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 433–480 of 625 resources
0GitHub stars
Elixir client for the TypeSafe AI System One API: supervised Mint HTTP/1 and HTTP/2 connections, bounded concurrency, request deadlines, retries and telemetry, with typed Choice, Score and Noul answers.
Jev Repos & SDKs#community#jevbest#catalog-import
Community
hfiguera/typesafe_aiElixir
hfiguera/typesafe_aiElixir3GitHub stars
Fifteen independent local plugins for the Paseo desktop app, two of which use Jev: an evaluator exposed to Codex and Claude agents over MCP, and an orchestrator that routes a task to one model profile and effort level.
Jev Integrations & Adapters#community#jevbest#catalog-import
Community
HiepPP/hiep-paseo-pluginTypeScript
HiepPP/hiep-paseo-pluginTypeScript0GitHub stars
An empty GitHub repository named jev-finance-benchmark. The page shows no description, no topics, no commits, no files and no license — there is nothing published here to read, run or evaluate.
Jev Practices & Patterns#community#jevbest#catalog-import
Community
hifizz/jev-finance-benchmark
hifizz/jev-finance-benchmark1GitHub stars
Experimental Snake environment where the engine owns the deterministic rules and Jev picks every direction from structured state, with a browser human baseline and a pygame client sharing one fixed server clock.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
iammusham/jev-snakePython
iammusham/jev-snakePython2GitHub stars
Jev plays the hosted RALLY browser game live: structured telemetry in, typed Choice decisions out, executed through ordinary Chrome input by a dependency-free Node controller that records every decision it made.
Jev Demos & Experiments#community#jevbest#catalog-import
1GitHub stars
Upload a PDF and get an understandability and completeness judgment back in seconds: the browser extracts passages, a Cloudflare Worker judges each one in parallel with typed System One questions and visible rubric arithmetic.
Jev Demos & Experiments#community#jevbest#catalog-import
1GitHub stars
Ground-truth benchmark data for Jev and six LLMs answering the same typed questions on PubMedQA, Banking77 and HelpSteer2, published as a board plus per-decision JSONL logs so every number can be recomputed.
Jev Practices & Patterns#community#jevbest#catalog-import
Community
Jevals/jevals-data
Jevals/jevals-data1GitHub stars
Plugin for Claude Code and Codex CLI that turns project rules into typed Jev questions a lifecycle hook uses to block a tool call or a final response, instead of trusting the agent to remember them.
Jev Agents & MCP#community#jevbest#catalog-import
Community
Jhonnyr97/JevGuardTypeScript
Jhonnyr97/JevGuardTypeScript0GitHub stars
A read-only market demo that pulls Coinbase trades for BTC, ETH and XRP, folds the last 60 seconds into up to twelve five-second OHLC samples, and asks one shared Jev request for a buy/wait call per coin.
Jev Demos & Experiments#community#jevbest#catalog-import
7GitHub stars
The Chromium offline T-Rex Runner extracted into a standalone ES6 Runner class with no circular dependencies, plus an optional Jev controller that picks a maneuver and jump profile per obstacle.
Jev Demos & Experiments#community#jevbest#catalog-import
0GitHub stars
A browser-based planetary rover sandbox with a keyless local 3D baseline and an optional selectable TypeSafe controller, where every decision can be inspected, held in teaching mode, saved, replayed and compared against the baseline.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
juancamiloqhz/roverlabTypeScript
juancamiloqhz/roverlabTypeScript0GitHub stars
An unaffiliated, API-only audit of Jev calibration built on roughly 7,000 public HTTP calls, covering abstention, Korean, probabilistic coherence, option order, question interference, caching and latency, with a drift ledger.
Jev Practices & Patterns#community#jevbest#catalog-import
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 Qwen3-Reranker-0.6B judge that returns choice, score and noul answers from yes/no scores rather than generated text, LoRA-tuned on JGLUE NLI and STS and served from a local FastAPI app.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
karimatayuta/tiny-jevHTML
karimatayuta/tiny-jevHTML0GitHub 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-browserPython0GitHub stars
A sparse-checkout research workspace of independent lab write-ups, two of which cover Jev: one on API behaviour, input limits and multilingual evaluation, another on moderation and pre-execution command risk checks.
Jev Practices & Patterns#community#jevbest#catalog-import
Community
kiarina/labsDart
kiarina/labsDart0GitHub stars
A Manifest V3 Chrome extension that annotates X, Threads and articles with typed Jev decisions, analysing up to three post images locally and sending only sanitized structured evidence to the API.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
knowlet/jevlensJavaScript
knowlet/jevlensJavaScript2GitHub 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-jevRust1GitHub stars
Three.js drone flight simulation where a typed FastAPI backend asks jev-latest for every navigation action: a Choice question selects one of nine candidate movements, an independent Noul question estimates whether the direct route is blocked.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
kxzk/typesafe-jev-drone-demoPython
kxzk/typesafe-jev-drone-demoPython1GitHub stars
A janitor for markdown vaults that asks Jev which bucket each note belongs in. It never deletes a note and never rewrites a body; the most it does is add a frontmatter block or move a suspected secret into quarantine, after local redaction.
Jev Tools & CLIs#community#jevbest#catalog-import
Community
kylehovance-ai/jev-the-janitorPython
kylehovance-ai/jev-the-janitorPython0GitHub 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/beatjevJavaScript0GitHub stars
An experimental design harness that splits the work: Jev picks layout, blocks, colours and typography from a prebuilt catalog in about a second, while an optional small LLM fills typed text slots a few seconds later.
Jev Demos & Experiments#community#jevbest#catalog-import
0GitHub stars
A thin Node CLI over the System One API: pass a state string and a question map, get typed answers with probabilities, confidence, latency and token counts back as JSON, one at a time or through a batched worker pool.
Jev Repos & SDKs#community#jevbest#catalog-import
Community
lhotwll217/jev-cliTypeScript
lhotwll217/jev-cliTypeScript3GitHub 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
Pulls financial news from configurable sources, scores every article with Jev on a -1 to +1 scale with confidence and relevance weighting, and aggregates one number per symbol, from Python, sync or async, or the CLI.
Jev Tools & CLIs#community#jevbest#catalog-import
Community
mahynotch/newsscorePython
mahynotch/newsscorePython0GitHub 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 reproducible English benchmark running one review-classification rubric through jev-latest and gpt-5.6-luna, publishing per-field accuracy, macro F1, latency and API-reported cost alongside the raw responses and run manifest.
Jev Practices & Patterns#community#jevbest#catalog-import
Community
mameli/jev-vs-lunaPython
mameli/jev-vs-lunaPython3GitHub stars
Python decision models meant to replace LLM calls for routing, triage, guardrails and policy checks: ask choose, score or check questions and get a typed answer with a temperature-scaled probability on CPU.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
Manavarya09/verdictPython
Manavarya09/verdictPython0GitHub 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/frostGo1GitHub stars
JEVRACE is a public archive of a racing experiment: ten driver prompts, thirty recorded races and six circuits, watchable in the browser with no API key and no further inference calls.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
MartinPuli/f1JavaScript
MartinPuli/f1JavaScript2GitHub 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 research repository that asks how a teacher should rewrite the structured questions controlling an Atari player, publishing the negative results alongside the one that worked. Jev weights stay fixed throughout.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
memorysaver/jev-atari-labPython
memorysaver/jev-atari-labPython0GitHub 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 Japanese word game for two to four players where you take turns inventing words nobody has said before. Jev judges whether each word exists across seven angles, and only boundary cases go to a second model.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
mocchalera/naimono-labJavaScript
mocchalera/naimono-labJavaScript0GitHub 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-riskTypeScript1GitHub stars
Measures whether Jev can catch malicious agent skills on MalSkillBench, with a cascade arm that sends only the uncertain band to an LLM. Per-sample records, thresholds and calibration are all kept.
Jev Practices & Patterns#community#jevbest#catalog-import
Community
MohibShaikh/jev-skillbenchPython
MohibShaikh/jev-skillbenchPython0GitHub 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/harnessjudgeTypeScriptStart 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.