Wrap the local codex CLI (codex --version ≥ 0.128.0) so Claude Code can hand off three kinds of work without leaving the conversation:

review — second-opinion code review on a diff
impl — non-interactive coding task in a sandbox
image — image generation via Codex's built-in image_gen.imagegen tool (no API key, ChatGPT login is enough)

Verify once per session

codex --version          # codex-cli ≥ 0.128.0
codex login status       # must say "Logged in"

If not logged in, tell the user to run ! codex login from the prompt. Do not log in on their behalf.

Pick the mode

Parse $ARGUMENTS. The first token selects the mode (review | impl | image); everything after it is the prompt or flags. If the user invoked /codex-cli with no subcommand, infer: