An agent is a loopAn agent is a loop. You send a prompt, Claude decides what to do, and it can call your tools.PromptYour prompt joins the system prompt and the tool definitions in the context window.tool_useFor a client tool, Claude returns stop_reason "tool_use" and a tool_use block with an id, the tool's name, and its input.
Lesson 1 is free.
No account, nothing to install.