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Use when the user asks to run Codex CLI (codex exec, codex resume) or references OpenAI Codex for code analysis, refactoring, or automated editing

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SKILL.md

name: codex description: Use when the user asks to run Codex CLI (codex exec, codex resume) or references OpenAI Codex for code analysis, refactoring, or automated editing

Codex Skill Guide

Running a Task

  1. Ask the user (via AskUserQuestion) which model to run: gpt-5 or gpt-5-codex.
  2. Ask the user (via AskUserQuestion) which reasoning effort to use: low, medium, or high.
  3. Select the sandbox mode required for the task; default to --sandbox read-only unless edits or network access are necessary.
  4. Assemble the command with the appropriate options:
    • -m, --model <MODEL>
    • --config model_reasoning_effort="<low|medium|high>"
    • --sandbox <read-only|workspace-write|danger-full-access>
    • --full-auto
    • -C, --cd <DIR>
    • --skip-git-repo-check
  5. When continuing a previous session, use codex exec resume --last via stdin. IMPORTANT: When resuming, you CANNOT specify model, reasoning effort, or other flags—the session retains all settings from the original run. Resume syntax: echo "your prompt here" | codex exec resume --last
  6. Run the command, capture stdout/stderr, and summarize the outcome for the user.

Quick Reference

Use case Sandbox mode Key flags
Read-only review or analysis read-only --sandbox read-only
Apply local edits workspace-write --sandbox workspace-write --full-auto
Permit network or broad access danger-full-access --sandbox danger-full-access --full-auto
Resume recent session Inherited from original echo "prompt" | codex exec resume --last (no flags allowed)
Run from another directory Match task needs -C <DIR> plus other flags

Following Up

  • After every codex command, immediately use AskUserQuestion to confirm next steps, collect clarifications, or decide whether to resume with codex exec resume --last.
  • When resuming, pipe the new prompt via stdin: echo "new prompt" | codex exec resume --last. The resumed session automatically uses the same model, reasoning effort, and sandbox mode from the original session.
  • Restate the chosen model, reasoning effort, and sandbox mode when proposing follow-up actions.

Error Handling

  • Stop and report failures whenever codex --version or a codex exec command exits non-zero; request direction before retrying.
  • Before you use high-impact flags (--full-auto, --sandbox danger-full-access, --skip-git-repo-check) ask the user for permission using AskUserQuestion unless it was already given.
  • When output includes warnings or partial results, summarize them and ask how to adjust using AskUserQuestion.