codex-playbooklisted

# Codex Playbook `codex` is OpenAI's coding agent CLI. Its distinguishing feature for Skill Heaven is strong **isolation**: config, session persistence, and the writable filesystem are each independently suppressible from the command line, so a clean posture composes without mutating anything. Verified against **codex-cli 0.146.0**. Re-check `codex --version` before trusting any dose measurement. > **Rule 0 — run codex in a herdr pane, never through your Bash tool.** The operator must be > able to see which model and reasoning effort you invoked. A probe the operator could not see is > not evidence. Use `pane send-text` with a trailing newline **inside** the quotes — **not** > `pane run`, which splits argv on whitespace and destroys quoted prompts: > > ```bash > herdr pane send-text "$PROBE_PANE" 'codex exec --model gpt-5.6-luna -c model_reasoning_effort=low "probe text" > ' > herdr pane read "$PROBE_PANE" > ``` > **Building the door?** Read `packages/core/skills/harness-door-pattern/SKILL.md` first — it > carries the suppression-mechanism taxonomy, the probe methodology, and the traps. This playbook > is the harness-specific detail underneath it. --- ## 1. Non-interactive invocation ```bash codex exec "your prompt" codex exec --skip-git-repo-check --ephemeral --sandbox read-only "your prompt" ``` `codex exec` is the non-interactive entrypoint. A prompt can be passed as an argument or piped on stdin; if both, stdin is appended as a `<stdin>` block. Flags worth defaul