How to Maximize Codex Exec Command

The `codex exec` command allows a coding agent to run a separate, isolated instance of Codex to complete a specific task. This is particularly effective for creating a model ensemble where one agent, like Claude Code, handles implementation while `codex exec` is used to trigger Codex for code reviews. Using Codex as a reviewer improves code quality by catching more bugs with higher precision than using the same model for both writing and reviewing. The technique can also be applied to review implementation plans or get a second opinion on architectural decisions, creating a more robust multi-agent coding system.