#Codex Advanced Tips

This chapter collects practical techniques for larger or more complex Codex work.

#1. Manage The Context Window

Keep the active context focused. Link to files and references that matter, and avoid dumping unrelated material.

#2. Checkpoints And Undo

Use Git commits, app checkpoints, or small reviewable steps before risky edits.

#3. Resume And Fork Sessions (CLI)

Resume a previous session when continuing the same work. Fork when you want an alternate approach without losing the original thread.

#4. @ Mentions And Images

Use @ mentions to attach relevant files, screenshots, connectors, or context sources.

#5. Memories

Durable preferences belong in project or user instructions, not repeated in every prompt.

#6. Parallel Work

Run independent investigations, reviews, or implementation paths in separate threads or worktrees.

#7. Debug Agent Behavior

When Codex behaves unexpectedly, inspect loaded instructions, permissions, logs, and recent tool output.

#8. Make It Think Before Acting

For risky tasks, ask Codex to inspect and summarize before editing. This is especially useful in unfamiliar repos.

#9. Save Time And Cost

Use smaller models and lower effort for routine work. Reserve stronger settings for tasks that need deeper reasoning.

#Next Steps

Continue with IDE Extension.