30 projects · updated 2 November 2026
Decision models in Ruby, Elixir and beyond
Libraries that make a typed decision feel native to a language: pattern matching on an answer in Elixir, a probabilistic if in Ruby, a typed method via BAML.
29 of these 30 call the hosted API rather than running open weights.
openai-scala-client257 ★cequence-ioScala client for OpenAI API and other major LLM providerspi-warden177 ★DevMortimerGuardrails for Pi that steer instead of interrupt: enforces your project rules on every write, holds only hard-to-undo actions (3 per 1,000 calls, measured on real sessions), catches unverified "done" claims and stuck loops, and trims tool output. Built on pi-typesafe.pi-jev165 ★y0usafTypeSafe Jev as a decision layer for the Pi coding agent: a measured tool-call gate plus jev_ask for typed, calibrated answersneurolink157 ★juspayThe pipe layer of an AI nervous system — one interface connecting provider neurons to your application, across three inference types: generate, stream, and a calibrated decide (via TypeSafe Jev). MCP-native, voice (TTS/STT/realtime), RAG, memory, file processors. Powers Tara, Yama and Clairvoyance at Juspay.Jev140 ★cobusgreylingUnofficial TypeSafe Jev showcase — System One decisions, not chat.system-one-foundation-models124 ★peterfrieseA lightweight, native Swift 6 bridge integrating TypeSafe AI's Jev System One decision model into Apple's Foundation Models framework.laya-php110 ★marcreichelClassify text in PHP without an LLM bill: typed decisions in 100+ languages, self-hosted. Laravel-ready SDK for Laya, a Jev AI alternative.laya-server110 ★1Panel-devA self-hosted API and web interface for Laya’s structured decision models, compatible with the TypeSafe Jev API format.advocaat101 ★pithingsA small, type-safe client for asking AI questions about your data, powered by TypeSafe Jev.GoEventBus75 ★Protocol-LatticeGoEventBus — high-performance event bus with a decision layer.system-one75 ★iamaamirProvider-neutral System One runtime for TypeScript and Pijev-playground73 ★mizchiTypeSafe AI の System One モデル Jev を MoonBit から触るためのプレイグラウンド。 Jev は「文字列ではなく型付きの確率判断を返す」意思決定専用モデルです(unstructured state in, typed probspring-ai-typesafe62 ★spring-ai-communityA Java SDK for the TypeSafe AI JEV API, & Spring AI TypeSafe integrations.ruby_decision_model59 ★obieRuby client for decision models such as Typesafe Jevgo-jev46 ★mattnGo SDK and CLI for TypeSafe Jev: typed decisions (yes/no, choice, score) from a modelAnyDecisionModel46 ★matttA Swift package for typed decisions from language models (probabilities, choices, and scores), with support for local MLX models and the TypeSafe Jev API.jev37 ★dannoteTypeSafe Jev for OTP: reply to Jev from a GenServer and pattern match on its answercookbook30 ★Jev-EngineeringSixty notebook recipes for typed decisions with Jev: Choice, Noul and Score patterns from a first classification to closed-loop controljev-usecases27 ★kenhuangusProduction TypeSafe Jev (System One) use-case harnesses with confidence-gated decision logicfeelings24 ★BoundaryML.feels() on anything — the AI if statement as a real, typed method. Jev + BAML.jev-recipes24 ★agencyenterprise248 small Jev decisions for JavaScript and TypeScript: route, rerank, gate, grade, compare, and label text for agents, RAG, support, code review, and music. Each returns a typed result with explicit uncertainty. Plug into Vercel AI SDK or LangChain agents, import one recipe, or run the CLI with JSON from any language.jev-cli22 ★Nasrallah-ALCommand-line tool for TypeSafe's Jev AI modelhunch20 ★carldawsProbabilistic control flow for Ruby and Rails - powered by TypeSafe's Jevjevalyn20 ★Ray-HughesThe decision layer for your Rails app. A Rails-native wrapper around TypeSafe's Jev System One API: typed, calibrated decisions in your control flow.jevper19 ★zhulinchngJev-shaped (TypeSafe System One) classification wrapper over OpenAI-like clientstypesafeai-dotnet-sdk12 ★saibimajdiCommunity .NET SDK for the TypeSafe AI System One API — typed noul, choice, and score questions with structured, confidence-scored answers. Not affiliated with TypeSafe AI.typesafe-sdk-java12 ★Premo-CloudCommunity Java SDK for Jev, TypeSafe's System One model: typed questions in, typed answers with calibrated probabilities out. Java 17+, Spring Boot starter (unofficial)Jev11 ★dfinkePowerShell decisions with TypeSafe AI's Jev model: https://typesafe.ai/blog/introducing-system-one-models-and-jevSwiftJev10 ★SoundBlasterSwift framework to access Jev System One model by TypeSafe.aijev_elixir10 ★Elue-devjev_elixir is a small, idiomatic interface for making typed decisions with Jev. It exposes application-level functions such as Jev.ask?/2 and Jev.analyze/3, while provider adapters handle the external API wire format. The first release supports TypeSafe's System One API and OpenRouter's Decisions API. Both providers support all three System One qu
Other things people build
Developer tooling 84
Code review gates, CI checks, agent harnesses and editor plugins. The densest cluster in the ecosystem, because a coding agent makes hundreds of small decisions per session and each one costs something.
Open reimplementations 80
People rebuilding the category from open weights: one-pass scorers, constrained decoding over local models, and small models trained to return a calibrated distribution. The fastest-moving cluster here.
Agents 30
Tool selection, routing and step gating. An agent choosing its next action is the purest version of the problem this class of model exists for.
Browser 22
Extensions and automation that judge pages: what to hide, what to click, what is worth reading. Latency matters here in a way it does not on a server.
Find out what your data actually supports
We turn your historical decisions into a frozen test set, then tell you which model, which threshold, and how much of it you can safely automate.