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Get Started Free →codex-skill
Use when user asks to leverage codex, gpt-5, or gpt-5.1 to implement something (usually implement a plan or feature designed by Claude). Provides non-interactive automation mode for hands-off task execution without approval prompts.
Passed 13 of 19 test cases with the skill, and 1 of 19 without it.
14 fixed1 passed either way7 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
The instructions your model reads when the skill loads.
Operate Codex CLI as a managed coding agent — from worktree setup through PR merge.
codex --version # Verify installed
# Install: npm i -g @openai/codex or brew install codex
tmux -V # tmux required for full workflow
| Flag | Effect |
|---|---|
exec "prompt" | Non-interactive one-shot, exits when done |
--full-auto | Alias for -s workspace-write (auto-approve file edits) |
-s workspace-write | Read + write files in workspace |
-s read-only | Analysis only, no modifications (default for exec) |
-s danger-full-access | Full access including network and system |
--dangerously-bypass-approvals-and-sandbox | Skip all prompts + no sandbox (safe in containers/VMs) |
-m <model> | Model selection — only use when user explicitly requests a model (e.g. gpt-5.1-codex-max). Omit to use Codex default. |
-c "model_reasoning_effort=high" | Reasoning effort: low, medium, high |
--json | Structured JSON Lines output |
-o <file> | Write final output to file |
-C <dir> / --cd <dir> | Set working directory |
--add-dir <dir> | Allow writing to additional directories |
--skip-git-repo-check | Run in non-git directories |
resume --last | Resume last session with new prompt |
For trivial fixes, one-file changes, or analysis. Use exec (non-interactive):
test cases passed, vs 1 / 19 without
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