What is Cline?
Cline (formerly Claude Dev) is an open-source autonomous coding agent that runs as a VS Code extension. Unlike most AI coding tools that focus on completion or chat, Cline is built around an agent loop. It plans tasks, edits multiple files, runs terminal commands, and uses a built-in browser to verify results, with human approval gates at each step.
Key Features
- Multi-file agentic edits: plans changes, edits, and verifies across the workspace
- Terminal and browser integration: runs commands and inspects rendered output for self-correction
- Human-in-the-loop by default: every file write and shell command is reviewable before execution
- Bring-your-own-key model routing: works with Anthropic, OpenAI, Google, OpenRouter, local Ollama, and more
- Open-source: Apache 2.0 license, with a transparent agent loop you can fork or audit
Who is it for?
Cline fits developers who want an agent-style experience inside VS Code without committing to a closed-source IDE fork. The BYO-key pricing model is appealing for teams whose security or finance teams want direct provider billing rather than a markup.
Pricing
The extension itself is free. Cost is whatever your model provider charges. Heavy use of frontier models can run higher than a fixed Cursor or Copilot subscription, but stays predictable and auditable.