GitHub - MrJev/awesome-jev: A curated list of projects, integrations, and resources for Jev, TypeSafe AI's System One model.

Awesome Jev

A curated list of projects, integrations, and resources for Jev, TypeSafe AI's System One model: typed decisions with calibrated confidence instead of text.

Jev answers structured questions ( Choice , Score , Noul ) about program state in a single fast pass. The projects below use it for the questions that come up again and again in real software: should we, which one, how much, what next?

Open-ended generation and deep reasoning still go to a conventional LLM.

208 entries · every one checked to actually call Jev · last reviewed 2026-09-22

There are over a thousand Jev repositories on GitHub, and most of them only mention it. This list is selective, and the bar is written down:

• Jev is central. Someone opened the code and confirmed the project calls Jev (or reproduces it), rather than naming it in a README.

• 10+ stars , so a day-one burst of near-identical repositories does not fill the list. Official projects and notable teams can arrive earlier.

• It runs. A README that explains what it does and how to run it.

• Numbers carry a source. Speed, cost and accuracy figures come from the project itself and are marked as author-reported.

Listing is not endorsement, and a description is not a safety review. Several entries here send code, prompts or screen contents to a third party; some have no licence. Read what a tool sends before you install it — what each tool sends says so for every project we have run.

Browse and filter this list, and read guides on getting started and pricing, at mrjev.com .

This is an unofficial, community-maintained list. It is not affiliated with or endorsed by TypeSafe AI. Performance numbers quoted here are reported by each project's author unless noted otherwise.

Contents

• Trending

• Recent Developments

• What We Found Running These

• Running Without Jev

• Official Resources

• Community SDKs

• Libraries & Integrations

• Agent Integrations (MCP & Skills)

• Coding Agents & Developer Tools

• Guardrails & Safety

• Model Routing

• Command-Line Tools

• Browser & Computer Use

• Data & Observability

• Search & Knowledge Graphs

• Apps & Browser Extensions

• Evaluation & Benchmarks

• Open Models & Reproductions

• Games & Real-Time Demos

• Robotics & Embodied

• Finance

• Articles & Analysis

Trending

Stars gained in the last 7 days, from our own daily snapshots. Updated 2026-09-22.

Project Stars This week

browser-use/jev-ultrafast 16,212 +12,569

tamaratran/fast-jev-compaction 6,029 +4,074

TianyuCodings/NanoJev 1,846 +1,710

jarrodwatts/jev-trader 1,878 +1,196

awlevin/typesafe-computer-use 763 +582

vinnylarouge/jevlike 1,170 +393

devagrawal09/jev-review 500 +291

droidrun/mobile-jev 328 +265

thruwire/foreman 469 +226

gargpratyush/jev-router 314 +216

New to this list this week: jaredpalmer/kev , bespokelabsai/nimble , githubnext/localjev , Sac-Y/Jev-cu , featherless-ai/simple-jev and 121 more.

Sortable, with hands-on reviews: mrjev.com/projects .

Recent Developments

The Jev ecosystem is days old and moving; these are the changes that affected the projects below.

Date What changed Source

2026-09-18

Python SDK 0.7.0. Breaking: Pydantic replaces msgspec, and system_one() gains response_model to parse answers into your own model.

Release notes

2026-09-18 Jev on OpenRouter: typesafe/jev-1.13 plus a latest alias, at TypeSafe's own price. Model page

2026-09-16 Jev on Vercel AI Gateway as typesafe-ai/jev , through AI SDK 7's experimental evaluate API, with zero-data-retention and no-training as provider options. Announcement

2026-09-15 JavaScript SDK 0.6.0. Breaking: Score criteria became an ordered array. Release notes

Dated timeline with sources: mrjev.com/changelog .

What We Found Running These

Every project we review is run in a container with a real Jev key. A sample of what that turned up, and what came of it.

Project What running it turned up Review

pi-warden Redaction missed the password in a postgres:// URL, and the holds database failed on a fresh machine. Fixed by the maintainer the same day. Read

jev-router v0.3.0 left recent prompts in /tmp readable by other users on Linux. Fix merged upstream. Read

jev-browser Every typing step presses Enter, so filling a contact form submits it. Read

tax-doc-classifier Right on every IRS page we tried, but result.form still names a form for a page that is not a federal form at all; gate on gated . Read

abide The README promised zero data retention on every call; on the direct-key path it was never requested, as we confirmed on the wire. README fixed. Read

Jev-cu The policy gate matches a label already truncated to 120 characters, so a long label can hide the word 'delete'. Read

typesafe-computer-use The README said no screenshot is sent; the final answer includes one. Read

Foreman Codex ran with the Jev key in its environment; since v0.3.0 the key is stripped first. Read

jeff jeff check . sent a .pem private key and a config file with a password, whole. Fixed in v0.1.0; we re-ran the harness to confirm. Read

Von The published weights lost their classification head, so the default install answered at random. Restored by the author the same day. Read

All 143 reviews, with what each tool sends and where: mrjev.com/best-jev-tools .

Running Without Jev

Jev is a paid API, so a fair question is which of these still work if you would rather not pay for it ( #17 ). Two things get mixed up in that question, and they are worth separating.

Routing Jev through OpenRouter or Vercel's AI Gateway is not an alternative model. It is the same paid model with a different bill and an extra hop. Many entries offer it, and it changes nothing about cost per decision or licensing.

Pointing a tool at a different model is the question people are actually asking. The table below is only what we checked ourselves, by running each tool against a server of our own. A project missing from it means we have not checked, not that the answer is no.

Tool Points at a non-Jev endpoint? How we know

Jevvy Yes — provider: "custom" , any endpoint, optional key We ran its Claude Code hook against a local server of ours

jev-use Yes — TYPESAFE_BASE_URL , and JEV_BACKEND=mock for a keyless dry run We ran its PreToolUse hook adapter against a local server of ours

JCR Yes — the SDK's own TYPESAFE_BASE_URL We ran the resolver against a local server of ours

hermes-jev-approvals Yes — a custom base_url with an optional key_env Read in its code and covered by its own boundary test; we did not drive that path

Jev Skills No — an allow-list of exactly two endpoints, both Jev routes We tried a third and it was refused, by design

Jev Agent Skill Router No — one hardcoded endpoint We had to patch the constant to test it

Jev DSH No — endpoint constant, no override We injected a fetcher to test it

jev-seo No — hardcoded constant, no override We patched the line, then reverted and diffed

jevscan-evm No — endpoint constant, no override Same

For tools that need no Jev at all, the whole Open Models & Reproductions section below is that answer: those projects replace the model rather than the route. Two things to check before picking one.

First, the weights' licence, not just the repository's — most are MIT or Apache-2.0 on the code, while the weights vary: OpenThai-SystemOne and PlayJev are Apache-2.

0 on both with the base model credited, Von's published weights carry no licence tag at all, and NanoJev declares none on either the model or the dataset.

Second, what shape it is: several are a library rather than an API, so choosekit reads probabilities straight out of your own llama.

cpp but ships no HTTP server, while OpenThai-SystemOne and others speak POST /v1/systemone , which existing SDK code reaches with a base-URL change.

Official Resources

• TypeSafe AI - Homepage and early-access waitlist.

• Introducing System One Models & Jev - Launch post.

• Documentation - Concepts, the three question primitives, patterns, and API reference.

• Quick start - First API call.

Python SDK - Official Python client ( pip install typesafe-sdk ).

• JavaScript SDK - Official JavaScript and TypeScript client ( npm install @typesafe-ai/sdk ).

• Cookbooks - Official recipes for guardrails, re-ranking, RAG passage classification, citation checks, and more.

• Patterns - Confidence-gated routing, speculative fan-out, composite scoring, and intent routing.

• Jev 1.13 jaggedness - Where the current model is known to be weak.

• Evals - TypeSafe's published evaluations.

• Jev on Vercel AI Gateway - Access Jev through Vercel's AI Gateway.

Community SDKs

• typesafe_sdk - Elixir SDK for the System One API.

• typesafe-sdk-java - Zero-dependency Java client (Java 21+).

• typesafe-go - Go client.

• kunobi-jev - Rust client, published on crates.io.

• typesafeai-dotnet-sdk - .NET SDK.

• TypeSafe Swift SDK - SwiftPM client whose behaviour follows the official JavaScript SDK.

Libraries & Integrations

• Advocaat - Small type-safe TypeScript client for asking Jev about your data, with an agent skill for designing questions.

• jev-harness - TypeScript library that wraps Jev answers in policies, confidence gates, shadow mode, and reusable recipes.

• zod-jev - Adds Jev semantic checks to Zod 4 schemas. Zod validates the shape; Jev validates the meaning.

• ruby_llm-typesafe - TypeSafe provider for RubyLLM 2.

• hono-jev-router - Experimental Hono router that matches requests against plain-language descriptions instead of paths.

• jev-tree - Recursive Choice over a taxonomy, for picking among more options than a single Choice question allows.

• n8n-nodes-typesafe - n8n community node for asking typed questions inside workflows.

• Jev for Home Assistant - Home Assistant integration that turns Jev's answers about your house into entities.

• jevcache - Local decision cache keyed on (model, schema, state), with redaction and canonicalisation before hashing, for cheaper repeats and deterministic replay in CI. No license file at the time of writing.

• invalidate - Gives every remembered fact a lease and asks Jev whether new evidence ends it, so an agent's memory can be made to go stale on purpose.

• System One Harness - Turns a decision model into an agent loop: it compiles the environment's finite action space into typed questions, gates each step by confidence, and records the trace.

• Hunch - Probabilistic control flow for Ruby and Rails, with predicates that read like ordinary conditionals.

• Jevalyn - Rails-native decision layer with typed results, guardrails, a router and test helpers.

• feelings - BAML language support for an AI if-statement: .feels() as a real, typed method backed by a decision model.

Agent Integrations (MCP & Skills)

• typesafe-mcp - MCP server that lets agents such as Claude Code, Claude Desktop, and Codex call Jev directly for Choice, Score, and Noul decisions.

• jev-mcp - Proof-of-concept MCP server with ready-made tools for fact checking, prompt-injection detection, and semantic ranking.

• askjev - MCP server published on npm, with setup instructions for Claude Code, Claude Desktop, Cursor, and Codex.

• jev-eval-mcp - Eval-first MCP server that focuses on knowing whether Jev's answers can be trusted for your task.

• Building with Jev - Agent skill for writing programs that call Jev: question design, state structure, confidence thresholds, and diagnosing wrong answers.

• Jev Sift - MCP plugin that asks Jev which files, web pages, or text snippets are relevant to a query, so the agent reads selectively.

• Jevbridge - ACP and MCP adapter that pairs Jev with any LLM agent, including Codex, Claude, Grok, and OpenCode, for typed decisions and computer use.

• Hermes Jev Skills - Bundle of skills that hand an agent's small decisions to Jev: model routing, skill selection, retrieval filtering, compaction, and computer use, with a routing dashboard. Works with Hermes, Claude Code, and Codex.

• jev-mcp (burnigtm) - MCP server whose tools route the next step and decide whether a partner model is needed, for Cursor, Codex, and any MCP client.

• jevwire - An MCP server, an embeddable decision library, and an escalate-only Claude Code plugin in one repository.

• pi-jev - Semantic tool routing and skill discovery for the Pi coding agent: Jev picks which inactive tools to activate for the prompt at hand.

• Awesome Jev Skills - Nine installable agent skills — triage, routing, code review, document and UI work — with a catalogue of scenarios to copy.

• Jev DSH Decision Engine - Decision plugin for agent harnesses: Jev picks the tool, skill or owner and scores the output, while the agent keeps planning and execution. Ships for DeepSeek Harness and iPolloWork.

• Jevify - Agent skill for finding where Jev fits in an existing codebase, designing the typed questions, and measuring whether it helped.

• lorenzini - Claude Code skills that wait for CodeRabbit, Copilot or Codex to finish reviewing a pull request, then judge whether the verdict actually permits a merge.

• Jev Studio - One pip install for experimenting: MCP tools for Choice, Noul and Score, prompt libraries and a slash command per cookbook recipe.

• jevvy - Plugins for coding agents, starting with one that auto-approves shell permission requests it judges harmless and passes everything uncertain to the normal flow.

• JCR (Jev Capability Resolver) - One tool that searches a nested capability tree and hands the agent only the documented commands and context a task needs.

• jev-superpowers - Skills framework for coding agents with typed gates on package choices and task completion.

• jev-use - Claude Code, Codex and pi plugin that hands the agent steps needing no written output to Jev and leaves the prose to the LLM.

• hermes-jev-approvals - Approvals provider for Hermes Agent: it judges shell commands and refuses every other task, registering no hooks.

Coding Agents & Developer Tools

• fast-jev-compaction - Claude Code plugin that replaces the compaction summary with Jev decisions. Every tool call and result is scored; stale ones are dropped or truncated, and everything kept stays verbatim.

• Jev Codex Router (archived) - Picks the model, reasoning depth, and speed mode for every Codex turn based on how hard Jev judges it to be. The author reports about 60% lower cost when replaying 237 real turns.

• Foreman - Puts Jev as a fast supervisor above slower coding agents such as Codex, starting from a ticket, spec, or bug report.

• Winnow - Context sieve for Claude Code. Jev judges each tool result (Read, Bash, Grep output) for relevance before it enters the context window.

• Jev Review - Staged code-review workflow for JavaScript and TypeScript with a local dashboard. Jev screens correctness, security, reliability, compatibility, and test risk, then scores severity and suggests a reviewer, with no generative model involved.

• Jev Review MCP - Local-first MCP server for continuous software-quality review by coding agents.

• Stanley Code - Bounded Jev workflows for coding agents (formerly jev-code).

• SkillRanker - Rust CLI that ranks which agent skills fit the next step from live session context, with Claude Code hooks.

• JevLint - Checks code against conventions written in plain English, in a write-check-fix loop with your coding agent.

• compact-adviser - Agent plugin that asks Jev whether the session is at a safe point to /compact , and can run it automatically on Pi and Claude Code.

• jev-pruner - Claude Code plugin that uses Jev to trim long Bash output before it reaches the model, leaving errors, source code, and structured output untouched.

• perch - Semantic linter that reads each method together with its callers and callees before asking about it. Rules are sentences in a YAML file.

• jev-lint (mizchi) - Checks whether a function does what its name says, whether a comment is still true, and whether a test verifies what it claims, with a cutoff per rule.

• patdown - Lints a tree against fuzzy rules kept in one markdown file, behind a provider-neutral interface so the judge can be swapped. Its LICENSE is not a recognised open-source license.

• agent-dispatcher - Routes a Claude Code or Codex task to one of 27 specialist roles and defines what evidence will count as done.

• Jot - A general-purpose agent loop where Jev picks the next move and Jot runs it. No license file at the time of writing.

• oxlint-plugin-jev - Oxlint rules written as plain-English questions about a function, call, JSX element or file, reported when the yes-probability clears your cutoff.

• Jev Agent Skill Router - Routes a request to the agent skills it needs, with a confidence floor below which it loads nothing.

• yummy-pi-extensions - Extensions for the Pi coding agent, each released separately, including a Jev-based model router.

Guardrails & Safety

• tripwire - Runs seven checks on every LLM response in one Jev call, as AI SDK middleware or an OpenAI-compatible proxy.

• jev-gates - Seven calibrated gates for Claude Code (rules, scope, intent, done, claims, proof, and commit honesty) that escalate but never approve.

• pi-warden - Guardrails for the Pi coding agent. Jev judges every write and edit against the rules in pi-warden.md .

• jev-belay - Claude Code Stop hook that checks the transcript for evidence before letting a "done" through, and spends one four-question Jev call only when files changed with no passing check since. Fails open on every error path.

• Abide - Hooks into Claude Code, Codex, and OpenCode, and asks Jev one question per rule whether each edit breaks your AGENTS.md or CLAUDE.md rules.

• jev-guard - Risk-scores every tool call against session context into deny, ask, or allow, and flags prompt injection in tool results.

• Pi Jev Guard - Pi coding-agent plugin with rules configured by timing, plus risk checks, output redaction, and reminders on repeated failures. Chinese documentation.

• is-malicious - Sends source, configuration, build, and CI files to Jev and points at the files and lines that look deceptive or data-stealing. Its README says a clean report is not proof a project is safe.

• jevscan-evm - Produces a heat map of likely bugs in EVM code. The author's own warning: a proof of concept whose code they did not read.

Model Routing

• jev-router - Per-turn model routing for Claude Code and Codex. Simple work goes to the fast tier and difficult work to the strong tier.

• tiershift - Sends each LLM request to the cheapest model tier that can handle it and escalates on evidence.

• safer-with-jev - Neon Function proxy for the Neon AI Gateway. Jev classifies each request and routes it to the right downstream model.

• jev-gateway - Local gateway for Codex and Claude Code that asks Jev which tool to call next and passes everything else to your usual model.

• JevRouter - Routes each agent step to a model, subagent, Skill, MCP tool, or CLI with one Jev Choice, requiring confirmation for risky capabilities and keeping decision receipts.

• Grok Bot Jev Router - Classifies a Grok Bot request before expensive research, browser, retry, or subagent work, so it can reuse a fresh artifact or stop a failing retry.

• pi-jev-router - Ranks the OpenRouter catalogue per task, takes the Pareto frontier over quality, cost and latency, and routes pi to the knee point.

Command-Line Tools

• SemDecide - Unix-style CLI for typed semantic decisions: classify, score, filter, and guard inside shell scripts, CI, and data pipelines.

• jev-repl - Terminal REPL for shaping System One requests before writing code. Simulates answers when no API key is set.

• triagedy - Security alert triage as a Unix filter: JSONL alerts in, typed decisions out.

• jev-shell-history - Fish-style zsh autosuggestions, ranked by Jev from your recent history.

• commit-miner - Classifies Git commits into bug fixes, security fixes with CWEs, and change types.

• TypeSafe AI Playground - Rust CLI of Jev experiments, including PHI detection, code-comment review, live tone analysis, and occupation and industry classification.

• jev-commit - Pre-commit hook where one Jev call checks whether the commit message matches the staged diff, flags debug leftovers and unmentioned work, and blocks only when it finds a credential.

• semgrep (uehaj) - Grep by meaning: Jev scores each line against a description in any language, with AND, OR, and NOT. A single dependency-free Node file.

• jeff (Alurith) - Read-only Go CLI that checks files against rules such as unclear responsibility or weak error handling with Jev, locally or in CI.

• jegrep - Semantic grep with no embeddings, index, or daemon: it searches the live tree on every run and matches concepts rather than strings.

• jgrep - Like grep, but the pattern is a description: it filters piped output as well as files and prints a probability per line.

• jev-cli - Typed judgments from the command line, published to npm as jevctl .

• Sniff Test - Prose linter for AI writing tells: countable regex rules run locally, and one judgment question covers the rest.

• jev-seo - Rust CLI and MCP server for SEO and GEO work, scraping DuckDuckGo instead of paying for a search API.

• JevGrep - Semantic code search for agents, as a CLI or MCP server: ask what the code does and get source excerpts with paths and line numbers.

Browser & Computer Use

• jev-ultrafast - Fast browser agent from Browser Use. Jev decides each step and which element to act on; a small model is called only when text needs to be typed. The authors report a full Google Flights search in about 7.1 seconds.

• typesafe-computer-use - macOS computer use without sending screenshots to a large model. The screen is read deterministically and Jev picks the next action.

• Jev Browser - Headless browser automation through an MCP server, CLI, or library. Jev picks one action per step.

• Mobile Jev - Android phone automation from DroidRun on its Mobilerun device cloud, with Jev choosing every operation and target. The author reports reaching Uber's payment selection in about 21 seconds.

• agent-desktop - macOS desktop automation over accessibility trees. Since v0.9.2, its jev-desktop scripts let Jev choose which control to operate and which action to take.

• Jev-cu - Codex computer-use skill where Jev picks the next element and action from on-screen text, with a local policy gate for sensitive steps. README in Chinese.

• voice-browser - Voice-controlled Chromium: on each partial transcript, one Jev request judges intent, target element, and whether the command is complete or destructive.

• JevScout - Coding-agent skill that drives Chrome over CDP to look for jobs on company sites, with Jev scoring pages and links.

• macbrow - Say a command and it runs as AppleScript, or say a web task and it drives Chrome. Its README opens with a warning about an early version tidying a Desktop rather thoroughly.

• jev-use - macOS computer use by voice or typing that reads the screen through the Accessibility tree rather than screenshots. Key stored in the Keychain.

• Jev Voice - Local whisper.cpp for the transcript, then one Jev request picks the action and its typed arguments; code owns execution.

• Jev macOS Loop - Native macOS GUI automation on Apple silicon: OmniParser CoreML and Apple Vision OCR identify controls locally, Jev selects the action. AGPL-3.0.

• Jev Desktop - Adds a bounded decision loop to Codex Computer Use for browser tabs and native macOS apps.

• fastbrowse - Browser agent that indexes the page into candidates for Jev to pick from, leaves planning and reading to an LLM, and cites a quote from the page for every claim.

• Jev Social - Instagram, TikTok and LinkedIn research where Jev chooses each next operation and a real Chrome session executes it, with the evidence kept.

• Jev for Chrome - Manifest V3 port of jev-ultrafast that drives the tab you are already looking at, keeping the same observation format and execution rules.

Data & Observability

• pg-jev - PostgreSQL extension to filter, rank, and classify rows with plain-language conditions.

• jevql - A psql-shaped CLI and Go/TypeScript/Python SDKs that add jev() , jev_prob , jev_choice , and jev_score to queries against a vanilla Postgres with no extension. The SQL runs on the server and Jev judges the surviving rows in batches.

• duckdb-jev - DuckDB extension that returns Jev's answers as real SQL types.

• Jev Logs - Scores OpenTelemetry logs for diagnostic value, priority, and routing before expensive LLM analysis.

• pg_typesafe - Pre-alpha PostgreSQL extension that calls Jev from SQL for Choice, Noul, and Score, with EXECUTE revoked from PUBLIC by default.

• tax-doc-classifier - Classifies tax-document pages into IRS forms and page kinds with one Jev request per page, driven by a JSON file of form descriptions.

• doc-router - Rust tool that asks Jev which PDF pages actually need OCR, extracting text pages locally and sending only the rest to your OCR provider.

Search & Knowledge Graphs

• Blink - Semantic codebase search. At each directory level Jev ranks which files and folders are most likely relevant and sends more walkers there.

• neo4jev - Navigates a Neo4j graph by having Jev score neighbouring relationships, then beam-searching for the most probable path.

• jev.nvim - Neovim plugin that splits the buffer into functions with Treesitter, has Jev score each one against a plain-language question, and lists the answers in the quickfix window ranked by probability.

Apps & Browser Extensions

• unclutter - Browser extension that removes page clutter using Jev and reusable template rules.

• TypeSafe AdBlock - Chrome extension that asks Jev whether each DOM element is an ad and removes the ones that are.

• Jev Moderation Bot - Discord bot that filters spam and scam links in real time and escalates repeat offenses.

• jevmeter - Scores every sentence in a video and renders a live Jev meter as a 16:9 edit.

• jev-skip - Browser extension that reads the caption track and paints a sponsor-probability overlay on the YouTube seek bar before the intro ends, with no crowd database. The author reports catching 77% of SponsorBlock's sponsor seconds across 23 videos at $0.0008 per video.

• Jev Chat - Chat-style command bar where Jev picks the tool, arguments, and reply type, and code builds every reply from tool data.

• Sharp - Browser extension that filters your X timeline by plain-language rules, with Jev as the default classifier.

• lurk - Self-hostable Reddit buyer-intent finder that uses Jev to judge every post and comment a scan reads.

• jev-paint - Local app that turns Jev's per-pixel probability distributions into paintings.

• Live Jev - Control Ableton Live with one sentence, in Japanese or English, from a bar that appears over the session and gets out of the way.

• x-scanner - Chrome extension that labels every post you scroll past on X with six typed questions per post, and counts what it costs in the corner.

• RefGarden - A three-dimensional reference gallery over The Met, NASA, Cosmos, and the Prelinger Archives, with Jev choosing the search phrases.

• Cheshi - macOS workspace for Codex where Jev finds past sessions and the decisions made in them. Apple silicon only.

• Jev Reviewer - Extracts data for systematic reviews from a trial report and its supplements, quoted from the paper, against your own form or a RoB 2 template.

• dasheng - Read English aloud and see which words were wrong: streaming speech recognition transcribes, Jev judges word by word, and both models can run on your own GPU.

• Vibe Check for X - Chrome and Firefox extension that scores a draft X post on a dozen dimensions and gives a send-or-don't verdict before you publish.

• Crush Monitor - Reads a WeChat conversation and labels each message with emotion and intent, rating how your own replies landed. Local, with your own key.

• Jevmail - Read-only Gmail triage that sorts an inbox into five trays with an urgency score, running locally through a gateway key

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