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 577–624 of 954 resources
3GitHub stars
A community-maintained .NET 10 client for the official TypeSafe Jev API, covering the Choice, Score and Noul primitives with Microsoft.Extensions.AI composition, model discovery and ten runnable samples. Released as tentative 0.6.0 with live compatibility unverified.
Jev Repos & SDKs#community#awesomejev#catalog-import
Community
elbruno/ElBruno.AI.JevC#
elbruno/ElBruno.AI.JevC#8GitHub stars
A Chrome extension that blocks ads with no filter lists at all. Each ad-shaped element is described in a few structural fields and sent to Jev as one batched Choice question per element, with every threshold owned by code.
Jev Demos & Experiments#community#awesomejev#catalog-import
Community
fazlerocks/jev-adblockTypeScript
fazlerocks/jev-adblockTypeScript6GitHub stars
An n8n community node that classifies, scores and checks text with Jev, shaped like the built-in Text Classifier with one output branch per category plus a Needs Review branch, and built for volume with parallel requests and packed batches.
Jev Integrations & Adapters#community#awesomejev#catalog-import
2GitHub stars
Archived. A Jev-compatible HTTP server that lets any Jev client run against local Laya weights instead of the TypeSafe API, serving POST /v1/systemone with typed choice, score and noul answers. Upstream laya now ships this natively.
Jev Demos & Experiments#community#awesomejev#catalog-import
Community
stiermid/laya-servePython
stiermid/laya-servePython7GitHub stars
A DSH plugin that asks Jev once per turn how much reasoning effort a message deserves and rewrites that turn's effort level, so greetings stop running at high and follow-ups after a complex refactor stop running at low.
Jev Agents & MCP#community#awesomejev#catalog-import
5GitHub stars
A Chrome extension that stamps every LinkedIn post it sees as BAIT, CORP or BRAG with the confidence score on the stamp, leaving the post readable underneath. Judgements come from Jev, branch on a number, and never parse prose.
Jev Demos & Experiments#community#awesomejev#catalog-import
2GitHub stars
Unfold, a depth-crawling research agent that routes every per-page decision through Jev while a general model is called only twice per run. Pages fan out, get triaged and judged one at a time, and the survivors converge into a cited report.
Jev Practices & Patterns#community#awesomejev#catalog-import
2GitHub stars
A Claude Code and Codex skill that fires before code is written, splits a feature into atomic steps and assigns each one Jev, an LLM, or plain code.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
BenjaminPolge/jev-architect
BenjaminPolge/jev-architect2GitHub stars
A personal-use Chrome extension that scores X timeline posts on five weighted dimensions with Jev and dims or collapses what falls below your thresholds, with no summaries or reordering.
Jev Tools & CLIs#community#awesomejev#catalog-import
Community
vladzima/jev-xJavaScript
vladzima/jev-xJavaScript2GitHub stars
A Python keep/drop gate that decides which SKILL.md files enter the prompt before the first model message, from offline keyword overlap or from Jev Noul and Choice scores.
Jev Agents & MCP#community#awesomejev#catalog-import
3GitHub stars
A TypeScript framework that puts a System 1 decision layer in front of agent micro-decisions, shipped as a Claude Code plugin, an MCP server and a CLI, with an offline simulator.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community
Kadihx/jev-x-kitTypeScript
Kadihx/jev-x-kitTypeScript13GitHub stars
A market decision loop that feeds simulated stock, crypto and meme states to Jev or a local engine, then gates each answer. Execution is paper only and there is no live flag.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community
bl888m/jev-botPython
bl888m/jev-botPython2GitHub stars
A Next.js reading feed that pulls metadata from Hacker News, Dev.to, Hashnode and Lobsters, then ranks each article against your skill summary with batched Jev score calls.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
iikareem/skillfeedTypeScript
iikareem/skillfeedTypeScript3GitHub stars
A C# client for the TypeSafe System One API with one dependency, a faithful port of the official Python SDK's behaviour, and typed answers bound to properties by name.
Jev Repos & SDKs#community#awesomejev#catalog-import
Community
brightshore/jev-netC#
brightshore/jev-netC#2GitHub stars
A guessing game where you describe a UI component to Jev without naming it, and the model re-ranks 135 components and puts live odds on every one of them.
Jev Demos & Experiments#community#awesomejev#catalog-import
2GitHub stars
A self-hosted tool that reads a pasted two-person chat and labels each side: their emotion and intent, your reply rating, one affection score for the exchange.
Jev Tools & CLIs#community#awesomejev#catalog-import
Community
zhengge6/haoganTypeScript
zhengge6/haoganTypeScript2GitHub stars
A skill and MCP server that drives a real browser for coding agents. One Jev request per step picks the action and the target, and the control loop stays in code.
Jev Demos & Experiments#community#awesomejev#catalog-import
Community
ChenYCL/jev-browser-skillJavaScript
ChenYCL/jev-browser-skillJavaScript2GitHub stars
A PAVE app and CLI for typed decisions (choice, score and noul) with calibrated probabilities, four providers including a local engine, and eval and calibrate commands.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community
cnrai/openpave-jevJavaScript
cnrai/openpave-jevJavaScript2GitHub stars
Offline linter and agent skill that checks Jev requests for 45 structural problems before you send them, so a badly designed Choice question fails locally instead of coming back as a confident wrong label.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
suraj-phanindra/wellposedJavaScript
suraj-phanindra/wellposedJavaScript6GitHub stars
A pip-installable Python package that sits between a noisy source and Jev: ten adapters condense logs, diffs, tool lists, traces, alerts and screens into small state with a reason for every drop, then record a replayable trace.
Jev Demos & Experiments#community#awesomejev#catalog-import
Community
Parthkomalwad/jevbriefPython
Parthkomalwad/jevbriefPython2GitHub stars
Hooks that put Jev in two spots of a coding agent's loop, picking which skill a turn needs and which model tier a subagent gets, with deterministic rule gates in front and fail-open behaviour everywhere else.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
onlyjq04/jev-agent-hooksJavaScript
onlyjq04/jev-agent-hooksJavaScript1GitHub stars
A small Chinese-language DingTalk toolbox: the dws CLI pulls unread mail and chat into JSON, `jev mail` and `jev triage` classify it, and standard-library Python renders a report of who is waiting on a reply.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
ikashana/jev-dingtalkPython
ikashana/jev-dingtalkPython15GitHub stars
A Claude Code plugin, with a separate Codex folder, that classifies each message you send while the agent is working as steer, queue or interrupt, and holds the queued ones in a per-session FIFO for replay after the turn.
Jev Agents & MCP#community#awesomejev#catalog-import
6GitHub stars
A Claude Code and Codex plugin that keeps skill bodies off your prompt: a hook asks Jev, per turn, whether each skill's instructions would be used now, and injects only the ones above a threshold.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
eran-broder/jev-skillsTypeScript
eran-broder/jev-skillsTypeScript7GitHub stars
Three prompts, written in Italian, that you paste into a Claude Code session to build a Jev model router, a Jev-driven context compactor and a diff reviewer that emits a verdict, with nothing to install.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
DarioFontanel/jev-claude-code
DarioFontanel/jev-claude-code4GitHub stars
An OpenCode plugin that asks Jev, per tool call, whether the call and its result are still needed, then drops or truncates them in the outgoing request while leaving your saved history untouched.
Jev Agents & MCP#community#awesomejev#catalog-import
2GitHub stars
A single-file Python script that signs into Bilibili's hardcore member quiz after one QR scan, sends each multiple-choice question to Jev for a pick and a confidence, and submits a full round unattended.
Jev Tools & CLIs#community#awesomejev#catalog-import
2GitHub stars
An Astro 5 and TypeScript app that pulls Google Maps restaurant reviews from Apify into Supabase and classifies each one with Jev across five operational pillars, with generative models behind the same interface.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community
halfspin-qc/jev-reviewsAstro
halfspin-qc/jev-reviewsAstro2GitHub stars
A Python CLI that asks Jev which of four coding agents should take a task, optionally waits for your approval, then opens that app or its website and pastes the prompt in.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
AABBAASS1/jev-routerPython
AABBAASS1/jev-routerPython4GitHub stars
A Python CLI that takes a CSV, JSON file or directory plus a plain-language goal, has an LLM normalise it into a FeatureTable, grows an information-gain decision tree, and exports a runnable DecisionSOP with a trace.
Jev Tools & CLIs#community#awesomejev#catalog-import
Community
qzqdz/jevtreePython
qzqdz/jevtreePython2GitHub stars
Doom flown as a spacecraft payload: a ground-side jev pilot picks where to go every half second while F´ flight software, CCSDS frames, Yamcs and Open MCT carry the telemetry and video down.
Jev Demos & Experiments#community#awesomejev#catalog-import
Community
Devonance/DoomSatPython
Devonance/DoomSatPython2GitHub stars
An Apache-2.0 attempt at an open Jev: a System-1 decision model returning calibrated probabilities per option, with option branches packed so answers do not change when the option list is reordered.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community
Readyaddy/open_system_onePython
Readyaddy/open_system_onePython5GitHub stars
Scores HeyReach leads and first-message variants with jev, then writes the ranking back as lead lists and DRAFT campaigns. The code can read your workspace and draft campaigns, but it cannot send anything.
Jev Tools & CLIs#community#awesomejev#catalog-import
5GitHub stars
A point-in-time backtest of a William O'Neil momentum strategy where jev picks the entries and decides the exits, paired against the same rules with no model — and honest enough to report the model as indistinguishable from them.
Jev Tools & CLIs#community#awesomejev#catalog-import
Community
michaelpersonal/jev-trade-ccPython
michaelpersonal/jev-trade-ccPython3GitHub stars
A single Markdown reference for building with jev: API guidance, typed question patterns, known limitations, a worked ticket-router example with offline tests, and a handover template for resuming in a new session.
Jev Practices & Patterns#community#awesomejev#catalog-import
4GitHub stars
A DeepSeek Harness plugin registering a `jev_decide` tool so an agent can put choice, score and boolean questions to any OpenAI-compatible model — or to the real Jev API if you have a key.
Jev Agents & MCP#community#awesomejev#catalog-import
2GitHub stars
Paste a two-person chat into a local Node app and get jev's read of it: emotion and intent on their messages, a rating on yours, one favourability score for the exchange, and a scenario selector so mentor concern is not scored as romance.
Jev Tools & CLIs#community#awesomejev#catalog-import
Communityzhengge6/jev-crushTypeScript
zhengge6/jev-crushTypeScript3GitHub stars
Reads typed probabilities out of a masked diffusion language model: a shared Yes/No head with a mask beside each candidate answers choice, boolean and ordered-score questions without generating text. Ships an S1 checkpoint, a 17-suite benchmark and a local HTTP service.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community
zhouzihao11/jev-dllmPython
zhouzihao11/jev-dllmPython3GitHub stars
A browser console for Jev: build Noul, Choice and Score question sets, run them against your TypeSafe key, then export the same configuration as Python, JavaScript or cURL to drop into your own project.
Jev Demos & Experiments#community#awesomejev#catalog-import
Community
YanfLIZi56/jev-starterVue
YanfLIZi56/jev-starterVue7GitHub stars
A browser driving simulator on real OpenStreetMap streets where you can take the wheel, watch Rules, jev or your own JavaScript agent choose the next move, then rewind and take the same decision differently.
Jev Demos & Experiments#community#awesomejev#catalog-import
Community
BrendanH18/jev_fsdJavaScript
BrendanH18/jev_fsdJavaScript8GitHub stars
Turns any chat model into a Jev-compatible decision service: state, question and all options go in one prefill, and the logprobs of the option labels at a single position become probabilities. Runs on SGLang, vLLM, transformers or MLX.
Jev Tools & CLIs#community#awesomejev#catalog-import
Community
tic-top/llm2jevPython
tic-top/llm2jevPython7GitHub stars
A single-page Rubik's cube playground where jev rates your scramble, then solves it one move at a time: each turn is judged from the live cube state, streamed to a 3D cube over SSE, and verified against a reference model before it animates.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
0xtrou/rubikjevTypeScript
0xtrou/rubikjevTypeScript3GitHub stars
A Node CLI, MCP server and local web app that scores document drafts against a context file and a list of questions, so an agent can rewrite against per-question scores.
Jev Tools & CLIs#community#jevbest#catalog-import
Community
a-Fig/jev-scoreJavaScript
a-Fig/jev-scoreJavaScript4GitHub stars
Four small Pydantic AI demos that put a Jev question at a fixed hook, before the model runs, before a tool runs or after the run ends, and act on the number.
Jev Integrations & Adapters#community#jevbest#catalog-import
1GitHub stars
An unofficial Go client that keeps Jev answers in your own types, so a choice over your enum yields that enum and the compiler checks the switch you write on it.
Jev Repos & SDKs#community#jevbest#catalog-import
Community
anilsenay/jevGo
anilsenay/jevGo2GitHub stars
GitHub issue triage that classifies a new issue as bug, feature, documentation, question or other, applies the matching label when thresholds pass, and asks for only the details it judged missing.
Jev Tools & CLIs#community#jevbest#catalog-import
Community
Ayush0054/metisPython
Ayush0054/metisPython6GitHub stars
A per-prompt capability router for coding agents: a local BM25 shortlist of installed skills, MCP servers, subagents and commands, then one Jev request injects at most one suggestion plus two runner-ups.
Jev Agents & MCP#community#jevbest#catalog-import
Community
bestagentkits/jev-skillfulTypeScript
bestagentkits/jev-skillfulTypeScript3GitHub stars
An MCP server built around measuring questions rather than asking them: jev_ask prototypes wording, jev_eval sweeps thresholds against labeled data, jev_map applies the winner over a workload.
Jev Agents & MCP#community#jevbest#catalog-import
Community
BYK/jev-mcpTypeScript
BYK/jev-mcpTypeScriptStart 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.