OpenAI Codex CLI

Codex CLI is OpenAI's official terminal coding agent, built in Rust for speed. It reads, modifies, and runs code locally, with support for multi-agent parallel execution via git worktrees. Features include web search integration, MCP server support, a hooks system for enterprise workflows, and subagent spawning for parallel tasks. Included with ChatGPT Plus/Pro/Business/Enterprise plans or usable with an API key.