20 open-source JEV projects: browser agent books a flight in 7.1 seconds
anselm · x · 2026-09-24
An X thread rounds up 20 open-source projects built on TypeSafe's JEV, spanning browser automation and agent infrastructure:
- Jev-Ultrafast (by browser-use, 19.3k GitHub stars): a browser agent with a dynamic, indexed action space. Each observation yields an element table; the model only generates text for TYPETEXT while otherwise just picking operations (CLICK/SELECT/SCROLL). Demo: Zurich → London booked on Google Flights in 7.1 seconds.
- Other projects: Fast-JEV-Compaction (context compression), JSON-Render (generative UI), Typesafe-MCP (any MCP client), JEV-MCP (judgment toolkit), Semdecide (CLI classifier), JEV-Codex-Router (model routing), Winnow (context garbage collection), JEV-Review (code review triage), Blink (repo navigator), Agent-Desktop (desktop automation), Typesafe-Mario (plays Super Mario), JEV-Drone (drone control), and more.
Overall it shows the JEV pattern — a small model picks operations, text generation only when needed — spreading across browser, desktop, coding, and routing use cases.
Related event: Roundup: 20 Open-Source Projects Built on JEV(2 posts)→
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