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 865–912 of 954 resources
0GitHub stars
A measurement study that scores Jev against gpt-5.4-mini and gpt-5.6-luna on four public classification sets, then against recorded outcomes on a few thousand real pipeline decisions. Every per-item answer and the scoring code are committed.
Jev Practices & Patterns#community#jevbest#catalog-import
Community
onlyoneaman/jev-evalTypeScript
onlyoneaman/jev-evalTypeScript0GitHub 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
0GitHub stars
A public benchmark that scores Jev 1.13.0 on the Brazilian ENEM 2025 exam against open autoregressive baselines, reporting accuracy per subject area plus Expected Calibration Error, with a second pass that lets the model reject an item.
Jev Practices & Patterns#community#jevbest#catalog-import
Community
patryckalves/jev-no-enemPython
patryckalves/jev-no-enemPython0GitHub stars
A calculator that lets Jev produce the digits: every step offers the same 13 options, a Cloudflare Worker forwards one System One choice request, and the page renders the per-step probability grid instead of a verified answer.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
pc418/jev-calculatorTypeScript
pc418/jev-calculatorTypeScript1GitHub 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
Compacts Hermes transcripts by scoring every tool call with Jev: stale calls are dropped, stale results truncated, and protected tools such as write_file and patch are always kept. Nothing is ever summarised.
Jev Agents & MCP#community#jevbest#catalog-import
Community
picaye/jev-compactionJavaScript
picaye/jev-compactionJavaScript0GitHub stars
An index and Cursor marketplace for four JEV Labs routers: memory_select filters retrieved memories under a token budget, agent_route picks or abstains, model_route routes an LLM, and mcp_select picks MCP tools without executing them.
Jev Agents & MCP#community#jevbest#catalog-import
Community
Pinutss/jev-plugins
Pinutss/jev-plugins3GitHub 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
2GitHub stars
Two worked Jev examples you can run today through OpenRouter without an early-access key: seven-question ticket triage batched into one request, and a re-ranker that fans one question out per candidate and sorts on the returned probability.
Jev Demos & Experiments#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
Real-time market analysis where a local Node bridge calls Jev through the Vercel AI Gateway: headline sentiment, plus buy, sell or hold bias with strength and conviction for an FX, metals, energy, rates and crypto basket fed from MetaTrader5, with a local dashboard.
Jev Tools & CLIs#community#jevbest#catalog-import
Community
renatosousa/jev-traderPython
renatosousa/jev-traderPython0GitHub 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-loopTypeScript0GitHub stars
A Next.js spectator app where two independent Jev agents play Snake against each other, each spectator page running its own match. Jev is reached only through Vercel AI Gateway, and an empty key gives you a labelled demo-policy match instead.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
rolki-png/JevArenaTypeScript
rolki-png/JevArenaTypeScript6GitHub 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
Unofficial, dependency-free Go client for TypeSafe's System One API. Calls Jev with Noul, Choice and Score questions in one request, returns typed answers and a typed error ladder, and mirrors the official Python and JavaScript SDKs' retry policy.
Jev Repos & SDKs#community#jevbest#catalog-import
Community
Shubham510/typesafe-goGo
Shubham510/typesafe-goGo0GitHub 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/Jev4MelleaPython3GitHub stars
Medium-term crypto trend-following bot that uses Jev to read and sort crypto, political, central bank, regulator and exchange news, then applies the result as a small news bias and a regulatory veto on a 4-hour EMA strategy.
Jev Tools & CLIs#community#jevbest#catalog-import
Community
Spykoninho/trading-bot-jevTypeScript
Spykoninho/trading-bot-jevTypeScript0GitHub 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
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/tinyjevclientRust4GitHub stars
A bring-your-own-key tool that pastes a public note.com article URL and returns Jev's whole-article writing-quality judgment plus eight detail signals as an AI Slop Score. Cloudflare Pages deploy, MIT licensed, explicitly not an authorship detector.
Jev Tools & CLIs#community#jevbest#catalog-import
Community
TKY-27/JevSlopTypeScript
TKY-27/JevSlopTypeScript0GitHub 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/siegeTypeScript2GitHub stars
jevkit is a single dependency-free Node binary exposing eleven Jev-backed decisions as both shell commands and MCP tools, including guard for gating an action, plus route, triage and semantic grep over log files.
Jev Agents & MCP#community#jevbest#catalog-import
0GitHub 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 pre-registered adversarial evaluation of jev: nine experiments, 28 predictions fixed before any request was sent, and a report plus prompting guide regenerated from the measured logs.
Jev Practices & Patterns#community#jevbest#catalog-import
Community
willkelly/jev-evaluationPython
willkelly/jev-evaluationPython0GitHub 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-playgroundTypeScriptStart 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.