How to Use Codex Builder from Other Agents

Codex Builder is a specialized tool that takes implementation plans (generated by Claude Code's plan mode or claude-planner skill) and delegates the actual implementation to Codex CLI. When you have a detailed plan and want Codex to autonomously implement it, use this skill.

⚠️ Important: Execution Time Notice

Codex Builder typically takes 5-20 minutes to complete, depending on plan complexity, number of files, and implementation scope. During execution:

• The terminal may appear frozen with no output - this is normal
• Do NOT interrupt or terminate the process
• Codex is actively working in the background, reading files, writing code, and implementing the plan
• Use --verbose flag to see real-time progress if you need reassurance
• Be patient - autonomous implementation requires time for careful coding and testing
• Larger plans (10+ steps) may take 15-20 minutes or more

If you interrupt the process thinking it's stuck, you'll lose all progress and may end up with partially-implemented changes.

When to Use Codex Builder