judges' self-reported fields fail in clustered ways.
Jev Benchmarks & EvaluationsArticle#community#catalog-import#cobanov
Community
Stephen Solka's Hugging Face article tests whether Jev can filter political fundraising from an inbox: a frozen 100-email eval, one noul question per email, then follow-on experiments that shrink the classifier to CPU-only inference with SetFit and ONNX Runtime.
Jev Media & TalksPost#community#catalog-import#yibie
Community
A Hugging Face Space that runs a tiny System One model entirely in the browser: type a prompt and the app produces output on the spot, with no server connection or installation required.
Jev Demos & ExperimentsPlayground#community#catalog-import#cobanov
Community
An independent lab for trying the Jev model: a customer-message example plus experiments for task routing, context selection and evidence checks. It shows choice, score and boolean answers with probabilities and can export the request as TypeScript.
Jev Demos & ExperimentsPlayground#community#catalog-import#yibie
Community
A directory of 2,086 open-source projects built on Laya, the open System One decision model, with category and platform filters, star counts, a live laya-mlx demo, and a hosted Laya + Clef API with $1 free credit.
Jev Guides & ArticlesArticle#community#catalog-import#cobanov
Community
Nish Tahir's tutorial on how decision models like Jev work: mask an LLM's vocabulary to the option tokens, read the softmax as a probability, then measure calibration and add temperature scaling, using Qwen3-1.7B.
Jev Guides & ArticlesPost#community#catalog-import#yibie
Community
A revenue-focused AI product manager that watches growth metrics across your data, investigates why numbers moved, and answers questions in Slack, over MCP or in its own charts. Self-hosting in your own cloud is offered alongside a free trial.
Jev Tools & CLIs#community#catalog-import#yibie
Community
RuntimeWire's report on Cloudflare extending its Clef decision models to audio and video: Clef-omni returns structured decisions from text, images, audio and video in one API call, while Clef-flash gets cheaper and its hosted context window shrinks.
Jev Media & TalksArticle#community#catalog-import#yibie
Community
Sayora's AI receptionist replaced production RAG with Jev for page picking and measured the change on 168 caller questions: wrong pages handed to the LLM fell from 33% to 3%, and the right page ranked first 88% of the time against 70%.
Jev Practices & PatternsArticle#community#catalog-import#yibie
Community
A social-scheduler founder's accuracy test of Jev: four yes/no questions over 522 captions, then the same questions for Fable on a random 100. Agreement reached 94/100 on promotion, and all 520 scored captions cost $0.011.
Jev Practices & PatternsArticle#community#catalog-import#yibie
Community
Tenuo's engineering write-up of safe-upgrade, a dependency-upgrade agent built on Jev, LangGraph and Tenuo: Jev turns repository evidence into typed probabilistic choices, the graph routes on confidence, and each action gets a short-lived task-scoped warrant.
Jev Practices & PatternsArticle#community#catalog-import#yibie
Community
Anton Zagrebelny's analysis: Jev's free output tokens and confidence-per-decision design push products toward two-model architectures and quietly break the way AI credits and entitlements are metered.
Jev Media & TalksArticle#community#catalog-import#yibie
Community
An independent playground for TypeSafe's Jev with clearly labeled modes: load Choice, Noul or Score examples for support routing, urgency and frustration, or run live calls against the real API when the page says live access is available.
Jev Demos & ExperimentsPlayground#community#catalog-import#yibie
Community
A free browser-based Texas Hold'em game where Quick Play seats you against five AI poker bots, or you can build a custom table for two to six players and share its link. Supported opponents include Equity Rules, TypeSafe Jev and configurable LLM bots.
Jev Tools & CLIs#community#catalog-import#yibie
Community
A Convex page for comparing models that answer verified multiple-choice questions about Convex, scoring them with source-weighted results and showing latency, cost and inspectable outcomes alongside the scores.
Jev Benchmarks & Evaluations#community#catalog-import#cobanov
Community
A walkthrough that pairs Unsiloed document extraction with Jev: extracted medication rows and their citations become Jev's state, one Noul question per row flags implausible or obscured doses, and the results decide which fields need review.
Jev CookbooksPost#community#catalog-import#yibie
Community
Viorant hosts TypeSafe's Jev as a remote MCP connector any MCP client can call: six tools cover typed decisions and compositions — jev_noul, jev_choice, jev_score, jev_verify, jev_screen and jev_find — with 2,500 Vio Credits in the Free Plan.
Jev Agents & MCP#community#catalog-import#yibie
Community
Yappy's macOS computer-use agent runs every step through Jev: the click, field and scroll are chosen from typed decisions over an accessibility text table, with no screenshots sent and a chat model called only when a step needs words.
Jev Integrations & Adapters#community#catalog-import#yibie
Community
elvex's Doyle Irvin walks through an internal prototype that wired Jev into the company's agent harness, from ambient classification while typing to attention filtering and risk-aware approvals; none of it is in production.
Jev Integrations & AdaptersArticle#community#catalog-import#yibie
Community
Trust middleware for Jev decision APIs: it logs every call, measures calibration in your domain as outcomes arrive, discounts stated confidence to what it is worth there, and signs the log for outside recomputation.
Jev Repos & SDKs#community#catalog-import#yibie
Community
A DeepSeek Harness auto mode hosted on GitLab: full-access automation guided by TypeSafe System One at every end prompt, MIT-licensed and created in September 2026.
Jev Agents & MCP#community#catalog-import#yibie
Community
Start here with the Jev AI model
Hand-picked entries the maintainers recommend first, from official primitives to community tools.
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
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
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.
AI SDK TypeSafe ProviderJev Integrations & Adapters
- Flow Steward Extension for TypeSafe AI (Jev)Jev Integrations & Adapters
Jev Arts & Human Taste Embeddings (Qwen3.6-35B-A3B-FP8)Jev Models & Reimplementations
- Jev Bookmark TriageJev Demos & Experiments
- Jev Consensus GateJev Agents & MCP
- Jev Game AgentJev Demos & Experiments
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 NewsReddit: 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 NewsHacker 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 NewsHacker 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 NewsHacker 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 NewsHow 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 3739 entries from 292 source sites, last updated Oct 25, 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. 3739 of the 3739 entries carry one today.
For the canonical details, read the official TypeSafe docs and the API reference.