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# Claude Code — Source Code Documentation & Analysis
> **Claude Code** is Anthropic's official CLI for Claude. This document provides a comprehensive reverse-engineering analysis of its source code architecture, modules, and internal design patterns.
---
## How to Read This Document
This document is the result of a deep-dive analysis into the Claude Code source tree. It is intended for **developers and engineers** who want to understand how Claude Code works under the hood — its architecture, module boundaries, data flow, and design decisions.
**Structure:** The document is organized top-down, starting with the project overview and technology stack, then drilling into each major subsystem (tools, commands, state, services, UI). Each section is self-contained; you can jump to any section via the Table of Contents.
**Audience:** Intermediate-to-advanced developers familiar with TypeScript, React, and CLI tooling. Prior experience with AI/LLM tooling is helpful but not required.
**Scope:** This covers the source tree structure, module inventory, and architectural patterns. It does not cover runtime behavior in depth, nor does it include performance benchmarks or security audits.
---
## Table of Contents
1. [Project Overview](#1-project-overview)
2. [Technology Stack](#2-technology-stack)
3. [Directory Structure](#3-directory-structure)
4. [Entry Points](#4-entry-points)
5. [Core Architecture](#5-core-architecture)
6. [Tool System](#6-tool-system)
7. [Command System](#7-command-system)
8. [State Management](#8-state-management)
9. [Task System](#9-task-system)
10. [Services & Integrations](#10-services--integrations)
11. [UI Layer](#11-ui-layer)
12. [Utilities](#12-utilities)
13. [Special Modes](#13-special-modes)
14. [Plugins & Skills](#14-plugins--skills)
15. [Hooks & Extensibility](#15-hooks--extensibility)
16. [File Statistics](#16-file-statistics)
17. [Architectural Patterns](#17-architectural-patterns)
---
## 1. Project Overview
Claude Code is a feature-rich, interactive terminal application that enables AI-assisted software engineering directly from the command line. It provides:
- **Interactive REPL** for conversing with Claude about code
- **40+ tools** for file operations, shell execution, web search, and more
- **100+ slash commands** for workflows like committing, reviewing, debugging
- **Agent/task system** for parallelizing complex work across sub-agents
- **Plan mode** for designing implementation strategies before coding
- **MCP (Model Context Protocol)** integration for extensible server-side tools
- **Plugin & skill system** for user-defined extensions
- **Voice mode**, **desktop/mobile bridges**, and **remote sessions**
---
## 2. Technology Stack
| Layer | Technology |
|----------------|--------------------------------------------------------------|
| Language | TypeScript (`.ts` / `.tsx`) |
| Runtime | Bun (bundler, feature flags via `bun:bundle`) |
| UI Framework | React + [Ink](https://github.com/vadimdemedes/ink) (terminal React renderer) |
| API Client | `@anthropic-ai/sdk` (Anthropic SDK) |
| MCP | `@modelcontextprotocol/sdk` |
| CLI Framework | `@commander-js/extra-typings` |
| Validation | Zod v4 |
| Styling | Chalk (terminal colors) |
| State | Zustand-style store + React Context |
---
## 3. Directory Structure
```text
claude-code-analysis/
└── src/ # All source code (single top-level directory)
├── main.tsx # Primary bootstrap & initialization
├── QueryEngine.ts # Conversation loop orchestrator
├── Tool.ts # Tool type definitions & interfaces
├── Task.ts # Task type definitions & lifecycle
├── commands.ts # Command registry
├── tools.ts # Tool registry & factory
├── context.ts # System/user context builder
├── query.ts # Query context preparation
├── setup.ts # Setup phase orchestration
├── history.ts # Chat session history
├── cost-tracker.ts # Token usage & pricing
├── ink.ts # Ink rendering wrapper
├── replLauncher.tsx # REPL React component launcher
├── tasks.ts # Task execution manager
│
├── commands/ # 101 command modules (slash commands)
├── tools/ # 41 tool implementations
├── services/ # Core services (API, MCP, analytics, etc.)
├── components/ # React/Ink UI components (130+ files)
├── utils/ # Utility functions (300+ files)
├── state/ # Application state management
├── types/ # TypeScript type definitions
├── hooks/ # React hooks
├── schemas/ # Zod validation schemas
├── tasks/ # Task type implementations
├── entrypoints/ # Entry point definitions (CLI, SDK, MCP)
├── bootstrap/ # Application startup & global state
├── screens/ # Full-screen UI layouts
├── plugins/ # Plugin system (bundled plugins)
├── skills/ # Custom skill system (bundled skills)
├── memdir/ # Memory directory auto-discovery
├── constants/ # Application constants
├── migrations/ # Data/schema migrations
├── ink/ # Ink terminal customizations
├── keybindings/ # Keyboard binding system
├── context/ # React contexts (mailbox, notifications)
├── query/ # Query processing modules
├── outputStyles/ # Output formatting styles
├── vim/ # Vim mode integration
├── voice/ # Voice input/output
├── native-ts/ # Native TypeScript bindings
├── assistant/ # Kairos (assistant) mode
├── bridge/ # Bridge mode (always-on remote)
├── buddy/ # Buddy/teammate system
├── coordinator/ # Multi-agent coordination
├── remote/ # Remote session handling
├── server/ # Server implementation
├── cli/ # CLI argument parsing
└── upstreamproxy/ # Upstream proxy setup
```
---
## 4. Entry Points
### Primary Entry: `src/main.tsx`
The main bootstrap file (~1,400 lines). Performs:
1. **Startup profiling** via `startupProfiler.ts`
2. **MDM (Mobile Device Management)** raw read prefetch
3. **Keychain prefetch** (macOS OAuth + API key reads in parallel)
4. **Feature flag initialization** via Bun's `feature()` for dead code elimination
5. **CLI argument parsing** via Commander.js
6. **Authentication** (API key, OAuth, AWS Bedrock, GCP Vertex, Azure)
7. **GrowthBook** initialization (A/B testing & feature flags)
8. **Policy limits** and **remote managed settings** loading
9. **Tool, command, skill, and MCP server** registration
10. **REPL launch** via `replLauncher.tsx`
### Other Entry Points (`src/entrypoints/`)
| File | Purpose |
|---------------------|----------------------------------------------|
| `cli.tsx` | CLI entry point with React/Ink UI rendering |
| `init.ts` | Bootstrap initialization, version checks |
| `mcp.ts` | Model Context Protocol integration |
| `agentSdkTypes.ts` | Type definitions for the Agent SDK |
| `sandboxTypes.ts` | Sandbox execution environment types |
| `sdk/` | SDK-related implementations |
### Setup Phase: `src/setup.ts`
Orchestrates:
- Node.js version validation
- Worktree initialization
- Session & permission mode setup
- Git root detection
- UDS messaging server startup
---
## 5. Core Architecture
### 5.1 Query Engine (`src/QueryEngine.ts`)
The heart of the application (~46KB). Manages the conversation loop between user and Claude:
- **Message management** — maintains conversation history with user, assistant, system, and tool messages
- **Streaming** — real-time token streaming with tool use execution
- **Auto-compaction** — automatically compresses context when approaching window limits
- **Prompt caching** — optimizes repeated context through cache-aware strategies
- **Retry logic** — handles API errors, rate limits, and overload with backoff
- **Usage tracking** — counts tokens (input/output/cache read/write) and costs
- **Tool orchestration** — dispatches tool calls, collects results, manages permissions
### 5.2 Context Builder (`src/context.ts`, `src/query.ts`)
Prepares the system prompt and user context:
- Discovers and merges `CLAUDE.md` files (project, user, global)
- Builds system context (OS, shell, platform, git status)
- Integrates user context (permissions, working directories)
- Caches context for performance across queries
### 5.3 Cost Tracking (`src/cost-tracker.ts`)
Tracks per-session costs:
- Token counting by model (input, output, cache read/write)
- USD cost calculation via pricing tables
- Session duration tracking
- Web search request counting
- File change metrics
---
## 6. Tool System
### Architecture (`src/Tool.ts`, `src/tools.ts`)
Each tool is a self-contained module with:
- **JSON Schema** input validation
- **Permission model** (ask/allow/deny modes)
- **Progress tracking** types
- **Error handling** and user prompting
### Complete Tool Inventory (41 tools)
#### File Operations
| Tool | Purpose |
|-------------------|--------------------------------------------|
| `FileReadTool` | Read file contents with line ranges |
| `FileWriteTool` | Create or overwrite files |
| `FileEditTool` | Exact string replacement edits |
| `GlobTool` | Pattern-based file matching |
| `GrepTool` | Content search with regex (ripgrep-based) |
#### Code Execution
| Tool | Purpose |
|-------------------|--------------------------------------------|
| `BashTool` | Execute shell commands with timeout |
| `PowerShellTool` | Execute PowerShell commands (Windows) |
| `REPLTool` | Execute Python code (internal only) |
| `NotebookEditTool`| Jupyter notebook cell operations |
#### Web & Search
| Tool | Purpose |
|-------------------|--------------------------------------------|
| `WebFetchTool` | Fetch and parse web content |
| `WebSearchTool` | Search the internet |
| `ToolSearchTool` | Search available deferred tools |
#### Agent & Task Management
| Tool | Purpose |
|-------------------|--------------------------------------------|
| `AgentTool` | Spawn sub-agents for parallel work |
| `TaskCreateTool` | Create new background tasks |
| `TaskGetTool` | Retrieve task status and results |
| `TaskUpdateTool` | Update task status or description |
| `TaskListTool` | List all tasks and their states |
| `TaskStopTool` | Kill a running task |
| `TaskOutputTool` | Stream/read task output |
| `SendMessageTool` | Send messages to running agents |
#### Planning & Workflow
| Tool | Purpose |
|-------------------|--------------------------------------------|
| `EnterPlanModeTool` | Enter read-only planning mode |
| `ExitPlanModeTool` | Exit planning mode with approval |
| `EnterWorktreeTool` | Create isolated git worktree |
| `ExitWorktreeTool` | Return from worktree with changes |
#### MCP (Model Context Protocol)
| Tool | Purpose |
|-------------------|--------------------------------------------|
| `MCPTool` | Call tools on MCP servers |
| `McpAuthTool` | Authenticate with MCP servers |
| `ListMcpResourcesTool` | List MCP server resources |
| `ReadMcpResourceTool` | Read specific MCP resources |
#### Configuration & System
| Tool | Purpose |
|-------------------|--------------------------------------------|
| `ConfigTool` | Read/modify settings |
| `SkillTool` | Execute user-defined skills |
| `AskUserQuestionTool` | Prompt user for input/clarification |
| `BriefTool` | Generate session briefs |
| `TodoWriteTool` | Manage todo lists |
| `SleepTool` | Pause execution for a duration |
#### Team & Remote
| Tool | Purpose |
|-------------------|--------------------------------------------|
| `TeamCreateTool` | Create agent teams |
| `TeamDeleteTool` | Delete agent teams |
| `RemoteTriggerTool` | Trigger remote task execution |
| `ScheduleCronTool` | Schedule recurring tasks |
| `LSPTool` | Language Server Protocol integration |
#### Internal
| Tool | Purpose |
|-------------------|--------------------------------------------|
| `SyntheticOutputTool` | Synthetic output for structured responses |
---
## 7. Command System
### Registry (`src/commands.ts`)
Commands are modular directories under `src/commands/`, each containing an `index.ts` (or similar) that exports a `Command` definition with name, description, handler, and optional aliases.
### Complete Command Inventory (101 modules)
#### Git & Version Control
`commit`, `commit-push-pr`, `diff`, `branch`, `review`, `autofix-pr`, `pr_comments`, `teleport`, `rewind`, `tag`
#### Session & History
`session`, `resume`, `clear`, `compact`, `export`, `share`, `summary`, `context`
#### Configuration & Settings
`config`, `permissions`, `privacy-settings`, `theme`, `color`, `keybindings`, `vim`, `output-style`, `statusline`, `env`
#### Agent & Task Management
`agents`, `tasks`, `brief`
#### File & Code Operations
`files`, `add-dir`, `diff`, `debug-tool-call`, `copy`
#### Development & Debugging
`doctor`, `heapdump`, `perf-issue`, `stats`, `bughunter`, `ctx_viz`, `ant-trace`
#### Authentication
`login`, `logout`, `oauth-refresh`
#### Extensions & Plugins
`mcp`, `plugin`, `reload-plugins`, `skills`
#### Workspace
`plan`, `sandbox-toggle`, `init`
#### Information & Help
`help`, `version`, `cost`, `usage`, `extra-usage`, `release-notes`, `status`, `insights`
#### Platform Integration
`desktop`, `mobile`, `chrome`, `ide`, `install`, `install-github-app`, `install-slack-app`
#### Memory & Knowledge
`memory`, `good-claude`
#### Model & Performance
`model`, `effort`, `fast`, `thinkback`, `thinkback-play`, `advisor`
#### Special Operations
`bridge`, `voice`, `remote-setup`, `remote-env`, `stickers`, `feedback`, `onboarding`, `passes`, `ultraplan`, `rename`, `exit`
---
## 8. State Management
### Store Architecture (`src/state/`)
| File | Purpose |
|-------------------|------------------------------------------------|
| `AppState.tsx` | React Context provider with `useAppState(selector)` hook |
| `AppStateStore.ts`| Central state shape definition |
| `store.ts` | Zustand-style store implementation |
### Key State Fields
```typescript
{
settings: UserSettings // User configuration from settings.json
mainLoopModel: string // Active Claude model
messages: Message[] // Conversation history
tasks: TaskState[] // Running/completed tasks
toolPermissionContext: { // Permission rules per tool
rules: PermissionRule[]
bypassMode: 'auto' | 'block' | 'ask'
denialTracking: DenialTrackingState
}
kairosEnabled: boolean // Assistant mode flag
remoteConnectionStatus: Status // Remote session connectivity
replBridgeEnabled: boolean // Always-on bridge (CCR) state
speculationState: Cache // Inline speculation cache/preview
}
```
---
## 9. Task System
### Task Types (`src/Task.ts`)
| Type | Description |
|-----------------------|-------------------------------------------------|
| `local_bash` | Local shell command execution |
| `local_agent` | Local sub-agent (spawned via AgentTool) |
| `remote_agent` | Remote agent execution |
| `in_process_teammate` | In-process teammate (shared memory space) |
| `local_workflow` | Local multi-step workflow |
| `monitor_mcp` | MCP server monitoring task |
| `dream` | Auto-dream background task |
### Task Lifecycle
```text
pending -> running -> completed
-> failed
-> killed
```
### Task State Shape
```typescript
{
id: string // Unique ID with type prefix (e.g., "b-xxx" for bash)
type: TaskType
status: TaskStatus
description: string
startTime: number
endTime?: number
outputFile: string // Disk-persisted output
outputOffset: number // Current read position
notified: boolean // Whether completion was reported
}
```
---
## 10. Services & Integrations
### 10.1 API Client (`src/services/api/`)
| File | Purpose |
|-----------------------------|----------------------------------------------|
| `client.ts` | Anthropic SDK client with multi-provider support |
| `claude.ts` | Message streaming & tool use handling |
| `bootstrap.ts` | Bootstrap data fetching on startup |
| `usage.ts` | Token usage recording |
| `errors.ts` / `errorUtils.ts` | Error classification and handling |
| `logging.ts` | API request/response logging |
| `withRetry.ts` | Exponential backoff retry logic |
| `filesApi.ts` | File upload/download |
| `sessionIngress.ts` | Remote session bridging |
| `grove.ts` | Grove integration |
| `referral.ts` | Referral/passes system |
**Supported Providers:**
- Anthropic Direct API
- AWS Bedrock
- Google Cloud Vertex AI
- Azure Foundry
### 10.2 MCP Integration (`src/services/mcp/`)
| File | Purpose |
|-------------------------|------------------------------------------------|
| `client.ts` | MCP client implementation |
| `types.ts` | Server definitions & connection types |
| `config.ts` | Configuration loading & validation |
| `auth.ts` | OAuth/authentication for MCP servers |
| `officialRegistry.ts` | Official MCP server registry |
| `InProcessTransport.ts` | In-process MCP transport |
| `normalization.ts` | URL/config normalization |
| `elicitationHandler.ts` | User prompting via MCP |
### 10.3 Analytics & Telemetry (`src/services/analytics/`)
| File | Purpose |
|-----------------------------|--------------------------------------------|
| `index.ts` | Event logging API |
| `growthbook.ts` | Feature flagging & A/B testing |
| `sink.ts` | Analytics sink configuration |
| `datadog.ts` | Datadog integration |
| `firstPartyEventLogger.ts` | First-party analytics |
| `metadata.ts` | Event metadata enrichment |
### 10.4 Context Compaction (`src/services/compact/`)
| File | Purpose |
|----------------------------|---------------------------------------------|
| `compact.ts` | Full context window compaction |
| `autoCompact.ts` | Automatic compaction triggers |
| `microCompact.ts` | Selective message pruning |
| `compactWarning.ts` | User warnings about compaction |
| `sessionMemoryCompact.ts` | Memory persistence across compaction |
### 10.5 Other Services
| Directory/File | Purpose |
|-------------------------------|-------------------------------------------|
| `SessionMemory/` | Session memory persistence & transcripts |
| `MagicDocs/` | Intelligent documentation generation |
| `AgentSummary/` | Agent execution summaries |
| `PromptSuggestion/` | Suggested follow-up prompts |
| `extractMemories/` | Learning extraction from conversations |
| `plugins/` | Plugin lifecycle management |
| `oauth/` | OAuth client flows |
| `lsp/` | Language Server Protocol client |
| `remoteManagedSettings/` | Remote configuration sync |
| `settingsSync/` | Settings synchronization |
| `teamMemorySync/` | Team memory synchronization |
| `policyLimits/` | Rate limiting & quotas |
| `autoDream/` | Auto-dream background features |
| `tips/` | Contextual tips system |
| `toolUseSummary/` | Tool usage analytics |
| `voice.ts` / `voiceStreamSTT.ts` | Voice input handling |
---
## 11. UI Layer
### Framework
The UI is built with **React** rendered to the terminal via **Ink**. Components use standard React patterns (hooks, context, props) but render to terminal ANSI output instead of DOM.
### Core Application Components
| Component | File | Purpose |
|--------------------|-------------------------------|-------------------------------|
| `App` | `components/App.tsx` | Root application component |
| `REPL` | `screens/REPL.tsx` | Main REPL screen |
| `Messages` | `components/Messages.tsx` | Conversation message list |
| `PromptInput` | `components/PromptInput/` | User input with autocomplete |
| `StatusLine` | `components/StatusLine.tsx` | Bottom status bar |
### Component Categories
#### Message Display
`Message.tsx`, `MessageRow.tsx`, `MessageResponse.tsx`, `MessageModel.tsx`, `MessageTimestamp.tsx`, `MessageSelector.tsx`, `messages/` (subdirectory for specialized message types)
#### Dialog & Modal Components
`TrustDialog/`, `AutoModeOptInDialog.tsx`, `BypassPermissionsModeDialog.tsx`, `CostThresholdDialog.tsx`, `BridgeDialog.tsx`, `ExportDialog.tsx`, `InvalidConfigDialog.tsx`, `InvalidSettingsDialog.tsx`, `ManagedSettingsSecurityDialog/`, `IdeAutoConnectDialog.tsx`, `IdleReturnDialog.tsx`, `WorktreeExitDialog.tsx`, `RemoteEnvironmentDialog.tsx`
#### Code Display
`HighlightedCode/`, `StructuredDiff/`, `FileEditToolDiff.tsx`
#### Settings & Configuration
`Settings/`, `ThemePicker.tsx`, `OutputStylePicker.tsx`, `ModelPicker.tsx`, `LanguagePicker.tsx`
#### Task & Agent UI
`tasks/`, `teams/`, `agents/`, `CoordinatorAgentStatus.tsx`, `TaskListV2.tsx`, `TeammateViewHeader.tsx`
#### Navigation & Search
`GlobalSearchDialog.tsx`, `HistorySearchDialog.tsx`, `QuickOpenDialog.tsx`, `SearchBox.tsx`
#### Design System
`design-system/`, `Spinner/`, `CustomSelect/`, `LogoV2/`, `HelpV2/`
#### Permissions
`permissions/` (role-based access dialogs and prompts)
---
## 12. Utilities
The `src/utils/` directory contains **300+ files** providing low-level functionality. Key categories:
### Git & Version Control
| File/Dir | Purpose |
|-----------------|------------------------------------------------|
| `git.ts` | Git command wrappers |
| `git/` | Extended git utilities |
| `gitDiff.ts` | Diff generation and parsing |
| `gitSettings.ts`| Git instruction toggles |
| `github/` | GitHub API helpers |
| `worktree.ts` | Git worktree automation |
### Shell & Process
| File/Dir | Purpose |
|-----------------|------------------------------------------------|
| `Shell.ts` | Shell execution wrapper |
| `shell/` | Shell configuration and helpers |
| `bash/` | Bash-specific utilities |
| `powershell/` | PowerShell utilities |
| `execFileNoThrow.ts` | Safe process spawning |
| `process.ts` | Process management |
### Authentication & Security
| File/Dir | Purpose |
|-----------------|------------------------------------------------|
| `auth.ts` | API key, OAuth, AWS/GCP credential management |
| `secureStorage/`| Keychain integration (macOS) |
| `permissions/` | Permission rules, filesystem sandboxing |
| `crypto.ts` | Cryptographic utilities |
| `sandbox/` | Sandbox environment |
### Configuration
| File/Dir | Purpose |
|-----------------|------------------------------------------------|
| `config.ts` | `.claude/config.json` management |
| `settings/` | `settings.json` validation & application |
| `env.ts` | Static environment variables |
| `envDynamic.ts` | Dynamic environment detection |
| `envUtils.ts` | Environment variable parsing |
| `managedEnv.ts` | Managed environment configuration |
### File System
| File/Dir | Purpose |
|-----------------|------------------------------------------------|
| `claudemd.ts` | CLAUDE.md auto-discovery and parsing |
| `fileStateCache.ts` | File change tracking |
| `fileHistory.ts`| File snapshots for undo |
| `filePersistence/` | Persistent file storage |
| `glob.ts` | Glob pattern matching |
| `ripgrep.ts` | Ripgrep integration |
### AI & Model
| File/Dir | Purpose |
|-----------------|------------------------------------------------|
| `model/` | Model selection & context window management |
| `modelCost.ts` | Token pricing tables |
| `thinking.ts` | Extended thinking mode configuration |
| `effort.ts` | Task effort level management |
| `fastMode.ts` | Speed optimization mode |
| `advisor.ts` | AI advisor integration |
| `tokens.ts` | Token counting and estimation |
### Agent & Swarm
| File/Dir | Purpose |
|-----------------|------------------------------------------------|
| `swarm/` | Multi-agent swarm coordination |
| `teammate.ts` | Teammate/agent mode utilities |
| `forkedAgent.ts`| Forked agent process management |
| `agentContext.ts`| Agent execution context |
### Performance & Diagnostics
| File/Dir | Purpose |
|-----------------|------------------------------------------------|
| `startupProfiler.ts` | Startup performance monitoring |
| `headlessProfiler.ts`| Runtime profiling |
| `fpsTracker.ts` | Frame rate metrics |
| `diagLogs.ts` | Diagnostic logging (PII-free) |
| `debug.ts` | Debug utilities |
### UI Helpers
| File/Dir | Purpose |
|-----------------|------------------------------------------------|
| `theme.ts` | Theme management |
| `renderOptions.ts` | Ink rendering configuration |
| `format.ts` | Number/duration formatting |
| `markdown.ts` | Markdown processing |
| `cliHighlight.ts` | Syntax highlighting for CLI |
---
## 13. Special Modes
### 13.1 Bridge Mode (`src/bridge/`)
Always-on connection to Claude.ai via WebSocket-based session ingress. Enables persistent background sessions and remote access.
### 13.2 Kairos / Assistant Mode (`src/assistant/`)
Enterprise assistant features:
- Background task handling
- Push notifications
- GitHub webhook subscriptions
- Remote task monitoring
- Feature-gated via `KAIROS` flag
### 13.3 Coordinator Mode (`src/coordinator/`)
Multi-agent orchestration:
- Task panel management
- Agent interaction coordination
- Feature-gated via `COORDINATOR_MODE` flag
### 13.4 Voice Mode (`src/voice/`)
Voice input/output support:
- Speech-to-Text (STT) integration
- Text-to-speech
- Voice transcription
- Voice keyterms detection
### 13.5 Plan Mode
Read-only mode for designing implementation strategies:
- Creates plan files in `.claude/plans/`
- Restricts tools to read-only operations
- Requires explicit user approval before execution
- Managed by `EnterPlanModeTool` / `ExitPlanModeTool`
### 13.6 Worktree Mode
Git worktree isolation for safe experimentation:
- Creates temporary git worktrees
- Supports tmux session management
- Temporary branch creation
- Changes can be merged or discarded
### 13.7 Vim Mode (`src/vim/`)
Vim keybinding integration for the terminal input.
---
## 14. Plugins & Skills
### Plugin System (`src/plugins/`)
- **Bundled plugins** in `plugins/bundled/` (keyboard shortcuts, themes, etc.)
- Plugin lifecycle management via `PluginInstallationManager`
- CLI commands for plugin management
- Hot-reload support via `reload-plugins` command
### Skill System (`src/skills/`)
- **Bundled skills** in `skills/bundled/` (commit, review, simplify, etc.)
- Skills are named prompts that can be invoked via `/skill-name`
- Skill discovery and execution engine
- Change detection for live updates
---
## 15. Hooks & Extensibility
### Hook Schema (`src/schemas/hooks.ts`)
Defined via Zod validation:
- `HookEvent` — pre-/post-execution lifecycle hooks
- `PromptRequest` / `PromptResponse` — user prompting protocol
- Sync and async hook response schemas
- Permission decision hooks
### React Hooks (`src/hooks/`)
| Hook | Purpose |
|---------------------|--------------------------------------------|
| `useSettings` | Settings change detection |
| `useTerminalSize` | Terminal dimension tracking |
| `useExitOnCtrlC` | Signal handling |
| `useBlink` | Cursor blinking animation |
| `useDoublePress` | Double-keypress detection |
| `useCanUseTool` | Tool permission validation |
### Utility Hooks (`src/utils/hooks/`)
Additional hooks for shell config, permission state, and tool behavior.
---
## 16. File Statistics
| Category | Count |
|-----------------------------|---------|
| **Total TypeScript files** | 1,884 |
| **Command modules** | 101 |
| **Tool implementations** | 41 |
| **UI components** | 130+ |
| **Utility files** | 300+ |
| **Service modules** | 35+ |
| **Top-level source files** | 18 |
| **Entry points** | 6 |
| **Subdirectories in `src/`**| 37 |
---
## 17. Architectural Patterns
### Lazy Loading & Dead Code Elimination
Conditional imports via `require()` gated by Bun's `feature()` flags. This enables tree-shaking of entire subsystems (e.g., `KAIROS`, `COORDINATOR_MODE`) at bundle time.
```typescript
const assistantModule = feature('KAIROS')
? require('./assistant/index.js')
: null;
```
### Tool-Based Execution Model
Every interaction with the external world goes through a registered `Tool`. Tools have:
- Declarative JSON Schema inputs
- Permission checks before execution
- Progress reporting during execution
- Structured result output
### Command Pattern
Slash commands are modular directories, each exporting a `Command` object. The registry in `commands.ts` aggregates them with optional feature-gate conditions.
### Message-Driven Architecture
The conversation is a sequence of typed messages (`UserMessage`, `AssistantMessage`, `SystemMessage`, `ProgressMessage`, etc.) managed by the `QueryEngine`. Tool results are injected as `ToolResultBlockParam` messages.
### Context Compaction
When conversation context approaches the model's window limit, the system automatically compacts older messages while preserving essential context. Multiple strategies are available: full compaction, micro-compaction (selective pruning), and session memory persistence.
### Permission-First Security
Every tool execution passes through a permission check. Modes include:
- **Ask** — prompt user for each action
- **Auto-allow** — allow with trust rules
- **Deny** — block specific operations
- **Filesystem sandboxing** — restrict file access to project directories
### React Terminal UI
The entire UI is a React component tree rendered via Ink. This enables:
- Declarative UI updates
- Component composition and reuse
- State-driven rendering
- Hooks for terminal-specific behaviors (cursor, resize, keyboard)
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## Contributing
Contributions are welcome! If you've discovered additional architectural details, found inaccuracies, or want to expand coverage of a specific subsystem:
1. **Fork** this repository
2. **Create a branch** for your changes (`git checkout -b fix/tool-system-details`)
3. **Submit a pull request** with a clear description of what you added or corrected
Please keep contributions factual and technically precise. This is a reference document — speculation should be clearly marked as such.
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> **Disclaimer:** This is an unofficial, independent analysis. Claude Code is a product of [Anthropic](https://www.anthropic.com/). All trademarks belong to their respective owners.
*Generated on 2025-03-31. Based on analysis of the Claude Code source tree.*