Hollow Creek

A living-world RPG whose NPCs are decided by TypeSafe's Jev judge model; code owns rules, numbers and state.

Snake controlled by parallel Jev assessments, with one API call per game tick.

Snake auto-played by TypeSafe's Jev model: one System One choice per tick, legal moves and facts generated in code

Semantic decisions as ordinary Ruby — feels?, decide, score, Rails validations and pattern matching powered by Jev

Score how well a resume matches a job description using Jev (TypeSafe AI). Next.js app that returns typed, explainable match scores instead of generated text.

Guardrails for Pi built on pi-typesafe that steer the agent instead of interrupting you: Jev judges irreversible and off-task tool calls, detects stuck loops, checks unverified done claims, flags slop

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

Using Jev as an evaluator.

An input that becomes what you mean: one text box that morphs into the right UI as you type. Powered by TypeSafe Jev, works offline.