All Jev resources
This is the full index of everything Jev: 2231 entries for TypeSafe AI's flagship System One model, from official documentation, SDKs, and cookbooks to community-built clients, MCP servers, agent tools, and write-ups. Every entry is tagged by category, format, and topic, and sorted newest first.
Filter by category or tag, or search titles, descriptions, authors, and repos. Open any card for its detail page — most entries carry a verified deep dive with highlights, caveats, and a quickstart snippet.
- Entries
- 2231
- Categories
- 11
- Official
- 93
- Community
- 2138
- Source sites
- 148
- Deep dives
- 2231
Last updated . Entries are added as they appear and re-checked when they are touched.
Browse Jev by category
11 ways into the ecosystem. Each category page leads with its own shortlist of starting points.
- Repos & SDKs202Client libraries, adapters, and source code you can build on with Jev, from the official Python and TypeScript SDKs to community ports in Go, .NET, and PHP.
- Integrations & Adapters145Framework, platform, gateway, and database integrations that put Jev inside the stack you already run, from LangChain and Pydantic AI to Postgres and Home Assistant.
- Agents & MCP302Agent runtimes, coding-agent gates and routers, MCP servers, and skill or context tooling that hand an agent Jev's typed decisions.
- Tools & CLIs447Standalone Jev CLIs, desktop apps, playgrounds, and utilities you run directly, from shell history and semantic search to dashboards and meters.
- Cookbooks91Official, runnable Jev recipes that show what decision models are good at, each with its own datasets, latencies, and numbers.
- Demos & Experiments363Playable demos, games, simulators, and experiments that put Jev in the loop, from Mario and drones to moderation firehoses and trading bots.
- Practices & Patterns248How to design Jev states, questions, and confidence gates the right way, from the official patterns to the failure modes worth designing around.
- Guides & Articles224Documentation, write-ups, and community hubs for learning Jev, from the canonical docs to independent tutorials and reviews.
- Benchmarks & Evaluations55Benchmarks, calibration studies, independent evaluations, and observability write-ups that measure how Jev actually behaves.
- Models & Reimplementations99Open reimplementations of Jev, retrained heads on small models, and inference-time tricks that reproduce the System One shape with other weights.
- Media & Talks55Videos, talks, podcasts, and news coverage about building with Jev.
Browse Jev by use case or industry
The same directory, sliced by what you are building and who you are building it for.
All 2231 Jev resources
Search the full directory, or filter by category and tag.
Showing 625–672 of 736 resources
0GitHub stars
A Python workspace plus Manifest V3 Chrome extension that turns a rough opinion into a draft in your own voice, with an OpenAI clarity pass and Jev as the style judge, and per-phrase accept or dismiss.
Jev Tools & CLIs#community#jevbest#catalog-import
Community
jxucoder/mimicryPython
jxucoder/mimicryPython0GitHub stars
A Pi extension that keeps your existing coding model as the only agent and adds Jev as a coprocessor for search reranking, a pre-edit semantic gate, and a diff review against the task's starting commit.
Jev Agents & MCP#community#jevbest#catalog-import
Community
KamilPostrozny/pi-jev-codeTypeScript
KamilPostrozny/pi-jev-codeTypeScript0GitHub stars
A local Python browser automation UI that turns a URL and a plain-language goal into bounded actions, with Jev picking the next operation from observed candidates and a separate text model used only to fill fields.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
KesavanKing/jev-browserPython
KesavanKing/jev-browserPython2GitHub stars
An MCP stdio proxy in front of the official Playwright MCP server that triages page state, masks prompt injection, trims oversized page dumps by goal and risk-gates actions, exposing the same tools and schemas.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
krw82/jev-playwright-mcpTypeScript
krw82/jev-playwright-mcpTypeScript1GitHub stars
A Rust client for typed decision models across TypeSafe Jev, Cloudflare Clef, Liquid, Vercel AI Gateway and OpenRouter, with noul, choice and score builders, typed label enums, and a scripted fake for tests.
Jev Repos & SDKs#community#jevbest#catalog-import
Community
kunobi-ninja/kunobi-jevRust
kunobi-ninja/kunobi-jevRust0GitHub stars
LabDados FGV Direito SP experiment that annotates 12 variables across 120 TJSP civil sentences and compares jev-latest with Gemini 3.8 Flash and GPT-5.6 Luna on accuracy, median latency and cost per thousand sentences.
Jev Practices & Patterns#community#jevbest#catalog-import
0GitHub stars
A Cloudflare Worker that races you against Jev over 25 spam-classification rounds: a countdown reveals a message, your tap and Jev's Noul question fire on the same tick, and the results screen compares speed and accuracy.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
lambertsj/beatjevJavaScript
lambertsj/beatjevJavaScript3GitHub stars
Classifies an artist's discography by theme, mood and lyrical complexity with Jev, then renders it as an Ink terminal dashboard. MusicBrainz supplies the discography, lrclib.net the lyrics, one batched call per track.
Jev Tools & CLIs#community#jevbest#catalog-import
Community
lirantal/discoprintJavaScript
lirantal/discoprintJavaScript1GitHub stars
A Streamlit Tetris where the engine enumerates every legal placement, Jev picks one typed placement ID, and Python verifies rotation, column and exact occupied cells before the piece is allowed to lock.
Jev Demos & Experiments#community#jevbest#catalog-import
0GitHub stars
A browser MCP server where Jev picks the next page action from locally ranked candidates in roughly 300 ms without LLM tokens, deterministic state diffs verify the step, and the driving agent steps in only on escalation.
Jev Demos & Experiments#community#jevbest#catalog-import
0GitHub stars
A 3D chess board where Jev plays: AI versus AI by default, or take either side yourself, with several difficulty levels. The repository README is three lines long and documents nothing beyond that.
Jev Demos & Experiments#community#jevbest#catalog-import
0GitHub stars
A Go CLI that asks Jev to assess a task once, then picks a model, harness or API locally instead of launching it. Policies weigh cost against a quality floor, and every decision can be recorded and replayed.
Jev Agents & MCP#community#jevbest#catalog-import
Community
marcus/frostGo
marcus/frostGo2GitHub stars
An unofficial Elixir client for TypeSafe's System One API. Noul, Choice and Score questions go out in one request and come back as structs with probabilities, and thresholds and policy stay in your code.
Jev Repos & SDKs#community#jevbest#catalog-import
Community
mattneel/typesafeElixir
mattneel/typesafeElixir1GitHub stars
An unofficial Zig client for TypeSafe's System One API where answer types come from your questions at compile time: Choice returns your own enum, Score returns a fixed-size probability array.
Jev Repos & SDKs#community#jevbest#catalog-import
Communitymattneel/typesafe.zigZig
mattneel/typesafe.zigZig0GitHub stars
A small Node.js TypeScript CLI for trying Jev on synthetic support text: one urgency question, three questions in a single request, or a latency comparison. No web server and no UI.
Jev Practices & Patterns#community#jevbest#catalog-import
Community
Menny1337/jev-labTypeScript
Menny1337/jev-labTypeScript2GitHub stars
A Magic 8 Ball that picks with Jev instead of at random. Hold, shake, release, and Jev chooses from the twenty classic answers and returns a probability for each one, shown under the ball.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
mikecann/magic-jev-ballTypeScript
mikecann/magic-jev-ballTypeScript0GitHub stars
A CLI and GitHub Action that turns a Git change into an explainable risk score, required checks and reviewer groups, where deterministic rules and Jev's semantic judgements both trace back to a named rule.
Jev Agents & MCP#community#jevbest#catalog-import
Community
moezubair/check-riskTypeScript
moezubair/check-riskTypeScript0GitHub stars
A Japanese-language repository that continuously researches TypeSafe's Jev and System One models and organises the findings as Markdown slides, a presentation script and a standalone article.
Jev Practices & Patterns#community#jevbest#catalog-import
Community
myokoym/misereru-slide-jevJavaScript
myokoym/misereru-slide-jevJavaScript0GitHub stars
macOS demo that runs one utterance through both TypeSafe jev and an LLM judge, accumulates each verdict as a separate affectus emotional state, and shows the split as Plutchik petals, per-axis deltas and two replies generated from a single fixed persona.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
n-yokomachi/jev-devTypeScript
n-yokomachi/jev-devTypeScript0GitHub stars
Vite app that turns a small CSV into a presentation-ready dashboard by profiling every column, choosing the charts that fit the data and writing a headline per chart, with an optional Jev pass that reads each row for what the columns cannot answer on their own. The built-in demos run entirely in the browser.
Jev Demos & Experiments#community#jevbest#catalog-import
0GitHub stars
A repository whose README is a title and one sentence: SMB checkout fraud disposition with TypeSafe Jev. There is no install step, no request schema, no decision labels and no threshold list in the documentation, so the stated use case is the only claim available.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
ndolinschi/cartshieldTypeScript
ndolinschi/cartshieldTypeScript0GitHub stars
Paste a trace of an agent step, get one of four dispositions back: ok, retry, escalate or stop. Aimed at agent builders putting a supervision step around an agent loop, with the judging powered by TypeSafe Jev and a two-command setup.
Jev Demos & Experiments#community#jevbest#catalog-import
Communityndolinschi/harnessjudgeTypeScript
ndolinschi/harnessjudgeTypeScript0GitHub stars
HireSignal is a resume first-pass scoring demo running on TypeSafe Jev. The whole README is a single sentence, so the interface, the scoring rubric, the question shape and the setup steps are all undocumented.
Jev Demos & Experiments#community#jevbest#catalog-import
Communityndolinschi/hiresignalTypeScript
ndolinschi/hiresignalTypeScript0GitHub stars
JevPlay is a playground for TypeSafe Jev: a freeform state block plus a builder for custom Choice, Score and Noul questions, showing live probability distributions as you write them. Setup is npm i and npm run dev.
Jev Demos & Experiments#community#jevbest#catalog-import
Communityndolinschi/jevplayTypeScript
ndolinschi/jevplayTypeScript0GitHub stars
LaneBreak is a support ticket triage demo covering priority assignment plus routing, built on TypeSafe Jev. The README is a title, one sentence, and the standard npm i and npm run dev pair.
Jev Demos & Experiments#community#jevbest#catalog-import
Communityndolinschi/lanebreakTypeScript
ndolinschi/lanebreakTypeScript0GitHub stars
McpMatch takes a free-text user goal and matches it against a catalog of MCP servers or capabilities using TypeSafe Jev, with a two-stage path for large catalogs. Runs with npm i and npm run dev.
Jev Demos & Experiments#community#jevbest#catalog-import
Communityndolinschi/mcpmatchTypeScript
ndolinschi/mcpmatchTypeScript1GitHub stars
PulseLane models clinic triage decisions through TypeSafe Jev on System One. An optional TYPESAFE_API_KEY in .env.local switches it from bundled demo heuristics to real model calls; without a key the heuristics return the same answer shape so the UI still runs.
Jev Demos & Experiments#community#jevbest#catalog-import
Communityndolinschi/pulselaneTypeScript
ndolinschi/pulselaneTypeScript0GitHub stars
SpendBrake turns a budget plus a plan into one of three calls — continue, downgrade_model or stop — and renders the cost against value as a dashboard, with the decision made by TypeSafe Jev.
Jev Demos & Experiments#community#jevbest#catalog-import
Communityndolinschi/spendbrakeTypeScript
ndolinschi/spendbrakeTypeScript0GitHub stars
SwarmRouter picks which agent or skill should handle a task and returns a confidence with the pick, drawn as a visual swarm map, with the choice made by TypeSafe Jev. Five handler types are named in the README.
Jev Demos & Experiments#community#jevbest#catalog-import
Communityndolinschi/swarmrouterTypeScript
ndolinschi/swarmrouterTypeScript0GitHub stars
TrustGate is described in one line as an indie media trust and safety gate powered by TypeSafe Jev. The README carries no further detail: no commands, no inputs, no verdict set, and no setup instructions.
Jev Demos & Experiments#community#jevbest#catalog-import
Communityndolinschi/trustgateTypeScript
ndolinschi/trustgateTypeScript0GitHub stars
Sloppy Jev's is a Manifest V3 Chrome extension that blurs AI-generated prose and ads, classifying extracted page text through jev-latest on the TypeSafe API. Plain JavaScript and CSS, no build step, MIT licensed, loaded unpacked.
Jev Demos & Experiments#community#jevbest#catalog-import
0GitHub stars
A fork of the SHADE-Arena public split that evaluates TypeSafe Jev as a monitor for covert agent sabotage, against Gemini 2.5 Flash and Pro. Thirteen hand-built transcripts across three tasks, 353 tool calls, and a full LaTeX report.
Jev Practices & Patterns#community#jevbest#catalog-import
0GitHub stars
The repository README is the unmodified create-next-app template. It documents the standard dev server flow, editing app/page.tsx, next/font loading Geist and deploying to Vercel, and contains no mention of Jev, TypeSafe or any decision primitive.
Jev Demos & Experiments#community#jevbest#catalog-import
0GitHub stars
A Python pipeline that captures the PCSX2 window, injects virtual DualShock 2 input and draws a broadcast-style telemetry HUD, with TypeSafe Jev System One as one of three swappable decision engines behind a BaseAgent interface.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
opaielsheikh/ps2-ai-agentPython
opaielsheikh/ps2-ai-agentPython0GitHub stars
A browser brick breaker on Next.js 16 and React 19 where you can hand the paddle to a Jev pilot: the server computes the ball's path and the model picks one of 16 zones. The in-game interface is in French.
Jev Demos & Experiments#community#jevbest#catalog-import
1GitHub stars
A local React and Express editor that scores an X draft across six dimensions, from hook strength to a slop penalty, by asking Jev several narrow rubric questions in one structured call, with a deterministic fallback when no key is set.
Jev Tools & CLIs#community#jevbest#catalog-import
Community
pekth/draftpulseTypeScript
pekth/draftpulseTypeScript3GitHub stars
A Grok skill where you write the questions and environment state, Jev returns typed probabilities, and the script mixes them with your priors into posteriors before you act. Ships a nine-case benchmark you can run without a key.
Jev Agents & MCP#community#jevbest#catalog-import
0GitHub stars
A Three.js infinite-grid Tron arena shooter where Jev drives three systems: enemy combat choices and threat scores, a director picking encounters and pacing, and a P-key autopilot running 5-10 decisions per second. Ships with a local engine.
Jev Demos & Experiments#community#jevbest#catalog-import
0GitHub stars
A GitHub Action that turns a labelled issue into a pull request, with a four-part gate before a human sees it: path and test guards, your own check commands, a read-only Claude reviewer, and Jev checking each finding plus whether the change does what the issue asked.
Jev Agents & MCP#community#jevbest#catalog-import
Community
Ripwords/agent-gate-loopTypeScript
Ripwords/agent-gate-loopTypeScript6GitHub stars
A Rust CLI that finds files and line ranges with two ingredients: a stateless in-memory BM25 pass for recall and Jev calibrated judgments for precision. No embeddings, no vector database, no index directory, no repository state.
Jev Agents & MCP#community#jevbest#catalog-import
Community
romeromarcelo/jev-retrievalRust
romeromarcelo/jev-retrievalRust0GitHub stars
Atari Pong where Jev answers one question per frame - which way should the paddle move, up, down or stay - while all arithmetic stays in code and the model is sent five short phrases. Includes a local court to duel it on.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
safzanpirani/pong-jevTypeScript
safzanpirani/pong-jevTypeScript2GitHub stars
A visual lab where Jev plays Mario, Kung Fu and Doom, with a plugin split so new games and emulators do not require rewriting the loop. Code owns buttons, hold duration and Mario landing interrupts; Step and Scripted keep the API bill down.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
shantanugoel/jev-gamesPython
shantanugoel/jev-gamesPython0GitHub stars
Four commits on a vercel-deploy branch holding four HTR-questions JSON shards and an htr-hero directory — a test of asking a blog's articles as chat, with no build manifest at the root and no README.
Jev Demos & Experiments#community#jevbest#catalog-import
0GitHub stars
Three composable Jev judgment pipelines at roughly 120 lines of composition logic each: support-ticket triage behind a safety guardrail, observability alert triage with dedupe and auto-page decisions, and a deploy risk gate over PR diffs.
Jev Tools & CLIs#community#jevbest#catalog-import
0GitHub stars
Checks a text message for scam signals and turns them into an explainable verdict: code extracts link and sender signals, one parallel Jev call answers eleven typed questions, and a pure policy function weights them into a risk score.
Jev Tools & CLIs#community#jevbest#catalog-import
Community
ShupingR/scam-shieldTypeScript
ShupingR/scam-shieldTypeScript1GitHub stars
CLI that normalizes messy Japanese addresses to postal codes using Japan Post KEN_ALL and JIGYOSYO master data, asking Jev only for the steps rules and lookups cannot settle, and printing the probability behind each decision.
Jev Practices & Patterns#community#jevbest#catalog-import
Community
smasato/jev-jp-addressTypeScript
smasato/jev-jp-addressTypeScript3GitHub stars
Python adapter that puts Jev's Noul, Choice and Score checks inside Mellea generation flows: verify a requirement, classify text into caller-defined categories, or rate it on an ordered scale, each attachable as a Mellea Requirement.
Jev Integrations & Adapters#community#jevbest#catalog-import
Community
SoundBlaster/Jev4MelleaPython
SoundBlaster/Jev4MelleaPython0GitHub stars
OMP plugin that judges bash commands and process-spawning eval payloads with Jev before they run, adding a real permission prompt in yolo mode while leaving your existing deny, prompt and narrow allow rules untouched.
Jev Agents & MCP#community#jevbest#catalog-import
Start here with Jev
Hand-picked entries the maintainers recommend first, from official primitives to community tools.
Published evaluations of four automation workflows, security incidents, agent trace observability, invoice processing, and customer service, comparing Jev and frontier LLMs as structured workflows versus single prompts.
Jev Practices & PatternsDocs#official#benchmarks#evaluation
Official
6GitHub stars
.NET SDK for the System One API with typed question sets, HttpClientFactory and dependency-injection wiring, plus Microsoft.Extensions.AI guardrail, routing, tool, and evaluator adapters.
Jev Repos & SDKs#community#sdk#csharp
Community
Hawxy/TypeSafeAI.NetC#
Hawxy/TypeSafeAI.NetC#0GitHub stars
A NativeAOT-ready .NET SDK generated from TypeSafe's OpenAPI definition, with typed question sets, batching, dependency injection, and Microsoft.Extensions.AI integrations.
Jev Repos & SDKs#community#sdk#csharp
Community
tryAGI/TypeSafeAIC#
tryAGI/TypeSafeAIC#Newest Jev resources
The latest additions to the directory, newest first.
Watch: Jev in action
Walkthroughs, tests, and demos from the community.
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.
Discussions about Jev
Threads from Reddit and Hacker News about building with Jev.
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 hand-picked 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 Jev?
Jev is TypeSafe AI's first System One model. It 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, so 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 hand-picked, 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 2231 entries from 148 source sites, last updated Oct 12, 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. 2231 of the 2231 entries carry one today.
For the canonical details, read the official TypeSafe docs and the API reference.
From the Jev community
Posts from builders shipping with Jev right now.