Coworker: Open-Source Desktop App for AI Agents, with Jev

Melvin Vivas · X post · 2026-09-17 · Open on X

Topics: AI Agents, Tool Use & MCP, AI Dev Tools & Productivity · Level: beginner

Summary

The creator links his open-source Coworker app, a desktop app where AI agents do work for you using local or cloud models. He says TypeSafe AI's Jev would be a good fit for it.

Key points

• Coworker is an open-source desktop app where AI agents do tasks for the user.
• It supports both local and cloud models.
• The creator plans to add Jev by TypeSafe AI to Coworker.

Resources mentioned

• Coworker (donvito/coworker) · repo · github.com · free
  The creator's local-first desktop app where you pick an AI coworker and have it produce work such as invoices as finished PDFs.
  Also in: Claude Opus 5.5 for Video Making: Creator's Showcase Thread (Coworker) (Melvin Vivas on X · notes), Coworker: free open-source desktop AI coworker app (Melvin Vivas on X · notes), Coworker: Open-Source Desktop App for AI Agents (Melvin Vivas on X · notes), Using Devin AI to Test the Coworker Desktop App on Windows (Melvin Vivas on X · notes) and 38 more
• 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: Using Jev (TypeSafe AI) as a Decision Model for Email Classification (Melvin Vivas on X · notes), 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) and 6 more
• Jev (TypeSafe AI) · tool · typesafe.ai · free
  TypeSafe's new post-training algorithm for calibrated, confidence-scored decisions, pitched as a replacement for RLHF.
  Also in: JevDev: Open-Source UI Tool for Experimenting with Jev (Typesafe.ai) (Melvin Vivas on X · notes), jev-dev: A UI Tool to Keep Run History When Experimenting with Jev (Melvin Vivas on X · notes), JevDev: Open-Source UI for Experimenting with Jev by Typesafe.ai (Melvin Vivas on X · notes), Building a Jev Session-History Tool with Codex and Astra (Melvin Vivas on X · notes) and 7 more