Codex Execution Skill

Prerequisites

• Codex CLI installed and configured (~/.codex/config.toml)
• Verify availability: codex --version on first use per session

Workflow Checklist

For every Codex task, follow this sequence:

1. ☐ Detect HPC/Slurm environment:

   • Check if running on HPC cluster (look for /home/woody/, /home/hpc/, Slurm env vars)
   • If HPC detected: Always use --yolo flag to bypass Landlock sandbox restrictions

2. ☐ Ask user for execution parameters via AskUserQuestion (single prompt):

   • Model: gpt-5, gpt-5-codex, or default
   • Reasoning effort: minimal, low, medium, high

3. ☐ Determine sandbox mode based on task: