Codex

Use print mode with the -p flag, which runs a one-shot task and exits without interactive prompts. Combine it with --allowedTools to restrict capabilities and --max-turns to prevent runaway loops, making it suitable for CI/CD pipelines.

Send keystrokes with tmux send-keys to answer the workspace trust dialog (press Enter for the default Yes) and the permissions bypass dialog (press Down then Enter to select Yes, I accept). The trust dialog only appears on first visit to a directory.

Yes, use --output-format json to get a result object containing session_id, num_turns, total_cost_usd, and the result text. Add --json-schema to force output matching a specific schema, or stream-json for real-time newline-delimited events.

Capture the session_id from JSON output, then pass it with --resume to continue that conversation. Use --continue to resume the most recent session in the current directory, or add --fork-session to branch with a new ID while keeping history.

Set --max-turns to cap agentic loops and --max-budget-usd to cap spend in print mode. Use --effort low for simple tasks and --fallback-model haiku to switch models when the default is overloaded.

Use print mode for one-shot tasks, CI automation, and piped input processing since it skips all interactive dialogs. Use tmux interactive mode for multi-turn iterative work, slash commands like /compact and /review, and exploratory sessions needing human decisions.