CircleCI rebuilds CLI in Go with MCP server support, launches 1.0 beta

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CircleCI released a ground-up rewrite of its command-line tool in Go on July 7, now available as a 1.0 beta at cli.circleci.com for multiple platforms. The new CLI outputs JSON on every data-returning command, uses browser-based OAuth login with system keyring storage, and includes a built-in --jq flag for inline payload querying. A debugging TUI, structured error messages with doc links, and environment variable support for NO_COLOR, PAGER, and CI=true are also included. A first-party MCP server is bundled in the same binary, allowing AI coding agents in Claude, Cursor, and VS Code to call CircleCI directly via a single setup subcommand. The release is labeled 1.0 beta by CircleCI itself, with support for additional agent hosts like Zed and Continue.dev not yet confirmed.

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