Jev ecosystem
A deliberately small directory of projects checked at their original repositories. JevHub does not rank these projects or treat inclusion as an endorsement.
Official
TypeSafe JavaScript SDK
Official TypeScript/JavaScript client for System One requests, including Choice, Score, and Noul builders with inferred answer types.
TypeSafe Python SDK
Official Python client for TypeSafe's System One API, useful when Jev decisions live in Python services or data pipelines.
System One Adapter (Python)
Official adapter that exposes a TypeSafeClient-compatible interface backed by chat-model providers for side-by-side workflow comparisons.
TypeSafe Agent Skills
Official agent skill material for using System One primitives and evaluation patterns from coding agents such as Codex and Claude Code.
SDKs
advocaat
A compact community client that wraps TypeSafe/Jev decisions behind a type-oriented developer API.
typesafe-ai (Rust)
Community Rust client for TypeSafe AI with typed request/response handling for System One workloads.
typesafe-sdk-go
Community Go SDK for the TypeSafe API, aimed at typed questions and probability-bearing answers in Go services.
typesafe-sdk-swift
Community Swift SDK for TypeSafe AI, providing a native path for Apple-platform applications to call System One.
Integrations
Vercel Eve
Vercel's open agent framework; its experimental evaluation path includes Jev as a decision/evaluation model option.
Vercel AI CLI
A Vercel Labs terminal tool whose evaluation workflow can use Jev as the evaluator.
zod-jev
Combines local Zod shape validation with Jev-powered semantic judgments so application code can validate structure and meaning separately.
zio-typesafe-ai
Scala 3 / ZIO integration for the System One API with typed multi-question calls.
Playgrounds
TypeSafeAI Community Playground
A large community playground exploring Jev patterns, workflows, routers, browser-agent experiments, and evaluation-oriented examples.
Jev Playground
A community playground focused on trying Jev primitives and inspecting structured outputs from a browser-oriented interface.
Agent / Tooling
Jev Ultrafast
Browser-use experiment where Jev selects browser operations and targets from a constrained action space while text generation is handled separately.
Foreman
Agent-supervision tooling that uses Jev-style decisions to help keep coding-agent workflows aligned with their current task.
jev-review
A community staged code-review workflow and local dashboard that uses Jev for bounded review decisions.
jev-mcp
An MCP server that exposes Jev judgments to coding-agent and MCP-client workflows.
jevwire
A decision layer for agents that combines an MCP surface, an embeddable library, and escalation-oriented integrations.
Agent Chaperone
Screens agent tool calls and tool results around the execution boundary, providing a useful example of semantic checks surrounding deterministic controls.
Canny
Open-source agent-completion tooling that focuses on evidence before accepting claims that a coding task is finished.
jev-router
Open-source LLM-routing project that uses Jev to select a model from a bounded catalog on top of LiteLLM.
Open Source / Research
Awesome Jev
A community-maintained, searchable directory of Jev projects that JevHub uses only as a discovery source before checking original projects.
SemIf
Independent research project exploring Jev-like semantic if-statements with open models; useful as evidence that the decision-model pattern extends beyond one provider.
How this directory is maintained
- Items must have a public, directly verifiable project URL.
- Descriptions are written by JevHub rather than copied from a list.
- No stars, ratings, or “best project” rankings are used in V0.1.
- V0.1 is manually curated; it does not automatically mirror another directory.
Want to learn the primitives first? Read What is Jev? or start from eight practical templates.