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Prerequisites

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Steps

1

Install Claude Code

Install the package globally with npm:
npm install -g @anthropic-ai/claude-code
2

Navigate to your project

Change into the directory you want to work in:
cd your-project
3

Launch Claude Code

Start the interactive REPL:
claude
4

Authenticate

Inside the REPL, run the login command to sign in with your Anthropic account:
/login
This opens an OAuth 2.0 flow in your browser. Once you complete it, your credentials are stored securely (on macOS, in the Keychain).
5

Try your first task

Ask Claude something about your codebase:
Explain the main entry point of this codebase
Claude will read the relevant files and respond with an explanation.

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Your first coding task

Once you’re authenticated, try any of these prompts to get a feel for what Claude Code can do: 
Find all TODO comments in this project and summarize them

Refactor the largest function in this file to be more readable

Write a unit test for the login function

Create a git commit for the changes in my working tree

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Common first commands

/doctor

Diagnose and verify your Claude Code installation and settings. Run this if something seems wrong.

/help

List all available slash commands with their descriptions.

/config

View and modify Claude Code settings such as the model, permission mode, and theme.

/memory

Manage persistent memory that Claude carries across sessions.
The first time Claude Code invokes a tool (such as running a shell command or writing a file), it will prompt you for permission before proceeding. You can allow or deny each action, and configure how permissions are handled going forward via /config.

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