OpenAI Codex CLI brings the Codex coding agent to the terminal and to scripts. Instead of switching to an editor plugin or a browser, a developer runs it from the command line inside a project directory, describes a task in plain language, and lets the agent read the code, propose edits and run commands. It is part of the OpenAI developer documentation, which also covers SDKs, the Responses API, agents and tools for building with models.
Codex CLI is for software developers who already live in a shell: backend engineers, DevOps and platform staff, and open-source maintainers who prefer keyboard-driven workflows. Because it runs from the terminal, it fits people working over SSH or inside containers, where a graphical editor is awkward. Engineers who automate repetitive repository tasks can also call it from scripts, which suits build pipelines and one-off maintenance jobs. Beginners can use plain-language prompts, though comfort with git and the command line helps.
Typical use cases include asking the agent to explain an unfamiliar codebase, fix a failing test, write a small feature, refactor a module, or generate a migration. Developers run it in a repository, review the proposed changes as diffs, and then accept or adjust them. Scripts can invoke it for batch jobs such as updating configuration files across many projects or drafting documentation. It pairs naturally with version control, so each change can be inspected and reverted. Teams building their own agents can compare it with the SDKs and Agents tools in the same documentation.
