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.
Follow the repository instructions for this skill and your agent. Review the files and dependencies before adding it to your workflow.
SkillHub CLI
skillhub install feiskyer/codex-skillInspect the source and compatibility requirements, then follow its installation steps.
Give your agent the source link and ask it to inspect instructions and dependencies before explaining the installation steps.
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):
# Via OpenClaw exec — use background=true + pty=true, NO hard timeout
# pty=true ensures codex CLI flushes output properly (no buffering issues)
# (hard timeout kills the process; instead we poll and extend)
exec(command="codex exec --full-auto 'fix the typo in README.md'",
workdir="/path/to/project", background=true, pty=true)
# With high reasoning
exec(command="codex exec -c 'model_reasoning_effort=high' --full-auto 'fix the auth bug'",
workdir="/path/to/project", background=true, pty=true)
```...
These signals come from indexed source analysis and may lag behind changes. Check the current source files.
# Codex Agent Skill
Operate Codex CLI as a **managed coding agent** — from worktree setup through PR merge.
## Prerequisites
```bash
codex --version # Verify installed
# Install: npm i -g @openai/codex or brew install codex
tmux -V # tmux required for full workflow
```
## CLI Quick Reference
| 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 |
---
## Execution Modes
### Quick Mode — Small Tasks
For trivial fixes, one-file changes, or analysis. Use `exec` (non-interactive):
```bash
# Via OpenClaw exec — use background=true + pty=true, NO hard timeout
# pty=true ensures codex CLI flushes output properly (no buffering issues)
# (hard timeout kills the process; instead we poll and extend)
exec(command="codex exec --full-auto 'fix the typo in README.md'",
workdir="/path/to/project", background=true, pty=true)
# With high reasoning
exec(command="codex exec -c 'model_reasoning_effort=high' --full-auto 'fix the auth bug'",
workdir="/path/to/project", background=true, pty=true)
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Agents can sign plugins, rotate credentials without losing identity, and publicly attest to behavior.
Send and receive P2P messages using disposable numbers and PINs. No servers, no accounts. Use for human notifications, approval flows, and agent-to-agent communication.