What is Claude Code and how does it assist developers?

Claude Code is Anthropic's command-line AI coding tool that operates directly in your terminal. It helps developers write, review, debug, and refactor code through conversational interactions. By reading your project files, it understands your codebase and can generate or modify code directly, providing assistance with new features, bug fixes, code refactoring, test generation, and more.

What specifically can developers ask Claude Code to do within a project?

Developers can ask Claude Code to perform a variety of tasks within their project. This includes writing new features from a description, fixing described or pasted bugs, refactoring code to follow better patterns, reviewing recent changes for issues, generating tests for functions, explaining unfamiliar code, and setting up configuration files like Docker, CI/CD, or linting. It works by understanding the project's folder structure, dependencies, and existing patterns.

What are the primary requirements for installing and using Claude Code?

To install and use Claude Code, you need Node.js version 18 or higher, along with an active Claude subscription (either Pro or Max). Installation is done via npm using the command 'npm install -g @anthropic-ai/claude-code'. After installation, you navigate to your project directory in the terminal and start a session by typing 'claude'.

How does Claude Code differ from other chat-based AI tools like ChatGPT?

The key difference is that Claude Code reads and understands your entire project, including its folder structure, dependencies, existing code patterns, and team conventions. This deep project context allows it to generate or modify code that fits seamlessly within your codebase. In contrast, ChatGPT and similar chat-based AI tools typically work only with code snippets you paste, lacking this comprehensive project-level understanding.

What are SKILL.md files in Claude Code and how do they enhance its functionality?

SKILL.md files are markdown files that customize Claude Code's behavior for specific tasks, effectively acting as specialized instructions. While Claude Code is general-purpose out-of-the-box, skills allow it to adhere to your team's specific conventions, frameworks, and patterns for tasks like code reviews, testing, or documentation. They are stored in designated folders (e.g., '~/.claude/skills/') and are read by Claude Code at session startup when relevant to the task at hand.

Claude Code Tutorial: Setup, Skills, and MCP Servers (2026)

Claude Code for Beginners: Everything You Need to Know (2026)

Published: May 2, 2026

Category: Guides

Claude Code is Anthropic's terminal-based AI coding agent. This tutorial takes you from installation through to advanced usage with SKILL.md skills and MCP servers.

> Quick Answer: Claude Code is Anthropic's terminal-based AI coding agent. It requires Node.js 18+ and an Anthropic API key, installed globally via npm. Key features include code generation, review, refactoring, testing, skill customization, and integration with external tools via MCP servers.

Part 1: Installation and Setup

Claude Code requires Node.js 18+ and an Anthropic API key.

npm install -g @anthropic-ai/claude-code

Set your API key:

export ANTHROPIC_API_KEY=your-key-here

Add the export to your .bashrc or .zshrc to make it persistent. Navigate to a project directory and start:

cd your-project
claude

Try something simple first: "What does this project do? Summarize the architecture."

Part 2: Core Workflows

Code generation: Describe what you want. "Add a user authentication module using JWT tokens. Include login, logout, and token refresh endpoints."

Code review: "Review the changes in the last commit. Focus on security issues and performance."

Refactoring: "Refactor the database module to use the repository pattern. Update all callers."

Testing: "Write unit tests for the authentication module. Cover the happy path and edge cases."

Part 3: Skills

Skills are SKILL.md files that customize how Claude Code behaves.

Where Skills Live

Global skills: ~/.claude/skills/ (apply to all projects)
Project skills: .claude/skills/ in your project root (apply to one project)

Installing Skills

Browse and download skills from Agensi, then place them in your skills directory. Claude Code loads them automatically.

Essential Skill Categories

Frontend design skills change how Claude Code generates UI components. Code review skills standardize what Claude Code checks during reviews. Testing skills define your testing conventions.

Part 4: MCP Servers

MCP servers connect Claude Code to external tools. Edit ~/.claude/config.json:

{
  "mcpServers": {
    "github": {
      "command": "npx",
      "args": ["@github/mcp-server"],
      "env": { "GITHUB_TOKEN": "your-token" }
    }
  }
}

Most useful MCP servers: GitHub (PRs and issues), Supabase (database access), Playwright (browser testing), Context7 (framework docs), Figma (design files).

Part 5: Advanced Tips

Reduce token usage: Use Sonnet for most tasks, Opus only for complex reasoning. Write specific prompts. Install skills (less trial-and-error).

Combine multiple skills: A common stack: frontend design skill + testing skill + documentation skill + git skill.

Next Steps

1. Install Claude Code and run it on a project
2. Browse skills on Agensi and install one that matches your stack
3. Set up one MCP server (GitHub is a good starting point)