Running Six Codex Accounts, Claude Code, and Antigravity on One Mac

I run six Codex accounts using gpt 6.1 sol, alongside Claude Code, Antigravity, and Cursor. Each has a separate macOS user, with the users connected through an ai group. My live trading code has hard read only protections against the coding agents. The more useful story is about operating systems and coordination, not only about models. Account identity should stay separate from task identity. The shared group should have a narrow purpose. Work should be divided by interfaces, with an explicit integration owner for each task. Separate checkouts help prevent agents from changing the same uncommitted files, but they should not be confused with security. Handoffs should carry inspectable evidence, including changed files, checks performed, and unresolved assumptions. Availability tracking is not a capacity promise. More concurrent sessions can produce more candidate work than can be comfortably inspected, so the review queue should limit active implementation.