Claude Code
Agentic coding with Claude from your terminal and IDE - autonomous multi-hour development tasks
Last updated: May 2025
What is Claude Code?
Claude Code is a command-line tool that brings Claude's agentic coding capabilities directly to your terminal and IDE. It can work autonomously for hours on complex, multi-step development tasks while you maintain oversight and control.
🚀 Key Capabilities
- • 30+ hour autonomous operation
- • Multi-file editing & refactoring
- • Checkpoints & instant rollback
- • Extended thinking integration
- • Real-time IDE integration
- • Tool use & terminal access
💡 Perfect For
- • Feature implementation
- • Bug fixing & debugging
- • Code refactoring
- • Test generation
- • Documentation writing
- • Dependency updates
⚡ Powered by Opus 4.5
Claude Code uses Opus 4.5, the world's best coding model (~81% SWE-bench verified). Extended thinking enables deeper reasoning chains over multi-hour autonomous sessions.
Installation & Setup
Command Line Installation
# Install via npm npm install -g @anthropic-ai/claude-code # Or via Homebrew brew install anthropic/tap/claude-code # Verify installation claude --version
Requires an Anthropic API key. Set via ANTHROPIC_API_KEY environment variable.
IDE Integrations
VS Code Extension
Native VS Code integration with dedicated sidebar panel and inline diffs.
JetBrains IDEs
Integrated via AI chat in IntelliJ IDEA, PyCharm, WebStorm, and more.
Core Features
💾 Checkpoints & Rollback
Claude Code automatically saves progress at key points. If something goes wrong, instantly rollback to any previous checkpoint.
🔄 Multi-file Editing
Claude Code can edit multiple files simultaneously, maintaining consistency across your entire codebase.
💭 Extended Thinking
For complex tasks, Claude Code can engage extended thinking mode to reason deeply about architecture and implementation.
🛠️ Terminal Access
Claude Code can execute terminal commands, run tests, install packages, and interact with version control.
Claude Code 2.1 (January 2026)
The latest Claude Code release brings significant workflow improvements:
🔄 Skill Hot-Reload
Edit skills without restarting sessions. Changes apply immediately for rapid iteration.
📱 Session Teleportation
Continue work seamlessly across devices. Start on desktop, continue on laptop.
🪝 Hooks in Frontmatter
Add hooks directly to agents and skills via YAML frontmatter for cleaner configuration.
🔌 25+ MCP Servers
Expanded ecosystem with LSP support and dozens of community MCP integrations.
claude update to get the latest version.