Getting started with the CircleCI CLI

CircleCI’s v1 CLI brings CI workflows into developers’ terminals and enables coding agents to interact with projects through shell commands or a built-in Model Context Protocol server. After installation, authentication, and project onboarding, users can monitor and trigger pipeline runs, inspect structured JSON output, retrieve condensed failure reports, access test results, logs, and artifacts, validate configuration files, and rerun failed workflow jobs. A deliberately faulty Node.js demo project illustrates how the CLI can identify a version-comparison bug, trace it through failed tests and generated artifacts, and support validation of a subsequent fix without using the web interface. The CLI supports agents such as Claude Code, Codex, and Gemini CLI, while optional CircleCI skills provide workflow guidance; the web application can also generate fix prompts containing a failed pipeline’s branch, ID, and diagnostic command. Developers retain control over actions that initiate or interrupt CI work, while agents can use exit codes, targeted context, and existing authentication to diagnose failures and iterate efficiently.

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