Fundamentals

Open the hood on Claude Code, Gemini CLI, and OpenCode. What’s actually happening when you ask an agent for help? A guided tour of the Think-Act-Observe loop — no engineering background required.

Tokens are the unit of currency for language models — every API bill, context window, and rate limit is measured in them. But what is a token? Type a sentence and watch it shatter into the pieces an LLM actually sees.