Cline

Cline is an open-source VS Code extension that provides AI coding assistance with full file system and terminal access, enabling the AI to read, write, and execute code within your development environment. The agent can create and edit files, run terminal commands, inspect build output, and iterate on solutions -- but every action requires explicit developer approval before execution. It supports multiple LLM providers including Claude, GPT-4, Gemini, and local models through compatible APIs, giving teams flexibility in model selection and cost management.

For enterprise developers, Cline's open-source nature (Apache 2.0 license) means the extension code is fully auditable and can be forked or modified for organization-specific requirements. Since it runs locally within VS Code and connects directly to LLM APIs, no code passes through third-party intermediary servers -- data flows only between the developer's machine and their chosen model provider. Teams can standardize on specific LLM providers and configure API endpoints to route through corporate proxies or self-hosted model deployments.

Cline is designed for developers who want agentic coding capabilities integrated into their existing VS Code workflow with maximum visibility into what the agent does. Its differentiator is the strict human-in-the-loop approval model -- unlike agents that execute autonomously and present results after the fact, Cline shows each proposed action (file edit, command execution, API call) and waits for explicit approval. This transparency makes it suitable for developers working on sensitive codebases who want AI assistance without ceding control over their development environment.