Cline is an open-source AI coding agent ecosystem designed to operate across IDEs (VS Code and JetBrains), terminals, and desktop environments (macOS and Windows). The system functions by analyzing project structures and file relationships to execute coordinated codebase changes, which include fixing linter errors, type mismatches, and syntax issues. Technically, Cline operates using a dual-mode architecture: "Plan mode" for strategic exploration and "Act mode" for execution. It features a human-in-the-loop workflow where users can manually approve file edits and terminal commands or enable autonomous "auto-approve" settings. The tool integrates deeply with the terminal to monitor real-time command output, allowing it to react to build failures or test crashes. Developers can extend functionality via a Node.js SDK to register custom tools or utilize the Model Context Protocol (MCP) to connect to external databases and APIs. Cline supports a wide range of LLM providers, including Anthropic, OpenAI, Google Gemini, and local models via Ollama or LM Studio. Advanced features include multi-agent orchestration for complex task delegation, cron-based task scheduling for automated routines, and integration with messaging platforms like Slack and Telegram. Users can also enforce project-specific coding standards through .clinerules files.