$ show tanbiralam/claude-code
This is a leaked internal source of 'Claude Code', a terminal-based AI coding assistant CLI built by Anthropic. The application is a monolith written in TypeScript with React/Ink for terminal UIs, running on the Bun runtime. In production, it provides an interactive REPL that connects to Claude LLMs to perform software engineering tasks: reading/writing files, executing bash/PowerShell commands, searching code with grep/glob, managing git operations, spawning sub-agents, running MCP servers, and more. It features a sophisticated permission engine, plugin ecosystem, skill system, IDE bridge (VS Code/JetBrains), and remote session support. The architecture is centered around a QueryEngine that orchestrates LLM API calls with streaming, tool loops, and retries. There are ~40+ tools (BashTool, FileEditTool, MCPTool, etc.) and ~50+ slash commands (/commit, /review, /config, /doctor). The codebase is extremely large (~1900 files, 512K+ lines) with significant internal complexity. However, it contains many stubs for removed internal packages (@ant/*, @anthropic-ai/mcpb, etc.), heavy use of bun:bundle feature flags, and countless ant-only conditionals (process.env.USER_TYPE === 'ant') that gate internal-only features. This means the source cannot be run as-is without Anthropic's infrastructure. While the engineering quality is high in places (clean TypeScript with Zod schemas, well-structured tool pipelines, a custom Ink renderer with Yoga layout), the codebase is not designed for external reuse or portability. It requires Bun, has many hardcoded internal service URLs, and the stubbed packages would need real implementations. For learning and inspiration, however, it offers excellent examples of: terminal UI architecture, permission engines, plugin systems, and AI agent tool frameworks.
The LLM identified 5 files worth highlighting for reuse:
A generic circular buffer (ring buffer) with LRU eviction behavior. Implements push(), get(), clear(), and iteration. Has zero internal dependencies and can be extracted into any TypeScript project. Demonstrates proper handling of buffer wraparound and offers a clean API for fixed-size rolling windows.
An async iterable that provides a single-consumer stream with backpressure. The producer pushes values via a method and the consumer iterates with 'for await'. The stream properly handles completion, errors, and prevents multiple consumers. This is a well-implemented async primitive that could be used in any Node.js/Bun project for signal processing or event streams.
A utility for deferring Zod schema construction to avoid circular dependency issues at module load time. Provides 'lazySchema' which takes a factory function, returning a memoized promise. The schema is built on first access and cached. This pattern is valuable for any application using runtime schema validation with complex type dependencies.
A state machine that gates writes during an initialization flush phase. It queues writes while the gate is 'flushing', then unblocks them. After initialization, writes pass through immediately. Handles edge cases (gate closed after flush). Clean, testable pattern for any system that needs to buffer early writes until a resource is ready.
A generic memoization utility with configurable cache size and TTL. Uses a Map with LRU eviction when cache exceeds limit. Supports cache invalidation (clear, delete). Has zero internal dependencies and provides a better default than lodash's memoize for projects that need cache limits or TTL. Demonstrates proper key serialization and cache management.