Cline is an open-source autonomous coding agent extension for Visual Studio Code.

How does Cline safeguard code execution?

It asks for explicit human approval before running terminal commands or modifying files.

The extension is 100% free and open-source.

Which AI models does Cline support?

It supports Anthropic Claude, OpenAI, OpenRouter, Gemini, and local models via Ollama.

Can Cline test frontend UIs?

Yes, it includes a browser automation step to inspect rendered web interfaces.

Are API keys required?

Yes, users supply their own API keys and pay model vendors directly.

Cline

Autonomous AI coding agent for VS Code with terminal and browser capabilities.

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What is Cline?

TL;DR

Cline is an open-source autonomous coding agent for VS Code that can inspect code, edit files, run terminal commands with approval, browse web interfaces, and work across multi-step development tasks.

Autonomous VS Code extension that edits code and executes terminal commands
Built-in browser automation for testing web user interfaces
Human-in-the-loop approval mechanism for terminal and file actions

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About

Cline (formerly Claude Dev) is an open-source autonomous coding assistant that operates directly inside Visual Studio Code. Designed to act as a human-supervised AI developer, Cline can inspect project directories, write code across multiple files, run terminal commands, and use a browser to verify web interfaces. Developers use Cline to handle end-to-end development tasks, from implementing new API endpoints to debugging build errors and writing unit tests. Because Cline asks for explicit user permission before executing terminal commands or modifying files, developers maintain total control over their local development environment. What makes Cline unique is its combination of terminal execution, file system access, and web browsing capabilities within VS Code. The extension is free and open-source, allowing users to connect their preferred API keys (including Anthropic, OpenAI, or local models via Ollama) and pay only for actual token usage. For FutureStack, Cline belongs in Coding because it provides autonomous programming and editor integration. It is best for software engineers, full-stack builders, and indie hackers who want a capable AI coding agent inside VS Code.

Use Cases

Autonomous Coding

Delegate multi-step coding tasks to a VS Code agent that can inspect files, edit code, and run commands with approval.

Codebase Refactoring

Make coordinated changes across multiple files while keeping the developer in control of sensitive actions.

Frontend Testing

Use browser capabilities to inspect and validate web interfaces during development and debugging.

Bug Resolution

Investigate errors, implement fixes, run tests, and iterate through a supervised development workflow.

Key Features

Autonomous VS Code extension that edits code and executes terminal commands
Built-in browser automation for testing web user interfaces
Human-in-the-loop approval mechanism for terminal and file actions
Support for Anthropic, OpenAI, OpenRouter, and local model providers

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