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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 2881–2928 of 3904 resources

gpt-vs-jev
1GitHub stars
A small Next.js demo that sends the same input to GPT and Jev side by side, showing generative text next to three fixed Noul probabilities.
Jev Demos & Experiments#community#jevbest#catalog-import
CommunityTanayPadar/gpt-vs-jevTypeScript
jevusecases
2GitHub stars
A directory of projects actually shipped with Jev, filtered by what each one replaces, whether it was benchmarked, and whether there is code to copy.
Jev Guides & Articles#community#jevbest#catalog-import
CommunitytheSekyi/jevusecasesTypeScript
jev-routing-experiment
2GitHub stars
Runs Jev as an LLM router over two public benchmarks, with a no-Jev ablation and RouterArena's own scorer so the numbers sit next to the public leaderboard.
Jev Practices & Patterns#community#jevbest#catalog-import
CommunityTokenTrim/jev-routing-experimentPython
harden-jev-decides
1GitHub stars
A decision board that sends one System One request describing eleven stream ideas, then lets code gate and weight Jev's answers into a single pick for what to build next.
Jev Demos & Experiments#community#jevbest#catalog-import
Communitytylerjharden/harden-jev-decidesTypeScript
typesafe_sdk_ex
1GitHub stars
An unofficial Elixir SDK for TypeSafe's System One endpoint, built on Req and Finch, with per-call retry policies, a shared connection pool and status-mapped errors.
Jev Repos & SDKs#community#jevbest#catalog-import
Communityvinnie357/typesafe_sdk_exElixir
jev-gomoku
3GitHub stars
A gomoku lab that runs nine 15x15 games at once with two Jev players, holding the rules fixed while you vary how much tactical detail reaches the model.
Jev Demos & Experiments#community#jevbest#catalog-import
CommunityXieChengYuan/jev-gomokuJavaScript
dsh-jev-verify
1GitHub stars
A DeepSeek Harness plugin that exposes System One decisions as agent tools and adds an opt-in auto-guard, with a labeled benchmark it re-runs against the live API.
Jev Agents & MCP#community#jevbest#catalog-import
Communityxienda/dsh-jev-verifyJavaScript
decido
1GitHub stars
A Python layer over a small decision-provider contract that adds validated distributions, batching, budgets, ranking and exportable records, with Jev as the first provider.
Jev Repos & SDKs#community#jevbest#catalog-import
Communityyairshy/decidoPython
tiab-review-plugin
2GitHub stars
A Chrome extension that runs title and abstract screening for systematic reviews inside a shared Google Sheets project, with Jev offered beside Gemini and OpenRouter as the judging model.
Jev Tools & CLIs#community#jevbest#catalog-import
Communityyoukiti/tiab-review-pluginTypeScript
pi-jev-helm
1GitHub stars
A Pi extension that sends each new unit of work to a Jev client as a paid classification request and routes it to one of four configured Pi models, failing open to your baseline.
Jev Agents & MCP#community#jevbest#catalog-import
CommunityZ761293629/pi-jev-helmTypeScript
openjev-experiments
1GitHub stars
A single self-contained Python script around AlexWortega/openjev, a Qwen3.5-4B cross-encoder that answers contradiction, entailment or neutral, exposing pair classification, multiple-choice rerank, a library API and a CLI.
Jev Practices & Patterns#community#jevbest#catalog-import
Communityzefir1990/openjev-experimentsPython
typesafe-go
4GitHub stars
An unofficial, dependency-free Go client for the TypeSafe v1 API: System One calls built from Noul, Choice and Score questions, per-request model overrides, typed answers with a request ID, and retries that honor Retry-After.
Jev Repos & SDKs#community#jevbest#catalog-import
Communityzhirschtritt/typesafe-goGo
padflow-jev-evals
1GitHub stars
A public benchmark for the three typed decisions a land-development SaaS actually makes: JSON schemas, anonymized seed rows, and a script that scores any OpenAI-compatible model on accuracy, calibration, cost and latency.
Jev Practices & Patterns#community#jevbest#catalog-import
Communityzsavage8/padflow-jev-evalsPython
jev-browser-skill
2GitHub stars
Three dependency-free files that put Jev in a browser agent's hot path: code builds the choices from a table of visible controls, Jev picks an operation and target in one forward pass, and the code executes the pick.
Jev Demos & Experiments#community#jevbest#catalog-import
Communityzurfyx/jev-browser-skillJavaScript
jev-carryforward
2GitHub stars
An MCP server with two tools for agent memory: record writes facts into a per-project ledger as they happen, and recall scores each one against the task you are starting and hands back only what matters.
Jev Practices & Patterns#community#awesomejev#catalog-import
CommunityDharundp6/jev-carryforwardTypeScript
modelsystem
1GitHub stars
The public contribution surface for modelsystem.one, a curated catalog of System One decision models: systems returning typed choice, score or boolean answers with calibrated probabilities instead of chat text. The site code is private.
Jev Practices & Patterns#community#awesomejev#catalog-import
Communityfabricioctelles/modelsystem
typesafe-vs-deepseek
1GitHub stars
A Vercel-hosted comparison of TypeSafe (Jev) against DeepSeek-flash on speed, tokens, cost and accuracy, backed by per-task Python pipelines, fixture generators and a report script. Eighteen commits, nine issues still open.
Jev Practices & Patterns#community#awesomejev#catalog-import
Communitymarkfive-proto/typesafe-vs-deepseekPython
jev-organize
2GitHub stars
A Node CLI that reads a folder of Word, Excel, PowerPoint, PDF, email, CSV, HTML, code and text files, classifies each with Jev on OpenRouter, and writes a catalog, an INDEX.md and an offline report. Originals are never moved.
Jev Agents & MCP#community#awesomejev#catalog-import
Communitynexibeo/jev-organizeJavaScript
Cerebellum-2B
1GitHub stars
An open Apache-2.0 2B non-autoregressive decision model for agent action routing on a Qwen3.5-2B backbone: one forward pass over a candidate set with a pointer head and an escalation head, shipped as BF16, FP8 and INT8 weights.
Jev Demos & Experiments#community#awesomejev#catalog-import
Communitymkeco/Cerebellum-2BPython
jevplayground
1GitHub stars
Single-file browser testbed that sends state plus boolean, choice and score questions to Jev through the Vercel AI Gateway and shows answers, probabilities, latency, token counts and estimated cost for every run.
Jev Demos & Experiments#community#awesomejev#catalog-import
Communityterryds/jevplaygroundHTML
instruct-jev
1GitHub stars
Instruction corpus compiled from TypeSafe's public Jev documentation: 119 rows split across the Choice, Noul and Score primitives, with the captured source files, a standard-library Python builder and a published HuggingFace dataset.
Jev Agents & MCP#community#awesomejev#catalog-import
Communityctaxnagomi/instruct-jevPython
jev-model-router
2GitHub stars
Plugin for Claude Code, the Claude desktop app and Codex that has Jev read the task, then ranks live OpenRouter models by benchmark quality, price, speed and reasoning effort, returning a pick plus cheaper and faster alternatives with the exact command to switch.
Jev Agents & MCP#community#awesomejev#catalog-import
CommunityMandrilsquad1441/jev-model-routerTypeScript
jev-labs
2GitHub stars
Consensus kernel that wraps Jev as a probabilistic oracle: five paraphrased questions, a stability gate set from the measured noise floor and a 3-of-5 quorum, with TLA+ specs, an AsyncAPI contract and Rust tests generated and gated from them.
Jev Practices & Patterns#community#awesomejev#catalog-import
Communitycopyleftdev/jev-labsPython
jev-firewall
2GitHub stars
PreToolUse hook for Claude Code and Codex that puts a shell-aware rules engine and Jev in front of every tool call, returning allow, ask or block per command and logging the reason and latency behind each decision.
Jev Agents & MCP#community#awesomejev#catalog-import
CommunityKoushik890/jev-firewallTypeScript
magic-jev
2GitHub stars
Chrome extension that puts a Magic 8 Ball on GitHub pull requests: nine signals from the GitHub API go to a small server, Jev picks one of four verdicts, and the ball answers with a phrase plus its reasoning. It never approves, comments or reads code.
Jev Agents & MCP#community#awesomejev#catalog-import
Communityacharyaanusha/magic-jevTypeScript
jev-lens.nvim
1GitHub stars
Neovim popup that reads the verdict jev-lens writes after a Claude Code edit and tells you whether to open a diff, which files matter and why, with a strip-debris action, lazydiff on a key, and no API calls of its own.
Jev Integrations & Adapters#community#awesomejev#catalog-import
CommunityrashedInt32/jev-lens.nvimLua
typesafe-sdk-go
1GitHub stars
Community Go client for the TypeSafe API: context-aware SystemOne calls, Choice, Noul and Score constructors, scoped functional options, typed errors carrying RFC 6901 field paths, and standard-library-only runtime code. Requires Go 1.24.
Jev Repos & SDKs#community#awesomejev#catalog-import
Communityunimtx/typesafe-sdk-goGo
openpoke-meets-jev
1GitHub stars
Fork of OpenPoke that replaces three yes/no LLM calls with batched Jev questions: important-email screening, a tool-call guardrail for the execution agents, and a relevance re-check on search results, with the old classifier left as the fallback.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community0xShin0221/openpoke-meets-jevPython
jevcode
1GitHub stars
Chinese-first Astro documentation site for Jev, covering the Choice, Noul and Score primitives plus intent routing, confidence routing, composite scoring and fan-out patterns, with an eight-language build and a cron pipeline where Jev gates each release.
Jev Demos & Experiments#community#awesomejev#catalog-import
Communitymiounet11/jevcodeTypeScript
jevtrafficsim
1GitHub stars
Chicago traffic simulator where Jev sets citywide signal policy and two deterministic baselines replay the identical scenario: one car crosses the city while Fixed and Adaptive run headlessly against the same spawn list, seed and incident script.
Jev Demos & Experiments#community#awesomejev#catalog-import
Communityskcache/jevtrafficsimTypeScript
what-is-jev
1GitHub stars
Independent research repository on Jev: sourced findings that separate verified claims from vendor marketing repeated by others, a rubric-scored catalog of public Jev repositories, and recurring design patterns with evidence.
Jev Practices & Patterns#community#awesomejev#catalog-import
Communityg0runmezadam/what-is-jevPython
jev-practice-speed
1GitHub stars
WebGL demo of the card game Speed against a Jev-driven CPU, built to make decision latency and accuracy visible: every candidate move checked as a noul in one parallel request, a mechanical rule validator as referee, and p50/p95 latency panels.
Jev Demos & Experiments#community#awesomejev#catalog-import
Communitytubone24/jev-practice-speedJavaScript
jev-harness-router
4GitHub stars
TypeScript router that spends one Jev call deciding how an agent turn should run — model tier, effort budget, which tools are on offer and which skill applies — then your own harness runs the turn on whatever provider it already talks to.
Jev Repos & SDKs#community#awesomejev#catalog-import
CommunityJoacoMarc/jev-harness-routerTypeScript
jevskill
3GitHub stars
Agent Skill that sends large tool output and CI logs to Jev and hands your expensive model only the few lines that matter, shipped with a stdlib-only caller, a doctor command, and a plan mode that keeps open-ended work on your LLM.
Jev Agents & MCP#community#awesomejev#catalog-import
Communitylazniak/jevskillPython
typesafe-sdk-ruby
1GitHub stars
Unofficial Ruby client for TypeSafe AI: typed noul, choice and score answers, retries with jitter and Retry-After handling, per-call timeouts, a structured error hierarchy, and request-shape validation before anything goes over the wire.
Jev Repos & SDKs#community#awesomejev#catalog-import
Communityafurm/typesafe-sdk-rubyRuby
jev-benchmark
1GitHub stars
Runnable benchmark putting Jev, jev-preview and Claude Sonnet 5 through one real agent task — classifying a tool call as readonly, destructive, privileged or exfiltration — on the same 60 labelled cases, with raw per-call results committed.
Jev Practices & Patterns#community#awesomejev#catalog-import
Communitythemsquared/jev-benchmarkPython
typesafe-sdk-go
1GitHub stars
Go client for the TypeSafe API with typed question and answer types, per-request model and timeout overrides, request-body passthrough for fields the SDK does not model, and slog diagnostics that exclude bodies and credentials.
Jev Repos & SDKs#community#awesomejev#catalog-import
Communitydwisiswant0/typesafe-sdk-goGo
jev-routing
1GitHub stars
Archived Go proxy that sat between a coding-agent CLI and the upstream API to rewrite tool schemas and history with Jev, kept for the negative result: tool steering cut tokens on one model and added 37% and 51% on two others.
Jev Agents & MCP#community#awesomejev#catalog-import
Communitynekowasabi/jev-routingGo
typesafe-showcase
1GitHub stars
Six browser demos of Jev's three primitives, each running the same judgment past Gemini or Claude for a side-by-side, with visitors pasting their own keys into localStorage instead of sharing a server-side key.
Jev Demos & Experiments#community#awesomejev#catalog-import
CommunityAshadeepa/typesafe-showcaseTypeScript
jev-go
1GitHub stars
Small Go SDK for the Jev API: three question types with matching typed answers, functional client options, and a single APIError type carrying the status code, headers and raw body.
Jev Repos & SDKs#community#awesomejev#catalog-import
Communitykyledickey/jev-goGo
codex-jev-preflight
2GitHub stars
A Codex UserPromptSubmit hook that asks Jev for task_type, complexity, risk and execution_mode before a task starts and injects the result as advisory context, failing open on timeouts, quota errors and invalid responses.
Jev Agents & MCP#community#awesomejev#catalog-import
Communitywellkilo/codex-jev-preflightPython
hunch
1GitHub stars
Browser agent that takes one Jev decision per action on top of agent-browser and only calls an LLM when confidence drops, escalating instead of guessing, with values, origins and irreversible clicks all guarded in code.
Jev Demos & Experiments#community#awesomejev#catalog-import
CommunityHAR5HA-7663/hunchPython
TypeSafe.Jev
1GitHub stars
C# client for Jev, TypeSafe AI's System One model. Typed Noul, Choice and Score questions go out with one state in a single round trip and come back with a value, a probability distribution and a confidence number. Choice questions can be built from an enum, so the compiler finds the switch branch you forgot.
Jev Repos & SDKs#community#awesomejev#catalog-import
CommunityRavenValentin/TypeSafe.JevC#
jev
5GitHub stars
Go client for the TypeSafe System One API and the Jev model. Send one state with named Noul, Choice and Score questions and read back a typed answer, a probability for every option and a confidence. Ships a token-bucket rate limiter, a JavaScript-SDK-style retry policy and a full set of error sentinels.
Jev Repos & SDKs#community#awesomejev#catalog-import
Communitykataras/jevGo
system-one-playground
1GitHub stars
A Go repository around the TypeSafe System One API that also ships a released CLI and a VS Code extension. SysOneScript scripts run offline, semlint inspects source and proposes checks, Studio is the editor front end, and the typesafe subpackage talks to Jev from your own module.
Jev Repos & SDKs#community#awesomejev#catalog-import
CommunityDonaldMurillo/system-one-playgroundGo
system-one-security-triage
1GitHub stars
A reproducible 100-case demo that runs TypeSafe's Jev decision model against OpenAI's Terra and Anthropic's Opus on identical synthetic security evidence, then renders the recorded JSON to a static dashboard with no credentials in the browser.
Jev Practices & Patterns#community#awesomejev#catalog-import
CommunityRobertzu43/system-one-security-triageTypeScript
tinystruct-typesafe-sdk
2GitHub stars
A Java and Maven framework that lets natural language route to existing tinystruct @Action methods: Jev picks the action and its arguments as a probability distribution over options you supply, and the dispatcher then runs, holds for confirmation, or refuses.
Jev Repos & SDKs#community#awesomejev#catalog-import
Communitytinystruct/tinystruct-typesafe-sdkJava
jev-hooks
1GitHub stars
A TypeScript library that treats typed semantic judgments as React hooks or plain server programs: pass one judgment's result into the next and the runtime works out the dependency, waits for fresh answers and batches compatible questions.
Jev Demos & Experiments#community#awesomejev#catalog-import
Communitymicrochipgnu/jev-hooksTypeScript

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.