https://github.com/yasasbanukaofficial/claude-code
🚀 Open source Claude Code CLI source code. Advanced AI Agent for developers. Includes TypeScript codebase for LLM tool-calling, agentic workflows, and terminal UI. Remember this is just the skeleton not the brain itself. Found by Chaofan Shou.
https://github.com/yasasbanukaofficial/claude-code
claude-ai claude-code leaked-claude-code leaked-code
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🚀 Open source Claude Code CLI source code. Advanced AI Agent for developers. Includes TypeScript codebase for LLM tool-calling, agentic workflows, and terminal UI. Remember this is just the skeleton not the brain itself. Found by Chaofan Shou.
- Host: GitHub
- URL: https://github.com/yasasbanukaofficial/claude-code
- Owner: yasasbanukaofficial
- Created: 2026-03-31T19:07:10.000Z (6 days ago)
- Default Branch: main
- Last Pushed: 2026-04-02T02:45:20.000Z (5 days ago)
- Last Synced: 2026-04-04T16:40:07.760Z (2 days ago)
- Topics: claude-ai, claude-code, leaked-claude-code, leaked-code
- Language: TypeScript
- Homepage: https://github.com/yasasbanukaofficial/claude-code
- Size: 9.38 MB
- Stars: 1,411
- Watchers: 12
- Forks: 2,566
- Open Issues: 3
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# Claude Code's Entire Source Code Got Leaked via a Sourcemap in npm, Let's Talk About It
> **PS:** This breakdown is also available on [this blog](https://kuber.studio/blog/AI/Claude-Code's-Entire-Source-Code-Got-Leaked-via-a-Sourcemap-in-npm,-Let's-Talk-About-it) with a better reading experience and UX :)
> **Note:** There's a non-zero chance this repo might be taken down. If you want to play around with it later or archive it yourself, feel free to **fork it** and bookmark the external blog link!
---
## ⚠️ Important Disclaimer
**I did not leak these files.** I have simply provided an easy, documented way to access and study this codebase for research purposes. All files and information originate from public findings shared on Twitter/X. All credit for the discovery goes to the original source.
---
Earlier today (March 31st, 2026) - **Chaofan Shou (@Fried_rice)** discovered something that Anthropic probably didn't want the world to see: the **entire source code** of Claude Code, Anthropic's official AI coding CLI, was sitting in plain sight on the npm registry via a sourcemap file bundled into the published package.
[](https://x.com/Fried_rice/status/2038894956459290963)
This repository is a backup of that leaked source, providing a full breakdown of what's in it, how the leak happened, and the internal systems that were never meant to be public.
---
## 🧐 How Did This Even Happen?
When you publish a JavaScript/TypeScript package to npm, the build toolchain often generates **source map files** (`.map` files). These files bridge minified production code and the original source for debugging.
The catch? **Source maps contain the original source code** embedded as strings inside a JSON file under the `sourcesContent` key.
```json
{
"version": 3,
"sources": ["../src/main.tsx", "../src/tools/BashTool.ts", "..."],
"sourcesContent": ["// The ENTIRE original source code of each file", "..."],
"mappings": "AAAA,SAAS,OAAO..."
}
```
By forgetting to add `*.map` to `.npmignore` or failing to disable source maps in production builds (Bun's default behavior), the entire raw source was shipped to the npm registry.
[](assets/claude-npm-img.png)
---
## 🛠 What's Under the Hood?
Claude Code is not just a simple CLI. It's a massive **785KB `main.tsx`** entry point featuring a custom React terminal renderer (Ink), 40+ tools, and complex multi-agent orchestration.
### 🐣 BUDDY - The Terminal Tamagotchi
Inside [`src/buddy/`](./src/buddy/), there is a full **Tamagotchi-style companion system**.
- **Deterministic Gacha:** Uses a Mulberry32 PRNG seeded from your `userId`.
- **18 Species:** Ranging from Common (*Pebblecrab*) to Legendary (*Nebulynx*).
- **Stats & Souls:** Every buddy has stats like `DEBUGGING`, `CHAOS`, and `SNARK`, with a "soul" description written by Claude.
### 🕵️♂️ Undercover Mode - "Do Not Blow Your Cover"
Anthropic employees use Claude Code to contribute to public repos. **Undercover Mode** ([`src/utils/undercover.ts`](./src/utils/undercover.ts)) prevents the AI from leaking internal info:
- Blocks internal model codenames (e.g., *Capybara*, *Tengu*).
- Hides the fact that the user is an AI.
- Confirms that **"Tengu"** is likely the internal codename for Claude Code.
### 🌙 The "Dream" System
Claude Code "dreams" to consolidate memory. The **autoDream** service ([`src/services/autoDream/`](./src/services/autoDream/)) runs as a background subagent to:
1. **Orient:** Read `MEMORY.md`.
2. **Gather:** Find new signals from daily logs.
3. **Consolidate:** Update durable memory files.
4. **Prune:** Keep context efficient.
### 🚀 KAIROS & ULTRAPLAN
- **KAIROS:** An "always-on" proactive assistant that watches logs and acts without waiting for input.
- **ULTRAPLAN:** Offloads complex tasks to a remote **Opus 4.6** session for up to 30 minutes of deep planning.
---
## 📂 Architecture & Directory Structure
```text
src/
├── main.tsx # CLI Entrypoint (Commander.js + React/Ink)
├── QueryEngine.ts # Core LLM logic (~46K lines)
├── Tool.ts # Base tool definitions
├── tools/ # 40+ Agent tools (Bash, Files, LSP, Web)
├── services/ # Backend (MCP, OAuth, Analytics, Dreams)
├── coordinator/ # Multi-agent orchestration (Swarm)
├── bridge/ # IDE Integration layer
└── buddy/ # The secret Tamagotchi system
```
---
## ⚙️ How to Use & Explore
### 📦 Prerequisites
- **[Bun Runtime](https://bun.sh)** (Highly Recommended) or Node.js v18+
- **TypeScript** installed globally
### 🚀 Getting Started
1. **Clone the repository:**
```bash
git clone https://github.com/your-username/claude-leaked.git
cd claude-leaked
```
2. **Install Dependencies:**
```bash
npm install
```
3. **Build the Project:**
```bash
npm run build
```
4. **Run the CLI:**
```bash
node dist/main.js
```
### 🔍 Explore with MCP
This repo includes an **MCP Server** to let you explore the source using Claude itself:
```bash
claude mcp add code-explorer -- npx -y claude-code-explorer-mcp
```
---
## 📈 SEO & Rankings
**Keywords:** `Claude Code Leak`, `Anthropic Source Code`, `AI Agent Framework`, `Claude 3.5 Sonnet CLI`, `Tengu Anthropic`, `npm sourcemap leak`, `Open Source AI Agent`.
---
## 📜 Credits & Legal
- **Discovery:** [Chaofan Shou (@Fried_rice)](https://x.com/Fried_rice)
- **Source Post:** [Twitter/X Announcement](https://x.com/Fried_rice/status/2038894956459290963)
- **Author of this Mirror:** [Yasas Banu](https://www.yasasbanuka.tech)
**Disclaimer:** All original source code is the proprietary property of **Anthropic PBC**. This repository is for educational and archival purposes only. **This is not an official Anthropic product.**
---
### 📩 Contact
For spamming reasons the email has been removed.