CCG (Claude + Codex + Gemini) is a workflow engine that automatically analyzes user intent, selects strategies, and orchestrates multiple AI models to collaborate on task execution. It provides a command-line interface where users invoke /ccg:go to trigger a multi-agent coordination process across Claude Code, Codex, and Gemini, handling the orchestration and communication between these models. The system supports Chinese and English and integrates with various AI providers.