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 673–720 of 736 resources
0GitHub stars
Study of whether a calibrated judgment primitive can tell agent-written wiki pages from human ones, using the collusion.wiki corpus, Jev's Noul against a local Qwen, and a threshold sweep that finds no separating cutoff.
Jev Practices & Patterns#community#jevbest#catalog-import
Community
sypherin/jev-trace-classifierPython
sypherin/jev-trace-classifierPython0GitHub stars
Sandbox where a small creature's controls are chosen by Jev while the code runs the world: one request per step, a Choice over eleven controls plus a per-object fan-out, and a decision log with every probability and every overruled judgment.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
TheGali/terrariumJavaScript
TheGali/terrariumJavaScript0GitHub stars
Autonomous PR review bot that consumes PR metadata and patches, asks Jev a finite set of typed questions across correctness, security and verification perspectives, then applies deterministic gates in code. Suggestions are advisory; it never edits or merges.
Jev Agents & MCP#community#jevbest#catalog-import
Community
thiago-ss/jev-reviewPython
thiago-ss/jev-reviewPython0GitHub stars
A single untitled Python file, one commit, no stars: an attempt to see how well Jev predicts financial markets, in a repository whose own description concedes that it does not do that well.
Jev Practices & Patterns#community#jevbest#catalog-import
Community
thodoh1/FinancialPredictionJevPython
thodoh1/FinancialPredictionJevPython10GitHub stars
Two Jev players playing chess with no engine: code owns the rules and the tactical facts, and the model returns one Choice per legal move with a probability for each, plus a Score for the position and a Noul for sharpness.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
TholeG/typesafe-chessJavaScript
TholeG/typesafe-chessJavaScript0GitHub stars
Typed Rust client for TypeSafe's System One API that sends shared state with independent Choice, Score and Noul questions, validates the provider's response against the originating request, and returns latency, attempts and usage with the answers.
Jev Repos & SDKs#community#jevbest#catalog-import
Community
tinyhumansai/tinyjevclientRust
tinyhumansai/tinyjevclientRust0GitHub stars
Social-deduction party game where the TV moderates: humans play on their phones, and one fast structured Jev judgment per round turns game state into per-player suspicion meters, with decisions and thresholds left in code.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
tpaulshippy/shady-townRuby
tpaulshippy/shady-townRuby1GitHub stars
A MuJoCo pick-and-place pilot that runs Jev, Claude Haiku and hand-written reactive rules through the same episodes and publishes the comparison, including the parts that did not flatter Jev.
Jev Practices & Patterns#community#jevbest#catalog-import
0GitHub stars
A Pi extension that runs four hazard checks before bash, write and edit and four diff-quality checks afterwards, sharing one System One request per phase and applying its own thresholds.
Jev Agents & MCP#community#jevbest#catalog-import
Community
twilwa/pi-typesafeTypeScript
twilwa/pi-typesafeTypeScript0GitHub stars
Chrome extension that re-ranks Google results with TypeSafe Jev: five atomic questions per result, a weighted score, sales pages flagged and hidden, and a button to restore Google's order.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
tylergibbs1/siftTypeScript
tylergibbs1/siftTypeScript0GitHub stars
Unofficial typed Elixir client for the TypeSafe System One API: typed question structs in, typed answer structs out, atom-keyed answers, concurrent fan-out over many states and offline test stubs.
Jev Repos & SDKs#community#jevbest#catalog-import
Community
typesend/typesafe_aiElixir
typesend/typesafe_aiElixir1GitHub stars
Experimental Hermes plugin that asks Jev to label task complexity, then deterministic policy code picks the cheapest eligible allowed model and returns a routing plan. It does not dispatch the request.
Jev Agents & MCP#community#jevbest#catalog-import
Community
ussyverse/hermes-jev-routerPython
ussyverse/hermes-jev-routerPython0GitHub stars
Unofficial Go client for the TypeSafe System One API, aiming for 1:1 parity with the official JavaScript and Python SDKs: typed Noul, Choice and Score, status-specific errors, and an injectable http.Client.
Jev Repos & SDKs#community#jevbest#catalog-import
Community
valksor/typesafe-sdk-goGo
valksor/typesafe-sdk-goGo0GitHub stars
Unofficial PHP client for the TypeSafe System One API: strictly typed, zero framework dependencies, a cURL transport you can swap, and optional ResponseModel classes that decode answers into your own objects.
Jev Repos & SDKs#community#jevbest#catalog-import
Communityvalksor/typesafe-sdk-phpPHP
valksor/typesafe-sdk-phpPHP0GitHub stars
Static chart pages comparing Jev against 110 other language models on Thai standardized exams: cost and speed plotted against accuracy, plus a page on whether its stated confidence predicts correctness.
Jev Practices & Patterns#community#jevbest#catalog-import
Community
vehas/thaiexam-jev-chartsHTML
vehas/thaiexam-jev-chartsHTML2GitHub stars
SIEGE puts a live support agent with seven real tools in front of 200 attackers; every proposed call passes a TypeSafe System One action gate, and a defender loop rewrites the gate from each breach it observes.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
vnmoorthy/siegeTypeScript
vnmoorthy/siegeTypeScript0GitHub stars
Browser-first workbench that turns selected CSV rows into Jev judgments: up to 20 Noul, Choice and Score questions per row, with the file parsed in memory and requests proxied through a Cloudflare Worker.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
WebGrga/jev-board-labJavaScript
WebGrga/jev-board-labJavaScript0GitHub stars
A TypeScript CLI and Fastify service that puts three questions about an occupation to Jev in one request - layoff risk, trajectory and human accountability - and derives a resilience score in app code.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
WeSecureYou/Jev-testTypeScript
WeSecureYou/Jev-testTypeScript0GitHub stars
A FastAPI app that turns a text prompt into 16x16 pixel art by asking Jev 256 parallel Choice questions, one per pixel over a 16-colour palette, then refining the grid.
Jev Demos & Experiments#community#jevbest#catalog-import
2GitHub stars
A Vite app where Jev picks only closed-enum labels for a composition plan and code expands those into notes, engraving, audio and MIDI, with an offline heuristic stub when no key is set.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
wustep/jev-playgroundTypeScript
wustep/jev-playgroundTypeScript2GitHub stars
Tetris where Jev picks every move from the seven legal options, but the game pre-computes landings, holes, roughness and a best plan so the model only ever judges outcomes.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
Yasserbhb/Agent-JEV-TetrisHTML
Yasserbhb/Agent-JEV-TetrisHTML0GitHub stars
A provider-agnostic TypeScript judgment layer for coding agents, with gates from PRD intake through release, a pluggable judge backend and a decision log you can replay.
Jev Agents & MCP#community#jevbest#catalog-import
Community
Zahrannnn/zcode-jevTypeScript
Zahrannnn/zcode-jevTypeScript0GitHub stars
An experimental specification and offline evaluation kit for delegated coding work: evidence schemas, a gate protocol for PASS and BLOCKED reports, and a Jev integration contract.
Jev Agents & MCP#community#jevbest#catalog-import
Community
zsoXi/agent-handoff-gatePython
zsoXi/agent-handoff-gatePython1GitHub stars
Manifest V3 Chrome extension that asks nine parallel Jev questions about the page you are on to separate advertising from first-hand account, across genre, stance, publisher, product and four Noul checks.
Jev Demos & Experiments#community#awesomejev#catalog-import
0GitHub stars
Decision Graph Protocol from Numerous ApS: the app publishes an immutable frame of evidence and offered decisions, an eligible assessor returns a typed assessment, and the app's own guards authorize the commit.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
numerous-com/dgpPython
numerous-com/dgpPython0GitHub stars
Dependency-free Python 3 CLI that hands a JSON state plus 1 to 16 named Noul, Choice or Score questions to Jev and prints typed answers, usage and elapsed time without echoing the state back.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
ohmyjiro/jev-judgePython
ohmyjiro/jev-judgePython0GitHub stars
Claude Code plugin with nine Jev-judged gates over edits, prompts, shell commands, stops and commits. Each one escalates to a permission prompt, and none of them can approve an action.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
rashedInt32/jev-gatesJavaScript
rashedInt32/jev-gatesJavaScript1GitHub stars
MCP server that layers a reach tool onto chrome-devtools-mcp: Jev picks each click and typed value so your agent states a goal once, then makes one devtools call at the destination.
Jev Demos & Experiments#community#awesomejev#catalog-import
CommunityrashedInt32/jev-reachTypeScript
rashedInt32/jev-reachTypeScript22GitHub stars
Local decision models that return Jev-shaped typed distributions instead of generated text: freeze a backbone, cache candidate features once, train a roughly 0.8M-parameter decision head, calibrate per primitive.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community
zeredy879/minojevPython
zeredy879/minojevPython0GitHub stars
ACP stdio agent that evaluates explicit Choice, Score and Noul questions as typed Jev answers inside any Agent Client Protocol client or IDE, driven by a task picker rather than free-form chat.
Jev Integrations & Adapters#community#awesomejev#catalog-import
Community
formulahendry/jev-acpTypeScript
formulahendry/jev-acpTypeScript1GitHub stars
Unreleased Rails engine that turns Ruby-defined commands into voice and typed shortcuts, using Jev to interpret free-form phrasing while your own authorize callbacks keep the permission decision.
Jev Integrations & Adapters#community#awesomejev#catalog-import
0GitHub stars
Alpha OpenTelemetry Collector processor that scores operation metadata with three Jev noul questions, caches the result, and writes it onto later matching spans as jevtraces.operation annotations.
Jev Integrations & Adapters#community#awesomejev#catalog-import
Community
ishantanu/jevtracesGo
ishantanu/jevtracesGo19GitHub stars
Apache-2.0 router that runs inside Claude Code or Codex: Jev classifies the task, a local policy picks the model and reasoning effort, and the pair stays pinned for the whole conversation.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
ruban-24/switchboardTypeScript
ruban-24/switchboardTypeScript9GitHub stars
Unofficial Kotlin Multiplatform client for Jev across JVM, Android and iOS. You declare the decision as an enum implementing Criterion and read back typed answers, distributions and confidence.
Jev Repos & SDKs#community#awesomejev#catalog-import
Community
ItisNoMatter/kojevKotlin
ItisNoMatter/kojevKotlin10GitHub stars
GPL-3.0 desktop app for Linux, macOS and Windows that gives every coding-agent task its own git worktree and its own terminal, with live diffs and optional Jev review of changed files.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
joaoh82/yardsortRust
joaoh82/yardsortRust0GitHub stars
A React and Three.js coffee-delivery arena shooter whose enemies score their own tactics locally, with a decision record explaining why Jev was retired from that job.
Jev Demos & Experiments#community#awesomejev#catalog-import
Communityjoaoh82/coffee-under-fireTypeScript
joaoh82/coffee-under-fireTypeScript1GitHub stars
Jev run against a community reconstruction of Indonesia's SNBT 2025 entrance exam: 159 remembered questions across seven subtests, 156 scored, with every request payload and response kept.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community
misaalya/snbt-jev-benchPython
misaalya/snbt-jev-benchPythonTypeSafe's official docs: the System One introduction, the three question primitives, confidence, composable patterns, cookbooks, and the HTTP API and SDK references.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
A Hugging Face Space by drinkmoonshine for parallel constrained decoding. The captured page gives the name and owner only, with no Jev or System One detail anywhere.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
A computer-use loop built on Jev: OCR the screen, attach bounding rects to text areas, then ask Jev which item moves the goal forward and click that item.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
Steve Krouse posted a playable hosted Jev demo and linked to it. The thread describes the demo not at all; a reply raises a $2 budget and a complaint about speed.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
A developer rebuilt the same app on Cerebras with Qwen 3.8 27B and reports TypeSafe was cheaper and beat it on performance at similar quality. The benchmark itself is not shown.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
A browser extension that hides or collapses individual posts on X from natural-language rules, using Jev to judge each post. The announcement names no install, code or rule syntax.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
An agentgateway example that scores prompts and responses for jailbreaks, harmful content and secret disclosure with Jev, rejecting anything scoring 2 or above with HTTP 403.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
A browser tool where you paste a Telegram channel JSON export and each post gets four Jev labels: category, quality, sentiment and reaction tone, written out as result.json.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
DMX is a $19 macOS X client that embeds the real x.com interface for DMs and notifications while capping timeline browsing at five minutes an hour. No Jev integration is documented.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
A CLI where you give it a task plus the AI subscriptions you already have, and Jev picks which agent or model should handle it, paired with Herdr to route from one terminal.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
A small support ticket classifier where Jev decides category, urgency and whether a ticket needs a human, replacing a GPT-based version of the same flow.
Jev Guides & ArticlesArticle#community#awesomejev#catalog-import
Community
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.