What Is Claude Code?
Claude Code is Anthropic's official AI coding assistant delivered as a command-line interface (CLI). Unlike IDE plugins that offer inline autocomplete, Claude Code operates as an interactive agent that reads your entire project, understands your codebase in context, and executes multi-step coding tasks — from writing new features to debugging production bugs to refactoring legacy modules.
Step 1: Install Claude Code CLI
Open your terminal and run:
npm install -g @anthropic-ai/claude-codeVerify the installation and authenticate:
claude --version
claude auth loginStep 2: Open Your Project
cd /path/to/your/project
claudeStep 3: Describe Your Task in Plain English
Simply describe what you want: Add rate limiting to the /api/login endpoint — max 5 requests per minute per IP. Claude Code will read relevant files, plan the implementation, write the code, and show you a diff for review.
Step 4: Review the Proposed Changes
Claude Code never applies changes without showing a diff first. Type yes to apply, no to reject, or type a follow-up to adjust.
Step 5: Apply and Test
Run your test suite after applying. If tests fail, paste the error back into Claude Code — it will diagnose and fix in the same session.
Step 6: Slash Commands
| Command | What It Does |
|---|---|
| /review | Audit a file for bugs and security issues |
| /explain | Get a plain-English explanation of code |
| /commit | Generate a semantic commit message |
| /test | Generate unit tests for a function |
Advanced Tips
- CLAUDE.md file: Add project-specific coding standards at your repo root
- MCP servers: Connect external tools via the Model Context Protocol
- Cost management: Use /clear to reset context between unrelated tasks
Conclusion
Claude Code is one of the most capable AI coding tools available in 2026. Start with small, well-scoped tasks, review every diff carefully, and gradually expand to larger autonomous workflows.
