This repository mirrors a publicly exposed Claude Code source snapshot that became accessible on March 31, 2026 through a source map exposure in the npm distribution. It is maintained for educational, defensive security research, and software supply-chain analysis.
This repository is maintained by a university student studying:
- software supply-chain exposure and build artifact leaks
- secure software engineering practices
- agentic developer tooling architecture
- defensive analysis of real-world CLI systems
This archive is intended to support:
- educational study
- security research practice
- architecture review
- discussion of packaging and release-process failures
It does not claim ownership of the original code, and it should not be interpreted as an official Anthropic repository.
Chaofan Shou (@Fried_rice) publicly noted that Claude Code source material was reachable through a .map file exposed in the npm package:
"Claude code source code has been leaked via a map file in their npm registry!"
The published source map referenced unobfuscated TypeScript sources hosted in Anthropic's R2 storage bucket, which made the src/ snapshot publicly downloadable.
Claude Code is Anthropic's CLI for interacting with Claude from the terminal to perform software engineering tasks such as editing files, running commands, searching codebases, and coordinating workflows.
This repository contains a mirrored src/ snapshot for research and analysis.
- Public exposure identified on: 2026-03-31
- Language: TypeScript
- Runtime: Bun
- Terminal UI: React + Ink
- Scale: ~1,900 files, 512,000+ lines of code
src/
├── main.tsx # Entrypoint orchestration (Commander.js-based CLI path)
├── 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/ # Slash command implementations (~50)
├── tools/ # Agent tool implementations (~40)
├── components/ # Ink UI components (~140)
├── hooks/ # React hooks
├── services/ # External service integrations
├── screens/ # Full-screen UIs (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/ # Keybinding configuration
├── vim/ # Vim mode
├── voice/ # Voice input
├── remote/ # Remote sessions
├── server/ # Server mode
├── memdir/ # Persistent memory directory
├── tasks/ # Task management
├── state/ # State management
├── migrations/ # Config migrations
├── schemas/ # Config schemas (Zod)
├── entrypoints/ # Initialization logic
├── ink/ # Ink renderer wrapper
├── buddy/ # Companion sprite
├── native-ts/ # Native TypeScript utilities
├── outputStyles/ # Output styling
├── query/ # Query pipeline
└── upstreamproxy/ # Proxy configuration
Every tool Claude Code can invoke is implemented as a self-contained module. Each tool defines its input schema, permission model, and execution logic.
| Tool | Description |
|---|---|
BashTool |
Shell command execution |
FileReadTool |
File reading (images, PDFs, notebooks) |
FileWriteTool |
File creation / overwrite |
FileEditTool |
Partial file modification (string replacement) |
GlobTool |
File pattern matching search |
GrepTool |
ripgrep-based content search |
WebFetchTool |
Fetch URL content |
WebSearchTool |
Web search |
AgentTool |
Sub-agent spawning |
SkillTool |
Skill execution |
MCPTool |
MCP server tool invocation |
LSPTool |
Language Server Protocol integration |
NotebookEditTool |
Jupyter notebook editing |
TaskCreateTool / TaskUpdateTool |
Task creation and management |
SendMessageTool |
Inter-agent messaging |
TeamCreateTool / TeamDeleteTool |
Team agent management |
EnterPlanModeTool / ExitPlanModeTool |
Plan mode toggle |
EnterWorktreeTool / ExitWorktreeTool |
Git worktree isolation |
ToolSearchTool |
Deferred tool discovery |
CronCreateTool |
Scheduled trigger creation |
RemoteTriggerTool |
Remote trigger |
SleepTool |
Proactive mode wait |
SyntheticOutputTool |
Structured output generation |
User-facing slash commands invoked with / prefix.
| Command | Description |
|---|---|
/commit |
Create a git commit |
/review |
Code review |
/compact |
Context compression |
/mcp |
MCP server management |
/config |
Settings management |
/doctor |
Environment diagnostics |
/login / /logout |
Authentication |
/memory |
Persistent memory management |
/skills |
Skill management |
/tasks |
Task management |
/vim |
Vim mode toggle |
/diff |
View changes |
/cost |
Check usage cost |
/theme |
Change theme |
/context |
Context visualization |
/pr_comments |
View PR comments |
/resume |
Restore previous session |
/share |
Share session |
/desktop |
Desktop app handoff |
/mobile |
Mobile app handoff |
| Service | Description |
|---|---|
api/ |
Anthropic API client, file API, bootstrap |
mcp/ |
Model Context Protocol server connection and management |
oauth/ |
OAuth 2.0 authentication flow |
lsp/ |
Language Server Protocol manager |
analytics/ |
GrowthBook-based feature flags and analytics |
plugins/ |
Plugin loader |
compact/ |
Conversation context compression |
policyLimits/ |
Organization policy limits |
remoteManagedSettings/ |
Remote managed settings |
extractMemories/ |
Automatic memory extraction |
tokenEstimation.ts |
Token count estimation |
teamMemorySync/ |
Team memory synchronization |
A bidirectional communication layer connecting IDE extensions (VS Code, JetBrains) with the Claude Code CLI.
bridgeMain.ts— Bridge main loopbridgeMessaging.ts— Message protocolbridgePermissionCallbacks.ts— Permission callbacksreplBridge.ts— REPL session bridgejwtUtils.ts— JWT-based authenticationsessionRunner.ts— Session execution management
Checks permissions on every tool invocation. Either prompts the user for approval/denial or automatically resolves based on the configured permission mode (default, plan, bypassPermissions, auto, etc.).
Dead code elimination via Bun's bun:bundle feature flags:
import { feature } from 'bun:bundle'
// Inactive code is completely stripped at build time
const voiceCommand = feature('VOICE_MODE')
? require('./commands/voice/index.js').default
: nullNotable flags: PROACTIVE, KAIROS, BRIDGE_MODE, DAEMON, VOICE_MODE, AGENT_TRIGGERS, MONITOR_TOOL
The core engine for LLM API calls. Handles streaming responses, tool-call loops, thinking mode, retry logic, and token counting.
Defines base types and interfaces for all tools — input schemas, permission models, and progress state types.
Manages registration and execution of all slash commands. Uses conditional imports to load different command sets per environment.
Commander.js-based CLI parser and React/Ink renderer initialization. At startup, it overlaps MDM settings, keychain prefetch, and GrowthBook initialization for faster boot.
| Category | Technology |
|---|---|
| Runtime | Bun |
| Language | TypeScript (strict) |
| Terminal UI | React + Ink |
| CLI Parsing | Commander.js (extra-typings) |
| Schema Validation | Zod v4 |
| Code Search | ripgrep |
| Protocols | MCP SDK, LSP |
| API | Anthropic SDK |
| Telemetry | OpenTelemetry + gRPC |
| Feature Flags | GrowthBook |
| Auth | OAuth 2.0, JWT, macOS Keychain |
Startup time is optimized by prefetching MDM settings, keychain reads, and API preconnect in parallel before heavy module evaluation begins.
// main.tsx — fired as side-effects before other imports
startMdmRawRead()
startKeychainPrefetch()Heavy modules (OpenTelemetry, gRPC, analytics, and some feature-gated subsystems) are deferred via dynamic import() until actually needed.
Sub-agents are spawned via AgentTool, with coordinator/ handling multi-agent orchestration. TeamCreateTool enables team-level parallel work.
Reusable workflows defined in skills/ are executed through SkillTool. Users can add custom skills.
Built-in and third-party plugins are loaded through the plugins/ subsystem.
- This repository is an educational and defensive security research archive maintained by a university student.
- It exists to study source exposure, packaging failures, and the architecture of modern agentic CLI systems.
- The original Claude Code source remains the property of Anthropic.
- This repository is not affiliated with, endorsed by, or maintained by Anthropic.