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 673–720 of 954 resources
1GitHub stars
omp plugin that runs Jev batteries over tool results, assistant messages and turn ends, gathers deterministic git evidence before each judgment, and can score stale tool output out of later model requests.
Jev Agents & MCP#community#jevbest#catalog-import
Community
siddicky/omp-typesafeTypeScript
siddicky/omp-typesafeTypeScript2GitHub stars
Unofficial catalog of public projects that use Jev, grouped by what each project does with the answer, with every entry labelled code-inspected or demo-inspected and the counts backed by a JSON catalog.
Jev Guides & Articles#community#jevbest#catalog-import
Community
sontakey/awesome-jevPython
sontakey/awesome-jevPython4GitHub stars
Python library that maps Jev's Choice, Score and Noul onto verbs like classify, score, check, where, extract, verify and rank, keeping data shape in and out, batching one request per distinct row and caching answers.
Jev Integrations & Adapters#community#jevbest#catalog-import
Community
steven-shoemaker/hunchPython
steven-shoemaker/hunchPython2GitHub stars
TypeScript build of hunch for Node 20 and up, mapping Jev's Choice, Score and Noul onto classify, score, check, where, extract, verify, rank and route over arrays and row objects.
Jev Integrations & Adapters#community#jevbest#catalog-import
Communitysteven-shoemaker/hunch-jsTypeScript
steven-shoemaker/hunch-jsTypeScript7GitHub stars
A local MCP server that gives Codex a few cited excerpts instead of a whole noisy search result, with a deterministic default selector that needs no Jev account or key.
Jev Agents & MCP#community#jevbest#catalog-import
Community
suenot/codex-jev-routerJavaScript
suenot/codex-jev-routerJavaScript4GitHub stars
A research agent where GPT picks what to look for and Jev judges many document regions in one call, so the code can hand back verbatim passages for verification.
Jev Agents & MCP#community#jevbest#catalog-import
Community
sunyasheng/JevDeepResearchTypeScript
sunyasheng/JevDeepResearchTypeScript1GitHub stars
A small Next.js demo that sends the same input to GPT and Jev side by side, showing generative text next to three fixed Noul probabilities.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
TanayPadar/gpt-vs-jevTypeScript
TanayPadar/gpt-vs-jevTypeScript2GitHub stars
A directory of projects actually shipped with Jev, filtered by what each one replaces, whether it was benchmarked, and whether there is code to copy.
Jev Guides & Articles#community#jevbest#catalog-import
Community
theSekyi/jevusecasesTypeScript
theSekyi/jevusecasesTypeScript2GitHub stars
Runs Jev as an LLM router over two public benchmarks, with a no-Jev ablation and RouterArena's own scorer so the numbers sit next to the public leaderboard.
Jev Practices & Patterns#community#jevbest#catalog-import
1GitHub stars
A decision board that sends one System One request describing eleven stream ideas, then lets code gate and weight Jev's answers into a single pick for what to build next.
Jev Demos & Experiments#community#jevbest#catalog-import
1GitHub stars
An unofficial Elixir SDK for TypeSafe's System One endpoint, built on Req and Finch, with per-call retry policies, a shared connection pool and status-mapped errors.
Jev Repos & SDKs#community#jevbest#catalog-import
Community
vinnie357/typesafe_sdk_exElixir
vinnie357/typesafe_sdk_exElixir3GitHub stars
A gomoku lab that runs nine 15x15 games at once with two Jev players, holding the rules fixed while you vary how much tactical detail reaches the model.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
XieChengYuan/jev-gomokuJavaScript
XieChengYuan/jev-gomokuJavaScript1GitHub stars
A DeepSeek Harness plugin that exposes System One decisions as agent tools and adds an opt-in auto-guard, with a labeled benchmark it re-runs against the live API.
Jev Agents & MCP#community#jevbest#catalog-import
Community
xienda/dsh-jev-verifyJavaScript
xienda/dsh-jev-verifyJavaScript1GitHub stars
A Python layer over a small decision-provider contract that adds validated distributions, batching, budgets, ranking and exportable records, with Jev as the first provider.
Jev Repos & SDKs#community#jevbest#catalog-import
Community
yairshy/decidoPython
yairshy/decidoPython2GitHub stars
A Chrome extension that runs title and abstract screening for systematic reviews inside a shared Google Sheets project, with Jev offered beside Gemini and OpenRouter as the judging model.
Jev Tools & CLIs#community#jevbest#catalog-import
Community
youkiti/tiab-review-pluginTypeScript
youkiti/tiab-review-pluginTypeScript1GitHub stars
A Pi extension that sends each new unit of work to a Jev client as a paid classification request and routes it to one of four configured Pi models, failing open to your baseline.
Jev Agents & MCP#community#jevbest#catalog-import
Community
Z761293629/pi-jev-helmTypeScript
Z761293629/pi-jev-helmTypeScript1GitHub stars
A single self-contained Python script around AlexWortega/openjev, a Qwen3.5-4B cross-encoder that answers contradiction, entailment or neutral, exposing pair classification, multiple-choice rerank, a library API and a CLI.
Jev Practices & Patterns#community#jevbest#catalog-import
Community
zefir1990/openjev-experimentsPython
zefir1990/openjev-experimentsPython3GitHub stars
An unofficial, dependency-free Go client for the TypeSafe v1 API: System One calls built from Noul, Choice and Score questions, per-request model overrides, typed answers with a request ID, and retries that honor Retry-After.
Jev Repos & SDKs#community#jevbest#catalog-import
Community
zhirschtritt/typesafe-goGo
zhirschtritt/typesafe-goGo1GitHub 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-skillJavaScript2GitHub stars
An MCP server with two tools for agent memory: record writes facts into a per-project ledger as they happen, and recall scores each one against the task you are starting and hands back only what matters.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community
Dharundp6/jev-carryforwardTypeScript
Dharundp6/jev-carryforwardTypeScript1GitHub stars
The public contribution surface for modelsystem.one, a curated catalog of System One decision models: systems returning typed choice, score or boolean answers with calibrated probabilities instead of chat text. The site code is private.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community
fabricioctelles/modelsystem
fabricioctelles/modelsystem1GitHub stars
A Vercel-hosted comparison of TypeSafe (Jev) against DeepSeek-flash on speed, tokens, cost and accuracy, backed by per-task Python pipelines, fixture generators and a report script. Eighteen commits, nine issues still open.
Jev Practices & Patterns#community#awesomejev#catalog-import
2GitHub stars
A Node CLI that reads a folder of Word, Excel, PowerPoint, PDF, email, CSV, HTML, code and text files, classifies each with Jev on OpenRouter, and writes a catalog, an INDEX.md and an offline report. Originals are never moved.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
nexibeo/jev-organizeJavaScript
nexibeo/jev-organizeJavaScript1GitHub stars
An open Apache-2.0 2B non-autoregressive decision model for agent action routing on a Qwen3.5-2B backbone: one forward pass over a candidate set with a pointer head and an escalation head, shipped as BF16, FP8 and INT8 weights.
Jev Demos & Experiments#community#awesomejev#catalog-import
Community
mkeco/Cerebellum-2BPython
mkeco/Cerebellum-2BPython1GitHub stars
Single-file browser testbed that sends state plus boolean, choice and score questions to Jev through the Vercel AI Gateway and shows answers, probabilities, latency, token counts and estimated cost for every run.
Jev Demos & Experiments#community#awesomejev#catalog-import
Community
terryds/jevplaygroundHTML
terryds/jevplaygroundHTML1GitHub stars
Instruction corpus compiled from TypeSafe's public Jev documentation: 119 rows split across the Choice, Noul and Score primitives, with the captured source files, a standard-library Python builder and a published HuggingFace dataset.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
ctaxnagomi/instruct-jevPython
ctaxnagomi/instruct-jevPython2GitHub stars
Plugin for Claude Code, the Claude desktop app and Codex that has Jev read the task, then ranks live OpenRouter models by benchmark quality, price, speed and reasoning effort, returning a pick plus cheaper and faster alternatives with the exact command to switch.
Jev Agents & MCP#community#awesomejev#catalog-import
2GitHub stars
Consensus kernel that wraps Jev as a probabilistic oracle: five paraphrased questions, a stability gate set from the measured noise floor and a 3-of-5 quorum, with TLA+ specs, an AsyncAPI contract and Rust tests generated and gated from them.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community
copyleftdev/jev-labsPython
copyleftdev/jev-labsPython2GitHub stars
PreToolUse hook for Claude Code and Codex that puts a shell-aware rules engine and Jev in front of every tool call, returning allow, ask or block per command and logging the reason and latency behind each decision.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
Koushik890/jev-firewallTypeScript
Koushik890/jev-firewallTypeScript2GitHub stars
Chrome extension that puts a Magic 8 Ball on GitHub pull requests: nine signals from the GitHub API go to a small server, Jev picks one of four verdicts, and the ball answers with a phrase plus its reasoning. It never approves, comments or reads code.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
acharyaanusha/magic-jevTypeScript
acharyaanusha/magic-jevTypeScript1GitHub stars
Neovim popup that reads the verdict jev-lens writes after a Claude Code edit and tells you whether to open a diff, which files matter and why, with a strip-debris action, lazydiff on a key, and no API calls of its own.
Jev Integrations & Adapters#community#awesomejev#catalog-import
Community
rashedInt32/jev-lens.nvimLua
rashedInt32/jev-lens.nvimLua1GitHub stars
Community Go client for the TypeSafe API: context-aware SystemOne calls, Choice, Noul and Score constructors, scoped functional options, typed errors carrying RFC 6901 field paths, and standard-library-only runtime code. Requires Go 1.24.
Jev Repos & SDKs#community#awesomejev#catalog-import
Community
unimtx/typesafe-sdk-goGo
unimtx/typesafe-sdk-goGo1GitHub stars
Fork of OpenPoke that replaces three yes/no LLM calls with batched Jev questions: important-email screening, a tool-call guardrail for the execution agents, and a relevance re-check on search results, with the old classifier left as the fallback.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community
0xShin0221/openpoke-meets-jevPython
0xShin0221/openpoke-meets-jevPython1GitHub stars
Chinese-first Astro documentation site for Jev, covering the Choice, Noul and Score primitives plus intent routing, confidence routing, composite scoring and fan-out patterns, with an eight-language build and a cron pipeline where Jev gates each release.
Jev Demos & Experiments#community#awesomejev#catalog-import
Community
miounet11/jevcodeTypeScript
miounet11/jevcodeTypeScript1GitHub stars
Chicago traffic simulator where Jev sets citywide signal policy and two deterministic baselines replay the identical scenario: one car crosses the city while Fixed and Adaptive run headlessly against the same spawn list, seed and incident script.
Jev Demos & Experiments#community#awesomejev#catalog-import
Community
skcache/jevtrafficsimTypeScript
skcache/jevtrafficsimTypeScript1GitHub stars
Independent research repository on Jev: sourced findings that separate verified claims from vendor marketing repeated by others, a rubric-scored catalog of public Jev repositories, and recurring design patterns with evidence.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community
g0runmezadam/what-is-jevPython
g0runmezadam/what-is-jevPython1GitHub stars
WebGL demo of the card game Speed against a Jev-driven CPU, built to make decision latency and accuracy visible: every candidate move checked as a noul in one parallel request, a mechanical rule validator as referee, and p50/p95 latency panels.
Jev Demos & Experiments#community#awesomejev#catalog-import
4GitHub stars
TypeScript router that spends one Jev call deciding how an agent turn should run — model tier, effort budget, which tools are on offer and which skill applies — then your own harness runs the turn on whatever provider it already talks to.
Jev Repos & SDKs#community#awesomejev#catalog-import
3GitHub stars
Agent Skill that sends large tool output and CI logs to Jev and hands your expensive model only the few lines that matter, shipped with a stdlib-only caller, a doctor command, and a plan mode that keeps open-ended work on your LLM.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
lazniak/jevskillPython
lazniak/jevskillPython1GitHub stars
Unofficial Ruby client for TypeSafe AI: typed noul, choice and score answers, retries with jitter and Retry-After handling, per-call timeouts, a structured error hierarchy, and request-shape validation before anything goes over the wire.
Jev Repos & SDKs#community#awesomejev#catalog-import
Community
afurm/typesafe-sdk-rubyRuby
afurm/typesafe-sdk-rubyRuby1GitHub stars
Runnable benchmark putting Jev, jev-preview and Claude Sonnet 5 through one real agent task — classifying a tool call as readonly, destructive, privileged or exfiltration — on the same 60 labelled cases, with raw per-call results committed.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community
themsquared/jev-benchmarkPython
themsquared/jev-benchmarkPython1GitHub stars
Go client for the TypeSafe API with typed question and answer types, per-request model and timeout overrides, request-body passthrough for fields the SDK does not model, and slog diagnostics that exclude bodies and credentials.
Jev Repos & SDKs#community#awesomejev#catalog-import
Community
dwisiswant0/typesafe-sdk-goGo
dwisiswant0/typesafe-sdk-goGo1GitHub stars
Archived Go proxy that sat between a coding-agent CLI and the upstream API to rewrite tool schemas and history with Jev, kept for the negative result: tool steering cut tokens on one model and added 37% and 51% on two others.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
nekowasabi/jev-routingGo
nekowasabi/jev-routingGo1GitHub stars
Six browser demos of Jev's three primitives, each running the same judgment past Gemini or Claude for a side-by-side, with visitors pasting their own keys into localStorage instead of sharing a server-side key.
Jev Demos & Experiments#community#awesomejev#catalog-import
1GitHub stars
Small Go SDK for the Jev API: three question types with matching typed answers, functional client options, and a single APIError type carrying the status code, headers and raw body.
Jev Repos & SDKs#community#awesomejev#catalog-import
Community
kyledickey/jev-goGo
kyledickey/jev-goGo2GitHub stars
A Codex UserPromptSubmit hook that asks Jev for task_type, complexity, risk and execution_mode before a task starts and injects the result as advisory context, failing open on timeouts, quota errors and invalid responses.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
wellkilo/codex-jev-preflightPython
wellkilo/codex-jev-preflightPython1GitHub stars
Browser agent that takes one Jev decision per action on top of agent-browser and only calls an LLM when confidence drops, escalating instead of guessing, with values, origins and irreversible clicks all guarded in code.
Jev Demos & Experiments#community#awesomejev#catalog-import
Community
HAR5HA-7663/hunchPython
HAR5HA-7663/hunchPythonStart 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.