The rest of the framework is theory - what MCP is, how the agent loop works, how permissions should be designed. This section is theory's opposite. It's practice. Pick a build guide, open a terminal, and by the end you'll have a real working agent running on your machine. Three guides, three distinct agent shapes, each one teaching different parts of the stack.
The three guides, and what each one teaches.
~ three guides, three agent shapes ~
Start with First agent if you've never built one. The other two assume you've been through that one.
A Mac or Linux machine (Windows via WSL works fine too)
Node.js 18+ or Bun installed
An Anthropic API key (you'll get one by signing up; free trial credits are enough for all three guides)
A text editor you like (VS Code, Zed, vim, whatever)
The shape every guide follows.
~ the five steps every guide walks through ~
Open a guide, follow the steps, run the commands. By the end you'll have a real agent doing real work. Not a demo. The code you write in these guides is the same code you'd ship.