codex-cli
Codex CLI
OpenAI's local agentic coding CLI (codex, v0.132+). Runs the GPT-5 family by default (current default: gpt-5.5) and supports OSS providers (ollama, lmstudio). Use for second-opinion audits, delegated builds, review of uncommitted diffs, and non-interactive task execution.
First: prefer the Codex Claude Code plugin when it's installed
If the user has the official openai-codex plugin in ~/.claude/plugins/marketplaces/openai-codex/, the plugin's skills are the preferred path for Claude→Codex delegation:
| Plugin skill | Use for |
|---|---|
codex:setup |
Check Codex is installed, configured, and ready |
codex:rescue |
Delegate a rescue/fix/diagnosis/research task to Codex |
codex:codex-result-handling |
Internal — how to present Codex output back to the user |
codex:gpt-5-4-prompting |
Internal — prompt drafting for Codex |
The plugin wraps codex with a task runner that handles background execution, model/effort routing, write-vs-read, and result fetching. Hand-rolling codex exec from Bash is fine for direct CLI work (e.g. the user explicitly types codex … or wants a one-off review), but for "delegate this to Codex" requests, prefer codex:rescue. Don't double-invoke.
Detect with: ls ~/.claude/plugins/marketplaces/openai-codex/ 2>/dev/null