Claude Code — Your AI in the Terminal
Claude Code — Your AI in the Terminal
Give Claude direct access to your codebase, terminal, and filesystem — and watch it become the most capable coding partner you have ever had.
What Is Claude Code?
Claude Code is Anthropic’s official command-line interface (CLI) that brings Claude directly into your terminal. Unlike the web interface at claude.ai where you paste code snippets back and forth, Claude Code gives the AI direct access to your project files, your terminal, and your filesystem. It can read your code, understand your project structure, write and edit files, run commands, and even manage git operations — all from a single conversational interface in your terminal.
Think of it this way: claude.ai is like talking to a brilliant colleague over chat — you describe your problem, share code snippets, and get advice back. Claude Code is like that same colleague sitting at your desk, looking at your screen, and making changes directly. The difference in productivity is enormous.
- Copy-paste code into chat
- Get suggestions back as text
- Manually apply changes yourself
- One file at a time
- Good for learning and exploration
- Reads your entire codebase
- Writes and edits files directly
- Runs terminal commands
- Multi-file refactoring
- Built for real development work
Installation
Installing Claude Code takes about 30 seconds. You need Node.js 18 or newer installed on your machine (most developers already have it). Then run a single command:
claude
That is it. After running claude in your project directory, Claude Code will scan your project structure, understand the codebase, and open an interactive session where you can give it instructions in plain English.
Key Features
Claude Code is not just a chat in the terminal — it is a full-featured development agent. Here are the capabilities that make it indispensable for modern development:
Read and Understand Your Codebase
Claude Code can read any file in your project, understand imports and dependencies, trace function calls across modules, and build a mental model of your entire codebase. Ask it “How does the authentication flow work?” and it will read the relevant files and explain the full picture.
Write and Edit Files Directly
No more copying code from a chat window and pasting it into your editor. Claude Code edits files in place. It shows you a diff of what it plans to change and asks for your approval before writing. You stay in control while Claude does the typing.
Run Terminal Commands
Claude Code can execute shell commands — run tests, install packages, build your project, check linting errors. It reads the output and uses it to inform its next action. If a test fails, it reads the error, finds the bug, and proposes a fix.
Git Integration
Claude Code understands git. It can check your status, create branches, stage changes, write commit messages, and even create pull requests. Ask it “commit these changes with a descriptive message” and it handles the entire git workflow.
Multi-File Editing
Need to rename a component and update every import across 30 files? Need to add error handling to every API endpoint? Claude Code can make coordinated changes across your entire project in a single operation, something that would take you an hour manually.
What Can You Actually Do With It?
Here are real examples of commands you can give Claude Code. Each of these is something you type in plain English, and Claude Code figures out how to accomplish it:
The CLAUDE.md Project Instructions File
One of the most powerful features of Claude Code is the CLAUDE.md file. Place this file in the root of your project, and Claude Code will read it every time it starts a session. Think of it as a permanent system prompt for your project — instructions that persist across every conversation.
We use TypeScript strict mode, Tailwind CSS, and Prisma ORM.
Conventions:
- Use server components by default
- Client components go in /components/client/
- All API routes use Zod validation
- Tests use Vitest, not Jest
- Commit messages follow Conventional Commits
With a well-written CLAUDE.md, Claude Code understands your project’s conventions from the very first message. It will write code that matches your style, use the right tools and frameworks, and follow your team’s standards without you having to repeat yourself every session. This is one of the features that separates casual AI usage from a truly integrated AI development workflow.
When to Use Claude Code vs claude.ai
Both tools use the same underlying Claude models, but they serve different purposes. Here is a practical decision framework:
| Use Case | Best Tool |
|---|---|
| Writing a blog post, email, or document | claude.ai |
| Fixing bugs across multiple files | Claude Code |
| Brainstorming ideas | claude.ai |
| Refactoring a codebase | Claude Code |
| Analyzing a PDF or image | claude.ai |
| Setting up a new project from scratch | Claude Code |
| Creating and running tests | Claude Code |
The general rule: if your task involves files on your computer, use Claude Code. If your task is conversational or document-based, use claude.ai. Many professionals use both throughout the day — claude.ai for writing and research, Claude Code for development work.
- Claude Code is a CLI tool that gives Claude direct access to your codebase, terminal, and filesystem
- Install with
npm install -g @anthropic-ai/claude-code, then runclaudein your project directory - Key features: reads/writes files, runs commands, git integration, multi-file editing
- Requires Pro subscription ($20/month) or an Anthropic API key
- Use CLAUDE.md to set persistent project instructions that Claude Code reads every session
- Use Claude Code for file-based tasks, claude.ai for conversational and document tasks
- Start with read-only tasks to build confidence, then move to editing and refactoring
Úvod do Claude Code — rozhraní příkazové řádky, které umožňuje Claude číst, zapisovat a spravovat váš kód přímo z terminálu.
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