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Claude Code Complete Guide

Claude Code 2.0: VS Code Extension + 30h Autonomous Coding (Sep 2025)

Announced September 30, 2025 - Released alongside Claude Sonnet 4.5

Anthropic has released v2.0, a major update to its terminal-based AI coding tool "Claude Code". This version is designed to autonomously handle longer and more complex development tasks, introducing native VS Code extensions, a checkpoint system, and a revamped terminal interface.

Target Audience

  • Intermediate engineers using AI development tools in production

Key Points

  1. Understand Claude Code v2.0's three main features (VS Code integration, checkpoints, autonomous operation)
  2. Learn how to integrate into existing workflows
  3. Discover development experiences enabled by combining with Sonnet 4.5

Overview of Main Features

Native VS Code Extension (Beta)

Enables developers unfamiliar with terminals to use Claude directly from IDE. Provides real-time code change display from sidebar panel, inline diff view, seamless integration with VS Code/Cursor/Windsurf.

Checkpoint Functionality

Implemented in response to strong developer demand. Automatically generates new checkpoints for each user prompt, retained for 30 days. Restore by pressing Esc twice or using /rewind command.

Terminal Interface 2.0

Prompt history search (Ctrl+R), improved status display, enhanced performance with large contexts.

Complementary Features Supporting Autonomous Work

Subagents

Dynamically add with --agents flag. Enable parallel development workflows, such as one agent handling backend API while main agent builds frontend.

Hooks

Automatically trigger actions at specific points. Automate tasks like running test suites after code changes or linting before commits.

Background Tasks (Ctrl+B)

Keep long-running processes like development servers in background without blocking other Claude Code operations.

Details: Three Checkpoint Restore Modes ### Restore Mode Details 1. **Chat only**: Rewind chat history, preserve code changes 2. **Code only**: Revert file changes, preserve conversation 3. **Both**: Complete restoration to previous session state ### Important Constraints - Only applies to Claude's edits, not user's direct edits or bash commands - Recommended to use alongside version control systems - Not a replacement for persistent version control, intended for session-level recovery

Claude Agent SDK - Rebranding and Feature Expansion

Rebranded from "Claude Code SDK" to Claude Agent SDK. Clarifies positioning as a general-purpose agent building tool capable of handling diverse tasks beyond coding.

Default Model Change

Claude Sonnet 4.5 set as default model.

BenchmarkScoreComparison
SWE-bench Verified82.0%76% improvement over previous
OSWorld61.4%Major improvement from Sonnet 4's 42.2%

Switch models with /model command. Opus 4.1 and Haiku 4.5 also available.

Pricing and Access

Price Structure

Claude Sonnet 4.5 API pricing matches Sonnet 4:

ItemPrice
Input$3/million tokens
Output$15/million tokens

Installation

npm install -g @anthropic-ai/claude-code

Note: Do not use sudo npm install -g (permission issues and security risks)

Competitive Differentiation

Production-Focused Design

Designed for building production-ready applications, not prototypes. Early enterprise trials show Claude Code v2.0 autonomously completing:

  • Database service construction
  • Domain name acquisition
  • SOC 2 audit execution

Unix Philosophy-Based Design

Composable and scriptable. Example: 

tail -f app.log | claude -p "Slack me if you see any anomalies"

Known Issues

Documentation Gaps

GitHub Issue #8353 reports that v2.0.0 release notes are not displayed with /release-notes command.

Content Persistence Issues

Issue #8374 reports that commands executed by Claude and created content disappear after upgrading to v2.0.

Best Practices

Token Management

Frequently use /clear to manage token usage

Project Context

Create CLAUDE.md file at project root to provide context about goals, tech stack, and practices

Permission Settings

Configure /permissions to always require confirmation for specific tools

Next Steps

Check for Updates: - Official CHANGELOG: https://github.com/anthropics/claude-code/blob/main/CHANGELOG.md - Official Documentation: https://docs.claude.com/en/docs/claude-code/overview - After installation: Check installation status with claude doctor command

This article is based on publicly available information as of September 30, 2025.