Also called: CLI
A command-line interface (CLI) is a way to operate software by typing text commands in a terminal instead of clicking through screens, which makes a tool easy for a coding agent to drive directly.
A CLI is one of the plainest ways to make a tool "agent-ready": it can be driven headlessly, through an API, a CLI, an MCP server, or webhooks, so a coding agent can operate it without a human clicking through a UI. A CLI turns every action a tool can do into a command a script, or an agent, can issue directly, the same commands a person would type by hand.
The clearest example of a CLI on this site's own stack is Claude Code itself: an agentic coding tool that runs in a terminal, not a chatbot someone pastes questions into. It reads files, calls APIs, writes and runs code, and chains a dozen actions in a row without needing the context re-explained each time. That's what a CLI buys an agent-driven workflow: the tool becomes something a session can operate directly instead of something a person has to click through.
A tool with a real CLI can sit inside an agent loop the same way a human operator would use it, just triggered by a script or an agent session instead of a mouse. That's a meaningfully different bar than a tool that only ships a UI and calls itself developer-friendly because it has decent keyboard shortcuts.
A CLI gets conflated with an API, but they're not the same door. An API is built for a program to call over a network; a CLI is built for a terminal session, human or agent, and often wraps calls to that same API underneath. A tool can have one without the other, and a stack that only has a UI has neither.
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