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 385–432 of 625 resources
1GitHub stars
A public benchmark for the three typed decisions a land-development SaaS actually makes: JSON schemas, anonymized seed rows, and a script that scores any OpenAI-compatible model on accuracy, calibration, cost and latency.
Jev Practices & Patterns#community#jevbest#catalog-import
Community
zsavage8/padflow-jev-evalsPython
zsavage8/padflow-jev-evalsPython2GitHub stars
Three dependency-free files that put Jev in a browser agent's hot path: code builds the choices from a table of visible controls, Jev picks an operation and target in one forward pass, and the code executes the pick.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
zurfyx/jev-browser-skillJavaScript
zurfyx/jev-browser-skillJavaScript0GitHub stars
Last Exit is a short cyberpunk checkpoint game where you type a cover story, present a manifest and offer a bribe to an inspector who decides whether to let you through. Each reply makes two Jev calls: one turns your statements into typed observations, the other picks his next action.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
0x963D/last-exitJavaScript
0x963D/last-exitJavaScript2GitHub stars
Jevegis wraps Jev into a single guardrail call for LLM apps: one request covering prompt injection, jailbreaks, credential and PII leaks, unauthorized actions, malicious code and indirect injection in retrieved documents, plus Trust & Safety moderation. It returns probabilities rather than booleans.
Jev Tools & CLIs#community#jevbest#catalog-import
Community
0xArx/jevegisTypeScript
0xArx/jevegisTypeScript1GitHub stars
Jev RPS is rock-paper-scissors against TypeSafe's Jev with a commit-then-reveal protocol: the server seals Jev's move with a salted SHA-256 commitment and AES-256-GCM encryption before your buttons unlock, and the browser recomputes the hash after the reveal.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
0xlau/jev-rpsJavaScript
0xlau/jev-rpsJavaScript0GitHub stars
Tiltmeter records the probabilities Jev returns for every question your app asks and alerts when one moves: a version change behind jev-latest, drift away from baseline, too many answers sitting next to your threshold, or an estimated accuracy drop computed without labels.
Jev Integrations & Adapters#community#jevbest#catalog-import
Community
abe75ch/tiltmeterPython
abe75ch/tiltmeterPython1GitHub stars
Pong where the ball advances one segment per model decision, run as four lanes so you can watch a typed-decision model keep up with a court that structured-output chat models cannot.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
ably-labs/jev-pongTypeScript
ably-labs/jev-pongTypeScript2GitHub stars
A Python decision layer for browser and desktop automation: your code observes the surface, builds the candidate list and verifies the result, and the model only picks one id per step.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
aidil2105/jev-browser-pilotPython
aidil2105/jev-browser-pilotPython2GitHub stars
A Pi extension that catches the turn-ending "Continuing the run" reply and sends the agent back to it, gated on the latest user request actually containing a command to do work.
Jev Agents & MCP#community#jevbest#catalog-import
0GitHub stars
A short field note on playing Jev at chess: both sides keep proposing draws in positions that are far from balanced, then go on to win, with the loss probability much lower.
Jev Practices & Patterns#community#jevbest#catalog-import
1GitHub stars
An OpenAI-compatible proxy that spends one Jev call per request on injection, harm and PII checks plus a tier label, then routes to a small or large backend from pure code.
Jev Agents & MCP#community#jevbest#catalog-import
Community
aniruddh-krovvidi/switchboardPython
aniruddh-krovvidi/switchboardPython0GitHub stars
An experimental bench for writing a game ruleset and immediately watching it played: Jev is both the tool that explores the rules and the first player, one typed boolean per legal cell.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
ARCJ137442/jev-lifeTypeScript
ARCJ137442/jev-lifeTypeScript1GitHub stars
A Jev-protocol model gateway: a Rust and axum daemon turns an editable routing DAG into the actual call path, with a React console, a Tauri desktop shell and a Docker image.
Jev Integrations & Adapters#community#jevbest#catalog-import
CommunityARCJ137442/jev-switchRust
ARCJ137442/jev-switchRust0GitHub stars
A pygame-ce river shooter whose AI pilot splits the river into 20 lanes and asks Jev one parallel System One request per decision for lane, fire and speed.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
ashaazami/river-run-typesafePython
ashaazami/river-run-typesafePython1GitHub stars
An npm package that supervises a running agent: one Jev systemOne call per check returns six semantic signals about recent steps, and a deterministic policy in your own code turns them into CONTINUE, WARN, REPLAN or HALT.
Jev Agents & MCP#community#jevbest#catalog-import
Community
AshutoshVJTI/progressgateTypeScript
AshutoshVJTI/progressgateTypeScript1GitHub stars
CV review on localhost, built on TypeSafe System One (jev-latest): upload a PDF or DOCX, check the extracted text, and get whole-document judgments on work clarity, contribution, interpretability, outputs and scope, each expandable to the question, criteria, answer and probability distribution behind it.
Jev Tools & CLIs#community#jevbest#catalog-import
Community
awun8191/jev-resume-analyzerPython
awun8191/jev-resume-analyzerPython0GitHub stars
A one-commit TypeScript MCP server that exposes three TypeSafe System One judgments — noul, choice and score — as agent tools, with src, tests, docs, scripts and a knip config. No README, zero stars, no topics.
Jev Agents & MCP#community#jevbest#catalog-import
0GitHub stars
An eval that puts Jev two questions about shadcn-ui/lint: whether each finding is a real rule violation, and whether the linter's message tells you what to change. It runs the real linter over 131 rule test cases and scores both the detections and the messages.
Jev Practices & Patterns#community#jevbest#catalog-import
Community
blas0/jev-shadcn-lint-evalJavaScript
blas0/jev-shadcn-lint-evalJavaScript0GitHub stars
A native macOS push-to-talk voice orb that runs a direct Jev choice loop over the Accessibility tree: pure SwiftUI and AppKit, local Metal Whisper transcription, and Accessibility plus microphone permissions held by JevOrb.app instead of your terminal.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
bottlebrushes/jev-orbMakefile
bottlebrushes/jev-orbMakefile0GitHub stars
A Turborepo proof of concept that replays a fictional ACME support call about once per second and schedules a real TypeSafe evaluation for every new turn, coalescing turns that arrive while a request is in flight and persisting evidence, confidence and score history to SQLite.
Jev Tools & CLIs#community#jevbest#catalog-import
0GitHub stars
A two-package collection of TypeSafe System One demos: jev_common is a shim for the API that loads .env and records results, and maze_lookahead checks spatial reasoning by testing how far the model can think ahead in a maze.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
Bud-ro/jev-demosDart
Bud-ro/jev-demosDart0GitHub stars
A public X demo of TypeSafe Jev, in a repository named jev-ad-preflight. The README is one line - Typesafe/Jev public X demo - with no install steps, no description of the checks, no model choice and no recorded results.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
cardotrejos/jev-ad-preflight
cardotrejos/jev-ad-preflight1GitHub stars
A public X demo of TypeSafe Jev, in a repository named jev-should-i-apply. The README is one line - Typesafe/Jev public X demo - with no install steps, no description of the questions asked, no output format and no results.
Jev Demos & Experiments#community#jevbest#catalog-import
Communitycardotrejos/jev-should-i-apply
cardotrejos/jev-should-i-apply0GitHub stars
A public X demo of TypeSafe Jev, in a repository named jev-user-jury. The README is one line - Typesafe/Jev public X demo - with no install steps, no description of who the jury is, no questions and no results.
Jev Demos & Experiments#community#jevbest#catalog-import
Communitycardotrejos/jev-user-jury
cardotrejos/jev-user-jury0GitHub stars
A Next.js demo that sends one request of 36 independent questions to TypeSafe and renders a twelve-member council voting on your idea: each character answers approve, oppose or baffled, plus an enthusiasm score and a confusion probability.
Jev Demos & Experiments#community#jevbest#catalog-import
0GitHub stars
MCP server built on TypeSafe's official JavaScript SDK. One `ask` call batches choice, noul and score questions over a single state and returns per-option probabilities plus a separate confidence value.
Jev Agents & MCP#community#jevbest#catalog-import
Community
cbruyndoncx/AskJev-MCPJavaScript
cbruyndoncx/AskJev-MCPJavaScript0GitHub stars
Rust port of the Python system-one-adapter: a drop-in stand-in for TypeSafe's `system_one` evaluation API backed by LLM providers instead, so the same questions can be scored against an LLM on cost, speed and intelligence.
Jev Practices & Patterns#community#jevbest#catalog-import
3GitHub stars
Emoji autocomplete where every pause in typing triggers one Jev call answering eight typed questions in parallel: an emoji choice, an emotion choice, three scores and three booleans, in about 100 ms of model time.
Jev Tools & CLIs#community#jevbest#catalog-import
Community
colinmcdermott/emoji-jevTypeScript
colinmcdermott/emoji-jevTypeScript0GitHub stars
Local TypeScript library and CLI for exploratory browser testing: Jev picks actions and judges observed results while Playwright executes them in isolated sessions, with trace files, reports and replay that needs no model calls.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
CorieW/JevTestTypeScript
CorieW/JevTestTypeScript0GitHub stars
Repository navigation tool that pairs a lexical index and reference graph with small typed Jev judgments: Find narrows to candidate files, Map locates a subject's members, and Explain builds an evidence-backed graph.
Jev Tools & CLIs#community#jevbest#catalog-import
Community
cpaczek/s1sTypeScript
cpaczek/s1sTypeScript0GitHub stars
Shared 1,000 by 1,000 emoji canvas where Jev paints alongside visitors: after each stroke it picks a keyword-matching emoji and a named position relative to that stroke, and answers whether the stroke is unfinished.
Jev Tools & CLIs#community#jevbest#catalog-import
Community
cwdx/1-million-emojisTypeScript
cwdx/1-million-emojisTypeScript0GitHub stars
Local stdio MCP server that lets an agent delegate a decision: send a decision, context and 2 to 64 choices, get back a recommended choice with per-choice percentages and an explicit statement of where those percentages came from.
Jev Agents & MCP#community#jevbest#catalog-import
Community
dakdevs/decide-mcpTypeScript
dakdevs/decide-mcpTypeScript0GitHub stars
Preprint plus reproducible experiments arguing that per-hop calibration does not compose across a decision pipeline: two lemmas, a Deferred Crispification design law, a BSF-S1 reference architecture, and two weight-free audit metrics.
Jev Practices & Patterns#community#jevbest#catalog-import
0GitHub stars
n8n community node for TypeSafe's System One API, exposing yes or no, choice and score questions as workflow nodes, with an Evaluate Questions operation that batches several over one state in a single request.
Jev Integrations & Adapters#community#jevbest#catalog-import
0GitHub stars
Registry of Jev question packs as data, with YAML questions, JSONL golden cases and recorded evidence, plus an offline-reproducible benchmark scoring TypeSafe, Anthropic and a local open-weights model on identical ground truth.
Jev Agents & MCP#community#jevbest#catalog-import
Community
dtduc-git/jev-packsPython
dtduc-git/jev-packsPython0GitHub stars
Reference TypeScript integration for Jev that keeps thresholds in your code and confidence bands in the type: a decision builder, runtime response validation, a rule fallback, and an eval CLI that refuses thresholds from thin data.
Jev Tools & CLIs#community#jevbest#catalog-import
Community
Dujaydis/JevSysUnoTypeScript
Dujaydis/JevSysUnoTypeScript3GitHub stars
Experimental Minecraft Java bot driven by direct TypeSafe choices, one movement pulse, turn, aim, mine or place per decision, with the real API request and response shown beside a live third-person world view.
Jev Demos & Experiments#community#jevbest#catalog-import
0GitHub stars
A benchmark for browser-using agents hosted on Almond: one prompt, five timed events scored by the page, plus Almond-fastloop, a ~200-line Chrome DevTools loop where Jev picks one bounded action per tick.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
eriestra/browser-use-olympicsHTML
eriestra/browser-use-olympicsHTML0GitHub stars
Two studies on whether Jev can be turned into a trading signal: Nasdaq-100 headlines and price candles. Publication-day rank IC is +0.24; the window you can actually trade is flat and the long-short loses 18 bps a trade.
Jev Practices & Patterns#community#jevbest#catalog-import
Community
Gaurav-Gosain/jev-alpha-benchGo
Gaurav-Gosain/jev-alpha-benchGo0GitHub stars
Upworthy's randomized headline A/B tests, filtered to variants that shared an image: Jev picks the click winner 64.5% of the time on a held-out confirmatory split, and 74.7% when the real gap was decisive.
Jev Practices & Patterns#community#jevbest#catalog-import
CommunityGaurav-Gosain/jev-headline-benchGo
Gaurav-Gosain/jev-headline-benchGo1GitHub stars
An independent Chinese-language report auditing where Jev's headline numbers come from, plus a reproducible 50-sample Chinese evaluation: 86 of 90 judgments right, ECE 0.070, run for a fraction of a cent.
Jev Practices & Patterns#community#jevbest#catalog-import
Community
HackSing/jev-reportPython
HackSing/jev-reportPython1GitHub stars
A reference app for Jev's typed primitives: three use cases — support routing, compare-and-choose and content triage — behind one server-side SDK boundary, with a developer view of every question, threshold and token count.
Jev Tools & CLIs#community#jevbest#catalog-import
Community
haibt163/jevTypeScript
haibt163/jevTypeScript0GitHub stars
A French-language design note for a Minecraft agent: deterministic world code, an LLM strategist called at most twice a minute, and Jev picking among movement primitives each tick while a structured journal holds what neither model remembers.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
Hardel-DW/jev.modsJava
Hardel-DW/jev.modsJava1GitHub stars
A Codex plugin that asks Jev which conversation passages still matter, lets Codex compact normally, then restores the selected excerpts verbatim afterwards with labels for their original role and tool source.
Jev Agents & MCP#community#jevbest#catalog-import
Community
hatt-io/jevkeepTypeScript
hatt-io/jevkeepTypeScript0GitHub stars
A Choice-only decision framework around Jev: a local rule engine answers reject, short-circuit, route and constrain cases with no remote call, and only misses reach a Choice request on TypeSafe, Cloudflare, Vercel or a self-hosted host.
Jev Integrations & Adapters#community#jevbest#catalog-import
Community
haxitag/Yueli-DexTypeScript
haxitag/Yueli-DexTypeScript0GitHub stars
A minimal Japanese walkthrough of calling Jev through the TypeScript SDK on Bun: install, set the key, run the SDK's own sample, then extra scripts covering Noul, placeholders, parallel calls and Japanese prompts.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
heiwa4126/jev-bun1TypeScript
heiwa4126/jev-bun1TypeScript0GitHub stars
A pre-install gate for npm lifecycle scripts: pkgGate() pulls the preinstall, install and postinstall hooks from a package name, a path or a raw command, judges them with System One, and returns allow, warn or block.
Jev Tools & CLIs#community#jevbest#catalog-import
Community
hemanth/pkg-gateJavaScript
hemanth/pkg-gateJavaScript0GitHub stars
A Python linter that scores code comments with System One on five heuristics — usefulness, readability, accuracy, redundancy, coverage — and fails the pipeline when a comment falls under a threshold.
Jev Tools & CLIs#community#jevbest#catalog-import
Community
Hexdigest123/typesafe-commentPython
Hexdigest123/typesafe-commentPythonStart 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.