This repository provides a comprehensive, source-code-level analysis of Anthropic's Claude Code CLI, a complex terminal AI agent. Aimed at developers and engineers, it offers deep insights into the system's architecture, engineering practices, and design philosophy, enabling a thorough understanding of its internal mechanisms.

How It Works

The project systematically dissects Claude Code's real source code, eschewing superficial descriptions for in-depth analysis of design decisions and engineering trade-offs. It employs 101 Mermaid diagrams to visualize architecture, flow, and state, complemented by 467 commented TypeScript code blocks. The analysis spans foundational architecture, core engines, tool systems, agent orchestration, security, protocols, state management, and UI implementation.

Quick Start & Requirements

• Installation: Requires mdBook. Install via Homebrew: brew install mdbook.
• Build: Execute mdbook build to generate static site files.
• Local Preview: Run mdbook serve --open for live preview.
• Subject Technology Stack: Analyzes Claude Code built with Bun (runtime), React + Ink (terminal UI), Zustand-like Store (state management), Zod Schema (type validation), MCP protocol, and Bun Bundle (build).

Highlighted Details

• Analysis grounded in direct, real source code citations.
• Extensive visual aids: 101 Mermaid diagrams covering architecture, sequence, and flow.
• Detailed code exposition: 467 TypeScript code blocks with syntax highlighting and annotations.
• Focus on design rationale and engineering trade-offs.
• Content includes 25 chapters, 2 appendices, a 55-term glossary, and source code navigation for over 90 files.

Maintenance & Community

• Contributions are welcomed via GitHub Issues for reporting errors or suggesting improvements, and Pull Requests for direct content enhancements.

Licensing & Compatibility

• License: CC BY-NC-SA 4.0 International.
• Restrictions: This license prohibits commercial use and requires derivative works to be shared under the same or a compatible license.

Limitations & Caveats

• The content is a deep dive into a specific tool (Claude Code) and its underlying technologies.
• The CC BY-NC-SA 4.0 license restricts usage to non-commercial purposes.