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Getting Started with Claude Code: Setup, Tips, and Workflow

2025-12-15·11 min read

Claude Code is Anthropic's agentic coding tool that lives in your terminal. Unlike traditional AI assistants that just answer questions, Claude Code understands your entire codebase, makes edits across multiple files, runs commands, and iterates on results. Here's how to set it up and get the most out of it.

1. Installation and First Run

You need Node.js 18 or later. Install Claude Code globally:

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

Navigate to any project directory and run claude. On first launch, you'll authenticate with your Anthropic account. Claude will analyze your project structure and be ready to work.

For the best experience, run it in a terminal that supports rich output — iTerm2, Warp, Windows Terminal, or VS Code's integrated terminal all work well.

2. The CLAUDE.md File

Create a CLAUDE.md file in your project root. This is your project brief for Claude — it reads this file at the start of every session to understand your project's conventions.

Include:

  • Tech stack and key dependencies
  • Build and test commands
  • Code style preferences
  • Directory structure overview
  • Any project-specific rules ("always use server components," "tests go in tests directories")

A good CLAUDE.md is the single highest-leverage thing you can do to improve Claude Code's output quality for your project.

3. Effective Task Descriptions

Claude Code works best when you describe outcomes, not steps. Compare:

Weak: "Open auth.py, find the login function, add rate limiting" Strong: "Add rate limiting to the login endpoint — max 5 attempts per IP per minute, return 429 after that"

The second version tells Claude what you want without prescribing how to find or implement it. Claude will figure out which files to modify, what rate limiting approach fits your stack, and how to integrate it cleanly.

4. Multi-File Operations

Claude Code's strength is working across files. Refactoring a function that's used in 15 places? Changing an API response format that affects backend handlers and frontend consumers? These multi-file operations are where Claude Code shines.

Just describe what needs to change and Claude will trace dependencies, update all affected files, and maintain consistency. It's particularly effective for:

  • Renaming functions/variables across a codebase
  • Migrating from one pattern to another
  • Adding a new field that needs to flow through multiple layers

5. Using Git Integration

Claude Code can commit, create branches, review diffs, and even open PRs. Use it for:

  • Committing completed work with meaningful messages
  • Reviewing your own changes before pushing
  • Creating feature branches for isolated work
  • Generating PR descriptions from diffs

A practical workflow: work with Claude Code on a feature branch, have it commit along the way, then ask it to review the full diff against main before you push.

6. Advanced Features

Slash commands — Type / to see available commands. /review reviews recent changes. /init creates a CLAUDE.md. /cost shows token usage.

MCP servers — Connect Claude Code to external tools like databases, browsers, and APIs through the Model Context Protocol.

Hooks — Configure shell commands that run automatically before or after Claude takes specific actions. Useful for auto-formatting, linting, or running tests.

Background agents — Use the Cowork feature to spawn agents that work on independent tasks in parallel while you continue your main conversation.

Conclusion

Claude Code changes how you develop software. Instead of switching between editor, terminal, documentation, and AI chat, you work in a single context where your AI assistant has full access to your project. Start with simple tasks, build up your CLAUDE.md over time, and gradually expand to multi-file operations and advanced features as you develop confidence in the workflow.