A Codex setup with Astra as architect and Sol writing the code
A multi-agent Codex configuration where Sol writes all the code and Astra is only called to review before planning, when the same error repeats, and before finishing, with a prompt you can paste in directly.
Codex tip: once GPT-6.1 Sol is your main model, stop running Astra on every turn keep Astra on call as an architect agent Sol writes every line of code Astra gets spawned at exactly three moments: -> before a plan: is this even the right approach? -> when the same error returns: am I digging in the wrong spot? -> before "done": what did I skip? Astra reviews. Sol ships Jev engineering does the same thing one layer lower: forks that need no thinker (which file, which tool, retry or stop) go to Jev in under half a second, and the big models only see the forks that actually split the full tree: > GPT-6.1 Sol on high runs the main session > explorer reads the code on Luna > worker edits and runs tests on Sol > researcher pulls the docs on Luna > all three on medium > Astra on call as the architect > auto_review checks every approval paste the tree and this prompt into Codex 👇 "Rebuild my Codex setup around this tree. 1. Agents - scan ~/.codex/agents and .codex/agents for anything that already fits explorer, worker or researcher - draft TOML only for missing roles: explorer and researcher on gpt-6-luna, worker on gpt-6.1-sol, all at model_reasoning_effort medium - explorer and researcher get a read-only sandbox, only worker can write - skip agents pinned to another model and list them 2. Architect - add an architect on gpt-6-astra, model_reasoning_effort high, read-only sandbox - its only jobs: review plans, repeated errors and finished work - feed it the plan, the diff and the failing log, never the full transcript - force one output shape: verdict (proceed / revise / stop), top 3 risks, one cheaper path, under 200 words - cap it at 3 calls per task 3. Main config - in ~/.codex/config.toml set model to gpt-6.1-sol, model_reasoning_effort to high, approvals_reviewer to auto_review 4. Overrides - find anything that would beat this: active profiles, flags in shell aliases, agents.default_subagent_model - report it, change nothing 5. Rules - add to the AGENTS file in the repo root: spawn the architect before a large plan, when the same error signature shows up twice, and before calling a long task done - log every architect call with its trigger and verdict to .codex/architect-log.jsonl Check that every TOML file parses, then show me all changes as one diff. No edits until I say go." ↳ https://developers.openai.com/codex/subagents
This post quotes another post: x.com/polydao/status/2104783226833186920