Introduction to Claude Code

My Understanding

Claude Code is a command-line interface (CLI) tool developed by Anthropic. It allows developers to use Claude’s coding capabilities directly within their terminal. Unlike the web interface, it has direct access to the local file system, enabling it to read code, write new files, run tests, and even execute git commands autonomously or with permission.

AI Draft

Claude Code is Anthropic’s official agentic CLI tool that can:

• Edit Files: Directly modify codebases with high precision.
• Run Commands: Execute shell commands to run tests, builds, or linting.
• Git Integration: Summarize changes, create commits, and manage branches.
• Context Awareness: Automatically index your codebase to provide relevant answers without manual copy-pasting.

Claude (Web) vs Claude Code (CLI)

Feature	Claude (Web)	Claude Code (CLI)
Primary User	General users / Writers	Developers / Engineers
Interface	Browser / Mobile App	Terminal / Shell
File Access	Manual upload only	Direct local file system access
Capabilities	Brainstorming, Analysis	Editing code, running tests, Git
Autonomy	Suggests text/code	Agentic (performs actions)

Key Points

• Agentic: It doesn’t just suggest code; it can perform the actions (if permitted).
• Tool Use: It uses tools like grep, ls, and read to understand the project structure.
• Permission-based: For safety, it asks for permission before running potentially destructive commands.

Examples

• claude - Start a session.
• claude "fix the bug in the auth controller and run tests" - Task-specific command.

Related

• AI/Claude Code/index
• AI/Claude Code/Usage of Claude Code
• AI/Claude Code/Slash Commands Reference
• AI/Prompt Engineering