‘How Claude Code Works’ by Anthropic

Official Documentation by Anthropic: How Claude Code works - Claude Code Docs

Agentic Loop

3 Phases of Agentic Loop

1. Gather context
2. Take action
3. Verify results

Claude Code = Agentic harness around Claude

1. models: reason
2. tools: act

5 categories of built-in tools.

1. File operations
2. Search
3. Execution
4. Web
5. Code Intelligence (requires plugins)

Extend by skills, MCP, hooks, and subagents.

Useful Commands

Resume or fork sessions

• claude --continue or claude --resume
  • full conversation history is restored, but session-scoped permissions should be reapproved.
• claude --continue --fork-session

The context window

• /compact: control what’s preserved during compaction
  • e.g., /compact focus on the API changes
• /context: see what’s using space
• /mcp: check per-server costs

’Claude Code 내부 아키텍처 분석’ by aldente0630

Blog post by aldente0630 @ AWS

• Claude Code 내부 아키텍처 분석
• Also one of the authors of 『데이터 과학자 원칙』

개인적인 인상

• 비용 절감.
• 체감 대기시간 감소.
• 상호작용 컨트롤.
• 무한루프 방지.

관련 포스팅

• With Animation: Claude Code Unpacked
• As Textbook: Claude Code from Source — Architecture, Patterns & Internals
  • Prompt: Turn Any Codebase Into a Technical Book
• As Documentation: 별첨 91. 클로드 코드 소스 코드 분석서 - 클로드 코드 가이드
• Blog Post: Claude Code’s Entire Source Code Got Leaked via a Sourcemap in npm, Let’s Talk About it
• Blog Post: Everyone Analyzed Claude Code’s Features. Nobody Analyzed Its Architecture. | by Han HELOIR YAN, Ph…