Codex Orchestrator: Astra/Sol Orchestrator with Luna Subagents

Melvin Vivas · X post · 2026-09-07 · Open on X

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

Summary

Melvin Vivas updated his open-source setup script for running multiple agents in Codex. Astra or Sol acts as the orchestrator and Luna runs the subagents. A new option for Codex Plus users makes the orchestrator default to Luna max, so you avoid burning scarce Astra credits.

Key points

• Pattern: use a stronger model (Astra or Sol) as the orchestrator and a cheaper model (Luna) for worker subagents.
• On the Plus plan, the orchestrator now defaults to Luna max to save usage limits.
• For pure Luna execution, you also have to change the reviewer agent to Luna.
• The setup script in the repo has been updated with the Plus option.

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

• If you're on Codex Plus and want pure Luna execution, change the reviewer to Luna too.
• Re-run the updated setup script from the repo.
• Set up a Codex orchestrator/worker/reviewer agent system that mixes expensive and cheap models to manage cost.