Coworker Design: Every Agent Capability Is a Skill

Melvin Vivas · X post · 2026-08-26 · Open on X

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

Summary

The creator explains that in his Coworker desktop agent app, every capability is built as a Skill. This is a modular way to design agents, where new abilities are added as separate skill packages rather than hard-coded features.

Key points

• Coworker builds every agent capability as a 'Skill'.
• Treating capabilities as skills keeps an agent modular and easy to extend.

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