Claude Code — The Autonomous Terminal Agent

18 min

What you will learn

Install Claude Code and configure API key
Write a CLAUDE.md file
Execute multi-file refactoring and TDD workflows

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Claude Code — The Autonomous Terminal Agent

Claude Code is Anthropic's command-line AI agent that operates directly in your terminal. Unlike web-based AI assistants where you paste code snippets back and forth, Claude Code reads your files, writes code, runs commands, and manages entire development workflows — all from the terminal. It is not a plugin for an existing editor; it is a standalone agent that treats your codebase as its working environment. This lesson is a comprehensive guide to what Claude Code is, how it works, what it can do, and how to use it effectively for real projects.

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Knowledge check

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CLAUDE.md is?

Key takeaway

Claude Code is not autocomplete — it is an autonomous agent that reads your codebase, plans changes across files, and executes them. The CLAUDE.md file makes it work well.

Practice Exercise

Hands-on practice — do this now to lock in what you learned

Open an AI assistant and try this:

Create CLAUDE.md, install Claude Code, start session. Try: 'Add input validation' or 'Write tests for utils.'

Open in ChatGPT

Or try it in:Claude Gemini Perplexity

+10 XP when completed

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