Codex Skill Guide Running a Task 1. Do NOT specify a model by default. The Codex CLI is configured with a ChatGPT account, and explicit model flags ( , , ) all fail with "not supported when using Codex with a ChatGPT account." Omitting lets Codex use its default model, which works. Only add if the user explicitly requests a specific model. 2. Select the sandbox mode required for the task; default to unless edits or network access are necessary. 3. Assemble the command with the appropriate options: - - - - - (only if user explicitly requests) - (only if user explicitly requests) 4. Always use…