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 736 resources
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
Community
lucianfialho/jev-model-routerPython
lucianfialho/jev-model-routerPython3GitHub 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
Community
ThinkyMiner/WinnowTypeScript
ThinkyMiner/WinnowTypeScript2GitHub 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
Community
hamakyo/jev-starterTypeScript
hamakyo/jev-starterTypeScript2GitHub 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
Community
ctaxnagomi/dgui-hypermemTypeScript
ctaxnagomi/dgui-hypermemTypeScript3GitHub 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
Community
coo-quack/jev-pii-checkerTypeScript
coo-quack/jev-pii-checkerTypeScript2GitHub stars
A 30-question quiz that names a feature from AWS, Azure or Google Cloud with the brand removed and asks Jev which cloud it belongs to, drawing the returned probability distribution as three bars.
Jev Demos & Experiments#community#awesomejev#catalog-import
Community
minorun365/jev-cloud-quizTypeScript
minorun365/jev-cloud-quizTypeScript3GitHub stars
A local workbench that pulls A-share quotes from AKShare or Tushare, computes indicators and candlestick patterns in Python across eight dimensions, and has Jev score each dimension into a buy, hold or sell call.
Jev Tools & CLIs#community#awesomejev#catalog-import
2GitHub stars
A GitHub Action that labels new issues only when the label probability and the model's own confidence both clear thresholds you set, and otherwise leaves the issue untouched and says why.
Jev Integrations & Adapters#community#awesomejev#catalog-import
Community
emreozyoruk/hushJavaScript
emreozyoruk/hushJavaScript2GitHub stars
Windows-first scanner and EDR triage tool that extracts structural features from binaries, scripts, documents and URLs, then has Jev return a severity score and a verdict for each target.
Jev Tools & CLIs#community#awesomejev#catalog-import
Community
newuser7171/antivirusPython
newuser7171/antivirusPython3GitHub stars
Rust event bus where routing is a judgment call: one event plus one typed question per subscription goes to a Jev judge, and the calibrated probabilities decide drop, review or deliver.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community
zkjoie/jevbusRust
zkjoie/jevbusRust2GitHub stars
Python MCP server exposing Jev System One as five typed tools, including a batched evaluate that runs a map of questions in one call, so agents consume probabilities instead of parsing prose.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
rajasekharponakala/jev-mcpPython
rajasekharponakala/jev-mcpPython2GitHub stars
Python CLI that sends each document's text extract to a Jev Choice question and files the file into a matching category folder, with a local laya backend available for offline runs.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community
jexp/watfilePython
jexp/watfilePython2GitHub stars
Claude Code plugin for Rust review that runs Clippy and cargo-semver-checks itself, has Jev triage changed units for defects no tool reports, then verifies each candidate finding before it reaches you.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
kindintelligence/jev-rust-reviewRust
kindintelligence/jev-rust-reviewRust4GitHub stars
Cursor router that has Jev pick a cost, balanced or intelligence tier per task, then enforces deterministic policy on top: security-sensitive work escalates and financial or deploy actions need approval.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
Bodila51/Jev-chooses-a-LLMTypeScript
Bodila51/Jev-chooses-a-LLMTypeScript4GitHub stars
Framework-agnostic guard layer that puts Jev in front of an agent's tool calls: a Choice risk tier, a Noul destructiveness check and a Score blast radius decide allow, deny or ask.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community
lgy1027/jevshieldPython
lgy1027/jevshieldPython2GitHub stars
Symfony app that streams a public French support-request dataset into SQLite and qualifies each request in background batches: Choice for intent, Score for urgency, Noul for whether it is a bug to forward.
Jev Integrations & Adapters#community#awesomejev#catalog-import
3GitHub stars
Simulated Perseverance crossing real USGS Jezero terrain where Jev answers narrow onboard questions in about 250 ms, Claude writes the sol plan in 15 to 80 s, and code owns every threshold.
Jev Demos & Experiments#community#awesomejev#catalog-import
2GitHub stars
Trading engine for Polymarket's five-minute Bitcoin up-or-down market: code computes P(Up) from a Chainlink feed, and Jev contributes a regime score plus vetoes on anomalous windows and direction.
Jev Practices & Patterns#community#awesomejev#catalog-import
3GitHub stars
Single-tool MCP server for Jev: send state plus a map of noul, choice or score questions to evaluate and get typed answers with probabilities and confidence back.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community
anasbekheit/typesafe-jev-mcpRust
anasbekheit/typesafe-jev-mcpRust2GitHub stars
Next.js demo that reads a draft social post and returns three typed reads from one Jev call: tone as a Choice, virality as a 0 to 3 Score, cringe risk as a Noul, plus a verdict stamp.
Jev Demos & Experiments#community#awesomejev#catalog-import
Community
silky-x0/PostmarkTypeScript
silky-x0/PostmarkTypeScript3GitHub stars
WordPress plugin that asks TypeSafe Jev typed questions about your content and hands back a probability, a named choice or a rubric score with confidence, so themes branch on values instead of parsing prose.
Jev Demos & Experiments#community#awesomejev#catalog-import
Community
juanlentino/jev-connectorPHP
juanlentino/jev-connectorPHP4GitHub stars
RubyLLM provider that turns typed questions — noul, choice and score — into calibrated answers with probabilities, confidence and per-call cost, and adds reranking through RubyLLM.rerank.
Jev Practices & Patterns#community#awesomejev#catalog-import
3GitHub stars
FastAPI demo that turns PDF text into candidate answers to your questions with Jev, then maps the returned probabilities back to the exact chunks and page positions they came from.
Jev Demos & Experiments#community#awesomejev#catalog-import
4GitHub stars
Public wall where a short question goes to Jev for a yes, no or it depends verdict with confidence in about 100 ms, with the cost of the run tracked live; signed in, Jev also picks which model answers.
Jev Demos & Experiments#community#awesomejev#catalog-import
Community
waynesutton/ask-jev-aiJavaScript
waynesutton/ask-jev-aiJavaScript2GitHub stars
Claude Code plugin that sends four typed questions about each Bash, Write and Edit call to Jev and composes the answers into a warning or a native permission prompt, in shadow mode by default.
Jev Agents & MCP#community#awesomejev#catalog-import
3GitHub stars
Python MCP server exposing Jev's three official question types plus compare, verify and batch classify, with an installer subcommand that writes the client config and a measured cost per call.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community
wangkuangkuang/jev-mcp-serverPython
wangkuangkuang/jev-mcp-serverPython4GitHub stars
Paseo plugin that classifies each message with Jev or a local Laya model and routes it to one of your presets, each carrying its own provider, model, reasoning setting and instructions.
Jev Agents & MCP#community#awesomejev#catalog-import
3GitHub stars
MCP server fronting TypeSafe Jev over HTTP for Claude Code and Codex, wrapping six tools with server-side confidence gating, cost caps, caching and a metadata-only decision log.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
Songokou1983/jev-mcpPython
Songokou1983/jev-mcpPython2GitHub stars
A HackSpain HappyRobot-track entry that runs a simulated emergency end to end: Jev reads the calls, an LLM emits policy weights, a linear_sum_assignment solver builds the plan, and Minecraft Paper renders the state.
Jev Demos & Experiments#community#awesomejev#catalog-import
Community
CarlosCaoLopez/HACKSPAIN-2026Python
CarlosCaoLopez/HACKSPAIN-2026Python4GitHub stars
A bridge from the TypeSafe platform into Symfony AI, published under the Symfony organisation, whose README points at TypeSafe's documentation for System One, the question primitives, models and the API reference.
Jev Demos & Experiments#community#awesomejev#catalog-import
Community
symfony/ai-type-safe-platformPHP
symfony/ai-type-safe-platformPHP2GitHub stars
A minimal local server exposing POST /v1/systemone, documented in three commands: uv sync to install dependencies, uvicorn main:app --reload to run it, and a curl payload in the System One request shape.
Jev Tools & CLIs#community#awesomejev#catalog-import
Community
pjt3591oo/laya-serverPython
pjt3591oo/laya-serverPython2GitHub stars
A find alternative with one extra predicate, --like, that matches files by what they are rather than what they are called; tree walking, -name, -type and .gitignore stay local, and only survivors reach jev.
Jev Demos & Experiments#community#awesomejev#catalog-import
Community
religa/jfindPython
religa/jfindPython2GitHub stars
Six runnable Python demos for TypeSafe's Jev covering the three primitives and six combination patterns, plus four notes on the programming model, the API contract, patterns and a live-key comparison.
Jev Demos & Experiments#community#awesomejev#catalog-import
2GitHub stars
A local natural-language workspace for a fictional team: ask for a board, table, cards, bubbles, grouped canvas or calendar, then follow up to reassign work, move panels, add events or build a checklist.
Jev Demos & Experiments#community#awesomejev#catalog-import
2GitHub stars
Neovim plugin that classifies your prompt with a single Jev choice question over the OpenRouter Decisions API, then dispatches to one of four native handlers: open a file, edit code, run a command, or answer a question.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
Mawfyy/jev-router.nvimLua
Mawfyy/jev-router.nvimLua2GitHub stars
Snake arena where every AI snake is steered live by Jev: one call per tick sends a `choice` question per snake and gets a move plus a probability back for all of them at once.
Jev Demos & Experiments#community#awesomejev#catalog-import
2GitHub stars
A plain-markdown extraction of 110 documents from the TypeSafe documentation site, kept in the order they appeared before the site was removed, with an index linking each file.
Jev Tools & CLIs#community#awesomejev#catalog-import
Community
thiagoadril/typesafe-docs
thiagoadril/typesafe-docs2GitHub stars
n8n community node that asks Jev several independent questions about the same state in one execution, returning typed probabilities for choice, yes/no and rubric scoring questions.
Jev Integrations & Adapters#community#awesomejev#catalog-import
6GitHub stars
A synchronizer that watches the official TypeSafe docs, agent skill and SDK repositories and regenerates a provenance-tracked reference: current state, semantic events and human-readable change reports.
Jev Repos & SDKs#community#awesomejev#catalog-import
Community
chenrui333/jev-docsPython
chenrui333/jev-docsPython2GitHub stars
An MCP server packaged as both a Codex and a Claude Code plugin, exposing eight read-only tools that turn Jev probabilities into proceed/review recommendations for routing, ranking, extraction and claim checks.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
E-FL/typesafe-as-a-judgeJavaScript
E-FL/typesafe-as-a-judgeJavaScript1GitHub stars
An open-weight Jev-class lab: a candidate-logit scorer that turns state plus a bounded rubric into calibrated probabilities per option in a single forward pass, with no generation and no parsing.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community
metask-ai/metask-jevPython
metask-ai/metask-jevPython3GitHub stars
A Codex Skill that hands Jev the task summary plus the host's real model list, so Jev picks a model and reasoning effort for an independent subtask and Codex executes with it.
Jev Agents & MCP#community#awesomejev#catalog-import
2GitHub stars
A Turkish chat toy that answers every message with one of five fixed phrases, using Jev as an evaluation model so the five-word limit is enforced by the type system rather than by prompting.
Jev Practices & Patterns#community#awesomejev#catalog-import
3GitHub stars
A DSH plugin that lets the agent consult two GPT teachers, a plan teacher and an expert teacher with a costly escalation tier, while Jev only advises whether asking is worth it at all.
Jev Agents & MCP#community#awesomejev#catalog-import
Community
LXBWOW/dsh-teacher-consultJavaScript
LXBWOW/dsh-teacher-consultJavaScript2GitHub stars
A DSH compaction backend that swaps only the summarize() hook: instead of asking a model to rewrite history into a summary, it asks Jev two yes/no questions per tool call and drops only the stale ones, keeping user and assistant prose verbatim.
Jev Agents & MCP#community#awesomejev#catalog-import
CommunityLXBWOW/dsh-context-curatorJavaScript
LXBWOW/dsh-context-curatorJavaScript2GitHub stars
A DSH plugin that checks whether an agent's claim of finished work holds up, using deterministic evidence from code and one batched Jev request per turn. Under policy_v 3 the probabilities are logged only; they decide nothing.
Jev Agents & MCP#community#awesomejev#catalog-import
4GitHub stars
A DSH plugin, published to npm, that registers one agent tool, jev_decide, so a coding agent can ask TypeSafe's Jev a typed question and get a calibrated probability instead of guessing from intuition.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community
nanami-0713/dsh-jev-decideJavaScript
nanami-0713/dsh-jev-decideJavaScript3GitHub stars
Grades the coding agent sessions already sitting on your disk. Jevalyzer reads Claude Code, Codex CLI, opencode, Gemini CLI and Antigravity transcripts, scores each exchange, and renders an interactive HTML report or terminal dashboard.
Jev Practices & Patterns#community#awesomejev#catalog-import
Community
killerz3/jevalyzerTypeScript
killerz3/jevalyzerTypeScriptStart 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.