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A walkthrough of building an AI coding agent from scratch using CodeCrafters' challenge platform. The tutorial demonstrates how to create a Claude Code-like assistant by implementing tool calling, agent loops, and file system operations. Starting with basic LLM API communication, it progresses through advertising tools to the model, executing tool calls like file reading, and implementing an agent loop that allows the AI to think, act, and observe results iteratively. The implementation uses Go and the OpenAI SDK, showing how agentic tools work under the hood through practical, stage-by-stage development.