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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
3,889
Categories
11
Official
102
Community
3,787
Source sites
293
Deep dives
3,889

By format

3889
  • Docs169
  • Repos & sites3090
  • Videos74
  • Posts103
  • Articles377
  • Playgrounds76

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 3889 Jev AI model resources

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

Showing 3793–3840 of 3889 resources

Cookbook: Structure Recovery
Reconstruct Markdown from unformatted text in two requests: 16 Noul line-pair questions stitch split sentences, then 62 questions classify each block's type and companions.
Jev CookbooksDocs#official#cookbook#formatting
Official
Cookbook: Autoresearch Feature Discovery
Turn wine tasting notes into 67 numeric columns for a CatBoost regressor: five rounds of reading its own errors cut held-out RMSE from 3.09 to 1.77 across 800 unseen reviews.
Jev CookbooksDocs#official#cookbook#research
Official
Cookbook: Pre-Parsed Value Extraction
Regex finds candidate emails, phone numbers, and amounts; Jev picks the requested span so code copies a verbatim value that cannot be invented, with no free-text extraction required.
Jev CookbooksDocs#official#cookbook#extraction
Official
TypeSafe Is Out of Stealth
TypeSafe AI's official launch post: the company is out of stealth and developers can get access to Jev from the website, alongside the founder's launch thread.
Jev Guides & ArticlesPost#official#x#launch
Official
Jev on Vercel AI Gateway (Announcement)
TypeSafe's announcement that Jev is available on the Vercel AI Gateway, linking the model page with the Jev API, pricing, and playground.
Jev Tools & CLIsPost#official#x#vercel
Official
Foreman
772GitHub stars
A Python asyncio runtime that puts Jev in a supervision loop above Codex or OpenCode workers: it judges completion, test sufficiency, and stuck loops, then steers, retries, or stops the job.
Jev Tools & CLIs#community#python#coding-agent
Communitythruwire/foremanPython
Jev Review
687GitHub stars
A staged code-review workflow that uses Jev for bounded judgments over Git diffs or whole codebases, with a local dashboard. Policy and thresholds stay in code while Jev screens five risk areas.
Jev Tools & CLIs#community#typescript#code-review
Communitydevagrawal09/jev-reviewTypeScript
TypeSafe Mario
452GitHub stars
An experimental controller that has Jev choose NES inputs to play Super Mario Bros. from structured emulator telemetry instead of screenshots, logging every decision with probabilities and latency.
Jev Cookbooks#community#python#games
Communityfhshaik/typesafe-marioPython
Jev Search
538GitHub stars
A web-search app where Jev picks sources, time ranges, and query terms, then ranks results from a dozen engines through Search1API, returning links and relevance scores instead of generated answers.
Jev Tools & CLIs#community#typescript#search
Communitysuperagents-lab/jev-searchTypeScript
pg-jev
1.2kGitHub stars
A PostgreSQL extension that filters, ranks, and classifies table rows with plain-language conditions judged by Jev, batching 20 rows per request and caching answers per session.
Jev Tools & CLIs#community#postgres#sql
CommunityrealZachi/pg-jevShell
Jev Browser
339GitHub stars
A browser-use agent where Jev picks one action per step from a page's interactive elements. Runs as an MCP server, CLI, or library and returns a step trace, screenshot, and console errors.
Jev Tools & CLIs#community#typescript#mcp
Communityjkudish/jev-browserJavaScript
Jev MCP
539GitHub stars
An MCP server exposing ten Jev judgment tools, including verify, screen, find, rerank, classify, review, and gate, each returning typed probabilities in roughly 150 to 500 ms.
Jev Tools & CLIs#community#typescript#mcp
Communityjkudish/jev-mcpJavaScript
voice-browser
411GitHub stars
Control a headed Chromium window by voice: one Jev request per partial transcript decides intent, target, and completeness in roughly 300 ms, while code applies thresholds and builds the action.
Jev Tools & CLIs#community#javascript#browser
Communitymoritzkremb/jev-voice-browserJavaScript
Typesafe MCP
353GitHub stars
A single-binary Go MCP server exposing one evaluate tool for noul, choice, and score questions, with one-command registration for Claude Code, Claude Desktop, and Codex.
Jev Tools & CLIs#community#go#mcp
Communityitsmostafa/typesafe-mcpGo
Building with Jev
155GitHub stars
An agent skill for writing and improving programs that call Jev: question design, state structure, answer composition, confidence thresholds, and how to diagnose a question that keeps coming back wrong.
Jev Practices & Patterns#community#skills#claude-code
Communitydbreunig/building-with-jev-skill
jev-pruner
164GitHub stars
A Claude Code plugin that trims long Bash output after a command runs but before the model sees it: irrelevant chunks are dropped with omission markers while errors, diffs, and code are preserved.
Jev Tools & CLIs#community#typescript#claude-code
Communitytamaratran/jev-prunerTypeScript
jev-semgrep
150GitHub stars
Grep by meaning instead of regex: Jev scores every line, meanings combine with AND, OR, and NOT, and one query matches across Japanese, French, German, Spanish, and more.
Jev Tools & CLIs#community#javascript#cli
Communityuehaj/jev-semgrepJavaScript
pi-jev
165GitHub stars
A Pi coding-agent extension with Jev as a decision layer: a gate judges bash, write, and edit calls before they run, and an output judge flags leaked secrets and classifies failures.
Jev Tools & CLIs#community#typescript#coding-agent
Communityy0usaf/pi-jevTypeScript
Advocaat
99GitHub stars
A small TypeScript client for asking typed questions about your data: one ask call mixes yes/no, choice, and score questions and returns probabilities, selected options, and confidences.
Jev Repos & SDKs#community#typescript#sdk
Communitypithings/advocaatTypeScript
SkillRanker
135GitHub stars
A Rust CLI that ranks agent skills for the next step with a two-stage Jev pass plus lexical prefiltering, with Claude Code hooks, a TUI, abstention, and --why-not explanations.
Jev Tools & CLIs#community#rust#cli
CommunityDicklesworthstone/skillrankerRust
jev-drone
277GitHub stars
A camera-only MuJoCo quadrotor that uses Jev for tactical maneuvers at 2.5 Hz while classical perception and a 50 Hz reflex layer keep safety outside Jev, clearing a five-station course.
Jev Cookbooks#community#python#robotics
CommunityRomanSlack/jev-dronePython
pg_typesafe
88GitHub stars
A pre-alpha PostgreSQL extension for categorical work in SQL: Noul, Choice, and Score functions plus batched variants that classified 38 strings in two requests.
Jev Tools & CLIs#community#postgres#sql
Communitygiuliosmall/pg_typesafeC
jevmeter
109GitHub stars
Render a live Jev meter over any video: Whisper transcribes, every sentence is scored, and ffmpeg exports a 16:9 edit with flags and a scoreboard. Presets cover debates, calls, and pitches.
Jev Tools & CLIs#community#python#video
CommunityChetasLua/jevmeterPython
jev-shell-history
119GitHub stars
Fish-style zsh autosuggestions ranked by Jev: each keystroke asks which of your last 100 distinct history entries you are completing and shows the best match for one-key acceptance.
Jev Tools & CLIs#community#typescript#zsh
Communitymrnugget/jev-shell-historyTypeScript
jevcache
77GitHub stars
A local decision ledger for Jev-class models: caches decisions keyed by redacted model, schema, and state, replays them deterministically in CI, and publishes bundles without raw state.
Jev Tools & CLIs#community#rust#caching
Communityhyperspaceai/jevcache
Jev Python Tutorial: Classify and Score Requests
A Python walkthrough of typesafe-sdk: sync and async clients, grouping answers into choices, scores, and nouls, and routing uncertain cases to review, with arithmetic kept in Python.
Jev Guides & ArticlesArticle#community#tutorial#python
Community
How to Use Jev: A Practical Guide
A practical guide through SDK setup, the three primitives, and five patterns including speculative fan-out, confidence-gated routing, composite scoring, and a retrieval-then-judge cascade.
Jev Guides & ArticlesArticle#community#tutorial#python
Community
AI That Doesn't Talk: A Plain-English Guide to Jev
A plain-English guide to Choice, Score, and Noul with Python and curl examples, confidence-gated branching for support, moderation, and fintech, plus a skeptical read of the benchmarks.
Jev Guides & ArticlesArticle#community#guide#python
Community
What Can You Build With Jev? Documented Use Cases
A map of documented Jev use cases, routing, guardrail verification, citation checking, reranking, rubric scoring, bulk classification, and semantic linting in CI, each with a confidence policy.
Jev Practices & PatternsArticle#community#routing#evaluation
Community
Jev in the Agent Runtime
An engineering note that places Jev as a typed micro-decision layer inside an agent harness rather than a planner, with preconditions for confidence gates and fan-out and a runtime split into five parts.
Jev Practices & PatternsArticle#community#agents#routing
Community
Typed Decision Models: Jev and Laya in Agentic AI
A comparative review of Jev and the open-source Laya encoder: interfaces, deployment, disclosed internals, calibration claims, and the limits of agreement-based workflow evals.
Jev Practices & PatternsArticle#community#evaluation#calibration
Community
Building a Harness with Jev (LangChain)
LangChain's langchain-typesafe integration exposes Jev as a TypeSafeClassifier plus experimental model-routing and auto-mode middleware that screens risky tool calls before execution.
Jev Tools & CLIsArticle#community#integration#python
Community
Jev Launch Post
Diogo Almeida's launch thread: after co-inventing ChatGPT, he spent two years on RLCD and Jev, a System One model he pitches as 20-200x faster and 40-400x cheaper for typed decisions.
Jev Media & TalksVideo#community#x#video
Community
Jev Trading Bot Demo
A video demo of a bot that asks Jev to decide buy or sell from a live price feed, then places real orders on Kuru's on-chain order book on Monad every 300ms block.
Jev CookbooksVideo#community#x#video
Community
Classifying 1,500 Real Emails
vogel ran Jev over 1,500 of his own emails to test classification quality and posted the results as a video, calling it the most impressive model he has tried for the task.
Jev CookbooksVideo#community#x#video
Community
Browser Use with Jev + Stagehand
Kyle Jeong's demo of browser use with Jev and Stagehand: the accessibility tree is the state, actions are the questions, and one remote-browser task cost $0.001 at near-instant speed.
Jev CookbooksVideo#community#x#video
Community
Jev as an LLM Judge
Yuchen Jin's take on Jev for LLM-as-a-judge work: 20-200x faster and 40-400x cheaper, with a screenshot of the model picking which candidate is AGI after a prompt sweep under $0.10.
Jev Practices & PatternsPost#community#x#evaluation
Community
Fast Jev Compaction Demo
Tamara's demo of fast-jev-compaction for Claude Code: instead of summarizing context, Jev scores every tool call and drops the irrelevant ones, with a video of it running.
Jev Tools & CLIsVideo#community#x#video
Community
Claude Context Cut from 1M to 86K
Alex Volkov reports that a Jev-powered Claude plugin reviewing unnecessary tool calls cut a session from nearly 1M to 86K tokens in about one second, with the install prompt in the post.
Jev Tools & CLIsPost#community#x#claude
Community
Vercel fx Safety Reviewer on Jev
Guillermo Rauch says the fx auto-mode safety reviewer, currently on GPT Luna, is up to 18x faster at p95 and more accurate with Jev, and that Jev is coming to Vercel AI Gateway.
Jev Tools & CLIsPost#community#x#vercel
Community
Jev Launches on OpenRouter
OpenRouter's beta announcement for Jev: state plus typed questions returns typed decisions with probabilities, so there is no JSON prompting, parsing layer, or output validation.
Jev Tools & CLIsVideo#community#x#video
Community
Jev-Powered Browser Use Preview
dax previews how fast browser use can be with Jev as the decision layer and OpenCode's browser-use CLI, quote-posting a demo video of the loop in action.
Jev CookbooksPost#community#x#browser
Community
700 Leads Scored for $0.09
Gojiberry's Romàn reports scoring 700 high-intent leads and personalized outreach messages in 40 seconds for $0.09, with confidence scores and lead-message mismatch detection.
Jev CookbooksVideo#community#x#video
Community
Jev Beats Gemini Flash Lite on a Classifier Eval
Vercel CTO Malte Ubl reports that Jev beat an existing classifier eval previously run on Gemini 2.5 Flash Lite, saturating the eval on quality and running 6x faster.
Jev Practices & PatternsPost#community#x#evaluation
Community
Browser Use Ultrafast with Jev
Browser Use's Ultrafast agent puts Jev in charge of picking each browser action from a dynamic DOM action space. The author reports a flight search in 7 seconds for about $0.0039.
Jev Tools & CLIsVideo#community#x#video
Community
Jev as a Really Smart Switch Statement
A hype-free framing of Jev: not a replacement for GPT or Claude, but a new tool class for fast, cheap structured decisions, like 2016-era classifiers with 2026-level intelligence.
Jev Guides & ArticlesPost#community#x#explainer
Community
When a Designer Gets Jev
A 33-second demo clip captioned "when a designer gets access to Jev", among the most-liked organic Jev posts, showing a polished interface built on top of typed decisions.
Jev CookbooksVideo#community#x#video
Community
Jev Projects Roundup Thread
A curated thread of the strongest Jev community projects found on X within the first days of launch, from the creator behind the Jev voice browser and a full video tutorial.
Jev Guides & ArticlesPost#community#x#roundup
Community

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 3889 entries from 293 source sites, last updated Nov 4, 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. 3889 of the 3889 entries carry one today.

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