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Claude Code is Anthropic’s official CLI tool for interacting with Claude directly from your terminal. It edits files, runs commands, searches codebases, manages git workflows, and orchestrates multi-agent tasks — all through natural language. This documentation covers the full leaked source from March 31, 2026.

Quick Start

Get Claude Code running and explore the source in minutes

Architecture Overview

Understand the core pipeline: CLI → Query Engine → Tools → UI

Tools Reference

Complete catalog of all 40+ agent tools with permissions and usage

Commands Reference

All 85+ slash commands organized by category

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What is Claude Code?

Claude Code is a terminal-native AI coding assistant built as a single-binary CLI. It uses a React + Ink UI layer rendered in the terminal, a streaming Query Engine that manages LLM tool-call loops, and a rich ecosystem of tools that give Claude the ability to read files, run shell commands, search the web, spawn sub-agents, and integrate with your IDE.

40+ Agent Tools

File I/O, shell execution, web search, LSP, MCP, and more

85+ Slash Commands

Git, code review, session management, configuration

MCP Support

Acts as both MCP client and MCP server

Plugin System

Extend with custom plugins and reusable skills

Multi-Agent

Spawn teams of parallel agents for complex tasks

IDE Bridge

Deep integration with VS Code and JetBrains

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Explore the source

This repository contains the full leaked src/ directory (~1,900 files, 512,000+ lines of TypeScript). Use the MCP Explorer server to navigate it interactively from any AI assistant.

MCP Explorer Server

Install the claude-code-explorer-mcp package to explore source code interactively

Exploration Guide

Study paths, grep patterns, and key files for understanding the codebase
The src/ directory is the original leaked source and should not be modified. Contributions to documentation, the MCP server, and exploration tooling are welcome.

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