Free open-source course: build a Claude Code clone from scratch across 8 articles and 6 videos
blaizedsouza · x · 2026-11-11
A free, open-source course on building a coding agent from scratch: 8 in-depth articles, 6 video lessons, and a complete codebase (1.2k stars on GitHub). After studying the internals of Claude Code, OpenCode, Pi, and Aider, the author argues the agent loop is the easy part — the real engineering is the harness: context management, sandboxing, permissions, memory, tool execution, and evals. The 8-step roadmap covers harness architecture, the agent loop, Docker/Modal sandboxing, and more, culminating in a fully functional Claude Code clone.
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