@anthropic-ai/claude-code version 2.1.88. The source is provided strictly for technical research and educational purposes.
What Claude Code is
Claude Code is a terminal-native AI agent. You give it a prompt — or open an interactive session — and it uses a built-in tool system to read files, run shell commands, search codebases, call external APIs, and write changes back to disk. Everything runs locally, coordinated by the agent loop inquery.ts.
The compiled CLI ships as a single 12 MB cli.js bundle requiring only Node.js >= 18. The src/ directory in this repository contains the unbundled TypeScript source extracted from the npm tarball.
Repository stats
| Item | Count |
|---|---|
Source files (.ts / .tsx) | ~1,884 |
| Lines of code | ~512,664 |
| Largest single file | query.ts (~785 KB) |
| Built-in tools | 40+ |
| Slash commands | 80+ |
| npm dependencies | ~192 packages |
| Runtime | Node.js >= 18 (compiled Bun bundle) |
Major capabilities
Agent loop
A
while-loop that calls the Claude API, checks stop_reason, executes tools, appends results, and repeats — wrapped with streaming, compaction, and permission checks.40+ built-in tools
File read/write/edit, glob, grep, bash execution, web fetch, web search, MCP protocol, sub-agent spawning, todo management, and more.
80+ slash commands
In-session commands for authentication, memory, configuration, MCP servers, context compaction, plan mode, session resumption, and code review.
Multi-agent system
Spawn sub-agents as child processes or in-process teammates. Coordinate work via a shared task board and message inbox.
MCP integration
Connect to external MCP servers over stdio, SSE, HTTP, or WebSocket. Tools are registered dynamically under the
mcp__<server>__<tool> naming convention.Session persistence
Every conversation is appended to a JSONL transcript under
~/.claude/projects/. Resume any session with --continue or --resume <id>.Permission model
Three-layer authorization: pre-tool hooks → allow/deny rules → interactive prompt. Each tool reports whether it is read-only, destructive, or concurrency-safe.
Context management
Three compression strategies —
autoCompact, snipCompact, and contextCollapse — keep long sessions within the model’s context window.Repository purpose
This repository contains the decompiled TypeScript source of@anthropic-ai/claude-code v2.1.88, published to npm as a 12 MB bundled cli.js. The src/ directory was extracted from the npm tarball for research purposes.
The source is not directly compilable from this repository alone. 108 feature-gated internal modules were dead-code-eliminated by Bun at Anthropic’s build time and are not recoverable from any published artifact. See Installation for what is and isn’t possible when building from source.
The repository also includes deep analysis reports covering telemetry, hidden features, undercover mode, remote control mechanisms, and the future roadmap derived from reading the source.