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 529–576 of 625 resources
1GitHub stars
A MuJoCo pick-and-place pilot that runs Jev, Claude Haiku and hand-written reactive rules through the same episodes and publishes the comparison, including the parts that did not flatter Jev.
Jev Practices & Patterns#community#jevbest#catalog-import
0GitHub stars
A Pi extension that runs four hazard checks before bash, write and edit and four diff-quality checks afterwards, sharing one System One request per phase and applying its own thresholds.
Jev Agents & MCP#community#jevbest#catalog-import
Community
twilwa/pi-typesafeTypeScript
twilwa/pi-typesafeTypeScript0GitHub stars
Chrome extension that re-ranks Google results with TypeSafe Jev: five atomic questions per result, a weighted score, sales pages flagged and hidden, and a button to restore Google's order.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
tylergibbs1/siftTypeScript
tylergibbs1/siftTypeScript0GitHub stars
Unofficial typed Elixir client for the TypeSafe System One API: typed question structs in, typed answer structs out, atom-keyed answers, concurrent fan-out over many states and offline test stubs.
Jev Repos & SDKs#community#jevbest#catalog-import
Community
typesend/typesafe_aiElixir
typesend/typesafe_aiElixir1GitHub stars
Experimental Hermes plugin that asks Jev to label task complexity, then deterministic policy code picks the cheapest eligible allowed model and returns a routing plan. It does not dispatch the request.
Jev Agents & MCP#community#jevbest#catalog-import
Community
ussyverse/hermes-jev-routerPython
ussyverse/hermes-jev-routerPython0GitHub stars
Unofficial Go client for the TypeSafe System One API, aiming for 1:1 parity with the official JavaScript and Python SDKs: typed Noul, Choice and Score, status-specific errors, and an injectable http.Client.
Jev Repos & SDKs#community#jevbest#catalog-import
Community
valksor/typesafe-sdk-goGo
valksor/typesafe-sdk-goGo0GitHub stars
Unofficial PHP client for the TypeSafe System One API: strictly typed, zero framework dependencies, a cURL transport you can swap, and optional ResponseModel classes that decode answers into your own objects.
Jev Repos & SDKs#community#jevbest#catalog-import
Communityvalksor/typesafe-sdk-phpPHP
valksor/typesafe-sdk-phpPHP0GitHub stars
Static chart pages comparing Jev against 110 other language models on Thai standardized exams: cost and speed plotted against accuracy, plus a page on whether its stated confidence predicts correctness.
Jev Practices & Patterns#community#jevbest#catalog-import
Community
vehas/thaiexam-jev-chartsHTML
vehas/thaiexam-jev-chartsHTML2GitHub stars
SIEGE puts a live support agent with seven real tools in front of 200 attackers; every proposed call passes a TypeSafe System One action gate, and a defender loop rewrites the gate from each breach it observes.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
vnmoorthy/siegeTypeScript
vnmoorthy/siegeTypeScript2GitHub stars
jevkit is a single dependency-free Node binary exposing eleven Jev-backed decisions as both shell commands and MCP tools, including guard for gating an action, plus route, triage and semantic grep over log files.
Jev Agents & MCP#community#jevbest#catalog-import
0GitHub stars
Browser-first workbench that turns selected CSV rows into Jev judgments: up to 20 Noul, Choice and Score questions per row, with the file parsed in memory and requests proxied through a Cloudflare Worker.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
WebGrga/jev-board-labJavaScript
WebGrga/jev-board-labJavaScript0GitHub stars
A TypeScript CLI and Fastify service that puts three questions about an occupation to Jev in one request - layoff risk, trajectory and human accountability - and derives a resilience score in app code.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
WeSecureYou/Jev-testTypeScript
WeSecureYou/Jev-testTypeScript0GitHub stars
A pre-registered adversarial evaluation of jev: nine experiments, 28 predictions fixed before any request was sent, and a report plus prompting guide regenerated from the measured logs.
Jev Practices & Patterns#community#jevbest#catalog-import
Community
willkelly/jev-evaluationPython
willkelly/jev-evaluationPython0GitHub stars
A FastAPI app that turns a text prompt into 16x16 pixel art by asking Jev 256 parallel Choice questions, one per pixel over a 16-colour palette, then refining the grid.
Jev Demos & Experiments#community#jevbest#catalog-import
2GitHub stars
A Vite app where Jev picks only closed-enum labels for a composition plan and code expands those into notes, engraving, audio and MIDI, with an offline heuristic stub when no key is set.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
wustep/jev-playgroundTypeScript
wustep/jev-playgroundTypeScript2GitHub stars
Tetris where Jev picks every move from the seven legal options, but the game pre-computes landings, holes, roughness and a best plan so the model only ever judges outcomes.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
Yasserbhb/Agent-JEV-TetrisHTML
Yasserbhb/Agent-JEV-TetrisHTML1GitHub stars
A Python CLI that sorts GitHub stars into your existing GitHub Lists using README excerpts and repo metadata, writes a JSON classification report, and applies it only when you ask.
Jev Tools & CLIs#community#jevbest#catalog-import
0GitHub stars
A provider-agnostic TypeScript judgment layer for coding agents, with gates from PRD intake through release, a pluggable judge backend and a decision log you can replay.
Jev Agents & MCP#community#jevbest#catalog-import
Community
Zahrannnn/zcode-jevTypeScript
Zahrannnn/zcode-jevTypeScript0GitHub stars
An alpha Python library that uses Jev to grade model responses for hallucination, correctness and instruction following, returning Noul probabilities and five-level severity Scores.
Jev Integrations & Adapters#community#jevbest#catalog-import
Community
zavocc/ground-zeroPython
zavocc/ground-zeroPython1GitHub stars
A Pokemon Red agent that boots a ROM, picks each move with Jev, and streams video plus a live decision panel from a small read-only local HTTP server.
Jev Demos & Experiments#community#jevbest#catalog-import
Community
zbloss/jev-plays-pokemonPython
zbloss/jev-plays-pokemonPython0GitHub stars
An experimental specification and offline evaluation kit for delegated coding work: evidence schemas, a gate protocol for PASS and BLOCKED reports, and a Jev integration contract.
Jev Agents & MCP#community#jevbest#catalog-import
Community
zsoXi/agent-handoff-gatePython
zsoXi/agent-handoff-gatePython1.8kGitHub stars
Rust CLI that gives agents computer use through OS accessibility trees instead of screenshots: snapshot a live UI, act on stable element refs, then re-verify. Ships a jev-desktop skill where Jev picks the operation and target from accessibility-tree candidates.
Jev Demos & Experiments#community#jevbest
Community
lahfir/agent-desktopRust
lahfir/agent-desktopRust1.5kGitHub stars
Open-source platform that puts ACP-compatible agents such as Claude Code, Codex, and Pi inside the team's Slack, Telegram, Discord, and GitHub workflows, with reusable Jev decisions for routing, response gating, and reviewer selection.
Jev Agents & MCP#community#jevbest
1.7kGitHub stars
Open-weight 4B and 9B models from TokenRhythm: NeoHorse-1 for tool use, coding, and instruction following, plus NeoHorse-Jev-4B for prefill-only Choice, Noul, and Score decisions.
Jev Models & Reimplementations#community#jevbest
Community
TokenRhythm/NeoHorsePython
TokenRhythm/NeoHorsePython1.2kGitHub stars
The official Laravel AI SDK: one interface across providers such as OpenAI, Anthropic, and Gemini, covering agents with tools and structured output, image generation, audio, and embeddings.
Jev Integrations & Adapters#community#jevbest
Community
laravel/aiPHP
laravel/aiPHP1.5kGitHub stars
A 0.8B decision model that answers first and escalates only when unsure, plus nine LoRA adapters of roughly 41 MB each for guard, triage, tool choice, spam, and similar classification work.
Jev Models & Reimplementations#community#jevbest
Community
firelex/jeffPython
firelex/jeffPython1.1kGitHub stars
A section-by-section guide to agent harnesses - loop, tool runtime, permissions, hooks, subagents, skills, memory, background work - using Claude Code, mini-swe-agent, Hermes Agent, and deepseek-harness as worked examples.
Jev Integrations & Adapters#community#jevbest
1kGitHub stars
Sandboxed virtual machines for agents: each sandbox is a microVM that starts in about 500 ms, keeps files and state between sessions, and runs locally or in Celesto Cloud behind a CLI and Python SDK.
Jev Demos & Experiments#community#jevbest
Community
CelestoAI/celestoPython
CelestoAI/celestoPython691GitHub stars
A Python speech-to-speech avatar framework: swappable VAD, STT, LLM, and TTS modules behind one streaming pipeline, with WebSocket, telephony, LINE, and OpenAI-compatible channel adapters on top.
Jev Integrations & Adapters#community#jevbest
Community
uezo/aiavatarkitPython
uezo/aiavatarkitPython441GitHub stars
A four-layer agent toolkit for Claude Code, Codex, Factory, and Reasonix: 43 agents, 62 skills, 78 hooks, 147 scripts, and a Jev-backed router that gates dispatch on intent alignment.
Jev Agents & MCP#community#jevbest
Community
notque/vexjoy-agentPython
notque/vexjoy-agentPython452GitHub stars
An AGPL MCP server and JSON-first CLI exposing 110 astrology and metaphysics techniques from Horosa to local AI clients, running offline on macOS and Windows with SQLite-backed call history.
Jev Tools & CLIs#community#jevbest
Community
Horace-Maxwell/horosa-skillPython
Horace-Maxwell/horosa-skillPython431GitHub stars
Smithers turns issues into reviewed, tested changes through flows defined beside your code, with an optional step that keeps the project wiki current. The 1.0 release candidate runs from a source checkout.
Jev Integrations & Adapters#community#jevbest
Community
smithersai/smithersTypeScript
smithersai/smithersTypeScript2kGitHub stars
DeepOpen is a non-autoregressive decision engine built on Laya that classifies into developer-defined types in one forward pass, with a language router picking between English, multilingual, and typed-decision checkpoints.
Jev Models & Reimplementations#community#jevbest
Community
deepopen-com/deepopenPython
deepopen-com/deepopenPython376GitHub stars
Claude Code Trace renders the JSONL session files in ~/.claude/projects/ as browsable conversations with expandable tool calls, MCP tool names, and token counts, with an optional Jev pass that scores agent efficiency.
Jev Tools & CLIs#community#jevbest
Community
delexw/claude-code-traceRust
delexw/claude-code-traceRust361GitHub stars
A VSCode extension that debugs by driving the real debugger: Jev routes each paused step as a typed decision, and a generation model is called only when a breakpoint location, an expression, or a patch is needed.
Jev Tools & CLIs#community#jevbest
580GitHub stars
A community field guide to Jev and TypeSafe: the three typed primitives, runnable examples, a table for deciding when code beats a model, and directories of client libraries, agent tooling, and independent evaluations.
Jev Guides & Articles#community#jevbest
Community
AbdelStark/awesome-typesafeHTML
AbdelStark/awesome-typesafeHTML488GitHub stars
A coding agent built on pi that hands its non-code decisions — what enters the context, whether a command is safe, whether the work is done — to a small judge model at 35 decision points per turn.
Jev Agents & MCP#community#jevbest
Community
qybaihe/muTypeScript
qybaihe/muTypeScript330GitHub stars
A local-first macOS coding workspace that runs Claude Code, Codex, Cursor, Grok, Hermes, and pi over ACP, with a local Laya or hosted Jev selector choosing routes that the host then validates.
Jev Agents & MCP#community#jevbest
Community
codejunkie99/keelRust
codejunkie99/keelRust338GitHub stars
SREGym stands up live Kubernetes clusters so SRE agents can be evaluated against 90 fault scenarios, including OS-level faults and metastable and concurrent failures, in containers that cannot see the grading logic.
Jev Benchmarks & Evaluations#community#jevbest
Community
SREGym/SREGymPython
SREGym/SREGymPython715GitHub stars
Decision models that answer several choice, score, and noul questions over a state with probabilities in one forward pass, with training, two inference backends, calibration tooling, and the benchmark suite in the repo.
Jev Models & Reimplementations#community#jevbest
Community
InternLM/Intern-DecisionPython
InternLM/Intern-DecisionPython236GitHub stars
Rust governance kernel that sits between your coding agent and the repository, turning intent into bounded specifications, recorded state, and proof-backed publication across many separate invocations.
Jev Agents & MCP#community#jevbest
Community
DecapodLabs/decapodRust
DecapodLabs/decapodRust235GitHub stars
Rust terminal coding harness with one TUI across local and cloud providers, per-turn cost on the status line, routed plans scored by explicit policy, real undo, and forkable session paths.
Jev Agents & MCP#community#jevbest
Community
morganlinton/AlbatrossRust
morganlinton/AlbatrossRust402GitHub stars
Decision models that return typed probabilities for candidate labels from a state, instructions, and options, shipped as LoRA adapters plus a trained decision head over pinned Qwen base weights.
Jev Models & Reimplementations#community#jevbest
Community
Zefan-Cai/Open-JevPython
Zefan-Cai/Open-JevPython227GitHub stars
Local-first summarizer for video and posts across 11 or more sources; its optional Jev prefilter scores transcript chunks against include and exclude rules before the summary request is made.
Jev Tools & CLIs#community#jevbest
Community
martinopiaggi/summarizePython
martinopiaggi/summarizePython225GitHub stars
Go CLI that ranks large text collections by having a model compare small randomized batches across repeated trials until the order converges; with Jev it combines returned pairwise probabilities.
Jev Tools & CLIs#community#jevbest
Community
noperator/siftrankGo
noperator/siftrankGo376GitHub stars
Cross-platform chat copilot that OCRs a visible conversation, has you correct the transcript and speakers, then uses Jev or DeepSeek to pick one of seven reply strategies before drafting replies.
Jev Tools & CLIs#community#jevbest
217GitHub stars
Standardizes hundreds of public datasets into interchangeable multiple-choice, classification, and token-classification templates, and deterministically recasts them into typed choice, score, and noul decision requests.
Jev Benchmarks & Evaluations#community#jevbest
Community
sileod/tasksourcePython
sileod/tasksourcePython288GitHub stars
A local React and Express web app that takes a pasted two-person chat transcript and annotates each message with emotion and intent probabilities plus a grade for your own replies. Chinese interface, your own API key.
Jev Tools & CLIs#community#jevbest
Start 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.