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 954 resources
5GitHub stars
Zero-dependency Node bridge that exposes Jev through OpenAI-style chat and responses endpoints with streaming, plus a CLI, a code-audit tool, and an auto-fix loop.
Jev Repos & SDKs#community#awesomejev#catalog-import
4GitHub stars
.NET client for System One where you declare choice, score, and yes-or-no questions in C# and get typed answers with probabilities and confidence back, installable as one NuGet package.
Jev Repos & SDKs#community#awesomejev#catalog-import
Community
JabbaKadabra/SystemOneDotNetC#
JabbaKadabra/SystemOneDotNetC#5GitHub stars
Local workspace that turns software requests into scored Codex tickets, routing each by complexity to a configured model and reasoning effort with Git state, checks, and recovery visible.
Jev Agents & MCP#community#awesomejev#catalog-import
4GitHub stars
Automatic Pi extension that clears safely superseded reads and test runs outright and asks Jev about other large older tool outputs, replacing them with retrievable markers.
Jev Agents & MCP#community#awesomejev#catalog-import
4GitHub stars
Browser chess lab where Jev picks from legal moves as one choice question per turn, alongside LLMs and local open models, with Swiss tournaments, live cost tracking, and in-browser Stockfish analysis.
Jev Demos & Experiments#community#awesomejev#catalog-import
Community
dperezcabrera/system-one-chessPython
dperezcabrera/system-one-chessPython3GitHub stars
Persistent multiplayer RPG concept where Jev makes in-world decisions, a background authoring thread builds the world, and code owns rules and state behind a WebGL terrain client.
Jev Demos & Experiments#community#awesomejev#catalog-import
Community
lmvdz/rpg-jevTypeScript
lmvdz/rpg-jevTypeScript3GitHub stars
Small Go triage tool that sends each message plus three questions to Jev in one request, then prints an urgency-sorted table, a low-confidence review list, and an HTML report.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
boldbug1/jev-triageGo
boldbug1/jev-triageGo9GitHub stars
Native Go runtime for Gemma 4 12B finite-choice decisions, ordered scores and yes/no probabilities, with an NVIDIA path that loads hand-tuned PTX kernels without CGo or CUDA toolkit.
Jev Tools & CLIs#community#awesomejev#catalog-import
Community
rcarmo/go-system-oneGo
rcarmo/go-system-oneGo5GitHub stars
Databricks App that sends each chat message to TypeSafe Jev choice routing, then runs inference on the winning Databricks FMAPI endpoint with confidence and per-option probabilities shown.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
rmosleydb/jev-smart-routerPython
rmosleydb/jev-smart-routerPython4GitHub stars
Coding agent that pairs explicit SQLite-typed context chunks with a small TypeSafe judgment model, so the large generation model only sees selected context.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community
arczhi/jetPython
arczhi/jetPython3GitHub stars
Evidence-driven Slay the Spire 2 agent study that handles rules and risk in code, uses cheap Jev for bulk choices, and reserves Astra for uncertain key positions with full traces.
Jev Tools & CLIs#community#awesomejev#catalog-import
Community
yzxoi/RSI-Jev-Slay-the-Spire-2Python
yzxoi/RSI-Jev-Slay-the-Spire-2Python5GitHub stars
Coding agent on Pi that pairs any OpenRouter LLM with TypeSafe Jev reflex checks on tool calls, turns and transcripts, where code thresholds decide allow, ask or block.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
kaustav1996/reflexTypeScript
kaustav1996/reflexTypeScript4GitHub stars
OpenClaw plugin adding a jev_route tool that classifies task type, complexity and risk with TypeSafe Jev, then maps the result to a route through testable JavaScript policy.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
trietphan/jev-clawJavaScript
trietphan/jev-clawJavaScript3GitHub stars
Reproducible benchmark asking whether Jev reads multi-clause rubrics, comparing Jev, Claude Haiku 4.5, Sonnet 5 and OpenJev across ten suites with corpora and spend published.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community
YidiDev/jev-benchmarkPython
YidiDev/jev-benchmarkPython4GitHub stars
Memory admission evaluator that asks Jev three typed Choice questions on support, durability and commitment, then applies a versioned policy to recommend save, skip or defer.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community
Cairn-ink/cairn-jev-labJavaScript
Cairn-ink/cairn-jev-labJavaScript3GitHub stars
C++20 SDK for TypeSafe AI that configures clients via Builder and types Choice, Score and Noul questions so answers arrive as fields, targeting System One models like Jev.
Jev Repos & SDKs#community#awesomejev#catalog-import
Community
pewriebontal/typesafe-sdk-cppC++
pewriebontal/typesafe-sdk-cppC++3GitHub stars
Mock carrier support agent with the guardrail layer built twice behind one interface: chat-model JSON judging versus TypeSafe Jev typed questions over the same 25 rules.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community
deepansh-saxena/jev-guardrailsPython
deepansh-saxena/jev-guardrailsPython6GitHub stars
Python helper that wraps TypeSafe Jev for agent arbitration, pre-execution guard, stuck-loop checks, fact verification and intent routing with probabilities and confidence.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
h0j5bz0adh0-stack/jev-pilotPython
h0j5bz0adh0-stack/jev-pilotPython3GitHub stars
Selenium player for 2048.org that reads the exact board state, runs time-bounded expectimax over the 90% 2 / 10% 4 spawn distribution, and fuses it with one Jev Choice per move.
Jev Demos & Experiments#community#awesomejev#catalog-import
Community
AMMIROSOH/jev-2048-seleniumPython
AMMIROSOH/jev-2048-seleniumPython60GitHub stars
Local System One decision models in 1.7B, 4B and 8B sizes that answer choice, yes/no and score questions over the POST /v1/systemone shape, with no text generation and no API key.
Jev Demos & Experiments#community#awesomejev#catalog-import
Community
alanhuangyoo/wevPython
alanhuangyoo/wevPython5GitHub stars
Chrome and Edge Manifest V3 extension that takes over a running browser real-time strategy game, with Jev cloud, a locally served Laya model, or any OpenAI-compatible endpoint as the decision source.
Jev Tools & CLIs#community#awesomejev#catalog-import
Community
ra2web/jev-helperJavaScript
ra2web/jev-helperJavaScript19GitHub stars
Reference framework for Jev-driven computer use where a task adapter proposes legal action candidates, Jev picks one action and its execution route, and code guards, executes and verifies the result.
Jev Demos & Experiments#community#awesomejev#catalog-import
Community
ZJU-REAL/CUA-JEVPython
ZJU-REAL/CUA-JEVPython3GitHub stars
Next.js and TypeScript research prototype that reads whole novels with an eight-emotion JEV scoring layer and a character minimap, built for inspecting model output rather than measuring it.
Jev Demos & Experiments#community#awesomejev#catalog-import
Community
carlaiau/read-with-jevTypeScript
carlaiau/read-with-jevTypeScript3GitHub stars
A pi extension that picks the thinking level for each task, escalating on reasoning-type failures and stepping back down after sustained stability, using Jev choice with local rules as fallback.
Jev Agents & MCP#community#awesomejev#catalog-import
7GitHub stars
Open-source System One scorer built on Gemma 3 270M with LoRA, where each option is scored in one batched forward pass and softmaxed into probabilities for choice, yes/no and ordered-scale questions.
Jev Practices & Patterns#community#jevbest#catalog-import
Community
akash-kamat/system-one-gemmaPython
akash-kamat/system-one-gemmaPython3GitHub stars
Autonomous Clash Royale agent on macOS through the native iPhone Mirroring app, with local deterministic pixel perception and Jev choosing between candidate plays that code has already scored.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
Amrit-Nigam/jev-royalTypeScript
Amrit-Nigam/jev-royalTypeScript2GitHub stars
Shadow-mode validation of a pre-execution firewall that batches five typed Jev hazard questions plus a blast-radius score into one call, leaving ALLOW, APPROVE and BLOCK to auditable Python.
Jev Agents & MCP#community#jevbest#catalog-import
5GitHub stars
A Claude Code function hook that sends AskUserQuestion dialogs to Jev and draws a probability per option above the dialog, so you still choose while seeing how confident the model is.
Jev Agents & MCP#community#jevbest#catalog-import
Community
BeLazy167/typesafe-modTypeScript
BeLazy167/typesafe-modTypeScript30GitHub stars
Chat client over jev-latest, which cannot generate text: the transcript becomes the state and each step is a choice over a 20,000-word dictionary, so replies are built one word at a time.
Jev Practices & Patterns#community#jevbest#catalog-import
Community
Bewinxed/jevgptTypeScript
Bewinxed/jevgptTypeScript4GitHub stars
Browser-use layer for CLI coding agents: Jev picks the operation and target element in one round trip per step, exposed over MCP with a CLI, a Python API and an HTTP server.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
brnyxx/jev-raPython
brnyxx/jev-raPython2GitHub stars
Writing evaluator that runs seven separate typed Jev checks, covering hedging, em dashes, clarity, filler phrases, tone, passive voice and actionability, and shows each verdict with its supporting sentence.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
BunsDev/clarity-judgeTypeScript
BunsDev/clarity-judgeTypeScript7GitHub stars
Unofficial community component workspace for TypeSafe AI projects: a Turborepo and pnpm monorepo with a Next.js component browser, shiki-highlighted source previews and an interactive Lab, built on shadcn base-nova, Base UI primitives, Tailwind v4 and RTL-aware components.
Jev Integrations & Adapters#community#jevbest#catalog-import
CommunityBunsDev/typesafe-uiTypeScript
BunsDev/typesafe-uiTypeScript3GitHub stars
Proxy that sits between any MCP client and any stdio MCP server and screens tool calls, tool results and tool descriptions with Jev probabilities, layering deterministic allowlists, semantic checks and session taint tracking over a JSONL audit trail.
Jev Agents & MCP#community#jevbest#catalog-import
Community
caiovicentino/jev-shieldJavaScript
caiovicentino/jev-shieldJavaScript5GitHub stars
Local-first app that extracts document text on the machine and files it into configured category folders using typed Jev decisions for category, confidentiality, prompt-injection risk and subject, with a per-run audit that previews and undoes every move.
Jev Tools & CLIs#community#jevbest#catalog-import
7GitHub stars
One-file Mastra input processor that screens the last user message with Jev instead of an LLM verdict: a typed yes/no gate plus a log-only category label, in a single request that fails open behind a circuit breaker.
Jev Agents & MCP#community#jevbest#catalog-import
3GitHub stars
Unofficial Rust client for the TypeSafe AI System One API, matching the Python SDK 0.6.0 contract: named noul, choice and score questions, a typestated builder, per-call overrides, and a `wire` module for serving the same shape.
Jev Repos & SDKs#community#jevbest#catalog-import
1GitHub stars
Unofficial, independently maintained Go client for the TypeSafe AI System One API with no third-party dependencies: choice, score and noul questions, typed accessors that error instead of returning zero, and per-call timeout, retry and header overrides.
Jev Repos & SDKs#community#jevbest#catalog-import
Community
cole-gillespie/typesafe-goGo
cole-gillespie/typesafe-goGo5GitHub stars
React library on npm where Jev judgments choose presentation: `Branch` picks a subtree, `Rank` orders or truncates a candidate set, `Gate` shows an affordance, and `useScore` returns a number you can use as an ordinary prop.
Jev Integrations & Adapters#community#jevbest#catalog-import
Community
etweisberg/jev-uiTypeScript
etweisberg/jev-uiTypeScript3GitHub stars
Task plugin that puts TypeSafe's System One endpoint behind a QuantumNous/new-api channel, so clients keep posting `/v1/systemone` while new-api handles auth, routing, model mapping and token billing against either TypeSafe or the Vercel AI Gateway.
Jev Integrations & Adapters#community#jevbest#catalog-import
2GitHub stars
Community Go client for the TypeSafe AI System One API covering the same surface as the official Python and TypeScript SDKs, using functional options, context cancellation, sentinel errors, `log/slog`, no dependencies outside the standard library, and optional Langfuse tracing.
Jev Repos & SDKs#community#jevbest#catalog-import
Community
fgn/jevgoGo
fgn/jevgoGo3GitHub stars
Go MCP server exposing Jev through OpenRouter or TypeSafe as five tools: decide, classify, verify, rerank and list_models. Each tool call is one paid inference request, answers are validated against the question asked, and the unchanged provider response is returned with its usage cost.
Jev Agents & MCP#community#jevbest#catalog-import
Community
freepik-company/jev-mcpGo
freepik-company/jev-mcpGo2GitHub stars
Agent skill that pushes a coding agent to try Jev before it writes another regex or prompt, then writes down what happened. Four reference files, an eval set of 20 trigger prompts, and three stdlib Python scripts for running questions, scoring agreement against labels you already have, and keeping a decision lab.
Jev Agents & MCP#community#jevbest#catalog-import
Community
harrymunro/decision-firstPython
harrymunro/decision-firstPython5GitHub stars
Python terminal app that puts Jev on both sides of an OpenAI answer. A LangGraph pipeline asks Jev for response mode, clarification and depth, has OpenAI draft, then has Jev score whether the draft answers the question and whether it carries unsupported claims before approving or sending it back.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
haseeb-heaven/jev-system-onePython
haseeb-heaven/jev-system-onePython3GitHub stars
Cloudflare Pages site that asks Jev every ten minutes whether AI should kill humanity, from a state built out of live headlines, and shows the typed answers next to the exact request payload. The same ruling is served as JSON from /api/verdict, and the standing answer is held in KV rather than recomputed.
Jev Demos & Experiments#community#jevbest#catalog-import
3GitHub stars
Model router that asks Jev eleven questions in one call and lets a YAML policy turn the answers into a tier. Every request starts on the fast tier and only escalates on evidence such as multi-step reasoning, hard difficulty, high stakes or safety, and every decision is logged without the message text.
Jev Agents & MCP#community#jevbest#catalog-import
Community
iamvatsalpatel/tiershiftTypeScript
iamvatsalpatel/tiershiftTypeScript2GitHub stars
Rust client that lets Jev choose the model and privacy tier for NEAR AI Cloud calls. A client-controlled monthly cap in cents is combined with Jev scores for complexity and sensitivity and nouls for private TEE, risk and urgency, then the NEAR catalog is filtered to what survives that choice.
Jev Agents & MCP#community#jevbest#catalog-import
Community
iJ03l/jearRust
iJ03l/jearRust7GitHub stars
Two TypeScript monorepo products that keep the rules in the engine and ask Jev exactly one question: what should this person or this shogi side do next. Hundred runs a hundred NPCs with hunger, money, jobs, relationships and memories; Jev Shogi picks Gote's reply from engine-legal USI moves.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
jammaru/jev-labTypeScript
jammaru/jev-labTypeScript12GitHub stars
Backtest harness that asks Jev for a BUY, SELL or HOLD call every 15 seconds on NQ L10 order-book data and trades one contract against hold, random and imbalance baselines. Runs cost money; replays of stored answers under new settings are free, and a local web app replays any mix of runs live.
Jev Practices & Patterns#community#jevbest#catalog-import
Community
justinhe16/trade-jevPython
justinhe16/trade-jevPythonStart 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.