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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 3553–3600 of 3904 resources

jev-go
6GitHub stars
An unofficial, dependency-free Go SDK for Jev's System One API with direct TypeSafe and Vercel AI Gateway providers, an interactive CLI, and an installable agent skill that covers request and retry semantics.
Jev Repos & SDKs#community#go#sdk
CommunityStumble/jev-goGo
Jev Reranker
4GitHub stars
A CLI that reranks, filters, or extractively compresses JSON retrieval results by asking Jev separate Noul questions, then lets Rust apply the order and thresholds, reading stdin and writing stdout.
Jev Tools & CLIs#community#rust#cli
Communityshinpr/jev-rerankerRust
jev-agent-failure-benchmark
4GitHub stars
A benchmark that runs Jev on all 6,257 text traces of Who&When Pro to attribute agent failures, scoring it with the official pinned scorer against the paper's GPT-5.4, Claude Sonnet 4.6, GLM-5, and Qwen3.5-122B baselines.
Jev Practices & Patterns#community#python#benchmarks
CommunityTokenTrim/jev-agent-failure-benchmarkPython
typesafe-sdk (Ruby client)
7GitHub stars
A Ruby client for TypeSafe's System One API that returns typed Noul, Choice, and Score answers, validates obvious input mistakes before spending a request, and pools HTTP connections across threads.
Jev Repos & SDKs#community#ruby#sdk
Communityjoshmn/typesafe-sdkRuby
Kev
9.3kGitHub stars
Apache-licensed, locally runnable Jev-style decision models (0.8B, 4B, 9B on Qwen3.5) with released weights, training code, a System One-compatible server, frozen eval suites, and a playground.
Jev Practices & Patterns#community#python#open-models
Communityjaredpalmer/kevPython
Jev Browser Use
1.2kGitHub stars
A Codex skill (with a plugin option) that hands clicks, toggles, navigation, and scrolling to Jev over accessibility text while Codex types, interprets visuals, and verifies the outcome.
Jev Tools & CLIs#community#javascript#skills
Communitywy-coliney/jev-browser-useJavaScript
OpenJev
721GitHub stars
An Apache-licensed System One decision server that reads Choice, Score, and Noul probabilities from DiffusionGemma 26B-A4B through vLLM on NVIDIA or MLX on Apple silicon, so TypeSafe SDKs work unchanged.
Jev Repos & SDKs#community#python#open-models
Communityrazorback16/openjevPython
openjev-sglang
333GitHub stars
A server that implements the TypeSafe/Jev HTTP API with Qwen3.6-35B-A3B on SGLang 0.5.19, deployed on Modal with radix caching and breakable prefill CUDA graphs, plus a separate FastAPI process.
Jev Repos & SDKs#community#python#open-models
Communityekzhang/openjev-sglangPython
neo4jev
174GitHub stars
A demo application that navigates a Neo4j graph one hop at a time: Jev gets the outgoing relationships as a Choice plus a goal Noul in one system_one call, and beam search follows the probabilities.
Jev Cookbooks#community#python#neo4j
Communityjexp/neo4jevJupyter Notebook
jev-browser
123GitHub stars
Unofficial browser automation where the calling LLM states the outcome and Jev decides each element, action, and value from a Playwright page snapshot. Ships as a library, CLI, and MCP server.
Jev Tools & CLIs#community#javascript#browser
CommunityYing-Kai-Liao/jev-browserJavaScript
winnow
112GitHub stars
A Claude Code context sieve: large Read, Bash, and Grep results are split into ~25-line blocks and judged by Jev before they enter context, with confident-no blocks replaced by a recallable stub.
Jev Tools & CLIs#community#python#claude-code
CommunityGhalebDweikat/winnowPython
ruby_decision_model
58GitHub stars
A Ruby client for Noul, Choice, and Score decision models, reaching OpenRouter by default or TypeSafe's native API, with no runtime dependencies beyond the standard library.
Jev Repos & SDKs#community#ruby#sdk
Communityobie/ruby_decision_modelRuby
Jev Moderation Bot
48GitHub stars
A self-hosted Discord bot that classifies messages with Jev in real time, deletes spam and scam links, escalates repeat offenses through warnings to timeouts, and profiles members from message history.
Jev Tools & CLIs#community#python#moderation
Communitybrainstormity/Jev-Moderation-BotPython
askjev
41GitHub stars
A Hermes skill that calls Jev as a typed tiebreaker: the agent submits a state and a question, and Choice, Score, or Noul answers with probabilities let it act or escalate.
Jev Tools & CLIs#community#python#skills
Communityshantanugoel/ask-jev-skillPython
SemDecide
80GitHub stars
A CLI that turns Jev into Unix pipeline primitives: is, choose, score, filter, and guard commands return typed verdicts, stable exit codes, and versioned JSON without prompt or parsing glue.
Jev Tools & CLIs#community#python#cli
Communitysharziki/semdecidePython
Open JEV
37GitHub stars
An independent local alternative to Jev: it takes English or Chinese context, questions, and candidate answers, and returns probabilities over the supplied candidates from a frozen Qwen3-4B backend.
Jev Repos & SDKs#community#python#open-models
Communityzhihz/openjevPython
Yoshi
31GitHub stars
An experimental local context-pruning proxy for Claude Code and Codex that asks Jev, through the Vercel AI Gateway, which history spans to omit, then forwards a rewritten request with omission markers.
Jev Tools & CLIs#community#typescript#compaction
Communitycompozy/yoshiTypeScript
jev-superpowers
35GitHub stars
An agentic software-development skill set built on obra/superpowers, where Jev in the cloud or open-weight Laya locally gates architecture choices, package vetting, shell commands, and completion checks.
Jev Tools & CLIs#community#skills#coding-agent
CommunityAkashPriyadarshii/jev-superpowersHTML
Jev Router
17GitHub stars
A Pi plugin that has Jev pick one model and one reasoning-effort level from a configured list at the start of a session, then keeps both pinned for the rest of it.
Jev Tools & CLIs#community#javascript#routing
Communitymejiasd3v/pi-jev-routerJavaScript
TypeSafe for Rust
15GitHub stars
A Rust client for the System One API with typed Noul, Choice, and Score results, async and blocking transports, batched questions over one state, and inspectable retry and error details.
Jev Repos & SDKs#community#rust#sdk
CommunityTwister915/typesafe-aiRust
jev-router
14GitHub stars
An OpenAI-compatible LiteLLM proxy where clients send one model id and Jev picks which configured model serves each request, with capability filtering and a cheapest-eligible fallback.
Jev Tools & CLIs#community#python#routing
Communityprismhq/jev-routerPython
jev-search-rerank-eval
11GitHub stars
A graded relevance evaluation of Jev as a reranker: 9,831 labelled pairs from 164 queries over a 33,047-item skills catalog, comparing Jev score reranks with BM25, bge-m3, and rank fusion.
Jev Practices & Patterns#community#python#search
Communityzhuyansen/jev-search-rerank-evalPython
every
8GitHub stars
A semantic code search CLI that asks one yes/no Jev question per function and ranks the returned probabilities, screening a whole codebase for a pattern in seconds for cents.
Jev Tools & CLIs#community#python#cli
Communitysufianetaouil/everyPython
Does Jev know when it doesn't know?
6GitHub stars
An independent calibration study of Jev over three public benchmarks and 900 rule-generated support tickets, publishing every raw Gateway response and the quantization limits of returned probabilities.
Jev Practices & Patterns#community#python#calibration
Communityscienthoon/jev-ood-calibrationPython
TypeSafe Rust SDK
7GitHub stars
An independent Rust client for the System One API targeting parity with the official Python and JavaScript SDKs at 0.6.0, with async and blocking clients, model discovery, and configurable retries.
Jev Repos & SDKs#community#rust#sdk
Communitygilljon/typesafe-ai-rsRust
jevkit
5GitHub stars
A Rust CLI that sends terse YAML or JSON question sets to Jev, validates them offline with 13 lint rules before any billed call, and prints parsed answers as JSON.
Jev Tools & CLIs#community#rust#cli
Communityariel-frischer/jevkitRust
Jev vs LLM: a phishing decision benchmark with a calibration audit
9GitHub stars
A public benchmark comparing Jev with Claude Haiku 4.5 on whether an email agent should click a link, over 2,000 PhishNChips emails, with calibration, latency, cost, and five signal questions.
Jev Practices & Patterns#community#python#security
Communityanisselbd/jev-phishing-benchPython
pytest-jev
7GitHub stars
A pytest plugin for semantic assertions: jev.expect sends many holds and lacks claims about one text to Jev in a single request and fails visibly when a probability is uncertain.
Jev Repos & SDKs#community#python#evaluation
Communityallebee/pytest-jevPython
jev-scout
5GitHub stars
A Rust CLI and stdio MCP server that grounds repository and crate discovery in live GitHub and crates.io metadata, then lets Jev score candidates so only verified, installable packages are returned.
Jev Tools & CLIs#community#rust#cli
CommunityAkashPriyadarshii/jev-scoutRust
jevclient
2GitHub stars
An async Python client for Jev with typed Noul, Choice, and Score helpers: questions batch into one request, and callers get probabilities, choices, and weighted scores instead of text to parse.
Jev Repos & SDKs#community#python#sdk
CommunityAboveColin/jevclientPython
ruby_llm-typesafe
18GitHub stars
A RubyLLM 2 provider that adds Jev through structured output: build Noul, Choice, and Score questions with a schema builder, pass them to chat.with_schema, and read typed answers from response.parsed.
Jev Repos & SDKs#community#ruby#sdk
Communitykieranklaassen/ruby_llm-typesafeRuby
typesafe-ai-rails
3GitHub stars
A community Rails integration built on the typesafe-sdk Ruby gem that adds Rails configuration, persisted usage and cost telemetry, and persistence-backed confidence policies for Choice and Score answers.
Jev Repos & SDKs#community#ruby#sdk
CommunityGenieRobot/typesafe-ai-railsRuby
typesafe-rs
1GitHub stars
A community Rust client for Jev's System One API whose environment variables, defaults, retries, identification headers, and error kinds match the official Python and TypeScript SDKs.
Jev Repos & SDKs#community#rust#sdk
CommunityAbdelStark/typesafe-rsRust
Bicameral
8GitHub stars
A hybrid coding harness for Pi where any LLM writes the code while Jev returns typed probabilities that deterministic policy code turns into allow, confirm, block, warn, or steer.
Jev Tools & CLIs#community#typescript#agents
CommunityAbdelStark/bicameralTypeScript
Jevonian
27GitHub stars
An experimental local proxy for coding agents that sends jevonian/auto turns to Jev to pick a model and thinking level after deterministic compatibility and quota filters, while explicit routes skip Jev.
Jev Tools & CLIs#community#typescript#routing
Communityxinyao27/jevonianGo
Skillbox
272GitHub stars
A self-hosted, versioned skills library for AI agents with HTTP MCP, scoped client keys, and opt-in Jev recommendations that rank skills for a task using your own OpenRouter, TypeSafe, or Vercel key.
Jev Tools & CLIs#community#typescript#mcp
Communitykitze/skillboxTypeScript
eve
5.6kGitHub stars
A filesystem-first framework for durable AI agents whose auto model router defaults to Jev through Vercel AI Gateway and whose evaluate helper asks typed Choice, Score, and Boolean questions inside tools.
Jev Repos & SDKs#community#typescript#agents
Communityvercel/eveTypeScript
JevRouter
474GitHub stars
A router that turns models, subagents, skills, MCP tools, CLIs, and plugins into one candidate set Jev answers with a single typed Choice, while the router code owns availability, permissions, and confirmation.
Jev Tools & CLIs#community#typescript#routing
CommunityBillionsBobby/JevRouterTypeScript
jev-secret-detection
2GitHub stars
A measurement harness that sends each file snippet to Jev as one Noul question asking whether the content contains a usable secret credential, then scores the returned probability against the expected label.
Jev Practices & Patterns#community#python#security
Communityteyhouse/jev-secret-detectionPython
commit-miner
39GitHub stars
A Rust CLI that classifies Git commit diffs and messages with Jev into bug fixes, security fixes with CWEs, and change types, then writes HTML or CSV reports from saved scans.
Jev Tools & CLIs#community#rust#cli
Communitydevanshbatham/commit-minerRust
awesome-jev
2.4kGitHub stars
A curated community list of public projects and practices built on Jev, grouped by direct Jev application domain; the October 2026 crawl lists 481 repositories plus hundreds of practice links, interviews, and discussions.
Jev Guides & Articles#community#awesome-list#documentation
Communityyibie/awesome-jevPython
Awesome Jev by TypeSafe
1GitHub stars
An evidence-backed community collection of Jev use cases, patterns, prompts, and starter code, with quick facts sourced to TypeSafe docs and runnable Python and TypeScript quickstart examples.
Jev Guides & Articles#community#awesome-list#tutorial
CommunityAnil-matcha/awesome-jev-by-typesafePython
Simple Jev Project
608GitHub stars
A local server and Python package that runs open models with Hugging Face Transformers or PyTorch and returns Choice, Score, and Noul answers read from next-token logits instead of generated JSON.
Jev Repos & SDKs#community#python#open-models
Communityfeatherless-ai/simple-jevPython
Grok Bot Jev Router
112GitHub stars
A reference router and skill that put Jev in front of Grok Bot so each request is classified before expensive research, browser, retry, or subagent work, returning actions such as reuse_cache or ask_human.
Jev Tools & CLIs#community#python#routing
CommunityBodila51/grok-bot-jevPython
Open Alternative to Jev
68GitHub stars
An Apache-licensed Python library that reads option-token probabilities from open-weight models through Transformers or vLLM, giving Jev-style typed decisions in one forward pass without an HTTP server.
Jev Repos & SDKs#community#python#open-models
Communityikermoel/open-alternative-jevPython
Canny
123GitHub stars
A warden for Claude Code and Codex CLI that keeps an append-only ledger of what an agent did, refuses a done claim when no check passed after the last edit, and uses optional Jev Noul judgments.
Jev Tools & CLIs#community#typescript#claude-code
Communityqkal/CannyTypeScript
jgrep
138GitHub stars
A grep-style CLI where the pattern is a plain-English description: each line becomes one Jev Noul question, judged concurrently with matches printed in input order, working on tail -f as well as files.
Jev Tools & CLIs#community#python#cli
Communitykeltokhy/jgrepPython
jsort
28GitHub stars
A sort CLI where the key is a plain-English description: Jev compares texts in pairs, jsort fits a Bradley-Terry scale to the answers, and prints each score with a standard error.
Jev Tools & CLIs#community#python#cli
Communitykeltokhy/jsortPython

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.