Getting Started with Claude Code (CLI)

What Is Claude Code

Claude Code is Anthropic's command-line coding agent. You run it inside a project folder and it reads your files, edits code, runs commands and tests, all from the terminal.

Installing Claude Code

npm install -g @anthropic-ai/claude-code
# or run it without a full install
npx @anthropic-ai/claude-code

Your First Session

cd my-project
claude

Describe the task in plain language, for example "add input validation to the signup form". Claude Code inspects the repository, makes focused edits and shows you a diff to approve.

Core Capabilities

• Edit files - Apply code changes with review.
• Run commands - Execute builds and tests in the project.
• Search and read - Grep and open files to understand the codebase.
• Skills and helpers - Load reusable instructions on demand.
• Slash commands - Use built-in prompts like /init and /install.

Key Points

• Claude Code works inside an existing project folder.
• Install globally with npm, or run via npx.
• It edits, runs, searches and tests as part of one workflow.
• Review diffs before accepting changes.