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Project Motivation and Principles

· 6 min read

As early as the day after Claude Code was released (2025-02-25), I began and completed a reverse engineering attempt of the project. At that time, using Claude Code required registering for an Anthropic account, applying for a waitlist, and waiting for approval. However, due to well-known reasons, Anthropic blocks users from mainland China, making it impossible for me to use the service through normal means. Based on known information, I discovered the following:

  1. Claude Code is installed via npm, so it's very likely developed with Node.js.
  2. Node.js offers various debugging methods: simple console.log usage, launching with --inspect to hook into Chrome DevTools, or even debugging obfuscated code using d8.

My goal was to use Claude Code without an Anthropic account. I didn't need the full source code—just a way to intercept and reroute requests made by Claude Code to Anthropic's models to my own custom endpoint. So I started the reverse engineering process:

  1. First, install Claude Code: