Independent guide to Jev AI — typed decisions, System One API, pricing & tools.

Jev AI Tools

Jev AI is the community name for TypeSafe AI's System One API — it returns typed decisions instead of free text. what is Jev AI

Browse the Jev AI tools directory.

Open on-site project pages.

Try the playground when ready.

Try Playground

Jev AI tools directory

Find the right Jev tool
and project

Ask what you need — Jev scores featured tools with Score questions and ranks the best fits. Or browse the full catalog below.

powered byJev

Featured projects

Ask what you need — ranked by Score

TypeSafe JavaScript SDK

Official TypeScript/JavaScript client with inferred answer types. npm install @typesafe-ai/sdk.

View

System One adapter (Python)

Official drop-in TypeSafeClient replacement backed by OpenAI, Anthropic, and compatible LLM APIs, for comparing Jev against chat models.

View

TypeSafe Python SDK

Official sync and async Python client. pip install typesafe-sdk.

View

zod-jev

Zod validates the shape, Jev validates the meaning: semantic checks on request bodies become calibrated probabilities you threshold in code.

View

sdk.ts

import { TypeSafe } from '@typesafe-ai/sdk'

const client = new TypeSafe({ apiKey: process.env.TYPESAFE_API_KEY })

const result = await client.systemOne({
  state: 'User asks to cancel subscription',
  questions: [
    {
      id: 'intent',
      type: 'Choice',
      question: 'What should we do?',
      options: ['CANCEL', 'RETAIN', 'ESCALATE'],
    },
  ],
})

console.log(result.answers.intent)

Jev AI tools directory

Featured Jev AI tools

Curated Jev AI tools and projects with on-site detail pages. Open a card for overview, install notes, and related tools — then browse the rest by category.

Showing 24 featured · 561 in catalog

Browse by category:Official SDKs & clients Integrations Agent tooling Browser & computer use Applications All 11 categories →

Browser & computer use

306

unclutter

WXT browser extension that uses Jev-powered decisions plus reusable template rules to remove page clutter.

Project pageView

Official

245

TypeSafe JavaScript SDK

Official TypeScript/JavaScript library for the TypeSafe API — systemOne with choice helpers on Node 20+.

Project pageView

Official

231

TypeSafe Python SDK

Official Python client for the TypeSafe API — Choice, Score, and Noul helpers around system_one.

Project pageView

Integrations

142

neo4jev

TypeSafe System One (Jev) navigates Neo4j by classifying neighbouring relationships — Choice + Noul per hop, beam search over paths.

Project pageView

Benchmarks & research

111

JevK5

Apache-2.0 open-weight Jev alternative: noul / choice / score with probabilities, TypeSafe-style /v1/systemone, weights on Hugging Face.

Project pageView

Benchmarks & research

jevfire

CUDA + vLLM decision layer that scores finite choices in parallel from a shared prefix — inspired by Jev, no retraining required.

Project pageView

Benchmarks & research

jevmlx

Schema-driven parallel constrained decisions for any MLX model on Apple Silicon — typed, schema-valid JSON from one forward pass.

Project pageView

Benchmarks & research

LitJev

Turn off-the-shelf Qwen models into a fast decision layer with Choice / Score / Noul over a System One–compatible HTTP API.

Project pageView

Benchmarks & research

jevgpt

Chat client that autoregressively asks Jev “Next word?” over a dictionary — a chatbot on a model that cannot generate text.

Project pageView

Agent tooling

omp-jev-compaction

Verbatim Jev-scored context reduction for Oh My Pi (omp), over TypeSafe or OpenRouter — drop stale tool payloads, keep dialogue intact.

Project pageView

Agent tooling

jev-antigravity-mcp

MCP proxy that routes System One evaluation tools (jev_evaluate, jev_choice, jev_noul, jev_score) to TypeSafe Jev.

Project pageView

Agent tooling

omp-jevify

Oh My Pi skill plugin: rubric-first bulk classification via judge_batch (Jev) for diffs, call sites, diagnostics, and more.

Project pageView

Browser & computer use

7.6k

Jev Ultrafast

Browser Use's ultrafast agent: Jev picks the operation and DOM element in one request; a small LLM only writes text when typing is needed.

CategoryView

Integrations

5.3k

eve

Vercel's open agent framework, which ships Jev as the default evaluation model in its experimental evaluate path.

CategoryView

Integrations

4.9k

agentgateway Jev guardrail example

Jev as an LLM prompt guardrail inside the agentgateway proxy, with tracing and cost tracking.

CategoryView

Agent tooling

fast-jev-compaction

Claude Code plugin that replaces the compaction summary with Jev decisions: every tool call and result is scored in one fast request, stale ones are dropped or truncated, everything kept stays verbatim.

CategoryView

Benchmarks & research

1.8k

SemIf

Semantic ifs from open models, on a 3090 at home. Independent; not affiliated with Jev or TypeSafe.

CategoryView

Applications

1.2k

jev-trader

One AI trade decision every Monad block. Jev on Kuru MON-USDC.

CategoryView

Benchmarks & research

959

jevlike

Train a small model that chooses among a changing list of text options, one probability per option in a single pass. Includes Doom, chess, and Wikispeedia demos.

CategoryView

Integrations

805

ai-cli

Vercel Labs terminal CLI that can run Jev as the evaluation model for its evaluate command.

CategoryView

Official

451

TypeSafe agent skills

Official agent skill for Claude Code, Codex, and compatible agents: primitives, patterns, and how to structure evaluations.

CategoryView

Browser & computer use

441

typesafe-computer-use

Computer use for about $0.0002 a step: OCR the screen, classify the next action with TypeSafe, click. macOS.

CategoryView

Integrations

367

pg-jev

Ask your Postgres tables questions in plain language. A PostgreSQL extension powered by TypeSafe's Jev.

CategoryView

Agent tooling

346

foreman

Software Factory Foreman: an agent supervisor that uses Jev decisions to keep coding agents on task.

CategoryView

Browse the rest by category

The full Jev AI tools catalog stays on category pages — not dumped into the home HTML. Pick a category to list projects, then open an on-site page when available.

Categories hub →

Official19

Open the full official list on its category page. Featured tools above already link to on-site project pages when published.

View 19 projects

SDKs & clients45

Open the full sdks & clients list on its category page. Featured tools above already link to on-site project pages when published.

View 45 projects

Integrations26

Open the full integrations list on its category page. Featured tools above already link to on-site project pages when published.

View 26 projects

Agent tooling107

Open the full agent tooling list on its category page. Featured tools above already link to on-site project pages when published.