Introduction: The Agentic Coding Loop in Action

What This Module Teaches

Everything you have learned so far — context engineering, system prompts, CLAUDE.md — is about to get concrete. In this module, you will experience the full agentic coding loop in action through a real project: HookHub, a Next.js webhook management application built entirely with Claude Code.

The Agentic Loop

The core of Claude Code is the agentic loop:

You write a goal
    ↓
Claude plans the approach
    ↓
Claude reads relevant files
    ↓
Claude executes actions (write code, run tests, fix errors)
    ↓
Claude validates the result
    ↓
Claude reports back or continues autonomously

This loop runs continuously until the goal is achieved (or Claude surfaces a decision for you to make).

What makes this powerful is that the loop is self-correcting. When Claude writes code and the tests fail, it reads the error output and attempts a fix — without you having to intervene.

What Is HookHub?

HookHub is a webhook management application that:

• Receives webhooks from external services
• Stores them in a database with metadata
• Provides a dashboard to inspect, replay, and filter webhook events
• Supports notification hooks (Slack, email) when specific events are received

It is a perfect teaching project because it:

• Is complex enough to demonstrate real agentic behavior
• Requires connecting multiple technologies (Next.js, database, API routes)
• Benefits significantly from spec-driven development
• Shows how Claude Code handles errors and self-corrects

The Spec-Driven Development Approach

One of the most powerful techniques you will learn in this module is spec-driven development — writing a detailed specification file before asking Claude to implement anything.

The spec file tells Claude:

• What the application does
• What technologies to use
• What the data models look like
• What the API endpoints need to do
• What the UI should display
• What the acceptance criteria are

When Claude Code has this spec, it can architect the entire application coherently rather than guessing at requirements.

Module Preview

Here is what you will build and learn in this module:

1. Environment Setup — Install Next.js, configure the AI environment, set up the project structure
2. Playwright Integration — Connect browser automation so Claude can verify the UI works
3. Spec-Driven Design — Write a comprehensive spec and watch Claude architect from it
4. AI Implementation — Execute the full implementation using Claude Code end-to-end

Ready to see agentic coding in action? Let's set up the environment.