Using Jev (TypeSafe AI) as a Decision Model for Email Classification

Melvin Vivas · X post · 2026-09-30 · Open on X

Topics: AI Agents, Tool Use & MCP, Portfolio Projects · Level: intermediate

Summary

The post shares a blog article from AIBackends on using Jev, a tool by TypeSafe AI, as a decision model for classifying emails. The post itself has no further detail, so the lesson is in the linked article.

Key points

• Jev, made by TypeSafe AI (@typesafeai), can act as a decision model for classification tasks.
• Worked example: email classification.
• The full walkthrough is in the AIBackends blog post 'How to Use Jev as a Decision Model for Email Classification'.
• A shortened link in the post (aibackends.com/blog/email-cla) is broken. Use the full blog URL instead.

Resources mentioned

• How to Use Jev as a Decision Model for Email Classification (AIBackends blog) · article · aibackends.com · free
  Blog post explaining how to use Jev as a decision model to classify emails.
• TypeSafe AI (@typesafeai) on X · person · x.com · free
  The X account of TypeSafe AI, the company that makes Jev and the System One models.
  Also in: Building a Jev Session-History Tool with Codex and Astra (Melvin Vivas on X · notes), Not every problem needs an LLM: small fine-tuned models (Jev by TypeSafe AI) (Melvin Vivas on X · notes), Jev model added to the AIBackends API via Vercel AI Gateway (Melvin Vivas on X · notes), AIBackends: An API Layer Between Your App and AI Models (Now with Jev) (Melvin Vivas on X · notes) and 6 more
• Jev · tool · typesafe.ai · paid
  A decision model that makes turn-level forecasts on AI agent conversations using only structural signals (turns, tool calls, workflow stages, timing).
  Also in: Generating a Repo Promo Video with a Claude Skill on Sonnet 5.5 vs Opus 5.5 (Melvin Vivas on X · notes), GLiDE by Fastino Labs: A Post-Trainable Reasoning Decision Model (Melvin Vivas on X · notes), Using Jev as a Reranker to Augment RAG Retrieval (Melvin Vivas on X · notes), Jev Decision Model: Forecasting AI Receptionist Calls from Structure Alone (Melvin Vivas on X · notes) and 12 more

Try this

• Read the AIBackends blog post on email classification with Jev.
• Build an email classifier that uses Jev as the decision model.