Single-Agent Codex Astra xhigh Usage for a Feature Build

Melvin Vivas · X post · 2026-09-10 · Open on X

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

Summary

Melvin Vivas shares his Codex usage for building one Coworker feature with a single Astra agent at xhigh, working step by step with no subagents. He warns that codebase size and complexity change the numbers, so treat them with caution.

Key points

• Setup: one Astra agent at xhigh, working step by step, with no subagents.
• Task: adding a feature to an existing app (Coworker).
• Usage depends on codebase size and complexity, so other people's numbers don't transfer directly.
• Treat shared token-usage numbers with a grain of salt.

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

Try this

• Compare usage numbers against your own codebase instead of copying other people's numbers.