AI BriefingAnalyzing How Claude Code Works Internally
Key point
Anthropic's Claude Code source code was reverse-engineered to analyze its tool-calling and worktree management mechanisms.
Details
Through the source map (.map) files included in the Claude Code package that Anthropic distributed on npm, approximately 510,000 lines of TypeScript source code have been reverse-engineered. This reveals the internal architecture of the top-tier AI coding agent, showing how it organizes context, calls tools, and manages multi-agents.
The key tools and features are as follows:
- EnterWorktree Tool: Creates an isolated git worktree and switches the current session's working directory to that worktree. It is strictly restricted to run only when the user explicitly requests a "worktree".
- AskUserQuestion Tool: Asks the user multiple-choice questions to gather information or assist decision-making. It can leverage the
previewfield to visually present results such as code snippets or diagrams in a side-by-side layout. - LSP Tool: Supports code analysis capabilities by performing code intelligence operations such as
goToDefinition,findReferences, andhovervia the Language Server Protocol (LSP).
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