There is a certain type of AI product that wants you to sit back, relax, and let it handle everything. Cline is not quite that product. It is an AI coding agent - it will read your repository, figure out which of your seven hundred files needs to change, rewrite them, run your build, notice the compiler is unhappy, and fix its own mistakes. That part is very automated. But at each meaningful step it pauses and waits for a human to say yes. This is either a limitation or the entire point, depending on whether the codebase in question is a weekend project or a bank.
Cline started, appropriately, as a fast reaction to a new model. In June 2024, roughly ten days after Anthropic released Claude 3.5 Sonnet, a developer named Saoud Rizwan was at an Anthropic-organized hackathon reading the model card - the documentation describing what the model could do - and built a small tool that let Claude act as an agent inside VS Code. He called it Claude Dev. By October 2024 it had a new name, Cline, and a rapidly growing pile of installs. The renaming was tidy foreshadowing: the product was model-agnostic, and naming it after one model would have undersold the whole idea.
The idea is that a coding agent should be open, transparent, and yours. Open, as in Apache 2.0 open source - you can read every line of what the agent does. Transparent, as in you see each file edit and terminal command before it happens, and you watch exactly how many tokens (and dollars) each step costs. Yours, as in the software runs client-side on your machine and talks to whichever model you point it at - Claude, GPT, Gemini, or a local model running through Ollama on your own hardware, which costs nothing at all.
That last part matters more than it sounds. A lot of AI coding tools are SaaS products that pick the model for you, mark up the tokens, and keep your code on their servers. Cline's pitch is essentially the negative of each of those: no lock-in, no markup, no code leaving your laptop unless you send it. For an individual developer this is a nice-to-have. For a regulated enterprise with a compliance team and a list of things that absolutely cannot happen, it is closer to a requirement.
