second-opinion

Automatically initiates Codex review sessions in tmux for implementation plans and significant code changes. Use this skill proactively when: (1) Exiting plan mode with a completed implementation plan, (2) Making substantial code changes that would benefit from peer review (multi-file refactors, architectural changes, complex features), (3) User explicitly requests Codex review. The skill manages tmux panes, polls for Codex responses, iterates on feedback, and closes the session when review is complete.