Awesome Jev [](https://awesome.re)

September 20, 2026 · View on GitHub

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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.

118 entries · every one checked to actually call Jev · last reviewed 2026-09-20

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

Stars gained in the last 7 days, from our own daily snapshots. Updated 2026-09-20.

ProjectStarsThis week
browser-use/jev-ultrafast9,002+5,359
tamaratran/fast-jev-compaction4,352+2,397
TianyuCodings/NanoJev1,021+885
jarrodwatts/jev-trader1,324+642
awlevin/typesafe-computer-use529+348
vinnylarouge/jevlike1,002+225
droidrun/mobile-jev232+169
thruwire/foreman402+159
devagrawal09/jev-review358+149
realZachi/pg-jev218+127

New to this list this week: jaredpalmer/kev, bespokelabsai/nimble, githubnext/localjev, Sac-Y/Jev-cu, featherless-ai/simple-jev and 31 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.

DateWhat changedSource
2026-09-18Python SDK 0.7.0. Breaking: Pydantic replaces msgspec, and system_one() gains response_model to parse answers into your own model.Release notes
2026-09-18Jev on OpenRouter: typesafe/jev-1.13 plus a latest alias, at TypeSafe's own price.Model page
2026-09-16Jev 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
2026-09-15JavaScript 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.

ProjectWhat running it turned upReview
pi-wardenRedaction 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-routerv0.3.0 left recent prompts in /tmp readable by other users on Linux. Fix merged upstream.Read
jev-browserEvery typing step presses Enter, so filling a contact form submits it.Read
tax-doc-classifierRight 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
abideThe README promises zero data retention on every call; on the direct-key path it is never requested, as we confirmed on the wire.Read
Jev-cuThe policy gate matches a label already truncated to 120 characters, so a long label can hide the word 'delete'.Read
typesafe-computer-useThe README said no screenshot is sent; the final answer includes one.Read
ForemanCodex ran with the Jev key in its environment; since v0.3.0 the key is stripped first.Read

All 38 reviews, with what each tool sends and where: mrjev.com/best-jev-tools.

Official Resources

Community SDKs

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.

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.
  • evaluate (PyModel) - stdio MCP server exposing one evaluate tool; the host agent still reasons, edits, and executes.
  • 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.

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.

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.

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.

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.

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.

Evaluation & Benchmarks

  • jevcal - Picks the confidence threshold that meets your accuracy target on your own data, and fails CI when a model update breaks it.
  • Janus - Measures Jev's calibration and confidence-based routing on Banking77 and Web of Science.
  • jev-benchmarks - Probability-aware evaluation: calibration, and how much work can be automated at a fixed error budget.
  • typesafe-ai-benchmark - Compares LLM structured output with Jev on latency, cost, and judgment quality.
  • Jev Capability Atlas - A bilingual map of where Jev holds up and where it breaks, built from recorded API calls rather than a leaderboard. Its LICENSE is not a recognised open-source license.
  • jev-align - CLI from Sutro that finds the examples a Jev function is least sure about, asks you to label them, and uses GEPA to improve the question.

Open Models & Reproductions

  • SemIf - Jev-style decisions from a frozen 4B model on a single RTX 3090, with a browser demo. Formerly OpenJev.
  • Jevlike - Train a small model that scores a changing list of text options in one pass.
  • NanoJev - 0.6B parallel decision model with an end-to-end training pipeline.
  • openjev-sglang - Jev-compatible API server running an open model on SGLang.
  • jevmlx - Jev-style typed decisions from local MLX models on Apple Silicon.
  • kev - Jev-style decision models from 0.5B to 8B, built as LoRA adapters on Qwen and served behind a Jev-compatible /v1/systemone API.
  • LocalJev - Local Jev-compatible /v1/systemone server for Bun that asks DiffusionGemma for probabilities, from GitHub Next.
  • Bespoke Nimble - Open data, training recipe, and a 9B model for Jev-style choice and true/false decisions on Apple Silicon or NVIDIA GPUs.
  • Simple Jev - Turns open Hugging Face models into a Jev-style classifier endpoint by reading next-token logits, with a public demo API.
  • OpenJev - Jev-compatible decision server on DiffusionGemma 26B-A4B through vLLM, including questions about images. TypeSafe's SDKs work against it unchanged.
  • jeff - Self-hosted implementation of Jev's System One API on the 400M-parameter GLiFormer model. The official SDK works after changing the base URL.
  • Von - Non-autoregressive System One model with Python and TypeScript clients, published on Hugging Face under Apache 2.0. The author reports sub-25ms inference.
  • openJev-verdict-2.0 - A 151M non-autoregressive decision model on ModernBERT with calibrated uncertainty and an in-browser WebGPU playground. Its LICENSE is not recognised as the Apache 2.0 its badge claims.
  • OpenDecision - Open-source semantic decision engine: state, a question in natural language, and answer criteria in; a structured decision out.
  • Open Alternative to Jev - Typed, calibrated decisions from any open-weights model in one forward pass, as the Python package open-alternative-jev.
  • choosekit - Scores a finite set of choices with a model you already run in llama.cpp and returns a typed decision with a probability distribution.
  • Jev Local - A local /v1/systemone server with two backends: an LFM model zero-shot, and a fine-tuned ModernBERT-Ja cross-encoder. Japanese documentation.

Games & Real-Time Demos

  • 1v1 Jev - Three.js quickscope arena where Jev decides movement, aiming, ADS, firing, and jumping at roughly 9 Hz.
  • TypeSafe Mario - Jev picks NES controller inputs for Super Mario Bros. from emulator state, with no screenshots.
  • Jev Plays StarCraft - Jev plays the first StarCraft shareware mission, with its recorded action probabilities.
  • Jev Pong - Pong where the ball moves one step per model decision, pitting Jev against chat LLMs.
  • JevPilot - Three.js driving simulator with a Jev-powered autopilot.
  • jev-drone - Camera-only quadrotor in MuJoCo with Jev making judgment calls at about 2.5 Hz.
  • Jev Chess Lab - Recorded chess experiments with a candid result: Jev on its own still blunders pieces.
  • jev-plays-pokemon-red - Pokemon Red on PyBoy where code owns the route and the arithmetic and Jev only picks at branches, logging a Brier-scored faint prediction against RAM state on every battle turn.
  • Jev Self-Driving Sim - A 2D top-down car in the browser that turns its sensors into a JSON state every 200 ms and executes four typed answers. No license file at the time of writing.

Finance

  • Prism - Liquidity-provision agent for Meteora DLMM. Jev judges toxic flow, market stress, and mean-reversion likelihood in shadow/advisory mode only, without driving trades. Not financial advice.
  • jev-trader - Asks Jev buy or sell on every Monad block and places real post-only limit orders on the Kuru MON-USDC book. Not financial advice.
  • Jev Trade - Hyperliquid trading bot based on jev-trader, where Jev decides buy, sell, or hold on every tick for five coins. Dry-runs without a private key.
  • Jev X Sentiment Analysis - Crypto terminal that reads up to 1,000 posts about a ticker alongside market and funding data and turns them into a buy, sell, hold, or take-profit call. No license file at the time of writing. Not financial advice.

Articles & Analysis

Other community lists of Jev projects, each with its own scope and bar:

Contributing

Contributions are welcome! Read the contribution guidelines first.