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OpenAI Codex CLI in Depth

Codex is OpenAI's agentic coding tool for the terminal — the same category of tool as Claude Code. This deep dive covers the whole surface: installing and signing in, driving it interactively versus headless in CI with codex exec, resuming sessions, the slash commands, the approval and sandbox model that decides what it may touch, the AGENTS.md project file, ~/.codex/config.toml, MCP, and the cloud. Every command here is copy-pasteable, and a mapping table translates what you already know from Claude Code into Codex.