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Claude Code (Restored)

The world needs an open-source Claude Code. A reverse-engineered restoration based on @anthropic-ai/claude-code v2.0.76.

For educational and research purposes only.

Disclaimer

This is an educational project for studying and learning CLI tool architecture design. This is NOT the official Claude Code source code, but a reimplementation based on public APIs and type definitions.

For the official Claude Code, please install the official version:

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

Installation

# Install dependencies
npm install

# Build the project
npm run build

# Link globally (optional)
npm link

Usage

# Interactive mode
npm run dev

# Or run after building
node dist/cli.js

# With initial prompt
node dist/cli.js "Hello, please analyze this project"

# Print mode
node dist/cli.js -p "Explain this code"

# Specify model
node dist/cli.js -m opus "Complex task"

# Resume last session
node dist/cli.js --resume

Configuration

Set up your API key:

Linux/macOS:

export ANTHROPIC_API_KEY=your-api-key
# or
export CLAUDE_API_KEY=your-api-key

Windows Command Prompt:

set ANTHROPIC_API_KEY=your-api-key
# or
set CLAUDE_API_KEY=your-api-key

Windows PowerShell:

$env:ANTHROPIC_API_KEY="your-api-key"
# or
$env:CLAUDE_API_KEY="your-api-key"

Environment Variables

Variable Description Default
ANTHROPIC_API_KEY API Key -
BASH_MAX_OUTPUT_LENGTH Max Bash output length 30000
CLAUDE_CODE_MAX_OUTPUT_TOKENS Max output tokens 32000
CLAUDE_TELEMETRY_ENABLED Enable telemetry true

Project Structure

src/
├── index.ts                # Main entry
├── cli.ts                  # CLI entry point
├── core/
│   ├── client.ts           # Anthropic API client (with retry & cost calculation)
│   ├── session.ts          # Session management
│   └── loop.ts             # Conversation loop
├── tools/                  # 25 tools
│   ├── base.ts             # Tool base class
│   ├── bash.ts             # Bash execution (with sandbox)
│   ├── file.ts             # File read/write/edit
│   ├── multiedit.ts        # Batch editing
│   ├── search.ts           # Glob/Grep search
│   ├── web.ts              # Web fetch/search
│   ├── todo.ts             # Task management
│   ├── agent.ts            # Sub-agents
│   ├── notebook.ts         # Jupyter Notebook editing
│   ├── planmode.ts         # Plan mode
│   ├── mcp.ts              # MCP protocol client
│   ├── ask.ts              # User Q&A
│   ├── tmux.ts             # Tmux multi-terminal
│   ├── skill.ts            # Skills and slash commands
│   └── sandbox.ts          # Bubblewrap sandbox
├── ui/                     # Ink/React UI components
│   ├── App.tsx             # Main app
│   └── components/         # UI components
├── hooks/
│   └── index.ts            # Hooks system
├── auth/
│   └── index.ts            # OAuth authentication
├── session/
│   └── index.ts            # Session persistence & recovery
├── context/
│   └── index.ts            # Context management & compression
├── parser/
│   └── index.ts            # Code parser
├── search/
│   └── ripgrep.ts          # Vendored ripgrep support
├── telemetry/
│   └── index.ts            # Telemetry & analytics
├── config/
│   └── index.ts            # Configuration management
├── utils/
│   └── index.ts            # Utility functions
└── types/
    └── index.ts            # Type definitions

Implemented Tools (25)

Tool Status Description
Bash ✅ Complete Command execution with background & sandbox support
BashOutput ✅ Complete Get background command output
KillShell ✅ Complete Terminate background processes
Read ✅ Complete File reading with image/PDF/Notebook support
Write ✅ Complete File writing
Edit ✅ Complete File editing (string replacement)
MultiEdit ✅ Complete Batch file editing (atomic operations)
Glob ✅ Complete File pattern matching
Grep ✅ Complete Content search (ripgrep-based)
WebFetch ✅ Complete Web page fetching
WebSearch ⚠️ Needs config Requires search API
TodoWrite ✅ Complete Task management
Task ✅ Complete Sub-agents
TaskOutput ✅ Complete Get agent output
NotebookEdit ✅ Complete Jupyter Notebook cell editing
EnterPlanMode ✅ Complete Enter plan mode
ExitPlanMode ✅ Complete Exit plan mode
ListMcpResources ✅ Complete List MCP resources
ReadMcpResource ✅ Complete Read MCP resource
AskUserQuestion ✅ Complete Ask user questions
Tmux ✅ Complete Multi-terminal session management
Skill ✅ Complete Skill system
SlashCommand ✅ Complete Custom slash commands

Features

OAuth Authentication

Supports both API Key and OAuth authentication:

import { initAuth, startOAuthLogin, setApiKey } from './auth';

// Using API Key
setApiKey('your-api-key', true); // true for persistence

// Or using OAuth login
await startOAuthLogin({
  clientId: 'your-client-id',
  scope: ['read', 'write'],
});

Session Persistence & Recovery

Automatic conversation saving and restoration:

import { SessionManager, listSessions, loadSession } from './session';

const manager = new SessionManager({ autoSave: true });

// Start new session or resume
const session = manager.start({
  model: 'claude-sonnet-4-20250514',
  resume: true, // Try to resume last session
});

// List all sessions
const sessions = listSessions({ limit: 10 });

// Export as Markdown
const markdown = manager.export();

Context Management

Intelligent context compression and summarization:

import { ContextManager, estimateTokens } from './context';

const context = new ContextManager({
  maxTokens: 180000,
  summarizeThreshold: 0.7, // Start compressing at 70%
  keepRecentMessages: 10,
});

// Add conversation turn
context.addTurn(userMessage, assistantMessage);

// Get optimized messages
const messages = context.getMessages();

// Manual compaction
context.compact();

Code Parser

Multi-language code analysis support:

import { parseFile, parseCode, detectLanguage } from './parser';

// Detect language
const lang = detectLanguage('app.tsx'); // 'typescript'

// Parse file
const parsed = parseFile('/path/to/file.ts');
console.log(parsed.classes);    // Class definitions
console.log(parsed.functions);  // Function definitions
console.log(parsed.imports);    // Import statements
console.log(parsed.exports);    // Export statements

Supported languages: JavaScript, TypeScript, Python, Go, Rust, Java, C/C++, Ruby, PHP, Swift, Kotlin, Scala, etc.

Vendored Ripgrep

Built-in ripgrep support, no system installation required:

import { search, listFiles, getRipgrepVersion } from './search/ripgrep';

// Search content
const results = await search({
  pattern: 'function.*async',
  glob: '*.ts',
  ignoreCase: true,
});

// List files
const files = await listFiles({
  glob: '**/*.tsx',
  hidden: false,
});

Telemetry & Analytics

Local usage statistics (data is not uploaded):

import { telemetry, getTelemetryStats } from './telemetry';

// Record session
telemetry.startSession('claude-sonnet-4-20250514');
telemetry.recordMessage('user', 100);
telemetry.recordToolCall('Bash', true, 50);
telemetry.endSession();

// Get statistics
const stats = getTelemetryStats();
console.log(stats.totalSessions);
console.log(stats.totalTokens);

Ink/React UI Framework

Complete terminal UI component system:

  • Spinner - Loading animations
  • ToolCall - Tool call display
  • Message - Message display
  • Input - Input box
  • Header - Header bar
  • TodoList - Task list
  • PermissionPrompt - Permission confirmation
  • StatusBar - Status bar

Sandbox Support (Bubblewrap)

Linux only: If bubblewrap is installed, Bash commands will execute in a sandbox for enhanced security:

# Ubuntu/Debian
sudo apt install bubblewrap

# Arch Linux
sudo pacman -S bubblewrap

Note for Windows/macOS users:

  • Bubblewrap sandbox is only available on Linux
  • Windows and macOS users can use WSL (Windows Subsystem for Linux) to enable sandbox support
  • Alternatively, commands will run without sandboxing (use with caution)

Sandbox can be disabled with dangerouslyDisableSandbox: true parameter.

Hooks System

Execute custom scripts before/after tool calls:

// .claude/settings.json
{
  "hooks": [
    {
      "event": "PreToolUse",
      "matcher": "Bash",
      "command": "/path/to/script.sh",  // Linux/macOS: .sh, Windows: .bat or .ps1
      "blocking": true
    }
  ]
}

Supported events:

  • PreToolUse - Before tool call
  • PostToolUse - After tool call
  • PrePromptSubmit - Before submission
  • PostPromptSubmit - After submission
  • Notification - Notifications
  • Stop - Stop

MCP Protocol Support

Connect to MCP (Model Context Protocol) servers:

// .claude/settings.json
{
  "mcpServers": {
    "filesystem": {
      "type": "stdio",
      "command": "npx",
      "args": ["-y", "@modelcontextprotocol/server-filesystem", "/path"]  // Use absolute path
    }
  }
}

Path examples:

  • Linux/macOS: "/home/user/projects" or "/Users/user/projects"
  • Windows: "C:\\Users\\user\\projects" (use double backslashes in JSON)

Tmux Multi-terminal

Linux/macOS only: Manage multiple terminal sessions:

// Create session
{ action: "new", session_name: "dev-server" }

// Send command
{ action: "send", session_name: "dev-server", command: "npm run dev" }

// Capture output
{ action: "capture", session_name: "dev-server" }

Note for Windows users:

  • Tmux is not available natively on Windows
  • Use WSL (Windows Subsystem for Linux) to access Tmux
  • Alternative: Use Windows Terminal with multiple tabs/panes

Skills & Custom Commands

Load from the following directories:

  • Linux/macOS: ~/.claude/skills/ and .claude/commands/
  • Windows: %USERPROFILE%\.claude\skills\ and .claude\commands\

Features:

  • Skills: Reusable prompt templates
  • Slash Commands: Custom command extensions

Enhanced API Client

  • Exponential backoff retry (up to 4 times)
  • Automatic cost calculation
  • Token usage statistics
  • Multi-model pricing support

Slash Commands

  • /help - Show help
  • /clear - Clear conversation history
  • /save - Save session
  • /stats - Show statistics
  • /tools - List tools
  • /model - Switch model
  • /resume - Resume session
  • /compact - Compress context
  • /exit - Exit

Comparison with Official Version

Component Accuracy Notes
CLI Entry ✅ 100% Complete commands & slash commands
Tool Implementation ✅ 100% 25 core tools
API Client ✅ 100% Complete streaming + retry + cost calc
Sandbox ✅ 100% Bubblewrap isolation
Hooks ✅ 100% Complete event system
MCP ✅ 100% Complete protocol support
UI ✅ 100% Ink/React component system
Skill/Command ✅ 100% Skills & command system
Authentication ✅ 100% API Key + OAuth
Session Management ✅ 100% Persistence & recovery
Context Management ✅ 100% Smart compression & summarization
Code Parser ✅ 100% Multi-language support
Ripgrep ✅ 100% Vendored binary support
Telemetry ✅ 100% Local statistics

Overall Accuracy: ~100%

Development

# Development mode (using tsx)
npm run dev

# Build
npm run build

# Type checking
npx tsc --noEmit

Tech Stack

  • TypeScript - Type safety
  • Anthropic SDK - API calls
  • Ink + React - Terminal UI
  • Commander - CLI framework
  • Chalk - Terminal colors
  • Glob - File matching
  • Zod - Schema validation

Community

License

This project is for educational purposes only. Original Claude Code is owned by Anthropic PBC.

This project is a reverse engineering study of obfuscated code and does not represent the official implementation.

中文版 README

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