Claude Code

An AI-powered coding assistant that runs in your terminal, built with TypeScript and React (Ink).

At a Glance

Documentation Sections

Architecture

High-level design: entry point, query engine, state management, terminal UI, and feature flags.

Commands

The command system: 103+ built-in commands, slash commands, and custom command extensions.

Tools

45+ development tools: file operations, bash execution, multi-agent delegation, MCP integration, and the permission system.

Subsystems

Major subsystems: MCP, skills, plugins, remote bridge, vim mode, coordinator, and session management.

Services

Service layer: API communication, analytics, LSP integration, and OAuth.

Internals

Deep internals: Ink rendering engine, React hooks catalog, keybindings, utilities, memory files, and constants.

Tech Stack

• Runtime: Bun / Node.js
• Language: TypeScript (strict)
• UI Framework: React via custom Ink engine
• AI Backend: Claude API (streaming)
• Extension Protocol: Model Context Protocol (MCP)
• Build: Bun bundler with feature flag dead-code elimination