67 lines
3.5 KiB
Markdown
67 lines
3.5 KiB
Markdown
# Claude Code CLI — Agent Instructions
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## What This Is
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This is the **leaked source code** of Anthropic's Claude Code CLI (leaked 2026-03-31). It is a read-only reference codebase — there is no build system, no tests, and no package.json included. Treat it as a study/exploration resource.
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- **Language**: TypeScript / TSX
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- **Runtime**: Bun (not Node.js)
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- **Terminal UI**: React + Ink (React for CLI)
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- **Scale**: ~1,900 files, 512,000+ lines across `src/`
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## Architecture
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### Core Pipeline
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1. **Entrypoint** — `src/main.tsx`: Commander.js CLI parser, service initialization, lazy feature loading via Bun feature flags
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2. **Query Engine** — `src/QueryEngine.ts` (~46K lines): LLM API call handler — streaming, tool loops, thinking mode, retries, token counting
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3. **Tool System** — `src/Tool.ts` (~29K lines) + `src/tools/`: ~50 tools (BashTool, FileEditTool, AgentTool, etc.), each self-contained with input schema, permissions, and execution logic
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4. **Command System** — `src/commands.ts` (~25K lines) + `src/commands/`: ~50 slash commands (`/commit`, `/review`, `/config`, etc.)
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5. **Context** — `src/context.ts`: Collects OS, shell, git, and user context for prompt construction
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### Key Subsystems
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| Directory | Purpose |
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|-----------|---------|
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| `src/bridge/` | IDE integration layer (VS Code, JetBrains) — bidirectional messaging, JWT auth, session management |
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| `src/coordinator/` | Multi-agent orchestration |
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| `src/services/` | External integrations — Anthropic API, MCP, OAuth, LSP, analytics, plugins |
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| `src/hooks/` | React hooks including `toolPermission/` for per-tool permission checks |
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| `src/components/` | ~140 Ink UI components |
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| `src/plugins/` | Plugin system |
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| `src/skills/` | Skill system |
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| `src/tasks/` | Task management |
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| `src/types/` | Centralized TypeScript type definitions |
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| `src/utils/` | Shared utilities |
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| `src/schemas/` | Zod-based config schemas |
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| `src/memdir/` | Persistent memory directory |
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| `src/voice/` | Voice input |
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| `src/vim/` | Vim mode |
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| `src/buddy/` | Companion sprite (Easter egg) |
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### Feature Flags (Dead Code Elimination)
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Bun strips inactive code at build time via `import { feature } from 'bun:bundle'`. Notable flags: `PROACTIVE`, `KAIROS`, `BRIDGE_MODE`, `DAEMON`, `VOICE_MODE`, `AGENT_TRIGGERS`, `MONITOR_TOOL`, `COORDINATOR_MODE`.
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## Code Style & Conventions
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- **Imports**: ESM with explicit `.js` extensions (e.g., `from './commands.js'`)
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- **Files/Dirs**: kebab-case (`commit-push-pr.ts`, `add-dir/`)
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- **Classes/Components**: PascalCase (`BashTool`, `QueryEngine`)
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- **Functions**: camelCase (`getCommands()`, `getAllTools()`)
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- **Constants**: UPPER_SNAKE_CASE (`ALLOWED_TOOLS`, `FRAME_INTERVAL_MS`)
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- **Linter**: Biome (not ESLint). Look for `biome-ignore` directives
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- **Ant-only code**: Some imports/features are gated behind `process.env.USER_TYPE === 'ant'` (Anthropic internal)
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- **Index pattern**: Features export via `index.ts` files
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## Navigation Tips
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- **Find a tool**: Look in `src/tools/<ToolName>/` — each tool is a directory with its implementation, UI, and permissions co-located
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- **Find a command**: Look in `src/commands/<command-name>/` or `src/commands/<command-name>.ts`
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- **Understand permissions**: Start at `src/hooks/toolPermission/`
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- **Trace an API call**: Start at `src/QueryEngine.ts` → `src/services/api/`
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- **Understand types**: Centralized in `src/types/`, tool-specific types in `src/Tool.ts`
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- **Follow the bridge**: IDE integration starts at `src/bridge/bridgeMain.ts`
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- **MCP integration**: `src/services/mcp/`
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