The Jev launch post
Diogo Almeida introduces Jev, TypeSafe’s structured decision model. Watch the launch film and explore the original thread for the model’s approach, examples and author-reported performance.
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Recent activityA FIELD GUIDE TO JEV / VOL. 01
The best of Jev. Real projects, practical guides and ideas from across the internet.
Diogo Almeida introduces Jev, TypeSafe’s structured decision model. Watch the launch film and explore the original thread for the model’s approach, examples and author-reported performance.
TypeSafe’s official launch announcement introduces the lab and points builders to Jev. It includes Diogo Almeida’s launch film and original introduction.
TypeSafe announces public access to Jev without a waiting list. The official console is the starting point for trying typed decisions in your own application.
x.comJev opens to everyoneExplore this project ↗TypeSafe highlights Jev’s typed-output approach: applications provide state and questions, then act on probabilities, choices or scores. The linked announcement also covers the Venice API integration.
x.comAnswers your code can useExplore this project ↗Four official signals. A fresh starting point on each visit.
714 resources
AI-assisted summaries and translations. Check original sources for context and performance claims.
Runtime constraints for the pi coding agent: checks every side-effecting tool call against what you said, before it runs. Powered by TypeSafe Jev.

Source-linked curation
Instinct: describe a case in free text and Jev picks the UI from a fixed catalog without generating a line of code or copy.
github.comjoevidev/ui-generator-instinct-jevExplore this project ↗Source-linked curation
Pull request adding Jev to station-suggestion reranking in the TrainLCD transit app.
github.comTrainLCD/Functions/pull/33Explore this project ↗Source-linked curation
A browser-native Doom agent experiment with structured spatial state, composable AI controls, live decision telemetry, and a Chocolate Doom WebAssembly runtime.
github.comlukaske/jev-doom-agentExplore this project ↗Source-linked curation
JevBench v1 - a benchmark for Jev-class typed decision models: smart, cheap, fast, reliable, open.
github.comfstandhartinger/jevbenchExplore this project ↗Source-linked curation
Latency-first Rust SDK for TypeSafe System One.
github.comAbdelStark/typesafe-rsExplore this project ↗Source-linked curation
Describe your startup idea. Jev decides: kill it, fix it or ship it.
github.commonteduro/killmyideaExplore this project ↗Source-linked curation
Links records under a plain-English match rule using Jev Noul pair judgments, with local candidate blocking and match resolution.
github.comkeltokhy/jlinkExplore this project ↗Source-linked curation
A developer project for model routing with caching and failover.
github.comwin4r/pi-jev-routerExplore this project ↗Source-linked curation
Using the new model JEV to play the game tetris.
github.comYasserbhb/Agent-JEV-TetrisExplore this project ↗Source-linked curation
📡 全网最全 · The world's most comprehensive tracker of the Jev (TypeSafe AI System One) ecosystem — 220+ documented cases · 108 confidence-graded entries · verified & rescanned every 3 hours · API access guide included.
github.comeveryinfra/jev-radarExplore this project ↗Source-linked curation
Typed decisions with TypeSafe's Jev, the first System One model.
github.comvalentynkit/awesome-jev-typesafeExplore this project ↗Source-linked curation
Open replica of TypeSafe's Jev: typed calibrated decisions in one forward pass, on Gemma 4 E2B / Gemma 3 270M (Modal).
github.commithalouni/system-one-openExplore this project ↗Source-linked curation
Bounded TypeSafe Jev workflows for coding agents.
github.comdevagrawal09/stanley-codeExplore this project ↗Source-linked curation
English full-duplex voice control for macOS with OpenAI Realtime, native Accessibility, and Jev.
github.combrudarko/jev-mac-voiceExplore this project ↗Source-linked curation
Typesafe.ai System One Model Jev navigating a Neo4j graph by using a classifier over neighbouring relationships.
github.comjexp/neo4jevExplore this project ↗Source-linked curation
A Jev-inspired decision interface for existing LLMs. Explicit choices, scores, calibration, and review thresholds.
github.comgrishahq/decisionbridgeExplore this project ↗Source-linked curation
Agent-first Haskell DSL for TypeSafe's Jev judgment model: typed packets, inferred types, answers under the same labels.
github.cominanna-malick/jev-dslExplore this project ↗Source-linked curation
JevNoiseGate filters unwanted notifications and SMS on Android. Rather than matching keywords, an LLM decides what's noise — and only what it explicitly flags is blocked. Verification codes are matched on-device and never uploaded; anything uncertain passes through.
github.comufec/jev-block-android-adExplore this project ↗Source-linked curation
Reward-hack radar for coding agents: structural denies + TypeSafe Jev System One sidecar for Claude Code & Cursor hooks.
github.com24601/rh-guardExplore this project ↗Source-linked curation
Six hook gates for Claude Code that catch broken rules, out-of-scope edits, unfinished asks, and false claims, each judged by Jev against a fixed checklist and one piece of evidence.
github.comrashedInt32/jev-gatesExplore this project ↗Source-linked curation
Using Typesafe.AI to generate diff reviews.
github.comrbalch/typesafeai-reviewExplore this project ↗Source-linked curation
Flue agent routing with TypeSafe Jev through Cloudflare AI Gateway.
github.commatthewp/flue-jev-demoExplore this project ↗Source-linked curation
Experimental decision protocol whose Jev adapter evaluates framed evidence with typed choices, while application code validates permissions and commits simulated demo actions.
github.comnumerous-com/dgpExplore this project ↗Source-linked curation
A small open decision model: state + typed questions -> calibrated probabilities. A Jev / System One re-creation on Qwen3.5.

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Agent Skill: send closed coding-agent judgments to TypeSafe Jev.

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A reproduction of Jev that turns any Qwen model into a fast decision model, serving the same /v1/systemone schema (Choice, Score, Noul) with no training and no generated answer text.
github.comzhengxuyu/litjevExplore this project ↗Source-linked curation
An idiomatic, type-safe Elixir port of the official TypeScript AI SDK (ai / ai-sdk) providing unified LLM integrations, streaming text and structured outputs, tool calling, and agentic workflows. Jev is their current flagship model and is the first System One model.
github.comnshkrdotcom/typesafe_sdkExplore this project ↗Source-linked curation
A developer project for agent-native routing that selects models based on task complexity.

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A developer project for the agents shelf, using MCP tool for Codex instead of listing all options.
github.comjackbarunz/jev-tool-routerExplore this project ↗Source-linked curation
Everyday Stocks Status with Jev.

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Unofficial study: Jev-style parallel typed decisions on stock 1.5B-8B models on an Apple Silicon laptop. Benchmarks, research notes, and a Hugging Face Space demo.
github.comrorshopping/jev-on-a-laptopExplore this project ↗Source-linked curation
Turn your AGENTS.md preferences into a fast, Jev-powered AI linter.
github.comdoeixd/jev-prefExplore this project ↗Source-linked curation
A GitHub Action using Jev for automated PR triage and classification.

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Independent Jev 1.13.0 behavior study: report, controlled prompt experiments, raw results, and offline verification.
github.comRINNECODER/jev-behavior-studyExplore this project ↗Source-linked curation
SQL with natural-language predicates, powered by TypeSafe's Jev. Filter, rank, classify and score rows by meaning — batched, cached and cost-guarded.
github.comEugeneBoondock/jevsqlExplore this project ↗Source-linked curation
An evaluation of typesafe AI chess. As it turns out, the AI isn't doing really well even though chess is not a particularly open-ended game. Still, it's only a prototype and this probably wasn't optimzied for games.
github.comAliceRoselia/Typesafe_chess_evalExplore this project ↗Source-linked curation
A GitHub project implements a web search tool where Jev selects sources for plain-language queries.
github.commukiwu/jev-search-mcpExplore this project ↗Source-linked curation
A SillyTavern extension that evaluates replies before they are displayed, collected for the creative shelf.
github.commossyfield/ST-jevedExplore this project ↗Source-linked curation
Jev-augmented Playwright MCP proxy — page-state triage, prompt-injection shielding, goal-based snapshot pruning, risky-action gating. Drop-in wrapper around @playwright/mcp for any coding agent.
github.comkrw82/jev-playwright-mcpExplore this project ↗Source-linked curation
An optimized inference engine to turn LLMs into Jev-like machines: optimized for quick, lightweight, and accurate decision-making, classification, and scoring.
github.comMintzs/jevifyExplore this project ↗Source-linked curation
A developer project integrating Home Assistant with Jev for processing user input without an LLM.
github.comallenporter/home-assistant-typesafeExplore this project ↗Source-linked curation
Hunch is a GitHub tool for code review that applies rules written in plain English to analyze and improve code quality.

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22 Jev models, one ball: a 3D football match where every player is its own Jev (TypeSafe AI System One) decision. Watch, or take over the number 9.
github.comatarikcaliskan/jevballExplore this project ↗Source-linked curation
HireSignal — resume first-pass fit+interview via TypeSafe Jev.
github.comndolinschi/hiresignalExplore this project ↗Source-linked curation
Calibrated alignment verifier for LLM responses and agent plans — powered by Jev.
github.comcaiovicentino/jev-alignExplore this project ↗Source-linked curation
Openvons (open-Jev): 有限選択肢に確率で答える判断層 — テキスト / 画像 / 日本語音声コマンド.
github.comgenai-craft/openvonsExplore this project ↗Source-linked curation
Retrieve by relevance, not resemblance: filter an AI assistant's memories with TypeSafe's Jev.
github.comsamdotmak/jev-recallExplore this project ↗Source-linked curation
Twelve members. Zero qualifications. A playful TypeSafe AI council with animated votes, inspectable decisions, and shareable verdicts.
github.comcbetz/extremely-specific-councilExplore this project ↗Source-linked curation
A Chrome extension that organizes bookmarks using user-defined rules for categorization.

Source-linked curation
DiffJury — TypeSafe Jev PR risk router + code review coach.
github.comraihankhan-rk/diffjuryExplore this project ↗Source-linked curation
Use Jev (TypeSafe's System One model) as a calibrated reranker: one call, up to 30 documents, a probability per document. Apache-2.0.
github.comhev/rerankerExplore this project ↗Source-linked curation
A GitHub project enabling voice-controlled Mac automation without vision models.
github.comsavka777/jev-useExplore this project ↗Source-linked curation
Challenge the Jev's intelligence in Rubik Cube puzzles.
github.com0xtrou/rubikjevExplore this project ↗Source-linked curation
A GitHub project for a Pareto-optimal OpenRouter router for Pi, decided by Jev.
github.comphilippdubach/pi-jev-routerExplore this project ↗Source-linked curation
Jev scores collapsed log batches; code maps answers to suppress, watch, review, notify, or page. Nothing is executed.
github.comjyatesdotdev/jev-logtriageExplore this project ↗Source-linked curation
TrustGate — indie media T&S gate via TypeSafe Jev.
github.comndolinschi/trustgateExplore this project ↗Source-linked curation
Automated database migration safety reviewer powered by TypeSafe AI (Jev System One model).
github.comopaielsheikh/typesafe-migration-guardExplore this project ↗Source-linked curation
Selects source-linked evidence within a token budget using Jev Noul relevance judgments and local diversity-aware selection.
github.comkeltokhy/jselectExplore this project ↗Source-linked curation
A tool controlling Ableton Live with concise commands, leveraging Jev's decision-making capabilities.
github.comokinaaudio/live-jevExplore this project ↗Source-linked curation
One-pass option scoring with a local Gemma 3 4B on Apple silicon via MLX, inspired by jevlike, with a Doom demo.
github.comdaseinlabs/open-jevExplore this project ↗Source-linked curation
Grep by meaning, across languages. TypeSafe Jev scores every line against a meaning; combine meanings with AND/OR/NOT. 意味で探す grep。日本語で英語を、英語で日本語を検索できる.
github.comuehaj/jev-semgrepExplore this project ↗Source-linked curation
Jev plays browser table tennis in real time: structured telemetry, typed decisions, ordinary Chrome inputs, and auditable evidence.
github.comIcohen007/jev-play-ping-pongExplore this project ↗Source-linked curation
A developer project offering 110 interactive use cases, games, and scenarios with editable prompts.

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A developer project offering semantic code search for coding agents, benchmarked on SWE-bench Lite.

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Скилл для агентов Letta: суждения по критериям через TypeSafe System One (Jev).
github.comcarlsonchik/judging-with-typesafeExplore this project ↗Source-linked curation
Open-source AI email triage for Gmail. Sorts your inbox into Needs reply, Updates, Promos, Sales and Spam with Jev, TypeSafe AI's decision model, via Vercel AI Gateway. Read-only, runs locally, 1,000 emails in about a minute for 3 cents.
github.comfazlerocks/jevmailExplore this project ↗Source-linked curation
JEV-inspired parallel decisions for CUDA LLMs. One context, many decisions. vLLM API, game-agent examples, and reproducible benchmarks.
github.comkikoncuo/jevfireExplore this project ↗Source-linked curation
Chrome extension that re-ranks Google results with TypeSafe Jev and folds away sales pages and SEO filler.
github.comtylergibbs1/siftExplore this project ↗Source-linked curation
Per-prompt capability router for coding agents: resolves installed skills, MCP servers, agents and commands against your prompt via TypeSafe Jev, and measures whether the injection actually helps.
github.combestagentkits/jev-skillfulExplore this project ↗Source-linked curation
Can a System One model steer music? Jev picks the plan (enums only); code renders sheet, audio and MIDI.

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ACP and MCP adapter that bridges TypeSafe Jev with any LLM — computer use and typed decisions alongside Codex, Claude, Grok, and OpenCode.
github.comtacticocc/JevbridgeExplore this project ↗Source-linked curation