The original title is "Rebuild It to Understand It: From Network Protocols to LLM Agents"

Short summary

The author argues you only truly understand a system by rebuilding it from scratch, drawing on personal experience recoding TCP, DNS, and Modbus protocols. They apply the same principle to LLMs: an agent is just a loop that sends messages, runs tools, and feeds results back. Building a tiny version demystifies the context window, tooling, and the agent loop, turning passive users into engineers.

• •Rebuilding systems from scratch is the most reliable path to deep understanding
• •Author recoded TCP, DNS, and Modbus in Go, each time gaining practical mastery
• •LLM agents are no different: build a minimal loop to understand context windows and tool use

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