Skip to content
JevDirectory.orgTraffic count unavailable. View site traffic

The full directory

All Jev AI model resources

Entries for TypeSafe AI's flagship System One model — official docs and SDKs alongside community clients, tools, and write-ups.

Entries
3,904
Categories
11
Official
102
Community
3,802
Source sites
293
Deep dives
3,904

By format

3904
  • Docs169
  • Repos & sites3095
  • Videos74
  • Posts104
  • Articles384
  • Playgrounds78

Updated

Browse the Jev AI model by category

11 ways into the ecosystem. Each category page leads with its own shortlist of starting points.

Browse the Jev AI model by use case or industry

The same directory, sliced by what you are building and who you are building it for.

Jev use cases13 ways to put Jev to work, from classification and routing to decision gating and evaluation.
Jev industries14 sectors building with Jev, from software and security to healthcare and robotics.

All 3904 Jev AI model resources

Search the full directory, or filter by category and tag.

Showing 2689–2736 of 3904 resources

skill-router
4GitHub stars
Claude Code CLI that ranks every skill installed on your machine against a session goal using Jev, then tells the agent which one to load. Three possible answers: load this skill, nothing you have installed fits, or no skill is needed, and nothing else runs for the rest of the session.
Jev Agents & MCP#community#jevbest#catalog-import
Communitylomeshdutta/skill-routerPython
todo-jev
3GitHub stars
Python CLI that classifies a request into one of three tiers — local rule, structured decision or skill, or foundation model — using TypeSafe Jev, 20 bundled skill profiles with exclusion conditions, and local environment checks.
Jev Agents & MCP#community#jevbest#catalog-import
Communitymaker-KK/todo-jevPython
jev-workbench
3GitHub stars
Local service for authoring versioned judgment functions on TypeSafe Jev in a browser, then publishing one immutable version that both your backend calls over HTTP and your coding agents call over MCP, using a scoped client token.
Jev Agents & MCP#community#jevbest#catalog-import
Communitymolis-ai/jev-workbenchTypeScript
jev-gate
3GitHub stars
Plugin for Claude Code and native Codex that layers Jev-assisted task routing, evidence search, context compaction and readable tool output on top of the host, where typed judgments inform policy but the host keeps ownership of permissions and execution.
Jev Practices & Patterns#community#jevbest#catalog-import
CommunityMongLong0214/jev-gateTypeScript
jev-frontend-qa
7GitHub stars
Python 3.12 CLI that drives real Chrome through Browser Harness and asks Jev to pick each next browser operation and target, while scenario fixtures, deterministic assertions and fresh persistence reads decide the actual contract verdict.
Jev Demos & Experiments#community#jevbest#catalog-import
CommunityNainish-Rai/jev-frontend-qaPython
otto
4GitHub stars
Open-source Electron computer-use agent for macOS and Windows that reads the apps you select through native accessibility with local OCR added for text targets, and asks Jev to choose concrete actions that it shows you before executing.
Jev Demos & Experiments#community#jevbest#catalog-import
CommunityNobleSpartan6/ottoTypeScript
tripwire
3GitHub stars
TypeScript guardrail that puts seven Jev checks in front of an AI SDK model or an OpenAI-compatible endpoint, blocks on high-confidence hard checks, downgrades low confidence to a flag, and logs every verdict as a PII-free JSONL row you can turn into an eval set.
Jev Integrations & Adapters#community#jevbest#catalog-import
Communitynoelzappy/tripwireTypeScript
typesafe-migration-guard
2GitHub stars
Next.js service with a POST /api/migration-guard endpoint that asks Jev a SAFE or DANGER choice about a SQL statement plus target environment, returning HTTP 403 to halt a CI step or HTTP 200 to let Prisma migrations proceed against Postgres.
Jev Agents & MCP#community#jevbest#catalog-import
Communityopaielsheikh/typesafe-migration-guardTypeScript
SystemOneSharp
3GitHub stars
Unofficial .NET 10 HTTP client for TypeSafe Jev and the Jev-compatible local Laya server that posts the shared /v1/systemone body and returns typed Choice, Score and Noul answers, with no runtime package dependencies.
Jev Repos & SDKs#community#jevbest#catalog-import
Communitypinkroosterai/SystemOneSharpC#
pi-fast-jev-compaction
3GitHub stars
pi extension that never summarizes: it asks Jev whether each old tool call and tool result is still needed, then drops or truncates only those, passing text, thinking and images through verbatim in a per-request view.
Jev Agents & MCP#community#jevbest#catalog-import
CommunityQuentinDanblon/pi-fast-jev-compactionTypeScript
jevarena
2GitHub stars
Next.js spectator demo in which two independent Jev agents drive separate Snake browsers through same-origin iframes, clicking indexed direction buttons only, with each board state streamed to a server-only endpoint that returns the chosen target.
Jev Demos & Experiments#community#jevbest#catalog-import
Communityraihankhan-rk/jevarenaTypeScript
jev-system-architect
2GitHub stars
A written agent skill, not code: it walks through where a system contains fuzzy semantic judgment that should become a small Jev decision primitive, and what the deterministic code around it should keep owning.
Jev Agents & MCP#community#jevbest#catalog-import
Communitysamtay32/jev-system-architect
jev-exploration
3GitHub stars
A claim ledger for Jev that recomputes published calibration figures against their own noise floors and runs an 800-item difficulty gradient on jev-1.13.0.
Jev Practices & Patterns#community#jevbest#catalog-import
CommunitySamuelSacco/jev-explorationPython
jev-turbo
2GitHub stars
Browser-use loop where a ~200 ms Jev call picks every step, run twice over the same site and model to isolate what a site map changes.
Jev Demos & Experiments#community#jevbest#catalog-import
Communitysightmap/jev-turboGo
jevibe-check
2GitHub stars
Chrome extension that labels Bluesky posts and drafts with tone classifiers as you read or type, hiding results the model is not confident about.
Jev Tools & CLIs#community#jevbest#catalog-import
Communitysriganesh/jevibe-checkJavaScript
jev-browser
12GitHub stars
Playwright wrapper that routes natural-language operations and assertions through Jev while clicks, typing and waits stay deterministic, with verification provenance.
Jev Demos & Experiments#community#jevbest#catalog-import
Communitytontoko/jev-browserJavaScript
ailerix
2GitHub stars
Model router that never names a model: Jev classifies the task family, then a cost-per-task Pareto walk picks the cheapest frontier point clearing its quality floor.
Jev Agents & MCP#community#jevbest#catalog-import
Communitytylerjharden/ailerixTypeScript
jev-layer
7GitHub stars
MCP layer that lets an agent harness ask Jev for a bounded choice from a candidate set it already allows, while permissions and execution stay with the host.
Jev Integrations & Adapters#community#jevbest#catalog-import
Communitytypakon4/jev-layerJavaScript
jev-shield
4GitHub stars
Manifest V3 ad blocker that scores candidate feed elements with Jev's noul primitive to collapse native ads, layered over network rules and a media engine.
Jev Demos & Experiments#community#jevbest#catalog-import
Communityvmendes90/jev-shieldTypeScript
btc-jev-signal
5GitHub stars
Paper-only BTC experiment on Bybit data where code gates the market state and Jev picks a long-only spot policy or no trade, run on a Cloudflare cron.
Jev Tools & CLIs#community#jevbest#catalog-import
CommunityWebGrga/btc-jev-signalTypeScript
jev-benchmark
7GitHub stars
Two committed benchmarks of Jev: chess, deliberately outside its lane, and NPC addressee detection, squarely inside it, with raw requests and a playground.
Jev Practices & Patterns#community#jevbest#catalog-import
Communitywondertwins/jev-benchmarkPython
jev-got
2GitHub stars
Game of Thrones roleplay where a narrator model writes each scene and Jev reads it back on five questions that drive the header, music and next prompt.
Jev Demos & Experiments#community#awesomejev#catalog-import
Communityphureewat29/jev-gotTypeScript
siftr
7GitHub stars
Four read-only MCP tools that rank files, cut a file down to the relevant part and pick from long lists, measured on a frozen SWE-bench Lite split.
Jev Practices & Patterns#community#awesomejev#catalog-import
CommunityBentlybro/siftrPython
clear-head
2GitHub stars
Claude Code Stop hook that checks each factual claim in a finished answer against the tool output read during that session, blocking the turn on claims the evidence contradicts or does not support.
Jev Agents & MCP#community#awesomejev#catalog-import
CommunityVladyslavHontar/clear-headPython
JevPromptCoach
4GitHub stars
Claude Code plugin that scores your prompts against seven coding-agent habits on demand rather than on every keystroke, with a backfill so the first report covers prompts you have already written.
Jev Agents & MCP#community#awesomejev#catalog-import
CommunityCrowdLinker/JevPromptCoachTypeScript
git-jev-stage
2GitHub stars
Describe the change you want in one sentence and it classifies every diff hunk as include, exclude or mixed, prints the plan, then stages the hunks you confirm. It never writes the commit.
Jev Agents & MCP#community#awesomejev#catalog-import
Communityibrahemid/git-jev-stageTypeScript
jevprune
2GitHub stars
Filters long command output for coding agents against a task description, keeping retained lines unchanged and in order, collapsing dropped runs into markers with a saved copy you can print back later.
Jev Agents & MCP#community#awesomejev#catalog-import
Communityibrahemid/jevpruneTypeScript
jev-mode
4GitHub stars
Python library and CLI that moves bulk semantic judgments — ticket triage, stale-file tagging, bug or question routing — out of the agent's context into typed Jev questions, with a measured comparison against an in-context control.
Jev Practices & Patterns#community#awesomejev#catalog-import
Communityddfeyes/jev-modePython
pi-jev-context
2GitHub stars
Pi extension that uses Jev to judge which older session messages are still worth sending to the model, hiding low scorers from future requests while leaving the session transcript itself intact.
Jev Agents & MCP#community#awesomejev#catalog-import
Communitykevinpita/pi-jev-contextTypeScript
jev-cvss
2GitHub stars
Three Python scripts that have Jev pick CVSS metric values from a vulnerability description while the numeric scores are computed in code, following the FIRST v3.0, v3.1 and v4.0 specifications.
Jev Tools & CLIs#community#awesomejev#catalog-import
CommunityRed5d/jev-cvssPython
jev2048
2GitHub stars
A Playwright agent that lets TypeSafe's Jev decision model play a real online 2048 site, one API call and one keypress per move, printing calibrated probabilities for all four directions as it goes.
Jev Demos & Experiments#community#awesomejev#catalog-import
Communityerhanmeydan/jev2048Python
research_desk
3GitHub stars
A Jev demonstration that pulls live company profiles and headlines from yfinance and reads them into ranked, grounded, routed trade ideas, where every number in the UI is a typed answer from one request.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community0xnairb/research_deskPython
pi-fast-jev-compaction
2GitHub stars
Pi package that uses Jev to decide, call by call, which old tool results can leave model context, with a savings gate that rejects prunes too small to be worth the prompt churn and bounded excerpts from status documents.
Jev Agents & MCP#community#awesomejev#catalog-import
CommunityKamilPostrozny/pi-fast-jev-compactionTypeScript
jev-model-router
2GitHub stars
Web chat where Jev picks the LLM for each message: one Choice question over four priced tiers, then the chosen model replies through the same Vercel AI Gateway key.
Jev Agents & MCP#community#awesomejev#catalog-import
Communityaz9713/jev-model-routerJavaScript
intelliprompter
2GitHub stars
A teleprompter of talking points rather than a script: every open point is a Jev Score question, all scored in parallel against what you have said, and a point checks off once it passes a threshold.
Jev Demos & Experiments#community#awesomejev#catalog-import
Communityfinetuningsingh/intelliprompterHTML
jev-chess
2GitHub stars
TypeScript chess library where Jev resolves natural-language move intent against verified legal moves, scores sharpness, strategic theme and king risk in one call, and drives persona opponents.
Jev Practices & Patterns#community#awesomejev#catalog-import
Communityhemanth/jev-chessTypeScript
jevcumber
3GitHub stars
Cucumber-style browser tests with no step definitions: Playwright opens the page, Jev picks among the controls actually present what each Gherkin step means, and a lockfile makes reruns deterministic.
Jev Demos & Experiments#community#awesomejev#catalog-import
CommunityRubyBrewsday/jevcumberTypeScript
jev-php-sdk
2GitHub stars
Framework-agnostic PHP client for TypeSafe's System One API: send state plus typed Noul, Choice and Score questions in one call, get back probabilities, scores and confidence you can route on.
Jev Repos & SDKs#community#awesomejev#catalog-import
Communitymzainzulifqar/jev-php-sdkPHP
jev-decisions
3GitHub stars
Hermes plugin that puts an agent's plans, drafts and claimed completions up for review — plan_review, evidence_review, action_verify — plus local approval rules that make no model request.
Jev Agents & MCP#community#awesomejev#catalog-import
Communitybojansandhaus/jev-decisionsPython
jevball
4GitHub stars
A 3D football match where each of the 22 players is a separate decision-maker: the simulation generates typed move candidates locally and Jev only picks among them, returning a probability per option.
Jev Demos & Experiments#community#awesomejev#catalog-import
Communityatarikcaliskan/jevballJavaScript
actiongate-jev
2GitHub stars
A runtime authorization gateway for agent tool calls: deterministic policy plus six narrow Jev questions produce evidence, then a single-use grant bound to the exact approved action is consumed at execution.
Jev Agents & MCP#community#awesomejev#catalog-import
Communityomkarghugarkar007/actiongate-jevTypeScript
typesafe-chess
2GitHub stars
A local chess workbench for measuring Jev as a move chooser: the code enumerates legal moves with chess.js, Jev picks from them, and Stockfish grades every pick without its evaluations reaching the model.
Jev Practices & Patterns#community#awesomejev#catalog-import
CommunityDimesio/typesafe-chessJavaScript
toolgate
25GitHub stars
A calibrated tool-call firewall for coding agents: seven typed risk questions plus one question about whether the task authorized the call decide whether a Bash, Write or MCP action runs, asks, or is denied.
Jev Practices & Patterns#community#awesomejev#catalog-import
CommunityRiskAverseTech/toolgateTypeScript
jev-model-router
2GitHub stars
A Python library that routes each prompt to the cheapest OpenRouter model that can handle it: Jev classifies domain and complexity, then a deterministic scoring function ranks OpenRouter's live catalog against that classification.
Jev Agents & MCP#community#awesomejev#catalog-import
Communitylucianfialho/jev-model-routerPython
Winnow
3GitHub stars
A Chrome extension that scores articles, videos and feed links with a fixed set of typed Jev questions and turns the probabilities into a read, skim, save or skip verdict, with the thresholds in options.
Jev Demos & Experiments#community#awesomejev#catalog-import
CommunityThinkyMiner/WinnowTypeScript
jev-starter
3GitHub stars
A TypeScript starter for the layer around the model: decision contracts, confidence thresholds that route to auto, fallback or human review, deterministic mock providers, and an offline evaluation harness.
Jev Practices & Patterns#community#awesomejev#catalog-import
Communityhamakyo/jev-starterTypeScript
dgui-hypermem
2GitHub stars
A self-hosted long-term memory MCP server on Cloudflare Workers: vector and full-text candidates fuse by reciprocal rank, then a Jev layer re-ranks them and assigns each memory a type, salience and durability.
Jev Agents & MCP#community#awesomejev#catalog-import
Communityctaxnagomi/dgui-hypermemTypeScript
jev-pii-checker
3GitHub stars
A CLI that scans text and files for PII in three layers — thirteen typed category questions plus a sensitivity score, regex extraction, and Intl.Segmenter name candidates judged by Jev — with masked output and exit codes.
Jev Demos & Experiments#community#awesomejev#catalog-import
Communitycoo-quack/jev-pii-checkerTypeScript

Start here with the Jev AI model

Hand-picked entries the maintainers recommend first, from official primitives to community tools.

Jev: For the Builders AND Dreamers (Jev 1.14)
The Jev Day release post: Jev 1.14.0 under jev-preview plus three danger-zone features — composable images on both models, the box question type on 1.14 only, and opt-in 262k context.
Jev Guides & ArticlesArticle#official#release#vision
Official
Box Questions (Dreamer-Ready)
The box question type: one bounding box per question, returned as four edges that are fractions of the image, plus confidence, with no criteria field and no not-found value.
Jev Practices & PatternsDocs#official#docs#vision
Official
Jev 1.14 Day 0 Support in LiteLLM
LiteLLM's Day 0 post for TypeSafe Jev 1.14: the proxy adds box questions, image input and long-context mode on both POST /v1/systemone and POST /v1/decisions, forwarding TypeSafe-Danger-Zone headers only to TypeSafe deployments.
Jev Integrations & AdaptersArticle#community#litellm#gateway
Community

Newest Jev AI model resources

The latest additions to the directory, newest first.

From the Jev community

Watch walkthroughs, read the threads, and see what builders are posting.

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.

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 News

Reddit: 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 News

Hacker 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 News

Hacker 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 News

Hacker 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 News

Follow @typesafeai

How entries are chosen

Every entry is reviewed 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 the Jev AI model?

Jev is TypeSafe AI's first System One model — an AI model that 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. 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 reviewed, 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 3904 entries from 293 source sites, last updated Nov 5, 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. 3904 of the 3904 entries carry one today.

For the canonical details, read the official TypeSafe docs and the API reference.