Q&A
Frequently asked questions
Answers to what beginners ask most.
Will Claude change my files on its own?
No. It asks your permission before every change and command. You pick the permission mode and decide which actions run automatically.
Which programming languages does it know?
Almost all of them — JavaScript, Python, Go, Rust, Java, C++, Swift, and more. It also works with HTML, CSS, SQL, and shell scripts.
Does it work offline?
No. The model runs in the cloud, so you need internet. But your code stays local.
Is Claude Code free?
Claude Code works with a Claude subscription (Pro/Max) or an Anthropic API key. You're billed based on usage.
What is the "Effort" level?
It sets how deeply Claude works on a task — from low (quick jobs) to ultracode (maximum depth, multi-agent). Change it with /effort.