Codex setup: Astra orchestrator with Luna subagents

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

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

Summary

The creator shares a GitHub repo that sets up Codex so a large model (Astra or Sol) orchestrates and smaller Luna models run as subagents. He invites people to fork it and share their own setups.

Key points

• Pattern: a strong model (Astra or Sol) plans and coordinates.
• Narrower tasks go to cheaper Luna subagents.
• This lowers cost and helps you stay under usage limits.
• The repo is meant to be forked and adapted to your own setup.

Resources mentioned

• donvito/codex-astra-luna-orchestrator · repo · github.com · free
  The creator's Codex skill for an orchestrator-plus-subagents setup (Astra orchestrator, Luna subagents), configured through config.toml.
  Also in: Codex Orchestrator Pattern: Astra/Sol Orchestrator with Luna Subagents (Melvin Vivas on X · notes), Open-source Codex skill: Astra/Sol orchestrator with Luna subagents (Melvin Vivas on X · notes), Cost-Efficient Codex Subagents: Astra/Sol Orchestrator + Luna Workers (Melvin Vivas on X · notes), Codex Orchestrator v0.2.1: GPT-6 Sol orchestrator with Luna subagents (Melvin Vivas on X · notes) and 27 more
• OpenAI Codex · tool · openai.com · paid
  OpenAI's coding agent. In the diagram it writes code, fixes review findings and drives the build loop. The creator also used it to make this video.
  Also in: An agent bot that installs and drives Codex on its own (Melvin Vivas on X · notes), Asking a Coder bot to install Codex (Melvin Vivas on X · notes), Sign in with ChatGPT: Setting Usage Limits for Each App (Melvin Vivas on X · notes), Codex Cloud Environments Must Be Saved & Published Before Use (Melvin Vivas on X · notes) and 240 more

Try this

• Fork the repo and adapt the orchestrator/subagent setup.
• Share your own Codex setup.
• Set up a multi-agent Codex workflow with a large model for planning and small models for subtasks.