Cline

Cline is an open-source autonomous AI coding agent that operates as a VS Code extension, capable of creating files, editing code, executing terminal commands, and browsing the web to complete complex software development tasks. Unlike simple code completion tools, Cline functions as an agentic assistant that plans multi-step implementations, executes them with human-in-the-loop approval, and iterates based on test results and error output. It supports multiple AI providers including OpenAI, Anthropic, Google, and local models through Ollama, giving developers flexibility in choosing their preferred model and managing costs. Cline presents a transparent diff view for every file change, requires explicit approval before executing commands or modifying files, and maintains full conversation context about your project structure and decisions. The tool excels at implementing features from natural language descriptions, debugging complex issues by reading error logs and tracing through code, refactoring large codebases with consistent patterns, and setting up project infrastructure from scratch. With over 15 million installs on the VS Code marketplace, Cline has become one of the most popular AI coding assistants for developers who want autonomous capability with full control and transparency over every action taken.