THE JEV GUIDE · CURATED EDITION

Developer tools.

Launch news, explanations, demos, and community projects around TypeSafe Jev, organized by topic. Every entry links back to its X source.

Curated selection · Not exhaustive · Updated manually

6757curated posts
3414original videos

New AI Pattern: Jev Tool Permissions

Introducing an AI pattern that automatically drops unneeded tools based on task description, keeping only what's needed from 30 tools, reducing tokens per turn. Built with AI SDK v7 and shadcn registry.

Gen UI Powered by Jev

Andreas Kruszakin-Liboska shares a generative UI app or demo powered by Jev, showcasing Jev's practical use in interface generation.

Jev model performs well on BANKING77 benchmark

Using the same pinned Jev version on 3,080 official BANKING77 test cases, accuracy reaches 80.75% without examples and 91.36% with all 2,446 labeled examples in context — 327 more correct, no weight updates, and only $10.92 of input tokens.

Jev model performs well on BANKING77 benchmark · original post image 1

TypeSafe Jev speeds up AI agent evals by ~50x

Datadog Developers highlights TypeSafe Jev's performance in AI agent evals: ~100ms, roughly 50x faster than GPT-5 nano at 5.6s; one call, multiple criteria, typed answers with probabilities, now in Datadog Agent Observability. Link

Jev: Typed decisions with confidence scores

Stop paying ChatGPT for a yes. Jev returns typed decisions with a confidence score, and output tokens cost $0. A cheaper fit for yes/no calls in your app.

Jev routes prompts for Claude Code

A developer places Jev as a router in front of Claude Code. Each decision costs about $0.00002, routing prompts to the smallest capable model among Haiku, Sonnet, and Opus, cutting costs while managing latency.

Decision Comparison Test: Jev vs Decisions API

UHIYAMA plans to replace the decision-making part with the Decisions API for validation in talk avatar development, comparing judgment differences. If there are no differences, a full replacement may be considered. The current decision cost is about $0.2 per conversation hour, which could be absorbed by distribution credits.

Video frame from the original post: Decision Comparison Test: Jev vs Decisions API

AI/ML API Launches Jev Router Powered by TypeSafe's Jev

Jev Router is an MCP connector for agentic tools that uses TypeSafe's Jev to rate each request's difficulty and automatically select the right model and tool: easy requests go to light models, while hard reasoning goes to more capable models. Link