learn-claude-code: '0-to-1 Agent Harness Engineering' Tutorial Reaches 53.6K Stars — Teaching How Claude Code Actually Works Under the Hood

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shareAI-lab's learn-claude-code repository has surged to 53,651 stars by deconstructing Claude Code's architecture into 12 progressive sessions, from a simple agent loop to isolated autonomous execution. The key thesis — 'Bash is all you need' — demonstrates that Claude Code is fundamentally one agent loop plus tools (bash, read, write, edit, glob, grep) plus on-demand skill loading plus context compression. For builders, this is the most starred educational resource on harness engineering, the discipline of building the environment around an LLM rather than the LLM itself.