Inside the Claude Code Source Leak That Attracted 15 Million Views

On March 31 2026 a Twitter user reported that the Claude Code npm package contained a .map file exposing the complete, un‑obfuscated TypeScript source, which could be downloaded as a zip from Anthropic’s R2 bucket.

A Korean developer, identified as sigridjineth, backed up the leaked version, prompting a surge of over 50 000 forks on GitHub within hours. Fearing legal action from Anthropic, the developer rewrote the code in Python using the oh‑my‑codex (OmX) workflow, employing a large language model for parallel code review and architect‑level validation.

The original leaked repository is available at https://github.com/instructkr/claude-code, while the Python rewrite resides at https://github.com/Yeachan-Heo/oh-my-codex. The leaked repo no longer contains the original source code.

Community members have produced additional resources, including a "Claude Code Design Guide" ( https://github.com/6551Team/claude-code-design-guide) and a "Claude Code Deep Dive Report" ( https://github.com/tvytlx/claude-code-deep-dive), both analyzing the design philosophy and hidden features of the tool.

The leaked codebase implements a CLI for interacting with Claude from the terminal, supporting file editing, command execution, code‑base search, and workflow coordination.

Key data: exposure date 2026‑03‑31; language TypeScript; runtime Bun; terminal UI built with React + Ink; approximately 1 900 files and over 512 000 lines of code.

src/
├── main.tsx               # entry point (Commander.js CLI routing)
├── commands.ts            # command registry
├── tools.ts               # tool registry
├── Tool.ts                # tool type definitions
├── QueryEngine.ts         # LLM query engine
├── context.ts            # system/user context collection
├── cost-tracker.ts       # token cost tracking
│
├── commands/              # ~50 slash command implementations
├── tools/                 # ~40 agent tool implementations
├── components/            # ~140 Ink UI components
├── hooks/                 # React hooks
├── services/              # external service integrations
├── screens/               # full‑screen UI (Doctor, REPL, Resume)
├── types/                 # TypeScript type definitions
├── utils/                 # utility functions
│
├── bridge/                # IDE and remote control bridge
├── coordinator/           # multi‑agent coordinator
├── plugins/               # plugin system
├── skills/                # skill system
├── keybindings/           # key‑binding configuration
├── vim/                   # Vim mode
├── voice/                 # voice input
├── remote/                # remote session
├── server/                # server mode
├── memdir/                # persistent memory directory
├── tasks/                 # task management
├── state/                 # state management
├── migrations/            # configuration migrations
├── schemas/               # Zod configuration schemas
├── entrypoints/           # initialization logic
├── ink/                   # Ink renderer wrapper
├── buddy/                 # companion bot
├── native‑ts/             # native TypeScript utilities
├── outputStyles/          # output styling
├── query/                 # query pipeline
└── upstreamproxy/         # proxy configuration

Related resources include the official GitHub repository ( https://github.com/instructkr/claude-code) and the OmX project ( https://github.com/Yeachan-Heo/oh-my-codex). Technical references cited are Bun, React Ink, Commander.js, Zod, the Model Context Protocol, and the Anthropic SDK.

Important reminder: This article is intended solely to disclose the incident and should not be interpreted as encouraging or supporting any illegal activity.